摘要
对淮南矿区3种典型人工冻结粘土力学特性的研究表明:钙质粘土力学性能最差;冻结粘土的单轴强度、变形模量和蠕变强度均随温度降低而增加,特别是当冻土温度低于-10℃时,冻结粘土强度随温度降低而剧烈增加,但温度的变化对泊松比影响较小,蠕变状态方程可用形如ε=A(T)σBtC的幂函数表示;在没有补给水源的情况下,其冻胀力可达0.8MPa,冻胀率小于5%,深层粘土的冻胀性小于浅层粘土。
Mechanical performance study of three kinds of typical artificial frozen clay shows that of calcic-clay is the worst. Although solo-axial intensity, strain module and creep intensity are increasing with temperature decreasing of these frozen clays. Especially, when its temperature is below -10 ℃,the frozen clays' intensity has a sharp increase, there are little influence to its' Possion ratio. The creep state equation can be written as ε=A(T)σ~Bt^C. If there is no outer water resource, the frost heave stress of the clays can reach 0.8 MPa, but its' frost heave ratio no more than 5%. The result also indicates that the frost heave performance of clay in deep is less than that in shallow earth.
基金
安徽省自然科学基金资助项目(01044503)
