自适应网格加密求解洞室围岩塑性区

在弹塑性交界面上存在应力跳跃。 将应力跳跃值作为加密网格的准则, 不仅可使应力计算精度大幅度提高, 而且可求出塑性区的形状。 针对塑性区求解这一具体问题, 提出了一种修正的网格加密准则。 通过改变影响围岩塑性区的几个主要影响因素, 进行了大量的数值计算, 结果表明所提出的修正加密准则能正确地求出围岩塑性区的形状和大小。

Determination of plastic zones of a cavern by adaptive enriched meshes

There ia a stress jump on the interface between the elastic and the plastic zones. Using the stress jump values as mesh refinement criteria, one can not only greatly improve the accuracy of the stresses calculated but also solve the form of plastic zone. For the specific problems of tracing the interface between the two zones, a modified mesh refinement criterion is presented. By changing several main factors that effect the shape and size of plastic zone, a lot of numerical computations are carried out. The results have shown that the criterion used in this paper is effective for determining the shape and size of the plastic zones of caverns.