|
|
|
| STABILITY CALCULATION FOR DISCRETE FRACTURE NETWORK OF ROCK MASSES BASED ON JOINT FINITE ELEMENT METHOD |
| WANG Yu1，2，LI Xiao1，LIU Shuai3，HE Jianming1，LI Shouding1，LI Tengfei1，2 |
(1. Key Laboratory of Engineering Geomechanics，Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China；2. University of Chinese Academy of Sciences，Beijing 100049，China；3. Faculty of Engineering，
China University of Geosciences，Wuhan，Hubei 430074，China) |
|
|
|
|
Abstract Through stability of many fractured rock masses slopes on Guangle highway，conclusion obtained that objective geological model，appropriate constitutive relation，accurate parameters and effective calculation method are the key problems for stability evaluation. The joint finite element method(JFEM) is proposed. In the method，the fractured rock massed are composed of rock block and fracture network，the properties of rock block and joint are considered simultaneously，reflecting the nonlinear relation of contaction fully. Firstly，based on the single structure surface theory proposed by Jaeger，the compression strength of fractured rock massed is calculated by JFEM，which verifies the reliability of the JFEM. Secondly，introducing discrete fracture network model，the stability of fractured rock masses is discussed based on Voronoi model，Baecher model and Veneziano model. The generalized Hoek-Brown criterion and Barton-Bandis criterion are applied to rock block and joint，respectively. Using the strength reduction method to calculate stability factor，the influences of key parameters in DFN on the slope stability are discussed. The research provides a new idea for the stability evaluation of fractured rock masses and theoretical basis to engineering decision.
|
|
Received: 18 May 2012
|
|
|
|
| [1] MORLAND L W. Continuum model of regularly jointed mediums[J]. Journal of Geophysical Research，1974，79(2)：357–362.
[2] 盛金昌，速宝玉，詹美礼. 裂隙岩体的弹塑性本构模型及有限元分析[J]. 河海大学学报，27(5)：1999：28–33.(SHENG Jinchang，SU Baoyu，ZHAN Meili. A constitutive model of joint rock masses and its finite element analysis[J]. Journal of Hehai University，1999，27(5)：28–33.(in Chinese))
[3] GOODMAN R E，TAYLOR R L，BREKKE T L. A model for the mechanics of jointed rock[J]. Journal of the Soil Mechanics and Foundations Division，ASCE，1968，99(5)：637–660.
[4] 李守德，俞洪良. Goodman接触面单元的修正与探讨[J]. 岩石力学与工程学报，2004，23(15)：2 628–2 631.(LI Shoude，YU Hongliang. Modification of Goodman interface element[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(15)：2 628–2 631.(in Chinese))
[5] BAECHER G B，LANNEY N A，EINSTEIN H H. Statistical description of rock properties and sampling[C]//Proceedings of the 18th U. S. Symposium on Rock Mechanics. [S.l.]：[s. n.]，1978：5–8.
[6] Rocscience Inc.. Phase 2 joint network verification[R]. Ontario：Rocscience Inc.，2011.
[7] GOODMAN R E，TAYLOR R L，BREKKE T L. A model for the mechanics of jointed rock[J]. Journal of the Soil Mechanics and Foundations Division，ASCE，1968，99(5)：637–660.
[8] HOEK E，CARRANZA-TORRES C T，CORKUM B. Hoek-Brown failure criterion-2002 edition[C]// Proceedings of the fifth North American rock mechanics symposium. Toronto，Canada：[s. n.]，2002：267–73.
[9] BARTON N R，CHOUBEY V. The shear strength of rock joints in theory and practice[J]. Rock Mechanics and Rock Engineering，1977， 10(1/2)：1–54.
[10] BARTON N，BANDIS S，BAKHTAR K. Deformation and conductivity coupling of rock joint[J]. International Journal of Rock Mechanics and Mining Science，1985，22(3)：121–140.
[11] BARTON N R. A review of the shear strength of filled discontinuities in rock[C]// Norwegian Geotech Nical Institute. Oslo，Norwegion：Norwegian Geotech nical Institute，1974：105.
[12] BARTON N R. The shear strength of rock and rock joints[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1976，13(10)：1–24.
[13] BARTON N R. Review of a new shear strength criterion for rock joints[J]. Engineering Geology，1973，7(4)：287–332.
[14] BARTON N R，BANDIS S C. Effects of block size on the the shear behaviour of jointed rock[C]// The 23rd U.S. Symposium on rock mechanics. Berkeley：[s. n.]，1982：739–760.
[15] Rocscience Inc.. Phase 2 joint network verification[R]. Ontario：Rocscience Inc.，2011.
[16] BARTON N. Shear-strength of rock and rock joints[J]. International Journal of Rock Mechanics and Mining Sciences，1976，13(9)：255–279.
[17] DERSHOWITZ W. Rock joint systems[Ph. D. Thesis][D]. Cambridge，Massachusetts：Massachusetts Institute of Technology，1985.
[18] DEBASIS D， KAMAL D. Extended finite element method for the analysis of discontinuities in rock masses[J]. Geotechnical and Geological Engineering，2010，28(5)：643–659.
[19] CACAS M C，LEDOUX B，De Marsity G，et al. Modeling fracture flow with a stochastic discrete fracture networek：calibration and validation[J]. Water Resour .Research Journal，1990，26(3)，479–489.
[20] KULATILAKE P H S W，WU T H .The density of discontinuity traces in sampling windows[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1984，21(6)：354–347.
[21] LEE C H，FARMER I. Fluid flow in dis continuous rock[M]. [S. l.]：Chapman and Hall，1993：172–175. |
|
|
|
2013, Vol. 32 
