上海及其邻区潜在地质灾害的活动构造背景  

Active Tectonic Background of Potential Geological Hazards in Shanghai and Its Neighbouring Areas

作　　者：周积元[1] 高灯亮[1] 段光贤[1] 沈爱君 

机构地区：[1]同济大学地下建筑与工程系

出　　处：《同济大学学报（自然科学版）》1995年第3期326-332,共7页Journal of Tongji University:Natural Science

摘　　要：分析了上海及其邻区的２００多个钻孔资料，完成了两条第四系构造钻孔剖面及两条长距离氧浓度探测剖面从而初步揭示出发育于上海及其邻区第四系松软盖层内的“韧性剪切构造”．上覆盖层的“冷剪切带”是下伏基岩脆性断裂带新构造运动期东西向引张与伸展作用的产物．基岩与盖层的物理力学性质差别导致基岩的脆性破裂与盖层的“韧性”剪切变形．初步建立了上海及其邻区楔形断裂系统前锋构造变形的数学物理模型，应用土力学基本原理及有限差分数值方法定性地讨论了上海及其邻区的楔形断裂系统前锋受控于“楔进”与“退出”这两个基本运动过程的变形位移及其地质灾害意义．In this paper, the information coming from more than two hundred drill holes has been analyzed, meanwhile the tWo profiles of the Quaternary structure drill holes and the two probing profiles of radon concentration with long distance have been also completed. Thus the 'cold shear structure' developed in the Quaternary loose covering layer in Shanghai and its neighbouring areas has been initiatively revealed. The zone of ductile shear in the upper covering layer is the product of tensile and stretching effects from the east to the W.est which occurred in the zone of brittle fracture of the underlying bedrock during the period of neotectonic movement. The difference of physical properties between the bedrock and the covering layer can result in the brittle fracture of bedrock and the deformation of ductile shear of the covering layer. The mathematical-physical model has been built in this paper, which can reflect the tectonic deformation in the forward of the wedge-shaped fracture system in Shanghai and its neighbouring areas. By using the basic principle of soil mechanics and numerical method of finite difference, the authors have also discussed the deformed displacement of the course of two basic movements such as the wedge-shaped going forward and coming back which control the former of the wedge-shaped fracture system of Shanghai and its neighbouring areas and the meaning of geological hazards.

关 键 词：地质灾害 活动构造 楔形断裂系统 上海 滨太平洋 

分 类 号：P553[天文地球—构造地质学]