Download or read book Field Tests of Levee Construction written by United States. Department of the Army and published by . This book was released on 1967 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Report on Field Tests of Levee Construction written by United States. Department of the Army and published by . This book was released on 1966 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Introduction to Field Investigations and Testing for Levees written by J. Paul Guyer and published by Independently Published. This book was released on 2018-07-04 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication provides introductory technical guidance for civil engineers and other professional engineers and construction managers interested in field investigations and field and laboratory testing of soils for levee construction and maintenance projects. Here is what is discussed: 1. INTRODUCTION, 2. FIELD INVESTIGATIONS, 3. SUBSURFACE EXPLORATION, 4. FIELD TESTING, 5. LABORATORY TESTING

Download or read book An Introduction to Field Investigations and Testing for Levees for Professional Engineers written by J Paul Guyer and published by Independently Published. This book was released on 2023-07-20 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introductory technical guidance for civil engineers and other professional engineers and construction managers interested in planning, design and construction of levees for flood protection and water resources development projects. Here is what is discussed: 1. INTRODUCTION, 2. FIELD INVESTIGATIONS, 3. SUBSURFACE EXPLORATION, 4. FIELD TESTING, 5. LABORATORY TESTING.

Download or read book An Introduction to Field Investigations and Testing for Levees written by J. Paul Guyer, P.E., R.A. and published by Guyer Partners. This book was released on 2017-12-13 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introductory technical guidance for civil and geotechnical engineers interested in field investigations and testing for levees for flood control and other water resources projects. Here is what is discussed: 1. INTRODUCTION 2. FIELD INVESTIGATIONS 3. SUBSURFACE EXPLORATION 4. FIELD TESTING 5. LABORATORY TESTING.

Download or read book Design and Construction of Levees written by and published by . This book was released on 1995 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Introduction to Field Investigations and Testing for Levees for Professional Engineers written by J. Paul Guyer and published by Guyer Partners. This book was released on 2023-07-20 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introductory technical guidance for civil engineers and other professional engineers and construction managers interested in planning, design and construction of levees for flood protection and water resources development projects. Here is what is discussed: 1. INTRODUCTION, 2. FIELD INVESTIGATIONS, 3. SUBSURFACE EXPLORATION, 4. FIELD TESTING, 5. LABORATORY TESTING.

Download or read book Pilot Levee Maintenance Study written by California. Department of Water Resources and published by . This book was released on 1967 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Recent Levee Construction written by Charles R. Suter and published by . This book was released on 1895 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Code for Utilization of Soils Data for Levees written by United States. Mississippi River Commission and published by . This book was released on 1947 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Introduction to Levees for Professional Engineers written by J. Paul Guyer, P.E., R.A. and published by Guyer Partners. This book was released on with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introductory technical guidance for civil engineers and other professional engineers and construction managers interested in design and construction of levees. Here is what is discussed: 1. FIELD INVESTIGATIONS, 2. LEVEE CONSTRUCTION METHODS, 3. SEEPAGE, SLOPE AND SETTLEMENT, 4. BERMS, FILTERS AND DRAINS, 5. SOIL CEMENT FOR PROTECTION OF LEVEES, 6. SPECIAL FEATURES.

Download or read book An Introduction to Levees written by J. Paul Guyer, P.E., R.A. and published by Guyer Partners. This book was released on 2017-12-26 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introductory technical guidance for civil and professional engineers and construction managers interested in design and construction of levees. Here is what is discussed: 1. FIELD INVESTIGATIONS 2. LEVEE CONSTRUCTION METHODS 3. SEEPAGE, SLOPE AND SETTLEMENT 4. BERMS, FILTERS AND DRAINS 5. SOIL CEMENT FOR PROTECTION OF LEVEE 6. SPECIAL FEATURES.

Download or read book Prediction of End Of Construction Undrained Deformations of Atchafalaya Levee Foundation Clays written by Roger Foott and published by . This book was released on 1972 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Levee construction in south-central Louisiana has proven to be very time consuming and expensive because of excessive movements within the soft, highly plastic, thick deposits of the foundation soils. Field measurements from three well instrumented test sections constructed along the East Atchafalaya Basin Protection Levee (EABPL) have led to the belief that undrained shear strains and long term lateral creep deformations are major factors contributing to the very large settlements of the levees. This report presents the results of finite element predictions of the end of construction lateral deformations on the floodwayside of the EABPL Test Sections II and III. The M.I.T. computer program was used for the analysis and realistically modeled the actual sequence of construction.

Download or read book Static and Seismic Performance of California Levees written by Michelle Jennifer Shriro and published by . This book was released on 2014 with total page 667 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study has two main thrusts. The first part of the study addresses static seepage and stability of California levees as related to the presence of woody vegetation. The second part of this study addresses seismic deformations related to California levees through calibration, validation, and sensitivity analysis of a constitutive model implemented to capture seismic embankment deformations. Two field tests were conducted to investigate the effects of seepage in the vicinity of live and decaying tree root systems to examine the effects of live and decaying root systems on levee seepage and slope stability. The first field test involved the construction of parallel trenches in the vicinity of a eucalyptus stump located along the landside of the northern levee bordering the American River adjacent to the California Exposition and State Fair. A live hackberry tree with healthy roots was present at the toe of the levee. A control set of parallel trenches was constructed away from the eucalyptus stump. During the test, the upslope trench was flooded and maintained at constant head to induce slope-parallel seepage and the downslope trench was used to make observations and collect any intercepted seepage. Piezometers and tensiometers were installed to measure positive and negative pore water pressures within the zone of flow to describe the wetting and flow patterns as they evolved within the levee. Instrumentation was installed to assess the influence of the stump and its decomposing root system. Live roots, mammal burrows, and other features added complexity to the system. In addition to instrumentation data, visual observations were recorded during the 6 day flow test. During the flow test, wetting front and water flow patterns appeared to be dominated by flow through a network of shallow mammal burrows. Physical observation of the saturation front, as seen from the lower wall, confirmed that the area below the stump was the last location to saturate during the wetting test. Ground-based tripod light detection and ranging (T-LiDAR) was used to complement traditional logging and for constructing a 3D model of the root system, burrows and stratigraphy. Preliminary computer simulations of the advance of the wetting front support the basic patterns observed in the field test. The second field experiment was conducted along the crown of a bypassed levee along an oxbow segment of the seven mile slough on Twitchell Island in Rio Vista, California. An 8-foot deep crown trench was excavated to extend through the root system of a land side live oak tree, a water side valley oak tree, and a control section. The test was designed to evaluate the effects of seepage in the vicinity of live tree root systems. During the test, the crown trench was flooded and maintained at constant head to simulate a flood condition with water delivered from the center of the levee. Piezometers and tensiometers were installed to measure positive and negative pore water pressures, respectively, within the zone of flow to describe the wetting and flow patterns as they evolved within the levee. Burrow networks, fracturing, and gapping within levee soils, as well as variability of stratigraphic conditions across the site added complexity. Visual observations were made during the flow test to view surficial seepage and flow patterns from the surface in addition to continuous monitoring of subsurface instruments. The site contained an extensive network of muskrat burrows in addition to burrows by other species and the initial advance of the wetting front appeared to be related to burrowing activity. With increased time and saturation of levee soils, flow through macropores appeared to diminish. The levee appears to have been founded on overbank deposits comprised of lower permeability soils than the overlying levee fill. Water appeared to accumulate on this stratigraphic layer, driving seepage patterns on the landside of the levee. A break in this low permeability layer affected flow patterns while the slope of this layer toward this break appears to have added a three dimensional effect to flow patterns. Cracking was observed in the crown road along the levee crest within the first 24 hours of the flow test. After approximately 40 hours of flow, the waterside oak tree, which was initially leaning at an angle of approximately 43 degrees from horizontal, rotated an additional approximately 20 degrees into the slough, creating cracks and deformation along the waterside slope. A dye test was performed as a part of the experiment to better understand the extent of these burrows, their effect on flow patterns, and to better evaluate the role of these burrow networks in the deformations observed on the waterside slope during the flow test. Ground-based tripod light detection and ranging (T-LiDAR) was used to complement our efforts related to tracking deformations during the test. Based on calibrated numerical simulations, trees were found not to play a significant role in seepage-induced rotational or block failure of the levee slopes. However, where trees exhibit significant lean (center of mass extends beyond the fulcrum of the root plate), horizontal roots extending into the levee may place additional loads on the levee embankment. Loading of this type can be incorporated into two dimensional slope stability analyses, using mass-averaging to capture the three-dimensional impact of the tree. Tree overturning was evaluated at the waterside oak tree. Root forces were represented as a single horizontal force and a single vertical force. Horizontally oriented tree root loading increased faster than vertical loading in response to increasing slope angle, while the reverse was true for tree lean where vertical root forces increased more rapidly with increasing tree lean. The method was implemented and successfully captured the observed landside and waterside tree responses during the Crown Trench Seepage Test. The second part of this research focused on seismically induced permanent displacement of earth levees, embankments, and earth-fill slopes resulting from liquefaction below these earth structures. Deformations of this nature are not well captured in current seismic design practice. Ground remediation can be employed to reduce the hazards resulting from soil liquefaction for cases where the analytical tools predict poor seismic performance. There are not sufficient funds to repair all vulnerable levees in the system. Thus, robust analytical procedures are required to evaluate sections of levees where liquefiable foundation materials may lead to significant damage. Inertially driven ground movements of intermediate levels are the primary focus of this study. In these cases, the post-liquefaction static stability of the earth slope is greater than one, and seismically induced permanent displacements result primarily from earthquake shaking after liquefaction is triggered. Limited lateral spreads involving liquefaction of medium dense sand can produce seismic displacements on the order of several centimeters to a meter or more. These levels of seismic displacements are sufficient to damage severely levees. The most commonly employed simplified method for evaluation of seismic deformation at these intermediate levels relies on the concept post-liquefaction residual shear strength. For many practical cases, residual shear strength is ill-defined due to the ever changing resistance provided by soils that undergo repetitive dilative responses during cyclic loading. Where liquefied soils are sufficiently strong to resist flow failures, engineers lack satisfactory tools to evaluate the seismic performance of earth structures that overlie liquefiable soils. A nonlinear soil constitutive model (UBCSAND), which was developed by Professor Byrne and implemented in the finite difference program FLAC, is employed to evaluate seismic deformations of earth structures resulting from liquefaction-induced lateral movements. Analyses of one-element laboratory tests are performed first to develop trends within the UBCSAND soil model calibration parameters. The basic model parameters are correlated to (N1)60 values. The UBCSAND model also has four "fitting" parameters. Two of the four model parameters are varied in this study to evaluate the sensitivity of the results to these variations. Triggering is captured with values of the m_hfac1 parameter with a typical range of 0.5 to 2.0 depending on relative density, CSR, and initial static shear stress. The trends identified are implemented in the back-analysis of several case histories, and the ability of the UBCSAND model within the program FLAC to capture observed deformations is evaluated. The numerical simulations of seismic performance at Moss Landing Marine Laboratory and Monterey Bay Aquarium Research Institute during the 1989 Loma Prieta Earthquake and at the Juvenile Hall Facility during the 1971 San Fernando Earthquake are shown to capture well the key features of these case histories. The study was generalized through a broader sensitivity study to investigate the seismic performance of earthen embankments built atop potentially liquefiable soils. Several representative levee sections on differing foundations are analyzed, wherein key characteristics, such as the thickness of the liquefiable layer and its relative density, are systematically varied to develop useful insights. The thickness of the liquefiable foundation layer impacted displacements in a non-linear pattern where displacement increased more rapidly as the liquefiable material layer thickness increases. As would be expected, combinations of thicker deposits of liquefiable foundation soils combined with higher embankments yielded the maximum displacement of the.

Download or read book Dynamic Shake Testing of a Model Levee on Peaty Organic Soil in the Sacramento San Joaquin Delta written by Edward Thomas Reinert and published by . This book was released on 2014 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Sacramento-San Joaquin Delta is the hub of California's water distribution system, which consists of below sea-level islands surrounded by levees. Delta levees are constructed of local fill, have typically been unengineered and are notorious for breaching, causing flooding of the islands inside. One major concern is the seismic performance of Delta levees, which have not experienced a significant seismic event in over a century. Many of these levees are founded on local peaty organic soils, and the seismic performance of these levees is poorly understood. As part of a collaborative research investigation to study to study the seismic performance of Delta levees, a series of dynamic field tests were performed on a model levee constructed on very soft and compressible peaty organic soils on Sherman Island. This first-of-its-kind test applied dynamic loads to the model levee-peat system using the large NEES@UCLA MK-15 eccentric mass shaker mounted on the levee crest. Two sets of tests were performed in 2011 and 2012. Geotechnical and geophysical investigations performed at the site found a 11m thick peat deposit rests atop permeable Pleistocene sand. The peaty soils consist of 9m of soft saturated peat with a Vs of 30 m/ and a 2m stiff desiccated crust with a Vs of 60 m/s lying atop the soft peat. Artesian pressures exist in the soft saturated peat due to hydraulic connection with the nearby Sacramento River, with a zero effective stress condition existing at the peat-sand interface. Remote data monitoring measured settlement and pore pressure dissipation of the levee using embedded piezometers and a slope inclinometer. The remote monitoring found fast dissipation of pore pressures underneath the levee and continued settlement of the levee due to a high rate of secondary compression. Prior to the 2012 tests, a berm was constructed around the levee and the ground was flooded, to create more realistic soil conditions in the unsaturated crust. Dynamic base shear-displacement and moment-rotation relations were made for the levee. The model levee translated and rotated visibly during testing, demonstrating a response that differs from the one-dimensional wave propagation assumption used to analyze seismic levee response. High radiation damping was observed, and translation of the levee was found to go out-of-phase at peak shaker frequencies. Complex-valued stiffness of the levee-peat system was analyzed and compared to analytical solutions for a rigid foundation on an elastic halfspace. Little agreement was found between the field test results and the analytic solution, suggesting that the levee-peat foundation is flexible. Dynamic shear strains measured underneath the levee crest and toe measured an average value of shear strains at the bottom of the stiff crust and top of the soft peat. Peak shear strains measured during testing went up to 0.4%, with higher shear strains occurring underneath the levee toe, due to the rocking behavior. Comparison of residual pore pressure ratios generated during testing show a trend in increasing residual pore pressure with increasing shear strain. Comparison of field test results with dynamic laboratory testing showed very little increase in residual pore pressures from field tests, suggesting that pore pressures underneath the levee dissipated quickly due to high horizontal permeability. A series of finite element simulations were performed with elastic isotropic materials to compare different hypothetical soil conditions and loading scenarios. Good agreement in shear strains between the field test and the finite element simulations were found. Higher shear strains were found to exist beneath the levee for softer soils and uniform base excitation. A study investigated the development of shear stresses within the levee fill, and found an increase in peak shear stresses compared to shear stresses calculated for a simple shear case. This has implications for liquefaction triggering analysis, and the finite element simulations suggest that the current methodology used in evaluating seismic demand may be underestimating shear stresses within the levee fill.

Download or read book Investigation of Underseepage Lower Mississippi River Levees written by Waterways Experiment Station (U.S.) and published by . This book was released on 1941 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Site Testing at Darrow 16AN54 Marchand to Darrow Levee Enlargement and Concrete Slope Pavement Mississippi River Levees Ascension Parish Louisiana written by and published by . This book was released on 1997 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Darrow site (16AN54), located in the community of Darrow, Ascension Parish, Louisiana, consists of the remains of a portion of the community that was destroyed by a 1932 Mississippi River levee setback. The site encompasses approximately 1.4 acres. NRHP test excavations at the Darrow site consisted of backhoe trenches and three 1m hand excavation units guided by proton magnetometer survey and historic map evidence. Excavations revealed the presence of three distinct midden deposits. The deposits represent an occupation span beginning just after the Civil War and ending just prior to the construction of the new Darrow levee in 1932. Moreover, the two nineteenth century midden deposits seem to be functionally different based on the types of artifacts recovered from them. Also, the presence of intact features at the site was established. These included a linear brick feature and the remains of a razed chimney. Because the Darrow site possesses the quality of integrity as demonstrated by the test excavations, and because it possesses further research potential (Criterion D), it is recommended as being eligible for nomination to the NRHP. It is further recommended that data recovery be undertaken in that portion of the site to be impacted by the proposed levee enlargement and concrete slope pavement construction. This data recovery program would mitigate the adverse impacts to intact deposits located within the area to be impacted by construction.