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局部膨胀类岩体开挖后的性态特征差异很大,但有一个共同特点就是随时间推移而处于由块体结构特征转化为塑态特征的变态过程之中。它的变态与复盖岩层巨大压力造成地层破坏,使某一类岩体处于塑性特征的情况是有重大差别的。下面根据施工中遇到的含泥类岩体开挖后的情况,讨论一下局部膨胀岩体内井巷的锚喷支护问题。一、膨胀压力的概念膨胀压力系指围岩在某些外界因素作用所及的局部范围内,岩质发生物理—化学变化过程中引起容积增大、开挖断面缩小而
The character of post-excavation of locally expansive rock mass varies greatly, but one common characteristic is that it is in the process of metamorphosis transformed from the structural feature of the block to the plastic feature over time. Its metamorphosis and overburden strata caused by the enormous pressure caused by the destruction of strata, so a certain type of rock mass in the plastic characteristics of the situation there are significant differences. According to the excavation of the mud-containing rock mass encountered in the construction, we will discuss the bolting and shotcreting of the wellways in the local expansion rock mass. First, the concept of inflationary pressure Expansion of pressure refers to the surrounding rock in some of the external factors within the scope of the role of physical and chemical changes in the rock caused by the volume increases, the excavation of the reduced cross-section