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 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 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 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 Scientific and Technical Aerospace Reports written by and published by . This book was released on 1987 with total page 1126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Stress Determination in Rock Using the Kaiser Effect written by Michael J. Friedel and published by . This book was released on 1990 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Journal of Acoustic Emission written by and published by . This book was released on 2000 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research in Progress written by and published by . This book was released on 1978 with total page 834 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of the In situ State of Stress in Soil Masses written by IIT Research Institute and published by . This book was released on 1974 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mass behavior of soil and the loadings imparted to civil engineering works by soil masses are strongly influenced by the naturally existing in-situ soil stresses. The determination of in-situ stresses in soil masses is a difficult problem which, in some cases, requires extensive and subtle evaluation if even an approximate determination is to be made. These studies were conducted to review and assess techniques. Methods for estimating in-situ stress from a knowledge of the soil and assumed stress history, as well as direct measurement methods are identified and described. All known methods for determining in-situ stresses are summarized. Recommendations are made for the development of more sophisticated hardware, transfer and development of fabric analysis technology to soil mechanics, and long range development of magnetic resonance techniques.
Download or read book Handbook of Research on Trends and Digital Advances in Engineering Geology written by Ceryan, Nurcihan and published by IGI Global. This book was released on 2017-07-12 with total page 788 pages. Available in PDF, EPUB and Kindle. Book excerpt: Engineering geologists face the task of addressing geological factors that can affect planning with little time and with few resources. A solution is using the right tools to save time searching for answers and devote attention to making critical engineering decisions. The Handbook of Research on Trends and Digital Advances in Engineering Geology is an essential reference source for the latest research on new trends, technology, and computational methods that can model engineering phenomena automatically. Featuring exhaustive coverage on a broad range of topics and perspectives such as acoustic energy, landslide mapping, and natural hazards, this publication is ideally designed for academic scientists, industry and applied researchers, and policy and decision makers seeking current research on new tools to aid in timely decision-making of critical engineering situations.
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 1997-03-31 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 Acoustic Emission Microseismic Activity written by Jr., H. Reginald Hardy and published by CRC Press. This book was released on 2003-01-01 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of topics related to acoustic emission/microseismic (AE/MS) activity. It covers basic material behaviour, stress wave propagation, transducer design and installation, electronic instrumentation, data acquisition and analysis, and signal processing, as well as practical applications.
Download or read book Determination of Stress and Damage Levels of Rocks Using Acoustic Emission and the Kaiser Effect written by Li Chunlin and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Acoustic Emission microseismic Activity in Geologic Structures and Materials written by Henry Reginald Hardy and published by . This book was released on 1995 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geomechanical Behaviors of Bimrocks written by Wang Yu and published by CRC Press. This book was released on 2021-04-28 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is intended as a reference book for advanced graduate students and research engineers in block-in-matrix rocks (bimrocks) or soil and rock mixtures (SRMs) or rock and soil aggregate (RSA). Bimrocks are complex formations characterized by competent rock inclusions floating in a weaker matrix. Typical types of bimrocks include a series of mixed geological or engineering masses such as mélanges, fault rocks, coarse pyroclastic rocks, breccias, sheared serpentines, and waste dump mixture. Bimrock is especially different from the general soil and rock material, and the detection of the damage and fracture is still wide open to innovative research. Globally, there is a widespread interest in investigating the geomechanical behaviors of bimrocks, such as deformation and strength characteristics, damage and fracture evolution, and stability prediction of bimrock construction. However, the meso-structural factors control the whole mechanical properties of bimrocks; the source of the macroscopic deformation phenomenon is the meso-structural changes. Therefore, evaluation of the mesoscopic physical and mechanical properties, together with advanced testing technique, is an attractive research topic in rock mechanics. As a result, comprehensive macroscopic and mesoscopic experimental investigations should be conducted to reveal the damage and fracturing mechanical behaviors of bimrocks. The readers of this work can gain new insights into the meso-structural changes of bimrocks subjected to different stress paths. This book is expected to improve the understanding of the mesoscopic damage and fracturing mechanisms of bimrocks, and can be helpful to predict the stability of rock structures where rock mass is subjected to complex loading conditions.
Download or read book Journal of Geotechnical Engineering written by and published by . This book was released on 1989 with total page 986 pages. Available in PDF, EPUB and Kindle. Book excerpt:
