不良岩层中巷道稳定性分析

A STABILITY ANALYSIS OF DRIFT IN POOR STRATA

本文列举了不良岩层巷道失稳的基本情况，分析了这类巷道失稳的原因，指出松软岩体一方面受地质应力作用，另一方面受开挖时爆破力的扰动，使应力场发生急剧变化，围岩解体流动，造成失稳以致坍塌破坏。文章最后探讨了控制巷道失稳的措施，认为应从提高围岩本身自支持能力入手，控制其解体流动，同时采用新的支护结构，使其在整体上具有较高的承受周围压力的能力。

The author describes the basic situation of unstability of drift in poor strata,analyzes the unstability causes of this kind of drifts, and points out,on the hand,the function, which the soft rockbody was forced by geological stress,and on the other hand the disturbance, which the soft rockbody was suffered from the blasting force in excavating, make the stress field change dramatically,the host rock dismantle arid move, and further the drift so unstable that it will collapse and fall. At last,the author makes an approch to the measures used for controlling the unstability of drift.It is considered that the control of host rock dismantlement and movement should be started from enhancing the self-support capability of host rock. Meanwhile, a new support structure is used to make the host rock, on the whole, have a higher supporting capability for the surrounding pressure.