深井软岩巷道声发射地应力测试及变形失稳机理

发布时间：2018-03-15 12:49

本文选题：深井　切入点：声发射　出处：《煤炭学报》2016年05期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:In order to obtain the in-situ stress, deformation law and instability mechanism of soft rock roadway in deep well, two chambers of the same level in a kilometer deep well are selected to test the in-situ stress of acoustic emission, and the corresponding magnitude and direction of in-situ stress are obtained. It is found that there is little difference in vertical stress distribution and great difference in horizontal stress distribution. Based on the calculation formula of in-situ stress theory and VB6.0, the magnitude and direction of principal stress field in the corresponding region are obtained. Combined with the borehole histogram provided by the site, the model is established by using ANSYS, and the numerical analysis is carried out by introducing FLAC3D, and the deformation and instability law of surrounding rock in the chamber under the action of principal stress field is obtained, that is, the shear stress concentration degree is obvious in the weak area of lithology. It is found that the measured data are in good agreement with the numerical simulation results, that is, the convergence rate of the surrounding rock in the seriously damaged area is also larger. Thus, the deformation and failure law of deep soft rock roadway is revealed to a certain extent, and the lithology of surrounding rock and the concentration and range of shear stress play an important role in the stability of the whole roadway.
【作者单位】：安徽理工大学煤矿安全高效开采省部共建教育部重点实验室;
【基金】：国家自然科学基金资助项目(51474006,51374114)
【分类号】：TD322

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