水致动压巷道失稳过程与安全评判方法研究

Study on Water-Caused Instability Process of the Dynamic Pressure Roadway and Safety Assessment

利用数值计算方法模拟了动压巷道遇水作用后围岩位移场和渗流场演化的阶段性规律和变形失稳过程,分析了巷道初期支护稳定但随动压反复作用与水逐渐渗入围岩呈现"泥化-变形-再泥化-失稳"的规律,指出软弱夹层遇水泥化是导致动压巷道失稳的主要诱因.利用层次分析法和计算机VB程序建立了针对该类巷道安全性的评判方法和判定程序,提出了水作用下动压巷道的强化控制技术.工程实例表明,必须加强对水的治理才能保持动压巷道稳定性.

This paper simulates the rules of displacement field and seepage field deformation and instability process of surrounding rock in dynamic pressure roadway under water action, and analyzes the stage rule of the regularity ＂pelitization-deformation-pelitization again-instability＂ of surrounding rock, which is caused by the repeated actions of dynamic pressure and gradually infiltrated water after the initial stability of roadway supporting. On the basis of this, we point out that the encountering of weak intercalation and water is the key factor affecting the instability of dynamic pressure roadway. In addition, the safety assessment method about this kind of roadway is established by the analytic hierarchy process and computer VB program. Further more, the enhanced control techniques of dynamic pressure roadway under water is proposed. Engineering project shows that the measures of water controlling must be taken in order to effectively keep the stability of the dynamic pressure roadway.