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深井巷道围岩扰动应力场与开挖扰动区的形成密切相关。然而,受现场地质条件和监测技术制约,尚难以准确获得围岩扰动应力的演化过程。为此,首先通过原位监测得到深井巷道围岩开挖扰动区的演化特征;然后,基于监测结果利用反分析的方式构建能较为准确地模拟围岩开挖扰动区演化特征的数值模型;最后,通过这一模型分析了深井巷道掘进过程中围岩扰动应力场的演化特征。研究结果表明:当工作面未掘进至监测断面时,由于工作面前方岩体空间约束,测点应力值基本没有变化;当工作面掘进过监测断面后,巷道帮部、顶底板的主应力大小和方向均发生了变化;通过对比扰动应力场与原位监测得到的开挖扰动区的演化特征,发现两者的部分演化特征较为相似。
The perturbation stress field of surrounding rock of deep mine roadway is closely related to the formation of excavation disturbance zone. However, due to the constraints of on-site geological conditions and monitoring techniques, it is still difficult to accurately obtain the evolutionary process of disturbance of surrounding rock. Therefore, firstly, the evolvement characteristics of disturbance zone of surrounding rock excavation in deep mine roadway are obtained by in situ monitoring. Then, based on the monitoring results, a numerical model which can simulate the evolvement characteristics of disturbance zone of surrounding rock excavation is constructed by back analysis. Finally, Through this model, the evolution characteristics of perturbation stress field of surrounding rock during deep tunneling are analyzed. The results show that when the working face is not driven to the monitoring section, the stress value at the measuring point remains basically unchanged due to the constraint of the rock mass in front of the working face. When the working face passes through the monitoring section, the principal stress And the direction of the excavation have been changed. By comparing the evolution of perturbed stress field with in-situ monitoring of disturbed excavation area, it is found that some of the evolutionary characteristics of the two are similar.