Results 231 to 240 of about 4,217,928 (269)

Modelling the deformation of underground excavations in layered rock masses

International Journal of Rock Mechanics and Mining Sciences, 1997
Abstract Two small-scale models simulating an opening in a flat-lying layered rock mass were manufactured in the laboratory using ilmenite sand and gypsum mixtures and tested on a loading frame until failure. It was observed that the failure of the opening was initiated by tensile cracking at the mid-section of the immediate roof layer.
D ADHIKARY, A DYSKIN
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Research on Shear Failure Criterion for Layered Rock Mass

Advanced Materials Research, 2012
In order to study the stability of layered rock mass, a shear failure criterion for layered rock mass is presented and its program is compiled in C language. The shear failure criterion consists of two parts: firstly, four empirical expressions are suggested in which shear strength parameters vary with the direction; secondly, a pilot calculation ...
Zhi Zeng Zhang, Lan Lan Zhou, Zhen Xia Yuan, Zhong Hua Sun   +3 more
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The “equivalent” anisotropic properties of layered rock and soil masses

Rock Mechanics Felsmechanik Mécanique des Roches, 1972
The cross-anisotropic elastic material “equivalent” to stratified rock or soil is examined, assuming the individual strata to be isotropic. It is shown that there are restrictions on the ranges of permissible variation of some of the five characteristic constants compared with those of a general cross-anisotropic material. Consideration is given to the
L. J. Wardle, C. M. Gerrard
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Numerical modeling of wellbore stability in layered rock masses

Arabian Journal of Geosciences, 2015
Borehole instabilities during drilling are more common in bedding plane rocks than in most other rock formations. Bedding plane rocks make up more than 80 % of rocks in siliciclastic environments, and about three quarters of borehole problems are caused by bedding plane rocks instability.
H. Parsamehr, S. D. Mohammadi, P. Moarefvand   +2 more
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Fracture permeability normal to bedding in layered rock masses

International Journal of Rock Mechanics and Mining Sciences, 2001
Abstract A two-dimensional model of fracture permeability normal to bedding in layered rock with orthogonal, bed-delimited fractures is investigated. Steady-state, saturated laminar flow is assumed. Permeability is assumed to be a function of apertures and flow path lengths in an otherwise impermeable matrix.
D.M. Doolin, M. Mauldon
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Influence of scour on the vertical response of rock‐socketed piles in layered saturated rock–soil mass

International Journal for Numerical and Analytical Methods in Geomechanics, 2022
Abstract The influence of scour on the vertical response of rock‐socketed piles in a layered saturated rock–soil mass is studied through the finite element‐boundary element coupling method. By utilizing the theoretical solution of layered saturated media as the kernel function, the boundary element method (BEM) is used to deduce the ...
Yuan Feng Chen, Zhi Yong Ai, Zhan Guo Ma, Zi Kun Ye   +3 more
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Partitioning of non-coaxiality in deforming layered rock masses

Tectonophysics, 1992
Abstract Partitioning of non-coaxiality and other flow parameters in deforming layered rock masses with nearly incompressible Newtonian rheology is examined in two dimensions by the finite element method. The results show that layers with viscosity contrast in suitable orientation deform by different and even by a reverse sense of non-coaxiality ...
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Finite element analysis of Cosserat Theory for layered rock masses

Computers and Geotechnics, 1993
The excavation problem in a periodically layered plane due to an arbitrary in-situ stress field has been analyzed by the Cosserat finite element approach, using 8-node isoparametric elements. Special emphasis is given to the case when the shear modulus of one type of layer is much smaller than that of the adjacent layers.
Dai, C., Muhlhaus, H., Duncan Fama, M., Meek, J.   +3 more
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An Improved Equivalent Constitutive Model for Layered Rock Mass Considering Layer Structure and the Effect of Asymptotic Deterioration of Deformation and Strength

Computers and Geotechnics
As a kind of widely exposed engineering rock mass, layered rock mass exhibits extremely anisotropy and significant asymptotic deterioration effect in both deformation and strength.
Quan Jiang
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A simplified rock mass-rock bolt interaction analysis for horizontally layered strata

Geotechnical and Geological Engineering, 1991
A ground convergence-support reaction analysis is extended to the case of an opening excavated in horizontally layered strata. Simplifying assumptions include linear elastic behaviour and classical beam theory. The method is used to demonstrate the influence on bolt loads of a number of factors including the timing of support installation, failure of ...
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