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

在本研究项目中，促进了对薄弱面断裂力学的理论研究。例如，根据断裂传播速度，考虑了位于具有极其不同的物理性质的材料之间的弱平面上的动态断裂传播。定量地评价了弱面破裂产生的波浪对周围环境、地面和建筑物的影响。作为一个具体的例子，1978年日本宫城县冲地震在仙台市住宅区的动态边坡破坏进行了研究。指出这种边坡破坏不仅可能是由地震波的普遍力学特性引起的，也可能是由日本东北地区的局部地震（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.