Effective stress cell for direct measurement of effective stress in saturated soil

Abstract

The present disclosure provides an effective stress cell for direct measurement of effective stress in saturated soil. The effective stress cell comprises a sensing diaphragm, a porous diaphragm, a connector and a strain sensor. The porous diaphragm allows pore-water to enter the interior space between the sensing diaphragm and the porous diaphragm to provide complete balance of pore-water pressures in the front and back of the sensing diaphragm. Thus, the effective stress cell can directly and accurately measure the effective stress in saturated soil using only one diaphragm at one location without measuring pore-water pressure. 本公开提供了一种用于直接测量饱和土中的有效应力的有效应力盒。有效应力盒包括感测膜片、多孔膜片、连接构件和应变传感器。多孔膜片允许孔隙水进入感测膜片和多孔膜片之间的内部空间，以在感测膜片的外表面和内表面实现孔隙水压力的完全平衡。因此，有效应力盒可以在一个位置仅使用一个膜片来直接而准确地测量饱和土中的有效应力，而无需测量孔隙水压力。