软岩巷道围岩破坏特征的中间主应力效应研究

为了研究中间主应力对软岩巷道围岩变形的影响机制,以淮北矿区朱仙庄矿Ⅱ1053工作面软岩运输巷为工程背景,在地应力原位测试的基础上,采用FLAC3D软件构建了不同中间主应力条件的数值计算模型,开展了软岩巷道围岩破坏特征的中间主应力效应研究。结果表明:中间主应力的改变,使巷道开挖后的应力分布、表面位移与塑性区发育情况都呈现一定的阶段性特征,表现出明显的"区间效应"。现场监测数据及钻孔窥视表明,该模型能反映现场实际情况。

Intermediate Principal Stress Effect on Failure Characteristics of Surrounding Rock in Soft Rock Roadway

In order to study the influence mechanism of intermediate principal stress on surrounding rock deformation of soft rock roadway, taking the soft rock transportation lane of Ⅱ1053 working face of Zhuxianzhuang Mine in Huaibei Mining Area as the engineering background, based on ground stress in situ measurement, a numerical calculation model of different intermediate principal stress conditions was established by using FLAC3 Dsoftware, and the effect of intermediate principal stress on the failure characteristics of soft rock roadway surrounding rock was studied. The simulation results show that the change of the intermediate principal stress makes the stress distribution, the surface displacement and the distribution of the plastic zone after the tunnel excavation show a certain stage characteristics, showing obvious "interval effect". The field monitoring and borehole peeping results show that the model can reflect the actual situation in the field.