地下工程周围岩体能量分析

ENERGY ANALYSIS OF SURROUNDING ROCKS IN UNDERGROUND ENGINEERING

岩石冲击是地下工程开挖过程中的一种灾害,它在抛掷岩石过程中,表现出能量释放现象。因此,必须分析地下工程开挖过程中的能量变化。分析了原岩弹性应变能、隧道四周围岩应变能的释放与集聚情况、围岩应变能转移的条件、地下工程开挖前方的围岩能量变化以及该能量的突然变化。指出围岩的能量达到该点的极限储存能时,多余的能量将释放,造成塑性变形或破碎,并自动向深部转移。如果释放的能量特别大,又不能向深部转移,将造成岩石冲击。这一新理论应用于岩石冲击防治中,取得了成功。

Rock burst is a kind of catastrophe during the excavation in underground projects. It is a process of energy release and rock block casting. So the energy change in the surrounding rocks of underground projects must be analyzed. The elastic strain energy of rocks before excavation, energy release and gathering in surrounding rocks, the condition of energy transfer, and the energy variation of rocks in front of cutting face are studied. When the strain energy reaches its limit energy storage in one point, the surplus energy will be released and produce plastic deformation, or rock fracture, and the remaining energy will shift into the deeper part of the rock. If the energy is especially large and can not shift into the depths, the rock burst will take place. This theory has been successfully used to prevent rock burst.