某水电站坝基G_(23)破碎带对坝体的影响分析

Analysis of Influence of G23 Geological Fracture Zone in the Dam Foundation on the Dam Body of a Hydropower Project

简要介绍了某水电站坝基内G23挤压蚀变破碎带的特征,在此基础上,采用区间有限元法就G23破碎带对坝体的变形和应力进行了初步分析和评价。分析结果表明,由于坝基内G23破碎带的存在,坝体建基面出现了明显的不均匀沉降,使坝体内出现了拉应力,需要对坝基进行工程处理。

This paper gives a brief introduction to the features of the G23 crushed altered fracture zone located within the clam foundation area of a hydropower project and then makes a preliminary analysis and an appraisal of the influence of the G23 fracture zone on settlement and stress of the dam body by using the definite element method. The analysis results indicate that the existence of the G23 fracture zone within the dam foundation area causes significant differential settlement of the construction face on which the dam body lies, which is resulted in tensile stress inside the dam body. It is therefore necessary to give an engineering treatment to the dam foundation.