Mechanism analysis of phenomenon of zonal disintegration in deep tunnel model test under high geostress
Mechanism analysis of phenomenon of zonal disintegration in deep tunnel model test under high geostress
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DOI：
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发表时间：
2011
影响因子：
1.5
通讯作者：
Zhang Qiangyong
中科院分区：
文献类型：
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作者：
Zhang Qiangyong
以模型试验中发现的带状崩解为背景，利用经典的Fenner公式对圆形隧道的应变场进行了研究。在极限平衡边界处存在径向应变不连续和弹性变形能集中的现象。与开口同心的圆形裂纹的形成是由于应变场的不连续而导致的极限平衡区和弹性区之间的断裂和分离。带状解体是最终平衡带在分离后向更深层的岩体扩展的结果。分析结果解释了围岩应变和位移随距离洞室增大而变化的非单调规律，并得出了裂隙带半径的计算公式，表明各半径之间存在等比关系。它的大小与地应力状态和围岩参数相对应。将模型试验中的参数计入公式中，得到n=1.1。经检验，该模型与拆解模型中裂隙带的形态特征吻合较好。
At the background of zonal disintegration was found in the model test,the strain field of the circular tunnel was studied by using the classical Fenner formula. The discontinuity of the radial strain and the concentration of elastic deformation energy were found at the ultimate balance boundary. The formation of the circular crack which is concentric to the opening is the rupture and separation between the ultimate balance zone and the elastic zone caused by the discontinuity of the strain field. Zonal disintegration is the result of ultimate balance zone expanding to deeper rock mass after the separation. The analysis results explain the non-monotonic under changing laws of the strain and displacement in surrounding rock mass with the distance to the cavity increasing;and the formula of radius of the fractured zones was got and it showed that there exist the equal ratio relations between the radiuses. The value of it was corresponding to the geostress state and the parameter of the surrounding rocks. Taking the parameters in the model test into the formula,it obtained that n =1.1. It matches well with the shape character of the fractured zones in the disassembled model after test.