有限元在河北平原区构造应力场与地裂缝分布研究中的应用

The application of the finite element method in the study of tectonic stress-field and the ground fissures in Hebei plain

构造应力是地壳活动和形变的原动力 ,构造地裂缝实际上是在构造背景所提供的区域构造应力作用下 ,地壳深部变形引起地表破裂的一种形迹。研究激发构造性地裂缝产生的构造应力场是查明潜在地裂缝危险区的一种间接手段。主要利用前期河北平原区的易县隆尧两处实测资料 ,通过求解平面应力问题的有限单元法反演河北平原区构造应力场 ,确定最大主应力集中区 ,最大剪应力集中区以探索构造地裂缝的潜在危险区。

The tectonic stress field induces the lithospere′s activity and distortion.In fact the ground fissures are the trails of the crust surface caused by the territory tectonic stress field.In this paper through the finite element method and the real files about YiXian and LongYao getting the original tectonic stress field ,we confirm the major stress and find the concentrated areas.Then we can forecast the potential damage areas of the ground fissures.