Numerical and Theoretical Studies on the Mechanical Destabilization of Planes of Weakness, Dynamic Rupture Propagation and Wave Radiation

本课题对软弱面断裂力学进行了理论研究。例如，根据断裂扩展速度，考虑了位于物理性能差异极大的材料之间的弱点平面上的动态断裂扩展。软弱面断裂所产生的波对周围环境、地面和结构的影响已进行了定量评价。以1978年日本仙台市住宅小区宫城县地震引起的动力边坡破坏为具体实例进行了研究。指出这种边坡破坏不仅可能是由地震波的普遍力学特征引起的，而且可能是由日本东北地区当地的地震（构造）条件引起的。

In this research project, a theoretical study on the fracture mechanics of planes of weakness has been promoted. For example, the dynamic fracture propagation on a plane of weakness located between materials with extremely different physical properties has been considered in light of rupture propagation speed. The effect of waves, generated by fracture of planes of weakness, on the surrounding environment, the ground and structures has been quantitatively evaluated. As a concrete instance, the dynamic slope failure generated by the 1978 Miyagi-ken-oki, Japan, earthquake in the residential area of Sendai City has been studied. It has been pointed out that such slope failure may be possibly induced not only by the universal mechanical characteristics of seismic waves but also by the local seismological (tectonic) conditions under the Tohoku region of Japan.