Dept. of Geotechnical Eng. , Tongji Univ. , Shanghai 200092, China;
Dept. of Geotechnical Eng. , Tongji Univ. , Shanghai 200092, China;
No. 4 Research and Design Inst. of Nuclear Industry, Shijiazhuang 050021;
tidal fluctuation; fractured aquifer; hydraulic gradient; time lag; tidal efficiency factor; nuclear power engineering;