深部应力集中区巷道变形规律的模拟研究

Deformation Law Simulation of the Deep Tunnel in Stress Concentration Zone

针对深部应力集中区巷道,采用物理模拟和数值模拟方法,研究其在高应力集中荷载作用下的变形特点。在物理模拟试验中采用数字照相量测技术进行变形分析,获得了巷道变形随时间的变化过程,以及动压作用对巷道变形的影响。在数值分析中采用多线性随动强化材料模型,针对试验结果进行对比计算分析,获得了动压情况下巷道变形、围岩塑性区的变化过程。综合分析得知深部高应力集中区巷道随时间会发生显著的收敛变形;当荷载增大时,围岩塑性区范围随之扩大,帮部围岩由于应力集中程度较高,其变形较顶底板更为显著。

In allusion to the deep immerged tunnel in the stress concentration zone,physical simulation and numerical simulation has been made in order to study its property of deforming features under high concentrated load. Digital photography-based deformation measurement technique was used in the physical simulation, and the relationship between the tunnel deformation and the time, the effect of the load variety on the tunnel deformation were obtained. In the numerical simulation the muhi-linear kinematic hardening material model has been used to establish the material model, and the calculation is carried out in allusion to the result of physical simulation. The change process of the tunnel deformation and the plastic zone are obtained. The comprehensive analysis showed that the deformation of deep tunnel in stress concentration zoon was significant. While the stress is increased, the plastic zone of the tunnel adjacent rock is enlarged, the deformation of sides is more significant than the roof and floor,since the each side of the tunnel has a higher stress concentration degree.