不同埋深条件下直墙拱顶巷道破裂的数值试验
|
摘要
为研究不同埋深条件下直墙拱顶巷道围岩破裂形态,采用RFPA2D软件进行了数值模拟试验。通过数值试验发现:不同埋深条件下的巷道围岩均从巷道的拱脚和墙角处最先发生破坏,且沿拱脚斜向下和沿墙角斜向上扩展,最终导致巷道两帮围岩破裂失稳;同时由于深部巷道围岩的荷载较大,破坏裂缝也从巷道两帮扩展到拱顶和底板。通过分析巷道围岩应变数据,发现围岩体内径向拉应变是造成巷道围岩破坏的主要原因。该数值试验结果与有关物理试验结果具有一致性,能进一步丰富深部岩体破裂方面的研究成果,更好地指导深部地下空间的开发和应用工作。
In order to study the fracture form of surrounding rock of straight-walled vault tunnel under different burial depths,the numerical simulation tests are carried out by RFPA software.The results of numerical test show that the surrounding rock of tunnel under different burial depths are firstly destroyed from the arch foot and the corner of tunnel,then the cracks spread diagonally downwards along arch feet and diagonally upward along the corners of the wall,and eventually the fracture and instability of both side walls of surrounding rock in tunnel occurred;meanwhile,due to the large load of surrounding rock in deep tunnel,the cracks also extend from the both sides of tunnel to the arch top and the bottom floor of tunnel.Through the strain data analysis of surrounding rock,it is found that the radial strain of surrounding rock is the main cause of the fracture of surrounding rock in tunnel.The numerical test results are consistent with the related physical test results,which can further enrich the research results of fracture of deep rock mass and better guide the development and application of deep underground space.
In order to study the fracture form of surrounding rock of straight-walled vault tunnel under different burial depths,the numerical simulation tests are carried out by RFPA software.The results of numerical test show that the surrounding rock of tunnel under different burial depths are firstly destroyed from the arch foot and the corner of tunnel,then the cracks spread diagonally downwards along arch feet and diagonally upward along the corners of the wall,and eventually the fracture and instability of both side walls of surrounding rock in tunnel occurred;meanwhile,due to the large load of surrounding rock in deep tunnel,the cracks also extend from the both sides of tunnel to the arch top and the bottom floor of tunnel.Through the strain data analysis of surrounding rock,it is found that the radial strain of surrounding rock is the main cause of the fracture of surrounding rock in tunnel.The numerical test results are consistent with the related physical test results,which can further enrich the research results of fracture of deep rock mass and better guide the development and application of deep underground space.
引文
[1] ADAMS G D,JAGER A J.Petroscopic observations of rock fracturing ahead of stope faces in deep-level gold mines[J].Journal of the South African Institute of Mining and Metallurgy,1980,80(6):204-209.
[2] SHEMYAKIN E I,FISENKO G L,KURLENYA M V,et al.Zonal disintegration of rocks around underground workings,PartⅢ:theoretical concepts[J].Journal of Mining Science,1987,23(1):1-6.
[3]李术才,王汉鹏,钱七虎,等.深部巷道围岩分区破裂化现象现场监测研究[J].岩石力学与工程学报,2008,27(8):1545-1553.LI Shucai,WANG Hanpeng,QIAN Qihu,et al.In-situ monitoring research on zonal disintegration of surrounding rock mass in deep mine roadways[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(8):1545-1553.
[4]陈旭光,张强勇,杨文东,等.深部巷道围岩分区破裂现象的试验与现场监测对比分析研究[J].岩土工程学报,2011,33(1):70-76.CHEN Xuguang,ZHANG Qiangyong,YANG Wendong,et al.Comparative analyses of model tests and in-situ monitoring of zonal disintegration of rock mass in deep tunnels[J].Chinese Journal of Geotechnical Engineering,2011,33(1):70-76.
[5]周小平,周敏,钱七虎.深部岩体损伤对分区破裂化效应的影响[J].固体力学学报,2012,33(3):242-250.ZHOU Xiaoping,ZHOU Min,QIAN Qihu.Influence of rock damage on zonal disintegration around deep circle tunnels[J].Chinese Journal of Solid Mechanics,2012,33(3):242-250.
[6]周小平,毕靖,钱七虎.动态开挖卸荷条件下深埋圆形洞室各向同性围岩的分区破裂化机理[J].固体力学学报,2013,34(4):352-360.ZHOU Xiaoping,BI Jing,QIAN Qihu.The zonal disintegration mechanics of isotropic rock masses around a deep circular tunnel subjected[J].Chinese Journal of Solid Mechanics,2013,34(4):352-360.
[7]唐春安,张永彬.岩体间隔破裂机制及演化规律初探[J].岩石力学与工程学报,2008,27(7):1362-1369.TANG Chunan,ZHANG Yongbin.Discussion on mechanism and evolution laws of fracture spacing in rock mass[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(7):1362-1369.
[8]袁亮,顾金才,薛俊华,等.深部围岩分区破裂化模型试验研究[J].煤炭学报,2014,39(6):987-993.YUAN Liang,GU Jincai,XUE Junhua,et al.Model test research on the zonal disintegration in deep rock[J].Journal of China Coal Society,2014,39(6):987-993.
[9]王汉鹏,李术才,薛俊华,等.深部岩巷分区破裂围岩稳定性控制方法及应用[J].岩土力学,2014,35(7):1957-1964.WANG Hanpeng,LI Shucai,XUE Junhua,et al.Control methods of stability of zonal disintegration surrounding rock in deep rock roadway and its application[J].Rock and Soil Mechanics,2014,35(7):1957-1964.
[10]王汉鹏,薛俊华,李建明,等.隧洞开挖围岩动态卸载响应特征模拟研究[J].岩土力学,2015,36(5):1481-1487.WANG Hanpeng,XUE Junhua,LI Jianming,et al.Simulation of dynamic response of surrounding rock under the tunnelinginduced unloading[J].Rock and Soil Mechanics,2015,36(5):1481-1487.
[11]钟波波,张永彬,李宏.基于RFPA2D的岩石裂纹扩展模式的研究[J].武汉理工大学学报,2014,36(2):82-88.ZHONG Bobo,ZHANG Yongbin,LI Hong.Study of mechanisms of crack propagation of rock based on RFPA2D[J].Journal of Wuhan University of Technology,2014,36(2):82-88.
[12]付斌,周宗红,王友新,等.煤岩组合体破坏过程RFPA2D数值模拟[J].大连理工大学学报,2016,56(2):132-139.FU Bin,ZHOU Zonghong,WANG Youxin,et al.Numerical simulation of coal-rock combination body failure process by RFPA2D[J].Journal of Dalian University of Technology,2016,56(2):132-139.
[2] SHEMYAKIN E I,FISENKO G L,KURLENYA M V,et al.Zonal disintegration of rocks around underground workings,PartⅢ:theoretical concepts[J].Journal of Mining Science,1987,23(1):1-6.
[3]李术才,王汉鹏,钱七虎,等.深部巷道围岩分区破裂化现象现场监测研究[J].岩石力学与工程学报,2008,27(8):1545-1553.LI Shucai,WANG Hanpeng,QIAN Qihu,et al.In-situ monitoring research on zonal disintegration of surrounding rock mass in deep mine roadways[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(8):1545-1553.
[4]陈旭光,张强勇,杨文东,等.深部巷道围岩分区破裂现象的试验与现场监测对比分析研究[J].岩土工程学报,2011,33(1):70-76.CHEN Xuguang,ZHANG Qiangyong,YANG Wendong,et al.Comparative analyses of model tests and in-situ monitoring of zonal disintegration of rock mass in deep tunnels[J].Chinese Journal of Geotechnical Engineering,2011,33(1):70-76.
[5]周小平,周敏,钱七虎.深部岩体损伤对分区破裂化效应的影响[J].固体力学学报,2012,33(3):242-250.ZHOU Xiaoping,ZHOU Min,QIAN Qihu.Influence of rock damage on zonal disintegration around deep circle tunnels[J].Chinese Journal of Solid Mechanics,2012,33(3):242-250.
[6]周小平,毕靖,钱七虎.动态开挖卸荷条件下深埋圆形洞室各向同性围岩的分区破裂化机理[J].固体力学学报,2013,34(4):352-360.ZHOU Xiaoping,BI Jing,QIAN Qihu.The zonal disintegration mechanics of isotropic rock masses around a deep circular tunnel subjected[J].Chinese Journal of Solid Mechanics,2013,34(4):352-360.
[7]唐春安,张永彬.岩体间隔破裂机制及演化规律初探[J].岩石力学与工程学报,2008,27(7):1362-1369.TANG Chunan,ZHANG Yongbin.Discussion on mechanism and evolution laws of fracture spacing in rock mass[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(7):1362-1369.
[8]袁亮,顾金才,薛俊华,等.深部围岩分区破裂化模型试验研究[J].煤炭学报,2014,39(6):987-993.YUAN Liang,GU Jincai,XUE Junhua,et al.Model test research on the zonal disintegration in deep rock[J].Journal of China Coal Society,2014,39(6):987-993.
[9]王汉鹏,李术才,薛俊华,等.深部岩巷分区破裂围岩稳定性控制方法及应用[J].岩土力学,2014,35(7):1957-1964.WANG Hanpeng,LI Shucai,XUE Junhua,et al.Control methods of stability of zonal disintegration surrounding rock in deep rock roadway and its application[J].Rock and Soil Mechanics,2014,35(7):1957-1964.
[10]王汉鹏,薛俊华,李建明,等.隧洞开挖围岩动态卸载响应特征模拟研究[J].岩土力学,2015,36(5):1481-1487.WANG Hanpeng,XUE Junhua,LI Jianming,et al.Simulation of dynamic response of surrounding rock under the tunnelinginduced unloading[J].Rock and Soil Mechanics,2015,36(5):1481-1487.
[11]钟波波,张永彬,李宏.基于RFPA2D的岩石裂纹扩展模式的研究[J].武汉理工大学学报,2014,36(2):82-88.ZHONG Bobo,ZHANG Yongbin,LI Hong.Study of mechanisms of crack propagation of rock based on RFPA2D[J].Journal of Wuhan University of Technology,2014,36(2):82-88.
[12]付斌,周宗红,王友新,等.煤岩组合体破坏过程RFPA2D数值模拟[J].大连理工大学学报,2016,56(2):132-139.FU Bin,ZHOU Zonghong,WANG Youxin,et al.Numerical simulation of coal-rock combination body failure process by RFPA2D[J].Journal of Dalian University of Technology,2016,56(2):132-139.