从昌平井体应变、水位对地震波的响应特征求算含水层的Skempton常数

Calculating B value of aquifer from volume strain and water level response to seismic waves at Changping seismic station

以理想孔隙弹性介质线性孔隙弹性理论为基础,利用井含水层系统孔隙压力变化与体应变之间的数学表达式.以2004年12月26日苏门答腊MS8.7(根据中国地震台网中心目录)地震波引起的昌平地震台水位和体应变波动资料为例,分别从时间域和频率域分析了水位与体应变之间的相互关系,并计算出地震波通过含水层时引起的水位波动对体应变的响应系数,给出了一种估算Skempton常数B的方法,为求解含水层特性提供了途径.

Based on linear poroelastic theory of ideal poroelastic media, we apply the mathematic expression between pore pressure and volume strain for well-aquifer system to analyzing the observed data of water level and volume strain changes aroused by Sumatra Ms8. 7 （determined by China Seismic Networks Center） seismic waves at Changping, Beijing, station on December 26, 2004 from both time and frequency domain. The response coefficients of water level fluctuation to volume strain are also calculated when seismic waves were passing through confined aquifer. A method for estimating Skempton constant B is put forward, which provide an approach for understanding of the characteristics of aquifer.