非饱和粘土孔隙弹性压力理论

非饱和粘土因存在气体、液体和固体相, 使非饱和土孔隙压力问题变得复杂。一般来说，气体压缩性大，体积变化对土体变形的贡献起主要作用。在简单介绍现在常用的孔隙压力理论后，基于非饱和粘土孔隙压力平衡关系，由混合物理论导出Bishop公式系数X的表达式；以弹性理论为基础，由质量守恒导出非饱和粘土孔隙压力的一般公式,由此得出Skempton公式A，B系数的表达式；还将其各向同性压缩和侧向约束压缩两种情况作了试验证实。

A poroelastic pressure research for nonsaturated clay

In general, when dealing with issues on strength of clay, emphasis should be paid on the stress variation and the relative change in pore pressure. The unsaturated clay due to the existence of the solid, fluid and gas phases is much more complicated to deal with. In this paper applying the elastic deformation theory and theoretical gas law, and assuming the conversation of mass , a general pore pressure formula has been derived; as the result the Skempton formula’s coefficients A and B are obtained. On other hand, applying the mixture theory the Bishop formula’s coefficient X is obtained also. In parallel works, the experimental results have been presented to validate the academic theories. It shows that the capillary action has a little influence on pore coefficient.