降雨、地下水位对大蜀山台地电阻率和体应变的干扰分析

INTERFERENCE ANALYSIS OF RAINFALL,WATER LEVEL ON EARTH RESISTIVITY AND BODY STRAIN IN DASHUSHAN STATION

分析了大蜀山台体应变、地电阻率Ps观测数据。两个手段受到地下水位、降雨等因素影响，且干扰特征相似，短周期成分主要受降雨影响，体应变、地电阻率对降雨响应即时；长周期主要受到地下水位影响，年变化形态和水位变化趋势基本一致。应用大蜀山台体应变和地电阻率NE、Ns、NW向2012～2014年日均值观测资料与钻孔水位数据进行相关分析，体应变和水位呈正相关变化，相关性达到0．8以上；地电阻率与水位呈反相关，Ns向相关性在0．4以上，且相关性呈现逐年上升趋势，NW向相关性在0．7以上，NE向地电阻率和水位相关性较低，且呈现逐年下降趋势。

Through analysis on body strain and earth resistivity in Dashushan, we found both obser- vation method were affected by water level and rainfall. The interference features are similar. In a short period , they mainly affected by rainfall and respond timely. Over a long period , they mainly af- fected by underground water, their annual change is similar to underwater annual change. They used data of body strain from 2012 to 2013, earth resistivity and underwater to analysis correlation. The body strain and underwater were positively Their correlation reached more than 0.8. The earth resis- tivity and underwater were relevant change. The correlation of earth resistivity in NS direction reached more than 0.4 and showed a increase trend year by year. The correlation of earth resistivity in NW direction was over 0.7. But the correlation between NE direction and water level is low and showed a decrease trend year by year. We use the regression method to extract the real information by eliminating water interference of body strain and earth resistivity.