大面积荷载下一维分层固结计算方法及应用

One-Dimensional Consolidation Calculation and Application of the Layered Soil Under Large-Scale Loads

单层土的一维固结问题的研究已经取得了较大的进展,形成了经典的太沙基一维固结理论,但是实际工程土层是多层的,其固结性质与单层土情况存在着一些不同。从超孔隙水压力消散基本方程出发,考虑了单面排水和双面排水两种情况,可以推导出分层土的一维固结计算公式,同时以具体工况为背景,结合MATLAB软件对公式加以运用验证,总结了分层土单面排水和双面排水条件下的一维固结规律,规律表明:计算公式结果与实际情况较为吻合,因此推导的公式可以为实际土体的设计施工监测提供一种参考;边界排水条件的差异对于土体的固结速率和程度有较大的影响。

Great progress in the study of the one-dimensional consolidation problem about the single-layered soil is already made and results in the classical Terzaghi one-dimensional consolidation theory. However,in practical engineering, the soil is not sin- gle-layered but often multiple-layered. The consolidation properties of the multi-layered soil are somewhat different from the single-layered soil. Upon the basis of the basic equation of the excess pore pressure dissipation, the one-dimensional consolida- tion calculation formulae of the layered soil can be derived, with both the one-side drainage and the two--side drainage taken in- to account. Then, with some real projects as examples, the formulae are applied and tested with help of the MATLAB software, with the one-dimensional consolidation laws of the multi-layered soil under the conditions of the one-side drainage and two-side drainage summarized. The results of our research show that the results derived from the formulae are found to be in good agree- ment with the actual situations. Therefore,the formulae deduced in this paper may serve as a useful reference for the design, construction and monitoring of the soil body. The differences in the drainage conditions have great influence on the consolidation rate and degree.