|
|
|
| STRESS DISTRIBUTION AND FAILURE DEPTHS OF LAYERED ROCK MASS OF MINING FLOOR |
| LU Haifeng1，2，YAO Duoxi1 |
(1. College of Earth and Environment，Anhui University of Science and Technology，Huainan，Anhui 232001，China；
2. State Key Laboratory of Coal Resources and Safe Mining，China University of Mining and Technology，Beijing 100083，China) |
|
|
|
|
Abstract The proper estimation of failure depths of mining floors is an important issue during mining above a confined aquifer. The layered rock mass of the floor is regarded as a transverse isotropic and continuous body. An analytical solution of the stresses in the transverse isotropic floor was derived considering the load distribution of seam overburden under the mining condition. The influence of the anisotropy(E1/E2，?1/?2) of deformation parameters of the transverse isotropic floor on the stress distribution was analysed. The dangerous shear plane of the transverse isotropic rock mass is found by the method of trial searching according to the calculated stress results and the Mohr-Coulomb yield criterion. The dangerous shear plane is then judged to be failure or not. The anisotropy of the elastic modulus is found to have a big effect on all kinds of stress distributions of the mining floor. The influence of the anisotropy of Poisson?s ratio on the vertical stress and shear stress is very small，but very significant on the horizontal stress. The calculated maximum failure depth and its location on the transverse isotropic floor are basically consistent with the results from the in-situ injection test due to considering the anisotropy of deformation and strength of layered rock mass.
|
|
Received: 21 October 2013
|
|
|
|
| [1] 杨天鸿，唐春安，谭志宏. 岩体破坏突水模型研究现状及突水预测预报研究发展趋势[J]. 岩石力学与工程学报，2007，26(2)：268–277.(YANG Tianhong，TANG Chun?an，TAN Zhihong. State of the art of inrush models in rock mass failure and developing trend for predication and forecast of groundwater inrush[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(2)：268–277.(in Chinese))
[2] 武 强，崔芳鹏，赵苏启，等. 矿井水害类型划分及主要特征分析[J]. 煤炭学报，2013，38(4)：561–565.(WU Qiang，CUI Fangpeng，ZHAO Suqi，et al. Type classification and main characteristics of mine water disasters[J]. Journal of China Coal Society，2013，38(4)：561–565.(in Chinese))
[3] 张金才. 岩体渗流与煤层底板突水[M]. 北京：地质出版社，1997：24–33.(ZHANG Jincai. Rock mass seepage and water inrush from seam floor[M]. Beijing：Geological Press，1997：24–33.(in Chinese))
[4] 彭维红，董正筑，李顺才. 半平面体弹性问题的边界积分公式及应用[J]. 中国矿业大学学报，2005，34(3)：400–404.(PENG Weihong，DONG Zhengzhu，LI Shuncai. Boundary integral formula of semiplane elasticity problem and its application[J]. Journal of China University of Mining and Technology，2005，34(3)：400–404.(in Chinese))
[5] 朱术云，姜振泉，姚 普，等. 采场底板岩层应力的解析法计算及应用[J]. 采矿与安全工程学报，2007，24(2)：191–194.(ZHU Shuyun，JIANG Zhenquan，YAO Pu，et al. Application of analytic method in calculating floor stress of a working face[J]. Journal of Mining and Safety Engineering，2007，24(2)：192–195.(in Chinese))
[6] 孟祥瑞，徐铖辉，高召宁，等. 采场底板应力分布及破坏机制[J]. 煤炭学报，2010，35(11)：1 832–1 836.(MENG Xiangrui，XU Chenghui，GAO Zhaoning，et al. Stress distribution and damage mechanism of mining floor[J]. Journal of China Coal Society，2010，35(11)：1 832–1 836.(in Chinese))
[7] 张华磊，王连国. 采动底板附加应力计算及其应用研究[J]. 采矿与安全工程学报，2011，28(2)：288–293.(ZHANG Hualei，WANG Lianguo. Computation of mining induced floor additional stress and its application[J]. Journal of Mining and Safety Engineering，2011，28(2)：288–293.(in Chinese))
[8] 王连国，韩 猛，王占盛. 采场底板应力分布与破坏规律研究[J]. 采矿与安全工程学报，2013，30(3)：317–322.(WANG Lianguo，HAN Meng，WANG Zhansheng，et al. Stress distribution and damage law of mining floor[J]. Journal of Mining and Safety Engineering，2013，30(3)：317–322.(in Chinese))
[9] WANG J A，PARK H D. Coal mining above a confined aquifer[J]. International Journal of Rock Mechanics and Mining Sciences，2003，40(4)：537–551.
[10] 吴基文，樊 成，刘小红. 杨庄煤矿六煤底板采动效应研究[J]. 岩土力学，2003，24(4)：549–552.(WU Jiwen，FAN Cheng，LIU Xiaohong. Research on mining effect of the No.6 coal seam floor in Yangzhuang coal mine[J]. Rock and Soil Mechanics，2003，24(4)：549–552.(in Chinese))
[11] 张玉军，唐仪兴. 考虑层状岩强度各向异性的地下洞室平面有限元分析[J]. 岩土工程学报，1999，21(5)：307–310.(ZHANG Yujun，TANG Yixing. 2D Finite element analysis for an underground opening considering the strength-anisotropy of the layered rock mass[J]. Chinese Journal of Geotechnical Engineering，1999，21(5)：307–310.(in Chinese))
[12] 张玉军，刘谊平. 层状岩体的三维弹塑性有限元分析[J]. 岩石力学与工程学报，2002，21(11)：1 615–1 619.(ZHANG Yujun，LIU Yiping. 3D elasto-plastic fem analysis on layered rockmass[J]. Chinese Journal of Rock Mechanics and Engineering，2002，21(11)：1 615–1 619.(in Chinese))
[13] 黄书岭，徐劲松，丁秀丽，等. 考虑结构面特性的层状岩体复合材料模型与应用研究[J]. 岩石力学与工程学报，2010，29(4)：743–756.(HUANG Shuling，XU Jinsong，DING Xiuli，et al. Study on layered rockmass composite model based on characteristics of structural plane and its application[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(4)：743–756.(in Chinese))
[14] 杨天鸿，师文豪，于庆磊，等. 巷道围岩渗流场和应力场各向异性特征分析及应用[J]. 煤炭学报，2012，57(11)：1 815–1 822.(YANG Tianhong，SHI Wenhao，YU Qinglei. The anisotropic properties analysis of the rock mass surrounding the roadway's in seepage and stress field[J]. Journal of China Coal Society，2012，57(11)：1 815– 1 822.(in Chinese))
[15] 张玉军，刘谊平. 层状岩体抗剪强度的方向性及剪切破坏面的确定[J]. 岩土力学，2001，22(3)：254–257.(ZHANG Yujun，LIU Yiping. Anisotropy of shear strength of layered rocks and determination of shear failure plane[J]. Rock and Soil Mechanics，2001，22(3)：254–257.(in Chinese))
[16] 韩昌瑞，张 波，白世伟，等. 深埋隧道层状岩体弹塑性本构模型研究[J]. 岩土力学，2008，29(9)：2 404–2 408.(HAN Changrui，ZHANG Bo，BAI Shiwei，et al. Research on elastoplastic constitutive model of layered surrounding rockmass of a deep buried tunnel[J]. Rock and Soil Mechanics，2008，29(9)：2 404–2 408.(in Chinese))
[17] 王泳嘉，李占才. 横观各向同性体平面问题的不连续位移法[J]. 岩石力学与工程学报，1989，8(2)：127–140.(WANG Yongjia，LI Zhancai. Diseontinuity displacement method of plane problem for transverse isotropic body[J]. Chinese Journal of Rock Mechanics and Engineering，1989，8(2)：127–140.(in Chinese))
[18] 鲁海峰，姚多喜，梁修雨，等. 采动底板横观各向同性岩体应力解析解[J]. 地下空间与工程学报，2013，9(5)：1 051–1 056.(LU Haifeng，YAO Duoxi，LIANG Xiuyu，et al. Analytical solution of stress in a transversely isotropic floor rock mass under mining[J]. Chinese Journal of Underground Space and Engineering，2013，9(5)：1 051–1 056.(in Chinese))
[19] 鲜学福，谭学术. 层状岩体破坏机制[M]. 重庆：重庆大学出版社，1989：122–136.(XIAN Xuefu，TAN Xueshu. Layered rock mass failure mechanism[J]. Chongqin：Chongqin University Press，1989：122–136.(in Chinese))
[20] SALAMON M D G. Elastic moduli of stratified rock mass[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1968，5(6)：519–527.
[21] DONATH F A. Experimental study of shear failure in anisotropic rocks[J]. Geological Society of America Bulletin，1961，72(6)：985–989.
[22] HOEK E. Strength of jointed rock masses[J]. Geotechnique，1983，33(3)：187–223.
[23] ATTEWELL P B，SANDFORD M R. Intrinsic shear strength of a brittle，anisotropic rock—I：Experimental and mechanical interpretation[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1974，11(11)：423–430 |
| [1] |
LI Botao1, 2, 3, TAN Yuxuan1, LIN Haifei4, 5*, WEI Jianping1, 2, 3, ZHANG Hongtu1, 2, 3, LI Shugang4, 5, WEI Zongyong4, 5, WANG Pei4, LUO Rongwei4, LIU Yanwei1, 2, 3. Mechanical properties and mesoscopic damage evolution of coal under liquid-nitrogen freezing at different initial temperatures[J]. , 2026, 45(6): 1757-1772. |
|
|
|
|
2014, Vol. 33 
