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| SIMULATION EXPERIMENT OF ROCKMASS LOOSENING INDUCED BY EXCAVATION LOAD TRANSIENT UNLOADING |
| LUO Yi1，2，LU Wenbo3，4，CHEN Ming3，4，YAN Peng3，4 |
(1. Hubei Key Laboratory of Road-bridge and Structure Engineering，Wuhan University of Technology，Wuhan，Hubei 430070，China；2. School of Civil Engineering and Architecture，Wuhan University of Technology，Wuhan，Hubei 430070，China；
3. State Key Laboratory of Water Resources and Hydropower Engineering Science，Wuhan University，Wuhan，
Hubei 430072，China；4. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering，
Ministry of Education，Wuhan University，Wuhan，Hubei 430072，China) |
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Abstract In order to study the loosening effect induced by rock mass excavation under high in-situ stress，a laboratory experimental simulation system was designed. By the rapid failure of a rock bar，the system is capable of simulating rapid unloading for jointed rock mass，thus is able to simulate the loosening effect of jointed rock mass under excavation load transient unloading(ELTU)，by which，the relationship of in-situ stress level and structural plane opening displacement can be studied. Regression analysis results show that，the opening displacement value is in positive relationship with the square value of in-situ stress. The proportion of displacement on each joint in the total displacement induced by excavation load transient unloading is dependent on the amount and location of joints.
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| [1] 魏进兵，邓建辉，王俤剀，等. 锦屏一级水电站地下厂房围岩变形与破坏特征分析[J].岩石力学与工程学报，2010，29(6)：1 198–1 205. (WEI Jinbing，DENG Jianhui，WANG Dikai，et al. Characterization of deformation and fracture for rock mass in underground powerhouse of Jinping I hydropower station[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(6)：1 198–1 205.(in Chinese))
[2] 江 权，侯 靖，冯夏庭，等. 锦屏二级水电站地下厂房围岩局部不稳定问题的实时动态反馈分析与工程调控研究[J]. 岩石力学与工程学报，2008，27(9)：1 899–1 907.(JIANG Quan，HOU Jing，FENG Xiating，et al. Dynamic feedback analysis and engineering control of surrounding rock local instability in underground powerhouse of Jinping II hydropower station[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(9)：1 899–1 907.(in Chinese))
[3] COOK N G W. Seismicity associated with mining[J]. Engineering Geology，1976，10(2/4)：99–122.
[4] ABUOV M，AITALIEV S，ERMEKOV T，et al. Studies of the effect of dynamic processes during explosive break-out upon the roof of mining excavations[J]. Journal of Mining Science，1988，24(6)：581–590.
[5] CARTER J，BOOKER J. Sudden excavation of a long circular tunnel in elastic ground[J]. International Journal of Rock Mechanics and Mining Sciences，1990，27(2)：129–132.
[6] 罗先启，舒茂修. 岩爆的动力断裂判据——D判据[J]. 中国地质灾害与防治学报，1996，(2)：1–5.(LUO Xianqi，SHU Maoxiu. Dynamic fracture criterion of rock blasting—D criterion[J]. The Chinese Journal of Geological Hazard And Control，1996，(2)：1–5.(in Chinese))
[7] 王贤能，黄润秋. 岩石卸荷破坏特征与岩爆效应[J]. 山地研究，1998，(4)：26–30.(WANG Xianneng，HUANG Runqiu. Analysis of deformation and failure features characteristics of rock under unloalding conditions and their effects on rock burst[J]. Journal of Mountain Research，1998，(4)：26–30.(in Chinese))
[8] 卢文波，周创兵，陈 明，等. 开挖卸荷的瞬态特性研究[J]. 岩石力学与工程学报，2008，27(11)：2 184–2 192.(LU Wenbo，ZHOU Chuangbing，CHEN Ming，et al. Research on transient characteristics of excavation unloading[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(11)：2 184–2 192.(in Chinese))
[9] 卢文波，金 李，陈 明，等. 节理岩体爆破开挖过程中的动态卸荷松动机制研究[J]. 岩石力学与工程学报，2005，24(增1)：4 653– 4 657.(LU Wenbo，JIN Li，CHEN Ming，et al. Study on the mechanism of the loosing of the jointed rock mass caused by the dynamic unloading of initial stress during rock blasting[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(Supp.1)：4 653–4 657. (in Chinese))
[10] 孙金山，金 李，姜清辉，等. 地下洞室爆破开挖过程中地应力瞬态调整诱发节理围岩松动机制研究[J]. 振动与冲击，2011，30(12)：28–34.(SUN Jinshan，JIN Li，JIANG Qinghui，et al. Loosing mechanism of jointed rock mass induced by transient adjustment of in-situ stress[J]. Journal of Vibration and Shock，2011，30(12)：28–34.(in Chinese))
[11] 金 李. 节理岩体开挖动态卸荷松动机制研究[博士学位论文][D]. 武汉：武汉大学，2009.(JIN Li. Study on the loosing mechanism of jointed rock mass induced by dynamic unloading during excavation[Ph. D. Thesis][D]. Wuhan：Wuhan University，2009.(in Chinese))
[12] 罗 忆，卢文波，周创兵，等. 高地应力条件下地下厂房开挖动态卸荷引起的变形突变机制研究[J]. 岩土力学，2011，32(10)：1 553– 1 560.(LUO Yi，LU Wenbo，ZHOU Chuangbing，et al. Mechanism study of abrupt deformation of underground powerhouse induced by excavation unloading under high in-situ stress[J]. Rock and Soil Mechanics，2011，32(10)：1 553–1 560.(in Chinese))
[13] HIBINO S，MOTOJIMA M. Characteristic behavior of rock mass during excavation of large scale caverns[C]// Proceedings of the 8th International Conference of ISRM. Tokyo：[s.n.]，1995：583–586.
[14] 黄 达，黄润秋. 卸荷条件下裂隙岩体变形破坏及裂纹扩展演化的物理模型试验[J]. 岩石力学与工程报，2010，29(3)：502–512.(HUANG Da，HUANG Runqiu. Physical model test on deformation failure and crack propagation evolvement of fissured rocks under unloading[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(3)：502–512.(in Chinese))
[15] 王洪亮，范鹏贤，王明洋，等. 应变率对红砂岩渐进破坏过程和特征应力的影响[J]. 岩土力学，2011，32(5)：1 340–1 346.(WANG Hongliang，FAN Pengxian，WANG Mingyang，et al. Influence of strain rate on progressive failure process and characteristic stresses of red sandstone[J]. Rock and Soil Mechanics，2011，32(5)：1 340–1 346.(in Chinese))
[16] 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))
[17] 王在泉，张黎明，孙 辉. 含天然节理灰岩加、卸荷力学特性试验研究[J]. 岩石力学与工程学报，2010，29(增1)：3 308– 3 313.(WANG Zaiquan，ZHANG Liming，SUN Hui. Experimental research on mechanical properties of limestone containing natural joints under loading and unloading conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(Supp.1)：3 308–3 313.(in Chinese)) |
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2015, Vol. 34 
