Based on isotropic linear poroelastic theory and under the undrained condition,we summarize three equations connecting the Skempton’s coefficient B with the groundwater level.After analysis,we propose a method to calculate the Skempton’s coefficient B according to the relationship between water level and tidal strain.With this method we can get the value of B without the earthquake occurrence,which can provide the high frequency waves for research.Besides,we can also get the in-suit Skempton’s coefficient B without the experiment of rock physics.In addition,we analyze the observed data of Changping station recorded in groundwater monitoring network(abv.,GMN)before and after the Wenchuan MS8.0 with this method,and find out there’s a slight change of the value of B after the seismic waves passed by,which implies that the propagation of seismic waves may have brought some variations to the poroelastic medium of the well.
