|
|
|
| STUDY OF DEFORMATION AND ENERGY PROPERTIES OF MARBLE UNLOADING FAILURE |
| GAO Su，ZHANG Liming，WANG Zaiquan，CONG Yu |
| (College of Science，Qingdao Technological University，Qingdao，Shandong 266033，China) |
|
|
|
|
Abstract Pre-peak and post-peak strength unloading failure experiments on marble under constant axial pressure were conducted. The characteristics of deformation and energy evolution during the process of marble failure were studied. Results show that the lateral deformation decreases with the increase of unloading rate. The axial deformation is relatively small. It has no relation with unloading rates under the condition of constant axial pressure. The failure mode is typical shear failure under the pre-peak or post-peak strength unloading. Unloading after the peak strength leads to obviously conjugate shear zone. Marble unloading failure process can be divided into three stages according to energy evolution：energy accumulation stage，energy dissipation stage and energy release stage. The faster the unloading rate，the more quickly and more intensely the elastic strain energy releases. The change rate of dissipated energy goes up with the unloading rate increase. And it is ten times larger than the rate of elastic strain energy. Dissipation energy plays a dominant role in the rock's failure process. The rapid energy dissipation is the main feature of marble unloading failure.
|
|
Received: 20 May 2013
|
|
|
|
| [1] 哈秋舲. 岩石边坡工程与卸荷非线性岩石(体)力学[J]. 岩石力学与工程学报，1997，16(4)：386–391.(HA Qiuling. Rock slope engineering and unloading nonlinear rock mass mechanics[J]. Chinese Journal of Rock Mechanics and Engineering，1997，16(4)：386–391. (in Chinese))
[2] 张 凯，周 辉，潘鹏志，等. 不同卸荷速率下岩石强度特性研究[J]. 岩土力学，2010，31(7)：2 072–2 078.(ZHANG Kai，ZHOU Hui，PAN Pengzhi，et al. Characteristics of strength of rocks under different unloading rates[J]. Rock and Soil Mechanics，2010，31(7)：2 072–2 078.(in Chinese))
[3] 邱士利，冯夏庭，张传庆，等. 不同卸围压速率下深埋大理岩卸荷力学特性试验研究[J]. 岩石力学与工程学报，2010，29(9)：1 807–1 817.(QIU Shili，FENG Xiating，ZHANG Chuanqing，et al. Experimental research on mechanical properties of deep-buried marble under different unloading rates of confining pressures[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(9)：1 807–1 817. (in Chinese))
[4] 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))
[5] 黄 达，谭 清，黄润秋. 高围压卸荷条件下大理岩破碎块度分形特征及其与能量相关性研究[J]. 岩石力学与工程学报，2012，31(7)：1 379–1 389.(HUANG Da，TAN Qing，HUANG Runqiu. Fractal characteristics of fragmentation and correlation with energy of marble under unloading with high confining pressure[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(7)：1 379–1 389.(in Chinese))
[6] HUA A Z，YOU M Q. Rock failure due to energy release during unloading and application to underground rock burst control[J]. Tunnelling and Underground Space Technology，2001，16(3)：241–246.
[7] 陈卫忠，吕森鹏，郭小红，等. 基于能量原理的卸围压试验与岩爆判据研究[J]. 岩石力学与工程学报，2009，28(8)：1 530–1 540. (CHEN Weizhong，LU Senpeng，GUO Xiaohong，et al. Research on unloading confining pressure tests and rock burst criterion based on energy theory[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(8)：1 530–1 540.(in Chinese))
[8] 刘天为，何江达，徐文杰. 大理岩三轴压缩破坏的能量特征分析[J]. 岩土工程学报，2013，35(2)：395–400.(LIU Tianwei，HE Jiangda，XU Wenjie. Energy properties of failure of marble samples under triaxial compression[J]. Chinese Journal of Geotechnical Engineering，2013，35(2)：395–400.(in Chinese))
[9] 谢和平，鞠 杨，黎立云. 基于能量耗散与释放原理的岩石强度与整体破坏准则[J]. 岩石力学与工程学报，2005，24(17)：3 003–3 010. (XIE Heping，JU Yang，LI Liyun. Criteria for strength and structural failure of rocks based on energy dissipation and energy release principles[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(17)：3 003–3 010.(in Chinese))
[10] 刘晓明，熊 力，刘建华，等. 基于能量耗散原理的红砂岩崩解机制研究[J]. 中南大学学报：自然科学版，2011，42(10)：3 143–3 149. (LIU Xiaoming，XIONG Li，LIU Jianhua，et al. Slacking mechanism of red sandstone based on energy dissipation principle[J]. Journal of Central South Universty：Science and Technology，2011，42(10)：3 143–3 149.(in Chinese)) |
|
|
|
2014, Vol. 33 
