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巷道围岩破坏的原因、范围与形状和场落拱形成的理论根据。正如许多人所指出的一样,巷道开成后,围岩任何一点的新应力超对岩石强度(包括抗压及抗拉强度)就必然破坏,在实际观察中,巷道的破坏情况有三种:①两帮稳定,顶板不稳定(破坏),②两帮及顶板都不稳定(破坏)和③两帮、顶板和底板都不稳定(破坏)。茲将三种不同情况的理论分析列下。(1)两帮稳定,顶板不稳定:这个现象是地下巷道,特别是岩石比较不软的巷道破坏的一种普遍现象。
The reason, scope and shape of the roadway surrounding rock destruction and the theoretical basis for the formation of the arch of field. As many have pointed out, after the tunnel is opened, any new stress on the surrounding rock will inevitably damage the rock strength (including compressive strength and tensile strength). In actual observation, there are three types of damage in the roadway: Two stable, roof instability (destruction), ② both the top and the roof are unstable (damage) and ③ two, roof and floor are unstable (destruction). Here are three theoretical analyzes of different situations. (1) Two stables, unstable roof: This phenomenon is a common phenomenon of underground tunnels, especially those with less soft rocks.