德令哈地震台分量钻孔应变干扰分析

使用德令哈地震台钻孔水位和黑石山水库水位记录数据,与德令哈钻孔应变观测数据进行相关分析;采用集中载荷模型计算水库负载作用对钻孔应变观测的理论干扰值,与实际观测值进行对比。结果显示,水库蓄水对钻孔应变观测造成严重干扰;水库负载作用与渗透作用对钻孔应变观测影响较小,水库水位变化导致周围岩体所受水压作用出现变化,可能是影响钻孔应变观测的主要因素。

Analysis of interference characteristics of borehole strain at Delingha Seismic Station

In this article we have analyzed the correlation between the data of the borehole water level and Heishishan reservoir water level and borehole strain observation data at Delingha Seismic Station. Through the concentrated load model we have calculated the interference values of reservoir loads on borehole strain observation, which are compared with the observed value. The results show that reservoir impounding has caused serious interference to borehole strain observation. Reservoir loads and permeation have less effect on the borehole strain observation. Reservoir water level changes lead to changes in the hydraulic pressure of the surrounding rock mass, which may be the main factor influencing the borehole strain observation.