论文部分内容阅读
在松软地层内开挖坑道,围岩常处于弹塑性状态。按弹塑性方法分析坑道围岩的应力和变形。经典的方法是把坑道的形状视为圆形,同时在多数场合下还要假定坑道所处的初始应力状态为静水压力状态,从而使分析和计算大为简化。这种大量采用的方法具有分析简单,思路明确等优点,得到的结果具有明显的规律性,便于分析应用,具有一定的工程意义。当然,这种经典方法所要求的条件是严格的,对于非静水压力、非圆形洞室的弹塑性分析目前尚无精确解。然而,这种非圆形、非静水压力条件却是工程中普遍和大量遇及的情形,有必要加以讨论。
Tunnels are excavated in soft formations, and the surrounding rock is often in an elastoplastic state. Elasto-plastic analysis of the stress and deformation of the surrounding rock of the tunnel. The classic method is to consider the shape of the tunnel as a circle, and at the same time, in most cases, it is assumed that the initial stress state of the tunnel is a state of hydrostatic pressure, which greatly simplifies analysis and calculation. This method, which is widely used, has the advantages of simple analysis, clear thinking, etc. The obtained results have obvious regularity, are easy to analyze and apply, and have certain engineering significance. Of course, the conditions required by this classical method are strict, and there is no exact solution to the elasto-plastic analysis of non-hydrostatic pressure and non-circular holes. However, this non-circular, non-hydrostatic pressure condition is a common and large number of cases encountered in the project and it is necessary to discuss it.