|
|
|
| EXPERIMENTAL RESEARCH ON INFLUENCE OF CYCLIC LOADING AND UNLOADING ON ROCK MASS RESIDUAL STRENGTH |
| (1. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area of Ministry of Education，China Three Gorges University，Yichang，Hubei 443002，China；2. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources，Yangtze River Scientific Research Institute，Wuhan，Hubei 430010，China) |
|
|
|
|
Abstract The mechanical properties of underground tunnel，cavern and pillar in deep high stress area are closely linked to the mechanical properties of rock after failure. Research on residual strength and post-peak mechanical properties of rock mass has very important significance for engineering design. Through cyclic loading and unloading experiments of failure rock mass，variation law of residual strength under different confining pressures(30，20，10，5 and 1 MPa) and different unloading degrees (90%，70%，30%) has been studied. The results show that the relationship between residual strength and cycle number can be fitted with the exponential function，no matter how the initial conditions are. When the confining pressure is relatively lower(≤20 MPa)，at the same confining pressure，the reduction degree of residual strength is the maximum at unloading degree of 70%，followed by unloading degree of 90%. On the other hand，the reduction degree of residual strength is the minimum at unloading degree of 30%. With the same amount of unloading degree，the lower the confining pressure is，the greater the reduction degree of residual strength is；under confining pressure of 1 MPa，the residual strength even may reduce by 73%. As confining pressure is large(＞20 MPa)，because of binding and compressive effect of the confining pressure，cyclic loading and unloading will not result in lower residual strength of rock samples.
|
|
Received: 13 May 2010
|
|
|
|
| [1] 靖洪文. 峰后岩石剪胀性能试验研究[J]. 岩土力学，2003，24(1)：93–96，102.(JING Hongwen. Experimental study on dilatancy nature of the rock post-peak behavior[J]. Rock and Soil Mechanics，2003，24(1)：93–96，102.(in Chinese))
[2] 郭富利，张顶立，苏 洁，等. 围压和地下水对软岩残余强度及峰后体积变化影响的试验研究[J]. 岩石力学与工程学报，2009，28(增1)：2 644–2 650.(GUO Fuli，ZHANG Dingli，SU Jie，et al. Experimental study of influences of confining pressures and ground water on residual strength and post-peak volumetric change of soft rock[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(Supp.1)：2 644–2 650.(in Chinese))
[3] 鄢建华，黄宝德，汤 雷. 岩石类材料峰后本构关系研究进展[J]. 地质灾害与环境保护，2003，14(4)：59–62.(YAN Jianhua，HUANG Baode，TANG Lei. The current study and development trend in researching on the constitutive relation of rock in the post-peak area[J]. Journal of Geological Hazards and Environment Preservation，2003，14(4)：59–62.(in Chinese))
[4] 钟时猷，徐纪成. 破裂岩石力学性态的模拟研究[J].中南大学学报(自然科学版)，1986，(6)：14–20.(ZHONG Shiyou，XU Jicheng. A modelling investigation of the mechanical behaviour of rocks with fractures[J]. Journal of Central South University(Science and Technology)，1986，(6)：14–20.(in Chinese))
[5] 徐松林，吴 文，王广印，等. 大理岩等围压三轴压缩全过程研究I：三轴压缩全过程和峰前、峰后卸围压全过程实验[J]. 岩石力学与工程学报，2001，20(6)：763–767.(XU Songlin，WU Wen，WANG Guangyin，et al. Study on complete procedures of marble under triaxial compression I：testing study on complete procedure of triaxial compression and the processes of unloading confining at the pre-peak and post-peak[J]. Chinese Journal of Rock Mechanics and Engineering，2001，20(6)：763–767.(in Chinese))
[6] 汪新红，王明洋. 岩爆与峰后岩石力学特性[J]. 岩土力学，2006，27(6)：913–919.(WANG Xinhong，WANG Mingyang. Relation between rock-burst and rock post-peak behavior[J]. Rock and Soil Mechanics，2006，27(6)：913–919.(in Chinese))
[7] 张黎明，王在泉. 考虑岩体峰后非线性软化的衬砌压力隧洞应力解[J]. 岩土力学，2008，29(增 1)：283–287.(ZHANG Liming，WANG Zaiquan. Stress solution of pressure on tunnel liner considering nonlinear softening of rock mass post-peak[J]. Rock and Soil Mechanics，2008，29(Supp.1)：283–287.(in Chinese))
[8] 张 帆，盛 谦，朱泽奇，等. 三峡花岗岩峰后力学特性及应变软化模型研究[J]. 岩石力学与工程学报，2008，27(增 1)：2 651–2 655. (ZHANG Fan，SHENG Qian，ZHU Zeqi，et al. Study on post-peak mechanical behaviour and strain-softening model of Three Gorges granite[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(Supp.1)：2 651–2 655.(in Chinese))
[9] 陆银龙，王连国，杨 峰，等. 软弱岩石峰后应变软化力学特性研究[J]. 岩石力学与工程学报，2010，29(3)：640–648.(LU Yinlong，WANG Lianguo，YANG Feng，et al. Post-peak strain softening mechanical properties of weak rock[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(3)：640–648.(in Chinese))
[10] POUYA A，GHOREYCHI M. Determination of rock mass strength properties by homogenization[J]. International Journal for Numerical and Analytical Methods in Geomechanics，2001，25(13)：1 285–1 303.
[11] STEINER W. Swelling rock in tunnels：rock characterization，effect of horizontal stresses and construction procedures[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1993，30(4)：361–380.
[12] 吴 刚，张 磊. 单轴压缩下岩石破坏后区的扰动状态概念分析[J]. 岩石力学与工程学报，2004，23(10)：1 628–1 634.(WU Gang，ZHANG Lei. Analysis of post-failure behaviors of rock in uniaxial compression using disturbed state concept theory[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(10)：1 628–1 634.(in Chinese))
[13] 郑 宏，葛修润，李焯芬. 脆塑性岩体的分析原理及其应用[J]. 岩石力学与工程学报，1997，16(1)：8–21.(ZHENG Hong，GE Xiurun，LEE C F. Analysis principle for rock mass with brittle plasticity and its applications[J]. Chinese Journal of Rock Mechanics and Engineering，1997，16(1)：8–21.(in Chinese))
[14] 金济山，石泽全，方 华，等. 在三轴压缩下大理岩循环加载试验的初步研究[J]. 地球物理学报，1991，34(4)：488–494.(JIN Jishan，SHI Zequan，FANG Hua，et al. A preliminary study on cyclic loading experiments of marble under triaxial compression[J]. Chinese Journal of Geophysics，1991，34(4)：488–494.(in Chinese))
[15] BYERLEE J D. Friction of rock[J]. Pure and Applied Geophysics，1978，116(4–5)：615–626. |
|
|
|
2010, Vol. 29 
