考虑固结参数变化时砂井地基的非线性径向固结

Non-linear radial consolidation of sand-drained ground with varying volume compressibility and horizontal permeability

传统的砂井地基径向固结理论基于小应变理论,所以假设固结过程中体积压缩系数mv和水平渗透系数kh为常数。然而,固结过程中的mv和kh均随孔隙比e的减小而呈非线性变化。在Hansbo理论基础上,引入普遍压缩方程和普遍渗透性变化方程来分别表示正常固结土的e-σ′和e-kh的非线性变化关系,得到砂井地基非线性径向固结解,并与前者进行对比分析,探讨了非线性固结参数λ和加荷比△p/σ0′对固结过程的影响。结果表明:λ和△p/σ0′是控制砂井地基非线性径向固结过程的两个重要因素。

The conventional radial consolidation theory is based on the small strain theory,so a constant volume compressibility mv and a constant coefficient of horizontal permeability k h are assumed during the consolidation process. However,both the non-linear variations of mv and k h are as a result of reduction in void ratio e during the consolidation process. The non-linear relations of e -σ′ and e -k h for normally consolidated clays can be represented by the general compressibility equation and permeability change equation,respectively. Based on Hansbo's theory,the solution of non-linear radial consolidation of sand-drained ground is deduced and compared with Hansbo's solution. Finally,the influence of non-linear consolidation parameter λ and preloading increment ratio( △p /σ 0′) on the consolidation process is discussed. The results show that λ and △p /σ 0′are two important factors which control the non-linear radial consolidation of sand-drained ground.