基于遍布节理模型的深埋巷道稳定性分析

为研究深部开采矿山不同节理倾角对巷道稳定性的影响，建立了不同节理倾角的巷道模型，基于遍布节理本构模型进行了巷道稳定性分析。以应力、位移以及塑性区范围来定义稳定性分析指标，将其作为评估巷道稳定性影响的基础。通过分析发现：随着节理倾角的变化，巷道顶板下沉值、底板底鼓值呈下降趋势，而帮壁收敛率变化较小；应力集中系数随着节理角度的增大而增大，且集中区向巷道集中，集中区域面积减小；巷道周边塑性区分布与节理方向基本呈正交分布关系，塑性区分布先是在巷道顶板聚集，随着节理倾角的增大向两帮转移，塑性区分布范围受节理倾角影响明显。因此，在深部巷道支护时需要考虑各向异性的影响。

Stability Analysis of Deep Buried Tunnel based on Ubiquitous-joint Model

In order to investigate the influence of different joint angles on the tunnel stability in deep mining process，a tunnel model with different joint angles was established，and the analysis of tunnel stability based on the ubiquitous-joint constitutive model was carried out.The stability analysis index，which served as a basis for evaluating the influence of tunnel stability，was defined in terms of stress，displacement and plastic zone.It was found that with the change of joint angle，the roof sag and the floor heave of the tunnel were both decreased，while the change of wall convergence was small.The stress concentration increased with the increasing joint angle，and the concentrated area was focused on the tunnel，besides the size of the concentrated area was decreased.The plastic zone distribution around the tunnel was orthogonal to the joint and the range was obviously influenced by joint angle.Firstly，the plastic zone distribution was gathered in the roof，and then transferred to two sides with the increasing joint angle，and the range was obviously influenced by joint angle.Therefore，in the process of deep tunnel support，the influence of anisotropy should be taken into consideration.