关键词: 应力-渗流耦合;井壁混凝土;渗透压;峰值强度;割线弹性模量;渗透率

Abstract: In order to research mechanical property of shaft lining concrete under stress-seepage coupling, two kinds of strength grade shaft lining concrete are prepared,and design osmotic pressure is 4 MPa,6 MPa,8 MPa, 10 MPa, three-axis coupling experiments are carried out.The result shows: under the same confining pressure, with the increase of seepage pressure, peak strength of shaft lining concrete decreases and secant modulus decreases;with the increase of confining pressure,peak strength of shaft lining concrete increases with the increase of confining pressure.Osmotic pressure has some influence on peak strength,but the dominant effect is confining pressure.The change of permeability in the whole process of stress and strain of shaft lining concrete is divided into four stages, the corresponding conceptual model is established to describe the mechanical behavior of each stage.

Key words: stress-seepage coupling;shaft lining concrete;osmotic pressure;peak strength;secant modulus;permeability