A novel semi-analytical method for evaluating average consolidation degree of a two-soil-layer deposit
A novel semi-analytical method for evaluating average consolidation degree of a two-soil-layer deposit
复制标题
评价两层土平均固结度的半解析新方法
DOI：
10.1007/s10064-021-02506-w
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发表时间：
2021
影响因子：
4.2
通讯作者：
F. Xu
中科院分区：
文献类型：
--
作者：
Y. Zhou;F. Xu
在工程实践中，有时会遇到两层土层。为了准确地评估两土层存款的固结条件，有必要公平地估计沉降和超孔隙水压力定义的系统的平均固结度。本文首先对两土层存款的固结特性进行了试验研究和数值模拟，结果表明，超孔隙水压力（ADCu）定义的平均固结度一般小于沉降（ADCs）定义的平均固结度，且当排水边界附近存在较软且透水性较差的土层时，两者的差异更为明显。引入了一个新的指标（β），表示排水边界附近土层的渗透性降低，以间接量化ADCu和ADC之间的差异。将β值与两土层存款的渗透性、压缩性、土层厚度和荷载条件定量关联，并通过对两土层存款ADCs预测理论的修正，提出了一种具有通用应用程序的两土层ADCu估算方法。通过对两个双层地基固结试验的应用表明，该方法具有较好的有效性。
Two-soil-layer deposits are sometimes encountered in engineering practice. To accurately assess the consolidation condition of a two-soil-layer deposit, it is necessary to fairly estimate both the settlement- and excess pore water pressure-defined average degrees of consolidation of the system. In this study, the consolidation behavior of a two-soil-layer deposit is first experimentally and numerically investigated, and the results show that the average degree of consolidation defined by the excess pore water pressure (ADCu) is generally less than that defined by the settlement (ADCs), and the difference can be distinct when a softer and less permeable layer is located adjacent to the drainage boundary. A new index (β) denoting the permeability reduction in the soil layer adjacent to the drainage boundary is introduced to indirectly quantify the difference between the ADCu and ADCs. Theβvalue is quantitatively correlated to the permeability, compressibility, soil layer thickness, and loading condition of a two-soil-layer deposit, and a simple method with general application procedures is finally proposed to evaluate the ADCu of a two-soil-layer deposit by modifying a theory that was originally developed to predict the ADCs. Application of the proposed method to another two consolidation tests of two-soil-layer deposits demonstrates that the method has satisfactory validity.