Deformability characteristics of a rock mass under true-triaxial stress compression

被引：12

作者：

Tiwari R.P. ^{[1
]}

Rao K.S. ^{[2
]}

机构：

[1] Department of Civil Engineering, Rewa Engineering College

[2] Department of Civil Engineering, Indian Institute of Technology, New Delhi 110016, Haus Khas

来源：

Geotechnical & Geological Engineering | 2006年 / 24卷 / 4期

关键词：

Deformability; Intermediate principal stress; Physical modelling; Rock mass; True triaxial;

D O I：

10.1007/s10706-005-4431-5

中图分类号：

学科分类号：

摘要：

In this paper an experimental study was planned on rock mass model with three joint sets under triaxial and true-triaxial stress states to assess the influence of joint geometry and stress ratios on deformational behaviour of rock mass. The physical models were composed of three continuous orthogonal joint sets in which joint set-I was inclined at angle θ=0°, 20°, 40°, 60°, 80° and 90° with ×-axis, joint set-II was produced at staggering s=0.5 and joint set-III was kept always vertical. Thus, rock mass models with medium interlocked smooth joints (φj=36.8°) were simulated under true triaxial compression (σ1 >σ2>σ3). Modulus of rock mass shows anisotropy with joint inclination θ which diminishes with increase in σ2/σ3 ratio. The rock mass at θ=60° shows the highest modulus enhancement (599.9%) whereas it is minimum (32.3%) at θ=90°. Further two empirical expressions for estimation of deformation modulus were suggested based on experimental results, which were developed by incorporating two basic concepts, e.g. Janbu's coefficients and joint factor, Jf. © Springer 2006.

引用

页码：1039 / 1063

页数：24

共 14 条

[1]

Bieniawski Z.T., Determining rock mass deformability: Experience from case histories, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 15, pp. 237-247, (1978)

[2]

Goodman R.E., Introduction to Rock Mechanics, (1989)

[3]

Haimson B., Chang C., A new true triaxial cell for testing mechanical properties of rock and its use to determine rock strength and deformability of westerly granite, International Journal of Rock Mechanics and Mining Sciences, 37, pp. 285-296, (2000)

[4]

Heuze F.E., Scale effects in the determination of rock mass strength and deformability, Rock Mechanics, 12, pp. 167-192, (1980)

[5]

Huang T.H., Chang C.S., Yang Z.Y., Elastic moduli for fractured rock mass, Rock Mechanics and Rock Engineering, 28, 3, pp. 135-144, (1995)

[6]

Janbu N., Soil compressibility as determined by oedometer and triaxial test, Proceedings of the European Conference on Soil Mechanics and Foundation Engineering, Wiesbaden, 1, pp. 19-25, (1963)

[7]

Li C., A method for graphically presenting the deformation modulus of jointed rock masses, Rock Mechanics and Rock Engineering, 34, 1, pp. 67-75, (2001)

[8]

Ramamurthy T., Strength and modulus responses of anisotropic rocks, Comprehensive Rock Engineering, 1, pp. 313-329, (1993)

[9]

Ramamurthy T., Arora V.K., Strength prediction for jointed rocks in confined and unconfined states, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 31, 1, pp. 9-22, (1994)

[10]

Rao K.S., Tiwari R.P., Physical simulation of jointed model materials under biaxial and true triaxial stress states, (2002)

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