应力-渗流耦合作用下井壁混凝土力学性能试验研究

为研究应力-渗流耦合作用下井壁混凝土力学性能变化规律,配制出两种强度等级井壁混凝土,设计渗透压为4 MPa、6 MPa、8 MPa、10 MPa,开展三轴耦合渗透性试验.结果表明:相同围压作用下,随着渗透压增大井壁混凝土峰值强度降低、割线弹性模量减小;相同渗透压作用下,随着围压增大井壁混凝土峰值强度增大.渗透压对混凝土峰值强度有一定影响,但起主导影响的是围压.同时将井壁混凝土应力应变全过程渗透率变化情况划分为四个阶段,建立了相应的概念模型用于描述各阶段力学行为.

Experimental Study on Mechanical Properties of Shaft Lining Concrete under Stress-Seepage Coupling

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.