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| NUMERICAL SIMULATION OF PROGRESSIVE FAILURE OF INTERMITTENT JOINTED ROCK MASS TO DETERMINE EQUIVALENT MECHANICAL PARAMETERS |
| GUO Yunhua1，2，ZHU Weishen1，WANG Zhishen1，LI Yong1，LI Xinping2，LU Pengfei3 |
(1. Geotechnical and Structural Engineering Research Center，Shandong University，Jinan，Shandong 250061，China；2. Hubei Key Laboratory of Roadway，Bridge and Structure Engineering，Wuhan University of Technology，Wuhan，Hubei 430070，China；
3. Dagangshan Hydropower Development Co.，Ltd.，China Guodian Corporation，Shimian，Sichuan 625400，China) |
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Abstract
Abstract：The constitutive model is generally not considered in the standard for classification of engineering rock masses which provides only cohesion and friction angle. The mechanical parameters of rock and the results from the small-scale field tests can not be applied to engineering analysis directly. A numerical simulation method with randomly distributed fractures according to the statistical results was established to obtain the equivalent mechanical parameters through simulating the progressive failure of fractured rock mass. Under the condition of the geostress and unloading process，the strength parameters obtained with the numerical method was 30%–50% higher than that from the traditional empirical methods. The results obtained with two methods were in good agreement in both the weathering area and the unloading area. The value of the deformation modulus at unloading obtained with the numerical simulation was very close to one from the inversion analysis. The research indicates that using the numerical method to calculate the failure modes，the constitutive relation，the strength and the deformation parameters of rock mass is feasible.
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Received: 05 May 2014
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| [1] 龚晓南. 对岩土工程数值分析的几点思考[J]. 岩土力学，2011，32(2)：321–325.(GONG Xiaonan. Reflections on numerical analysis of geotechnical engineering[J]. Rock and Soil Mechanics，2011，32(2)：321–325.(in Chinese))
[2] HOMAND-ETIENNE F，HOXHA D，SHAO J F. A continuum damage constitutive law for brittle rocks[J]. Computers and Geotechnics，1998，22(2)：135–151.
[3] 张贵科，徐卫亚. 裂隙网络模拟与REV尺度研究[J]. 岩土力学，2008，29(6)：1 675–1 680.(ZHANG Guike，XU Weiya，Analysis of joint network simulation method and REV scale[J]. Rock and Soil Mechanics，2008，29(6)：1 675–1 680.(in Chinese)).
[4] 胡 波，王思敬，刘顺桂，等. 基于精细结构描述及数值试验的节理岩体参数确定与应用[J]. 岩石力学与工程学报，2007，26(12)：2 458–2 465.(HU Bo，WANG Sijing，LIU Shungui，et al. Determination and application of jointed rock mass parameters based on fine structure description and numerical experiment[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(12)：2 458–2 465.(in Chinese))
[5] 刘晓丽，王恩志，王思敬. 裂隙岩体精细结构描述及工程特性数值试验[J]. 岩石力学与工程学报，2008，27(增2)：3 935–3 940. (LIU Xiaoli，WANG Enzhi，WANG Sijing. Fine structure description for fractured rock mass and numerical tests on its engineering properties[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(Supp.2)：3 935–3 940.(in Chinese))
[6] 陈卫忠，杨建平，邹喜德，等. 裂隙岩体宏观力学参数研究[J]. 岩石力学与工程学报，2008，27(8)：1 569–1 575.(CHEN Weizhong，YANG Jianping，ZOU Xide，et al. Research on macromechanical parameters of fractured rock masses[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(8)：1 569–1 575.(in Chinese))
[7] RASHID Y R. Ultimate strength analysis of prestressed concrete pressure vessels[J]. Nuclear Engineering and Design，1968，7(4)：334–344.
[8] BA?ANT Z P. Concrete fracture models：testing and practice[J]. Engineering Fracture Mechanics，2002，69(2)：165–205.
[9] 黄润秋，黄 达. 卸荷条件下花岗岩力学特性试验研究[J]. 岩石力学与工程学报，2008，27(11)：2 205–2 213.(HUANG Runqiu，HUANG Da. Experimental research on mechanical properties of granites under unloading condition[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(11)：2 205–2 213.(in Chinese))
[10] 李宏哲，夏才初，闫子舰，等. 锦屏水电站大理岩在高应力条件下的卸荷力学特性研究[J]. 岩石力学与工程学报，2007，26(10)：2 104–2 109.(LI Hongze，XIA Caichu，YAN Zijian，et al. Study on marble unloading mechanical properties of Jinping hydropower station under high geostress conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(10)：2 104–2 109.(in Chinese))
[11] 向文飞，周创兵. 裂隙岩体表征单元体研究进展[J]. 岩石力学与工程学报，2005，24(增2)：5 686–5 692.(XIANG Wenfei，ZHOU Chuangbing. The advances in investigation of representative elementary volume for fractured rock mass[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(Supp.2)：5 686–5 692. (in Chinese))
[12] 张建国，张强勇，杨文东，等. 大岗山水电站坝区初始地应力场反演分析[J]. 岩土力学，2009，30(10)：3 071–3 078.(ZHANG Jianguo，ZHANG Qiangyong，YANG Wendong，et al. Regression analysis of initial geostress field in dam zone of Dagangshan hydropower station[J]. Rock and Soil Mechanics，2009，30(10)：3 071–3 078.(in Chinese))
[13] 岳晓蕾. 大岗山地应力反演与工程应用研究[硕士学位论文][D]. 济南：山东大学，2006.(YUE Xiaolei. Regression analysis of initial geostress field of Dagangshan and its application[M. S. Thesis] [D]. Jinan：Shandong University，2006.(in Chines))
[14] 曾纪全，贺如平，王建洪. 岩体抗剪强度试验成果整理及参数选取[J]. 地下空间与工程学报，2007，2(8)：1 403–1 407.(ZENG Jiquan，HE Ruping，WANG Jianhong. Results processing and parameters selection of shear strength test on rock Chinese[J]. Chinese Journal of Underground Space and Engineering，2007，2(8)：1 403–1 407.(in Chinese))
[15] 周火明，孔祥辉. 水利水电工程岩石力学参数取值问题与对策[J]. 长江科学院院报，2006，23(4)：36–40.(ZHOU Huoming，KONG Xianghui. Problems and countermeasures on parameter selection of rock mechanics in water conservancy and hydropower projects[J]. Journal of Yangtze River Scientific Reserch Institute，2006，23(4)：36–40.(in Chinese))
[16] HOEK E，CARRANZA-TORRES C，CORKUM B. Hoek-Brown failure criterion—2002 edition[C]// HAMMAH R，BAWDEN W F，CURRAN J，et al. ed. Proceedings of the North American Rock Mechanics Society NARMS-TAC 2002. Toronto：University of Toronto Press，2002：267–273.
[17] 何满潮，薛廷河，彭延飞. 工程岩体力学参数确定方法的研究[J]. 岩石力学与工程学报，2001，20(2)：225–229.(HE Manchao，XUE Tinghe，PENG Yanfei. A new way of determining mechanical parameters of engineering rock masses[J]. Chinese Journal of Rock Mechanics and Engineering，2001，20(2)：225–229.(in Chinese)) |
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2014, Vol. 33 
