高水平压力作用下洞室围岩变形与破坏
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摘要
为揭示高轴向水平压力作用下洞室围岩变形与破坏规律,研究了模型介质断裂形态,指出模型裂缝存在剪切和拉伸两种形式;采用锯齿形岩石模型和极限应变破坏准则,推导了洞室围岩的应力场,定量分析了试验结果;通过与试验对比,证明了解析的正确性。研究表明,在高轴向水平压力作用下,洞周介质会产生间隔的拉伸裂缝,形成分层断裂现象。拉伸裂缝的几何形状逐渐趋于圆形,每形成一道拉伸断裂,模型等效于形成一个受支护作用的洞室,随着等效洞室半径的增大,其受到的支护力迅速增大,使得分层断裂现象局限在一定范围内。可为深部防护工程设计提供参考。
Under high axial direction horizon pressure,the medium of tunnel model presents multi-layered failure.The fracture shape of enclosing rock mass were studied and the failure of the model medium was proved to be in the patterns of tension and shear.By the hackly rock mass model and the ultimate strain failure criteria,the stress field of the enclosing rock mass was deduced.Contrasted with the test result,the solution was proved to be correct.The analytical result shows that the tension fracture will repeatedly occur under high axial compression stress,causing layered failure,that the geometry of tension fracture goes to roundness gradually,that when a new tension fracture is taking shape,the model is equal to a new tunnel with supporting,and that with the increment of the tunnel radial,the supporting force grows rapidly,which makes the layered failure localized in a certain range.The analytic method can offer valuable reference to protective engineering design in deep.
Under high axial direction horizon pressure,the medium of tunnel model presents multi-layered failure.The fracture shape of enclosing rock mass were studied and the failure of the model medium was proved to be in the patterns of tension and shear.By the hackly rock mass model and the ultimate strain failure criteria,the stress field of the enclosing rock mass was deduced.Contrasted with the test result,the solution was proved to be correct.The analytical result shows that the tension fracture will repeatedly occur under high axial compression stress,causing layered failure,that the geometry of tension fracture goes to roundness gradually,that when a new tension fracture is taking shape,the model is equal to a new tunnel with supporting,and that with the increment of the tunnel radial,the supporting force grows rapidly,which makes the layered failure localized in a certain range.The analytic method can offer valuable reference to protective engineering design in deep.
引文
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[2]SHEMYAKIN E I,FISENKO G L,KURLENYA.MV.Zonal disintegration of rocks around undergroundworkings,Part:theoretical concepts[J].Journal ofMining Science,1987,23(1):1-5.
[3]METLOV L S,MOROZOV A F,ZBORSHCHIK MP.Rock failure physical foundations of mechanism ofzonal rock failure in the vicinity of mine working[J].Journal of Mining Science,2002,38(2):150-155.
[4]王明洋,宋华,郑大亮,等.深部巷道围岩的分区破裂机制及“深部”界定探讨[J].岩石力学与工程学报,2006,25(9):1771-1776.WANG Ming-yang,SONG Hua,ZHANG Da-liang,et al.On mechanics of zonal disintegration withinrock mass around deep tunnel and definition of deeprock engineering[J].Chinese Journal of RockMechanics and Engineering,2006,25(9):1771-1776.(in Chinese).
[5]顾金才,顾雷雨,陈安敏,等.深部开挖洞室围岩分层断裂破坏机理模型试验与分析[J].岩石力学与工程学报,2008,27(3):433-438.GU Jing-cai,GU Lei-yu,CHEN An-min,et al.Model test study on the mechanism of the layeredfailure within rockmass around deep tunnel[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(3):433-438.(in Chinese).
[6]王明洋,周泽平,钱七虎.深部岩体的构造和变形与破坏问题[J].岩石力学与工程学报,2006,25(3):448-455.WANG Ming-yang,ZHOU Ze-ping,QIAN Qi-hu.Tectonic deformation and failure problems of deeprock mass[J].Chinese Journal of Rock Machanics andEngineering,2006,25(3):448-455.(in Chinese).
[7]董方庭.巷道围岩松动圈支护理论及应用技术[M].北京:煤炭工业出版社,2001.
[8]刘春生,朱涵,李志国,等.橡胶细集料水泥砂浆基本性能研究[J].混凝土,2005(7):38-42.LIU Chun-sheng,ZHU Han,LI Zhi-guo,et al.Research in the fundamental characteristics of crumbrubber mortar[J].Chinese Journal of concrete,2005(7):38-42.(in Chinese).
[9]于学馥,郑颖人.地下工程围岩稳定分析[M].北京:煤炭工业出版社,1983.
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