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| ANISOTROPIC STRENGTH CRITERION FOR COLUMNAR JOINTED ROCK MASSES |
| XIAO Weimin1，2，3，DENG Ronggui2，ZOU Zuyin1，3 |
| (1. School of Civil Engineering，Sichuan Agricultural University，Dujiangyan，Sichuan 611830，China；2. Department of Geotechnical Engineering，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；3. Sichuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction，Dujiangyan，Sichuan 611830，China) |
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Abstract A joint factor reflecting the distribution characteristics of columnar joints was introduced to represent the influences of joints on the strength of columnar jointed rock masses based on the nonlinear strength criterion proposed by Ramamurthy. An anisotropic strength criterion was suggested for the regular hexagonal columnar jointed rock masses with the strength nonlinearity being described with the power function. The method for calculating the joint factors of regular hexagonal columnar jointed rock masses was investigated，and the constants in the anisotropic strength criterion were determined with the uniaxial and triaxial compression results from tests simulating the columnar jointed rock masses. The experimental results on the strength of jointed rock masses published in the past literatures were used to validate the proposed strength criterion preliminarily. From the validation，it was found that the predictions from the proposed strength criterion agreed well with the experimental data，indicating that the anisotropic strength criterion described well the strength anisotropy and nonlinearity of columnar jointed rock masses.
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| [1] 郑文棠. 不规则柱状节理岩石力学及在高边坡坝基岩石工程中的应用[博士学位论文][D]. 南京：河海大学，2008.(ZHENG Wentang. Rock mechanics of irregular columnar jointed basaltic mass and its application in high slope and dam foundation[Ph. D. Thesis][D]. Nanjing：Hohai University，2008.(in Chinese))
[2] 宁 宇，徐卫亚，郑文棠，等. 柱状节理岩体随机模拟及其表征单元体尺寸研究[J]. 岩石力学与工程学报，2008，27(6)：1 202–1 208. (NING Yu，XU Weiya，ZHENG Wentang，et al. Study of random simulation of columnar jointed rock mass and its representative elementary volume scale[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(6)：1 202–1 208.(in Chinese))
[3] 闫东旭，徐卫亚，王 伟，等. 柱状节理岩体宏观等效特性模量尺寸效应研究[J]. 岩土工程学报，2012，34(2)：243–250.(YAN Dongxu，XU Weiya，WANG Wei，et al. Research of size effect on equivalent elastic modulus of columnar jointed rock mass[J]. Chinese Journal of Geotechnical Engineering，2012，34(2)：243–250.(in Chinese))
[4] 朱道建，杨林德，蔡永昌. 柱状节理岩体各向异性特性及尺寸效应研究[J]. 岩石力学与工程学报，2009，28(7)：1 405–1 414.(ZHU Daojian，YANG Linde，CAI Yongchang. Research on anisotropic characteristics and size effect of columnar jointed rock mass[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(7)： 1 405–1 414.(in Chinese))
[5] 钟世英，徐卫亚. 基于微结构张量理论的柱状节理岩体各向异性强度分析[J]. 岩土力学，2011，32(10)：3 081–3 084.(ZHONG Shiying，XU Weiya. Anisotropic failure criterion incorporating microstructure tensor for rock mass with columnar joints[J]. Rock and Soil Mechanics，2011，32(10)：3 081–3 084.(in Chinese))
[6] 秦 磊. 柱状节理玄武岩卸载破坏规律研究[硕士学位论文][D]. 武汉：长江科学院，2012.(QIN Lei. Researches on the failure law of columnar jointed basalt under unloaded conditions[M. S. Thesis][D]. Wuhan：Changjiang River Scientific Research Institute，2012.(in Chinese))
[7] 郑文棠，汪华安，葛军辉. 基于地质强度指标法的柱状节理玄武岩体力学强度估计[J]. 地质力学学报，2009，15(4)：330–335.(ZHENG Wentang，WANG Huaan，GE Junhui. Strength estimation of columnar jointed basaltic mass based on geological strength index[J]. Journal of Geomechanics，2009，15(4)：330–335.(in Chinese))
[8] JAEGER J C. Shear failure of anisotropic rocks[J]. Geological Magazine，1960，97(1)：65–72.
[9] HOEK E，BROWN E T. Practical estimates of rock mass strength[J]. International Journal of Rock Mechanics and Mining Sciences，1997，34(8)：1 165–1 186.
[10] RAMAMURTHY T. Strength and modulus responses of anisotropic rocks[C]// HUDSON J A，ed. Comprehensive Rock Engineering. Oxford：Pergamon Press，1993：313–329.
[11] RAMAMURTHY T，ARORA V K. Strength predictions for jointed rocks in confined and unconfined states[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1994，31(1)：9–22.
[12] SINGH M，SINGH B. Modified Mohr-Coulomb criterion for non- linear triaxial and polyaxial strength of jointed rocks[J]. International Journal of Rock Mechanics and Mining Sciences，2012，49(1)：43– 52.
[13] BARTON N. The shear strength of rock and rock joint[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1976，13(9)：255–279.
[14] MÜLLER G. Starch columns：analog model for basalt columns[J]. Journal of Geophysical Research，1998，103(B7)：15 239–15 253.
[15] MÜLLER G. Experimental simulation of basalt columns[J]. Journal of Vocanology and Geothermal Research，1998b，86(1/4)：93–96.
[16] 肖维民，邓荣贵，付小敏，等. 单轴压缩条件下柱状节理岩体变形和强度各向异性模型试验研究[J]. 岩石力学与工程学报，2014，33(5)：957–963.(XIAO Weimin，DENG Ronggui，FU Xiaomin，et al. Model experiments on deformation and strength anisotropy of columnar jointed rock masses under uniaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(5)：957–963. (in Chinese))
[17] 肖维民，邓荣贵，付小敏，等. 模拟柱状节理岩体常规三轴压缩下变形和强度特性试验研究[J]. 岩石力学与工程学报，2015，34(增1)：2 817–2 826.(XIAO Weimin，DENG Ronggui，FU Xiaomin，et al. Experimental study of deformation and strength properties of simulated columnar jointed rock masses under conventional triaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(Supp.1)：2 817–2 826.(in Chinese))
[18] HUDSON J A，PRIEST S D. Discontinuity frequency in rock masses[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1983，20(2)：73–89.
[19] STIMPSON B.. Failure of slopes containing discontinuous planar joints[C]// Proceedings of the 19th U.S. Symposium on Rock Mechanics. [S. l.]：[s. n.]，1978：351–357.
[20] YANG Z Y，CHEN J M，HUANG T H. Effect of joint sets on the strength and deformation of rock mass models[J]. International Journal of Rock Mechanics and Mining Sciences，1998，35(1)：75–84.
[21] YANG Z Y，LEE W S. Modeling the failure mechanism of rock mass models by UDEC[C]// Proceedings of the 9th ISRM Congress. Paris，France：[s. n. ]，1999：195–198.
[22] BROWN E T. Strength of models of rock with intermittent joints[J]. Journal of Soil Mechanics and Foundations Division，1970，96(6)： 1 935–1 949. |
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2015, Vol. 34 
