软岩巷道支护荷载的确定方法

通过分析巷道围岩与支护的相互作用原理 ,得出了软岩巷道失稳的原因是由于围岩自承力与支护力不足的结果 .认为一个优化的软岩巷道支护设计应在确保支护稳定的前提下 ,最大限度地释放围岩的能量 ,使以变形形式转化的工程力达到最大 ,同时最大限度地发挥围岩的自承能力 ,使工程支护力达到最小 ,而其关键是确定变形能释放时间和最佳支护时间 .软岩巷道开挖后 ,通常在巷道周围形成塑性软化区和塑性流动区 ,实施支护力就是要控制塑性流动区的范围与发展 ,达到最佳支护时间时的支护荷载为最小支护荷载 ,可以通过塑性软化区和塑性流动区内岩石的重力求得

Method of Support Load Determining of Soft Rock Roadways

Based on the analysis of the interaction principles of surrounding rock and supporting, the model of loop|shape for surrounding rock of soft rock roadways was established. The main reason of rock failure is that rock strength and support load are not high enough for soft rock roadways. The main goal of an optimal supporting design should be to release the energy of surrounding rock and utilize fully its self|supporting ability under the condition of ensuring roadway stability. The key to this is to select the energy releasing time and the optimal supporting time. After the excavation of a roadway, a plastic deformation zone is usually formed around it, so it is the goal of supporting to control the development of the plastic deformation zone. The supporting load for the optimal time is minimal, and it can be gained by calculating the weight of rocks in the plastic deformation zone.