基于损伤理论的圆形巷道围岩应力场分析

Analysis of stress field of rock surrounding circular roadway based on damage theory

由于巷道掘进破坏了原岩地应力场,使围岩应力重新分布,应力集中区的高应力造成巷道变形破坏。特别是布置在高地应力区的巷道变形破坏更加严重。因此必须合理准确地计算巷道围岩应力场,为巷道变形破坏计算及稳定性分析提供理论依据。岩体内部存在微裂纹,其发生、扩展、并合,决定了岩石材料的宏观力学性能,因此巷道围岩应力场的计算应该考虑岩石材料的损伤特性。本文基于损伤理论计算得到的不同地应力情况下的圆形巷道围岩应力场,计算结果与实际情况符合得较好。

Because the natural stress field is changed due to tunneling roadway, a stress concentration area appears in rock of surrounding roadway that cause roadway deformation or destruction. Specially, it is much more serious when the roadway is in an area of high natural stress. Therefore, the calculation of the stress field of rock surrounding roadway must be reasonable and accurate; it can provide a theoretical foundation for the calculation of deformation or destruction and stability analysis of roadway. A lot of micro-crackle exists in rock mass; the macroscopically mechanical properties of rock material depend on its emerging, expanding and combining determines. So the rock damage property must be considered. The stress fields of rock surrounding circular roadway were obtained under different natural stress situations based on the damage theory; the results are consonant with practical situation well.