堆载作用下层状地基固结半解析解  

Semi-analytical solution for consolidation of layered soils under preloading

作　　者：魏焕卫[1] 刘奔奔 WEI Huanwei;LIU Benben(School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,Shandong,China)

机构地区：[1]山东建筑大学土木工程学院,山东济南250101

出　　处：《山东大学学报（工学版）》2023年第1期68-75,共8页Journal of Shandong University（Engineering Science）

基　　金：国家自然科学基金资助项目(41272281)。

摘　　要：为研究在黏土砂层交替分布地基条件下间隔分布的黏土层在固结过程中的相互影响,提出一种新的固结计算模型,并通过数值变换法给出模型中各土层超孔压的半解析解。对理论解答分别进行理论验证、数值验证的基础上,分析部分参数对黏土层固结的影响。研究表明,在确定黏土层中不排水面位置的前提下,提出的理论计算方法可以有效计算多级加载工况中两相邻不排水面之间的土层超孔压;这种地基条件下,考虑黏土层在固结过程中的相互影响对保证计算结果的准确性有重要意义;黏土层固结性状对砂层厚度、砂层渗透系数的敏感性相同;大部分堆载预压工程按一维固结理论进行计算时得到的结果误差偏大。研究结果可为以整体分析的方式研究黏土砂层交替分布地基的固结性状提供参考。In order to study the mutual influence of the spaced clay layers in the consolidation process under the condition of alternately distributed clay-sand soils, a new consolidation calculation model was established, and the semi-analytical solution of excess pore pressure of each layer in the model were given using the numerical transformation method. Based on the theoretical verification and numerical verification of the theoretical formula, the influence of some parameters on the consolidation of the clay was analyzed. The results showed that the proposed theoretical method could effectively calculate the excess pore pressure of the soils between two adjacent undrained surfaces under the condition of multi-stage loading after the position of the undrained surface in the clay determined;considering the mutual influence of the clay layers in the consolidation process was of great significance to ensure the accuracy of the calculation results in soils with alternating clay-sand layers;the consolidation properties of the clay layer had the same sensitivity to the thickness and the permeability coefficient of the sand layer;most of the preloading projects had large errors when calculated according to the one-dimensional consolidation theory. The research results could provide a reference for studying the consolidation behaviors of alternately distributed clay-sand soils by means of overall analysis.

关 键 词：黏土砂层交替分布地基 超静孔压 半解析解 多级加载 附加应力分布 

分 类 号：TU447[建筑科学—岩土工程]