用声波法划分坝基断层影响带的现场测试研究

The Sound Wave Test on Faults in the Dam Foundation

黄河李家峡水电站工地现场测试中，采用全新的抗干扰声波测量系统和防止测量孔坍塌的新方法。综合考虑声波的时域和频域特性，利用实测资料编绘出被测岩体波速和主频的综合特性曲线，据此划分出断层影响带的界线。并列表示出反映断层带，断层影响带及围岩的强度，变形特性及完整性的动力参数。为大坝的稳定分析及断层处理提供了依据。

This paper introduces a new anti-interference sound-wave surveying system and a newmethod of anti-collaption measuring holes adopted in the insitu test at the site of Lijiaxia Hydroelectricpower plant on the Yellow River.In considering the behavjors of the time and frequency domains ofsound waves comprehensively,the integrated feature curves of wave velocity and master frequency ofrock mass to be measured are plotted using the actual testing data.On the basis of which,theboundary lines of the fault zones are drawn and also the table is listed including the dynamicparameters related to strength,deformation and integraty characteristics reflecting the effects of faultzone,fault influencing zone and surrounding rock,thus providing the base for the analysis of the damstability and fault treatment.