A theory for In Situ stresses in isotropic and transverseley isotropic rock

Sheorey, P.R.

doi:10.1016/0148-9062(94)92312-4

Cited by 267 publications

(109 citation statements)

References 5 publications

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“…For comparison, the calculated k ratio, Eq. (5) from Sheorey (1994), and the initial k ratio from the model of Alberta, are plotted vs. depth. Material properties are adjusted for the initial model only until good agreement is obtained.…”

Section: Initial Stress Statementioning

confidence: 99%

3-D geomechanical–numerical model of the contemporary crustal stress state in the Alberta Basin (Canada)

Reiter

Heidbach

2014

Solid Earth

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Abstract. In the context of examining the potential usage of safe and sustainable geothermal energy in the Alberta Basin, whether in deep sediments or crystalline rock, the understanding of the in situ stress state is crucial. It is a key challenge to estimate the 3-D stress state at an arbitrarily chosen point in the crust, based on sparsely distributed in situ stress data.To address this challenge, we present a large-scale 3-D geomechanical-numerical model (700 km×1200 km×80 km) from a large portion of the Alberta Basin, to provide a 3-D continuous quantification of the contemporary stress orientations and stress magnitudes. To calibrate the model, we use a large database of in situ stress orientation (321 S Hmax ) as well as stress magnitude data (981 S V , 1720 S hmin and 2 (+11) S Hmax ) from the Alberta Basin. To find the best-fit model, we vary the material properties and primarily the displacement boundary conditions of the model. This study focusses in detail on the statistical calibration procedure, because of the large amount of available data, the diversity of data types, and the importance of the order of data tests.The best-fit model provides the total 3-D stress tensor for nearly the whole Alberta Basin, and allows estimation of stress orientation and stress magnitudes in advance of any well. First-order implications for the well design and configuration of enhanced geothermal systems are revealed. Systematic deviations of the modelled stress from the in situ data are found for stress orientations in the Peace River and the Bow Island Arch as well as for leak-off test magnitudes.

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Section: Initial Stress Statementioning

confidence: 99%

3-D geomechanical–numerical model of the contemporary crustal stress state in the Alberta Basin (Canada)

Reiter

Heidbach

2014

Solid Earth

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“…Mining Induced stresses are dynamic and influenced by the different stages of underground coal mining activity whereas; in-situ stresses are static in nature [5][6][7]. Stability and caving behaviour of strata at the time of depillaring is controlled by mining induced stresses.…”

Section: Introductionmentioning

confidence: 99%

Strata control monitoring in a contiguous seam depillaring working

K¹,

Galav²,

Behera³

et al. 2016

Proceedings of the Conference on Recent Advances in Rock Engineering (RARE 2016)

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-Most of the underground coal mines in the Indian Geo-mining conditions are developed and depillared by Bord and Pillar method. Caving behaviour and strata control are the major concerns to be considered while extraction of coal seams in such workings. This paper describes the results of a scientific strata control monitoring study during depillaring in a contiguous seam working. It includes instrumentation for determining the induced stresses in the pillars and roof-floor convergence in the galleries and junctions with distance from the goaf edges in the working. The mining induced stresses on the pillars were observed to be more in the top seam than that in the bottom seam working. Convergence monitoring was done with Telescopic Convergence Indicators (TCI) and Remote convergence recorders. In general, higher convergence was observed in the junctions as compared to the galleries. The junctions located at distant location suffered more convergence than the galleries is nearer to the goaf edge. Based on the field observation, convergence classification has also been done in terms of average distance of the goaf edge from the point of observation to assess the state of 'No-convergence', 'Initial convergence' and 'Maximum convergence'. The convergence observed in the bottom seam is more than that of the top seam.

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“…Both the soil and the stratified rock masses show the nature of anisotropy. For this reason, theoretical or numerical models should be able to simulate this kind of layered soils and rocks as cross-anisotropic medium (Amadei et al, 1988;Barden, 1963;Gibson, 1974;Lee & Yang, 1998;Sekowski, 1986;Sheorey, 1994). In this paper, the soil mass is modelled as a linearly elastic medium with cross-anisotropic properties.…”

Section: Introductionmentioning

confidence: 99%