Key Laboratory of Safe and Effective Coal Mining,Ministry of Education,Anhui University of Science and Technology,Huainan　 232001,China

为了获得深井软岩巷道的地应力大小和变形规律及其失稳机理,选取千米深井同一水平的2个硐室,进行声发射地应力测试,获得各自相应的地应力大小和方向,发现垂直应力分布差别不大,而水平应力分布差别较大。基于地应力理论计算公式,利用VB6.0编写相应的计算程序,获得相应区域的主应力场的大小和方向,结合现场提供的钻孔柱状图,利用ANSYS建立模型,导入FLAC3D进行数值分析,获得相应的主应力场作用下的硐室围岩变形失稳规律,即岩性较为软弱区域的剪应力集中程度明显、分布范围较广,且围岩破坏越严重。最后发现实测数据与数值模拟结果较为吻合,即破坏严重部位的围岩收敛速度也较大,从而在一定程度上揭示了深部软岩巷道的变形破坏规律,也说明了围岩岩性、剪应力集中程度和范围对整个巷道稳定性起着至关重要作用。

In order to obtain accurate ground stress,deformation and failure law,and instability mechanism in deep soft rock tunnel,the two caverns at the same level in 1 km deep mine were selected for testing acoustic emission technology to gain the value and direction of respective ground stress. The test found that the distribution of vertical stress has a slight difference,and the distribution of horizontal stress had great difference. Based on the theory of in-situ stress cal- culation formula,the corresponding program was written with VB6. 0,for calculating the value and direction of main stress field in corresponding part. Combining with the field drilling histogram,a model was established using ANSYS, and then imported into FLAC3D to make numerical analysis. Therefore,the cavern surrounding rock deformation law and instability mechanism under corresponding main stress field were obtained. It shows that there was larger concen- tration degree and wider distribution of shear stress in weak region,and the destruction of surrounding rock was very serious. Finally,the study found that the field measurement data is in consistent with numerical simulation results. It found that the seriously damaged surrounding rock also has a big convergence rate,which reveals the law of deforma- tion and destruction in deep soft rock roadway and explains that the surrounding rock lithology,the concentration de- gree and the range of shear stress play an important role in the roadway stability.

国家自然科学基金资助项目(51474006；51374114)；

Meng Xiangrui,Peng Rui,Zhao Guangming,et al. Acoustic emission ground stress field testing and mechanism of deformation and instabili- ty in deep soft rock roadway[J]. Journal of China Coal Society,2016,41(5):1078-1086.