论文部分内容阅读
随着矿山建设的发展,近年来不少井筒和巷道穿过软弱岩层,由于软岩的塑性变形较大,故传到支护结构上的荷载很大,使支护产生很大的变形甚至招致结构的破坏,这主要是由于设计取用的荷载偏小或者是没有采用合理的施工方法。 在塑性变形大的软弱岩层中,支护结构上所受的荷载,再不能应用挡土墙理论或冒落拱理论来计算确定。它是由于原岩应力状态破坏(开挖造成的)后,以应力重分配的
With the development of mine construction, in recent years, many wellbores and tunnels pass through soft rock formations. Due to the large plastic deformation of soft rock, the load on the supporting structure is so great that the deformation of the support structure is greatly affected Structural damage, mainly due to the design load is too small to take or not using a reasonable construction method. In the plastic deformation of large soft rock, the load on the support structure, and then can not be applied to the theory of retaining walls or arching arch calculation to determine. It is due to the original rock stress state damage (caused by excavation), the stress redistribution