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在我国许多大中型水利建设的坝址勘察过程中,往往遇到断层破碎带,由于破碎带的存在,不但降低了建筑物基础的稳定性而且沿破碎岩石往往会发生坝基渗漏。因此,在选择高坝坝址时,对坝址基岩内的断层破碎带的研究是很慎重的。除去获得破碎带内部物质的性质、胶结状况、力学性质及渗漏性外,必须确定断层破碎带的方位(走向、倾向、倾角)。只有在掌握上述资料的基础上,才能就断层对基础稳定性作出圆满的工程地质评价。根据许多大中型坝址勘察工作的实践证明,在河
In many large and medium-sized water conservancy projects in our country dam site survey, often encounter fault fracture zone, due to the existence of broken belt, not only reduces the stability of the building foundation and along the broken rock tend to occur dam seepage. Therefore, when selecting the dam site, the study on the fault zone in the bedrock of the dam site is very cautious. In addition to obtaining the properties of the material inside the broken zone, the condition of cementation, the mechanical properties and the leakage, the orientation (direction, tendency, dip) of the fault zone must be determined. Only on the basis of the above information can we make a satisfactory engineering geological assessment of the stability of the foundation. According to many large and medium-sized dam site investigation proved that in the river