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| POST-PEAK DEFORMATION AND FAILURE EXPERIMENTAL STUDY
OF ROCK-LIKE SPECIMENS WITH DIFFERENT INCLINATION
ANGLES PERSISTENT JOINTS |
| LI Shuchen1，WANG Lei1，2，LI Shucai1，HAN Jianxin1，3 |
| (1. Geotechnical and Structural Engineering Research Center，Shandong University，Jinan，Shandong 250061，China；2. Institute of Engineering Corps，Three Lines，Xuzhou，Jiangsu 221004，China；3. School of Mathematic and Quantitative Economics，Shandong University of Finance and Economics，Jinan，Shandong 250014，China) |
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Abstract The uniaxial compression test of pre-existing persistent jointed rock-like specimens is carried out by high stiffness servo control testing machine. Systematic researches on the relationship of post-peak stress-strain curve，failure form，strength after peak，the Poisson?s ratio after peak of rock masses with dip angles of persistent joints are performed. The results indicate that：(1) The post-peak stress-strain curves of specimens with joint inclination angle of 15°and complete specimens are basically the same，but the post-peak stress-strain curves of specimens with the joint inclination angle of 30°，40°，50° to 60° and complete specimens vary greatly. (2) Peak strength decreases with the increase of joint inclination angle，residual post-peak strength also generally increases as the joint angle increases. (3) Poisson?s ratio of jointed specimen increases with joint inclination angle increases，but the post-peak visual Poisson?s ratio becomes smaller in the phase of destruction with joint inclination angle increases. (4) The post-peak failure modes of specimen change with joint inclination angle. Specimens damage is splitting failure at the joint inclination angle of 15°，shear failure at the joint inclination angle of 50° and 60°， splitting and shear mixing model at the joint inclination angle of 30° and 40°. The research result can reflect mechanics，deformation and damage characteristics under uniaxial compressive loading in the phase of post-peak of rock masses with different dip angles pre-existing persistent joints.
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Received: 05 November 2012
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| [1] JAEGER J C，N J W. Fundamentals of Rock Mechanics[M]. 4th ed. London：Chapmen and Hall，2007：419–430.
[2] 晏石林，黄玉盈，陈传尧. 贯通节理岩体等效模型与弹性参数确定[J]. 华中科大学学报：自然科学版，2001，29(6)：60–63.(YAN Shilin，HUANG Yuying，CHEN Chuanyao. An equivalent model for jointed rock mass with persistent joint and its elastic parameters[J]. Journal of Huazhong University of Science and Technology：Natural Science，2001，29(6)：60–63.(in Chinese))
[3] WONG R H C，TANG C A，CHAU K T，et al. Splitting failure in brittle rocks containing pre-existing flaws under uniaxial compression[J]. Engineering Fracture Mechanics，2002，69(17)：1 853–1 871.
[4] 李树忱，冯现大，李术才，等. 深部岩体分区破裂化现象数值模拟[J]. 岩石力学与工程学报，2011，30(7)：1 338–1 344.(LI Shuchen，FENG Xianda，LI Shucai，et al. Numerical simulation of zonal disintegration for deep rock mass[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(7)：1 338–1 344.(in Chinese))
[5] BRADY B H G，BROWN E T. Rock Mechanics for underground mining[M]. [S. l.]：Kluwer Academic Publishers，2005：454–647.
[6] 周维垣. 高等岩石力学[M]. 北京：水利水电出版社，1990：296–310.(ZHOU Weiyuan. Higher Rock Mechanics[M]. Beijing：China Water Power Press，1990：296–310.(in Chinese))
[7] 夏才初，李宏哲，刘 胜. 含节理岩石试件的卸荷变形特性研究[J].岩石力学与工程学报，2010，29(4)：697–704.(XIA Caichu，LI Hongzhe，LIU Sheng. Study of deformation properties of jointed specimens under unloading conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(4)：697–704.(in Chinese))
[8] 李宏哲，夏才初，王晓东，等. 含节理大理岩变形和强度特性的试验研究[J]. 岩石力学与工程学报，2008，27(10)：2 118–2 123.(LI Hongzhe，XIA Caichu，WANG Xiaodong，et al. Experimental study on deformation and strength properties of jointed marble specimens[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(10)： 2 118–2 123.(in Chinese))
[9] KULATILAKE P H S W，HE W，UM J，et al. A physical model study of jointed rock mass strength under uniaxial compressive loading[J]. International Journal of Rock Mechanics and Mining Sciences，1997，34(3/4)：165.e1–165.e15.
[10] YANG S Q，DAI Y H，HAN L J，et al. Experimental study on mechanical behavior of brittle marble samples containing different flaws under uniaxial compression[J]. Engineering Fracture Mechanics，2009，76(12)：1 833–1 845.
[11] 葛修润，周百海，刘明贵. 对岩石峰值后区特性的新见解[J]. 中国矿业，1992，(2)：57–60.(GE Xiurun，ZHOU Baihai，LIU Minggui. A new understanding of post-failure behaviour of rock[J]. China Mining Magazine，1992，(2)：57–60.(in Chinese))
[12] 靖洪文. 峰后岩石剪胀性能试验研究[J]. 岩土力学，2003，24(1)：93–102.(JING Hongwen. Experimental study on dilatancy nature of the rock post-peak behavior[J]. Rock and Soil Mechanics，2003，24(1)：93–102.(in Chinese))
[13] 陈 新，廖志红，李德建. 节理倾角及连通率对岩体强度、变形影响的单轴压缩试验研究[J]. 岩石力学与工程学报，2011，30(4)：781–789.(CHEN Xin，LIAO Zhihong，LI Dejian. Experimental study of effects of joint inclination angle and connectivity rate on strength and deformation properties of rock masses under uniaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(4)：781–789.(in Chinese))
[14] WASANTHA P L P，RANJITH P G. Influence of the geometry of partially-spanning joints on the uniaxial compressive strength of rock[J]. International Journal of Rock Mechanics and Mining Sciences，2012，50(2)：140–146. |
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2013, Vol. 32 
