Download or read book In Situ Stress Reconstruction Using Rock Memory written by Chung-min Hsieh and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: [Truncated abstract] Knowledge of in situ stress for underground construction or excavations is important. With an input of in situ stress magnitude/orientations, one can predict the potential failure, improve the efficiency of ground support and/or provide the parameters for numerical modelling/planning to make the design cost effective. In this thesis, two rock memory-based in situ stress measurement methods, the acoustic emission method and the Deformation rate analysis method, were studied. The acoustic emission method utilizes the Kaiser effect to recover the previously applied maximum stress, which is expected to be the in situ stress. The phenomenon that Kaiser has found and the usage of the Kaiser effect for the in situ stress measurement were reviewed, and a series of tests in aluminium, agate, sandstone, ultramafic and slate samples with different conditions in the sample end was performed. The result shows that the Kaiser effect method of the in situ stress determination has severe limitations. Firstly, the asperities/irregularities/residual material at the sample ends at low stress can manifest themselves as the Kaiser effect. This 'ghost' Kaiser effect created by the sample ends is not related to the rock memory and it is an artefact of the test preparation. A thin plastic sheet (TML strain gauge) plus silicone gel can be a buffer material to reduce the noise from end. A multichannel source location system could also be able to detect the origin of signal. Secondly, the process of crack generation/growth can create sufficient change in the stress path in the following loading cycle. Because the Kaiser effect is masked by the acoustic emission associated with the damage accumulation, the acoustic emission could start much earlier than the previous maximum stress. In order to prevent the damage accumulation from imitating the Kaiser effect and misleading the analysis, one should find the stress range in which the Kaiser effect can be detected, before using the Kaiser effect as a stress measurement method...
Download or read book In situ Rock Stress written by Michael Tucker and published by CRC Press. This book was released on 2015-10-12 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the new classification of chronic myeloproliferative disorders, and the rise of interest in molecularly targeted therapies, this timely text brings together international experts on the topic to discuss the current technologies and their implications for the treatment of patients. This title comprehensively covers chronic myeloid leukemia and Ph-negative chronic myeloproliferative disorders and is an essential resource for all practitioners in Hematologic Oncology.
Download or read book Rock Stress and Its Measurement written by B. Amadei and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rock masses are initially stressed in their current in situ state of stress and to a lesser natural state. Whether one is interested in the extent on the monitoring of stress change. formation of geological structures (folds, faults, The subject of paleostresses is only briefly intrusions, etc. ), the stability of artificial struc discussed. tures (tunnels, caverns, mines, surface excava The last 30 years have seen a major advance our knowledge and understanding of rock tions, etc. ), or the stability of boreholes, a in the in situ or virgin stress field, stress. A large body of data is now available on knowledge of along with other rock mass properties, is the state of stress in the near surface of the needed in order to predict the response of rock Earth's crust (upper 3-4km of the crust). masses to the disturbance associated with those Various theories have been proposed regarding structures. Stress in rock is usually described the origin of in situ stresses and how gravity, within the context of continuum mechanics. It is tectonics, erosion, lateral straining, rock fabric, defined at a point and is represented by a glaciation and deglaciation, topography, curva second-order Cartesian tensor with six compo ture of the Earth and other active geological nents. Because of its definition, rock stress is an features and processes contribute to the current enigmatic and fictitious quantity creating chal in situ stress field.
Download or read book Rock Anisotropy and the Theory of Stress Measurements written by Bernard Amadei and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt: Any undisturbed rock mass is subject to natural stresses inclu ding gravitational stresses due to the mass of the overburden and possibly tectonic stresses due to the straining of the earth's crust and remanent stresses due to past tectonism. Knowledge of the in situ stress field must be integrated into any rock engineering design along with general rock mass characteristics such as de for mability, strength, permeability and time dependent behavior. For example, the choice of optimum orientation and shape of deep underground caverns or complex underground works will be controlled by the orientation and the magnitude of the in situ stress @ield if it is necessary to minimize stress concentration problems. Long term variation of the in situ stress field may also help to evaluate the potential hazard of earthquake occurences. The magnitude and orientation of the stress field ata point within a rock mass can be measured but there is no known method by which the state of stress at a point can be accurately determined by instruments located remotely. In general, measurements are made inside boreholes, on outcrops or on the internal surfaces of under ground cavities. Most of the measuring techniques intentionally disturb the state of stress in the rock and then measure consequent strains and displacements. Measured strains or displacements are then related to the stresses through assumptions of material behavior. A common procedure is to assume that the rock mass is linearly elastic, isotropic, continuous and homogeneous.
Download or read book Measurement of in situ stress in rock using NQR techniques written by E. Schempp and published by . This book was released on 1982 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rock Stress 03 written by K. Sugawara and published by CRC Press. This book was released on 2020-12-17 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication contains three special lectures, six keynote addresses and sixty-eight technical papers presented at the symposium. The wide variety of topics covered are grouped in the proceedings according to subject.
Download or read book In Situ Rock Stress Measurement Interpretation and Application written by Abhinav Mishra and published by . This book was released on 2015-08 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding in-situ rock stress is important in the exploration and engineering involving rock masses for mining, hydropower, tunneling, oil and gas production, and stone quarrying. Traditional methods of determining these stresses have not developed substantially to keep pace with the increasing utilization of rock masses. Contributed by a group of leading experts, this book addresses new developments in numerical modeling and advanced measuring techniques. In-Situ Rock Stress: Measurement, Interpretation and Application reflect the development in this field, covering measuring techniques, interpretation methods, and application of the in-situ stress in engineering practice. Estimate of the in-situ rock stress state can be realized by direct or indirect methods. Although the indirect method has developed rapidly in recent years, the direct field measurement is still by far dominating. Great improvements have been achieved with the 'traditional' field tests by overcoring and hydraulic fracturing, whilst the recently developed methods become matured. In addition, ideas of new methods and new instruments will make the stress estimate easier, less expensive and more reliable.
Download or read book In Situ Stress Determination in Rock Using the Acoustic Emission Technique written by John Joseph McElroy and published by . This book was released on 1985 with total page 698 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Measurement of In situ Stress in Salt and Rock Using NQR Techniques written by Ellery Frank Schempp and published by . This book was released on 1980 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book In situ Rock Stress written by Ming Lu and published by Taylor & Francis Group. This book was released on 2006 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accompanying CD-ROM includes conference proceedings.
Download or read book The Measurement of in Situ Rock Stress Using the Photoelastic Biaxial Gauge with the Core relief Technique written by Ivor Hawkes and published by . This book was released on 1965 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of in situ stresses within rock masses using the acoustic emission technique written by Amir M. Soltani Ghasemi and published by . This book was released on 1986 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book In situ Characterization of Rocks written by K.R. Saxena and published by CRC Press. This book was released on 2002-01-01 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers compiled in this book cover almost all aspects of in-situ characterization ranging from rock mass classification measurement of in-situ stresses, strength and deformation characteristics to field instrumentation and back analysis of observations made.
Download or read book Interpretation of Underground In situ Stress Measurements in Rock written by Robert A. M. Irvin and published by . This book was released on 1986 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book In situ Stress Determination in Soil and Rock Using the Acoustic Emission Method written by Arthur E. Lord and published by . This book was released on 1984 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: A project was undertaken to determine how well acoustic emission (AE) techniques could be used to determine the existing stress state in rock and soil masses. It was found in rock that the Kaiser Effect (No AE until previous stress level EXCEEDED) was obeyed for short times (delay times) after stress application, but was not obeyed for delay times longer than about 100-1000 hours. In soil, the Kaiser effect was obeyed, but the effect of delay times was not investigated. These results apply to a very wide variety of rock and soil types. A Goodman rock jack was retrofitted with an AE transducer assembly and field tested in large discrete rock masses at a rock quarry and in bore holes in six different sites with varying rock types. This acoustic-rock jack functioned very well above and below the water table. The existing horizontal stresses, predicted from breaks in the AE versus applied stress curves, were of the same order (on the higher end) as those determined by more conventional mthods of determining the existing stress state. A Menard pressuremeter was retrofitted with an AE transducer assembly, and used in bore holes in the field in various soil types. Preliminary field work has shown this acoustic pressuremeter to work well to depths of 10 feet (only used above the water table so far). The existing horizontal (lateral) stresses predicted from the AE pressuremeter results were in the higher portion of the expected values.
Download or read book Measurement of in situ stress in salt and rock using NQR techniques Department of Energy Washington D C written by E. Schempp and published by . This book was released on 1980 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Unconventional Reservoir Geomechanics written by Mark D. Zoback and published by Cambridge University Press. This book was released on 2019-05-16 with total page 495 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive overview of the key geologic, geomechanical and engineering principles that govern the development of unconventional oil and gas reservoirs. Covering hydrocarbon-bearing formations, horizontal drilling, reservoir seismology and environmental impacts, this is an invaluable resource for geologists, geophysicists and reservoir engineers.
