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In-situ stress determination — an appraisal of its significance in rock mechanics
100A fracturing, breakouts and from fault plane solutions have been used. Stresses obtained by these methods show detailed stress fields of the regions concerned. From these stress data, models of local stress changes are derived. Auth.
873119 On virgin stress state of a rock mass in mobile folded areas
Aytmatov, I T Proc International Symposium on Rock Stress and Rock Stress Measurement, Stockholm, 1-3 Sept 1986 P55-59. Publ Lulea: Centek,1986 Virgin stress of rock masses of folded areas is a result of tectonomagnetic history of a region. A comparison of stress measurement data obtained by various workers in different folded areas of the world shows close agreement with the data obtained from mountain areas of Tian-Shan and Pamir.
873120 Changes of ground stresses with depth in the Canadian Shield
Herget, G Proc International Symposium on Rock Stress and Rock Stress Measurement, Stockholm, 1-3 Sept 1986 P61-68. Publ Lulea: Centek,1986 Data compiled during the analysis of 54 ground stress tensors in the Canadian shield indicate clearly that near the surface, horizontal stress components exceed the stress values derived from overburden load. The curves presented should be considered as an attempt to consolidate the results from ground stress determinations.
873121 Twenty years of experience on in-situ stress measurements in China
Li Guangqu; Bai Shiwei; Liu Jiguang Proc International Symposium on Rock Stress and Rock Stress Measurement, Stockholm, 1-3 Sept 1986 P79-88. Publ Lulea: Centek,1986 Typical results of in situ stress measurements by overcoring tests during the last two decades are introduced. The cases can be divided into three types: in situ stress in lower strength rocks, in situ stress in higher strength rocks, and in situ stress in high stress regions. The relationship between natural stress and Young's Moduli of rocks and the influence of natural stresses on rock engineering are discussed.
873123
Stresses and tectonics of the upper continental crust - a review Rummel, F Proc International Symposium on Rock Stress and Rock Stress Measurement, Stockholm, 1-3 Sept 1986 P177-186. Publ Lulea: Centek,1986 The present knowledge of acting tectonic stresses is reviewed, including both the constraints imposed by experimental rock mechanics as well as existing in situ stress data from deep hydraulic fracturing borehole profiles. The in situ data show that the maximum crustal shear stresses are given by the two horizontal principal stresses, which favours strike-slip faulting on existing crustal fracture zones. Creep of granitic rocks sets an upper limit on high shear stresses. The peak shear stress seems to exist within the upper 10kin and may be determined by future deep measurements. Extrapolation and comparison of measured crustal stresses with crustal strength limits demonstrate that all faulting modes require extremely high pore pressures, far above hydrostatic, to reduce the effective normal stress on existing fractures. Auth. 873124 Critical examination of basic concepts associated with the existence and measurement of in situ stress
Hyett, A J; Dyke, C G; Hudson, J A Proc International Symposium on Rock Stress and Rock Stress Measurement, Stockholm, 1-3 Sept 1986 P387-396. Publ Lulea: Centek,1986 The stress state in a rock mass is a function of both the present tectonic regime and the stress history. Mechanical and geometrical factors must also be considered. Residual stresses are discussed and a glossary of terms is presented. The effect of measurement scale and the consequence of stress field superimposition are highlighted. The ramifications for interpreting measured stress fields and establishing the appropriate boundary conditions for design are included. Auth.
Measurement of in situ stress 873125 In-situ stress determination - an appraisal of its significance in rock mechanics
Fairhurst, C Proc International Symposium on Rock Stress and Rock Stress Measurement, Stockholm, 1-3 Sept 1986 P3-17. Publ Lulea: Centek,1986 The inherent difficulties of interpreting in situ stress determination are commented on. These difficulties arise primarily from geological complexity and the localized significance of individual measurements.
873122 Influence of rock fabric on gravity-induced stresses
873126
Savage, W Z; Amadei, B P; Swolfs, H S Proc International Symposium on Rock Stress and Rock Stress Measurement, Stockholm, 1-3 Sept 1986 P99-110. Publ Lulea: Centek,1986
In situ measurements, stress state in the upper crust and their application to rock engineering
Four models for the stress distributions induced by gravity in anisotropic, stratified and regularly jointed rock masses are presented. These rocks are assumed to be laterally restrained. It is shown that the nature of the stress field induced by gravity is strongly affected by rock mass structure. It is also found that a decrease in rock mass anisotropy and a stiffening of rock masses with depth can generate stress distributions comparable to empirical distributions proposed in the literature. Auth.
Fangquan Li Proc International Symposium on Rock Stress and Rock Stress Measurement, Stockholm, 1-3 Sept 1986 P69-77. Publ Lulea: Centek,1986 In situ stress measurement is one of the important methods for studying the recent tectonic stress field and the stress state in the upper crust. Based on data of in situ stress measurements, the characteristics of recent tectonic stress fields within China and the stress state in the upper crust are analysed. The stress measurements and their application to rock engineering are also discussed. Auth.
© 1987 Pergamon Journals Ltd. Reproduction not permitted
873119 On virgin stress state of a rock mass in mobile folded areas
Aytmatov, I T Proc International Symposium on Rock Stress and Rock Stress Measurement, Stockholm, 1-3 Sept 1986 P55-59. Publ Lulea: Centek,1986 Virgin stress of rock masses of folded areas is a result of tectonomagnetic history of a region. A comparison of stress measurement data obtained by various workers in different folded areas of the world shows close agreement with the data obtained from mountain areas of Tian-Shan and Pamir.
873120 Changes of ground stresses with depth in the Canadian Shield
Herget, G Proc International Symposium on Rock Stress and Rock Stress Measurement, Stockholm, 1-3 Sept 1986 P61-68. Publ Lulea: Centek,1986 Data compiled during the analysis of 54 ground stress tensors in the Canadian shield indicate clearly that near the surface, horizontal stress components exceed the stress values derived from overburden load. The curves presented should be considered as an attempt to consolidate the results from ground stress determinations.
873121 Twenty years of experience on in-situ stress measurements in China
Li Guangqu; Bai Shiwei; Liu Jiguang Proc International Symposium on Rock Stress and Rock Stress Measurement, Stockholm, 1-3 Sept 1986 P79-88. Publ Lulea: Centek,1986 Typical results of in situ stress measurements by overcoring tests during the last two decades are introduced. The cases can be divided into three types: in situ stress in lower strength rocks, in situ stress in higher strength rocks, and in situ stress in high stress regions. The relationship between natural stress and Young's Moduli of rocks and the influence of natural stresses on rock engineering are discussed.
873123
Stresses and tectonics of the upper continental crust - a review Rummel, F Proc International Symposium on Rock Stress and Rock Stress Measurement, Stockholm, 1-3 Sept 1986 P177-186. Publ Lulea: Centek,1986 The present knowledge of acting tectonic stresses is reviewed, including both the constraints imposed by experimental rock mechanics as well as existing in situ stress data from deep hydraulic fracturing borehole profiles. The in situ data show that the maximum crustal shear stresses are given by the two horizontal principal stresses, which favours strike-slip faulting on existing crustal fracture zones. Creep of granitic rocks sets an upper limit on high shear stresses. The peak shear stress seems to exist within the upper 10kin and may be determined by future deep measurements. Extrapolation and comparison of measured crustal stresses with crustal strength limits demonstrate that all faulting modes require extremely high pore pressures, far above hydrostatic, to reduce the effective normal stress on existing fractures. Auth. 873124 Critical examination of basic concepts associated with the existence and measurement of in situ stress
Hyett, A J; Dyke, C G; Hudson, J A Proc International Symposium on Rock Stress and Rock Stress Measurement, Stockholm, 1-3 Sept 1986 P387-396. Publ Lulea: Centek,1986 The stress state in a rock mass is a function of both the present tectonic regime and the stress history. Mechanical and geometrical factors must also be considered. Residual stresses are discussed and a glossary of terms is presented. The effect of measurement scale and the consequence of stress field superimposition are highlighted. The ramifications for interpreting measured stress fields and establishing the appropriate boundary conditions for design are included. Auth.
Measurement of in situ stress 873125 In-situ stress determination - an appraisal of its significance in rock mechanics
Fairhurst, C Proc International Symposium on Rock Stress and Rock Stress Measurement, Stockholm, 1-3 Sept 1986 P3-17. Publ Lulea: Centek,1986 The inherent difficulties of interpreting in situ stress determination are commented on. These difficulties arise primarily from geological complexity and the localized significance of individual measurements.
873122 Influence of rock fabric on gravity-induced stresses
873126
Savage, W Z; Amadei, B P; Swolfs, H S Proc International Symposium on Rock Stress and Rock Stress Measurement, Stockholm, 1-3 Sept 1986 P99-110. Publ Lulea: Centek,1986
In situ measurements, stress state in the upper crust and their application to rock engineering
Four models for the stress distributions induced by gravity in anisotropic, stratified and regularly jointed rock masses are presented. These rocks are assumed to be laterally restrained. It is shown that the nature of the stress field induced by gravity is strongly affected by rock mass structure. It is also found that a decrease in rock mass anisotropy and a stiffening of rock masses with depth can generate stress distributions comparable to empirical distributions proposed in the literature. Auth.
Fangquan Li Proc International Symposium on Rock Stress and Rock Stress Measurement, Stockholm, 1-3 Sept 1986 P69-77. Publ Lulea: Centek,1986 In situ stress measurement is one of the important methods for studying the recent tectonic stress field and the stress state in the upper crust. Based on data of in situ stress measurements, the characteristics of recent tectonic stress fields within China and the stress state in the upper crust are analysed. The stress measurements and their application to rock engineering are also discussed. Auth.
© 1987 Pergamon Journals Ltd. Reproduction not permitted