基于平板载荷试验对黏性渗流固结理论的分析  

Analysis of Viscous Seepage Consolidation Theory Based on Plate Loading Test

作　　者：周冕 齐龙 李安帮 王述红[2] 李志华 ZHOU Mian;QI Long;LI Anbang;WANG Shuhong;LI Zhihua(CCFEB Civil Engineering Co., Ltd., Yiyang 413000, Hunan, China;School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China)

机构地区：[1]中建五局土木工程有限公司,湖南益阳413000 [2]东北大学资源与土木工程学院,沈阳110819

出　　处：《路基工程》2019年第3期1-5,共5页Subgrade Engineering

基　　金：国家自然科学基金资助项目(51474050,U1602232);中央高校基本科研业务专项资金资助(N17010829);辽宁省自然科学基金项目(20170540304,20170520341)

摘　　要：针对经典的太沙基一维固结理论所采用的弹簧-水-活塞板模型中的不足,结合益阳地区土的特性,提出了修正后的弹簧-黏滞壶-水-活塞板模型。该模型利用土体单元在单位时间内的压缩量与土中孔隙体积的变化量相等的等量关系,推导出新的渗流固结方程。结合边界条件,利用修正后的渗流固结方程,求得计算土层内任一点的超孔隙水压力,从而进一步求得该点的沉降量。为了验证该方程的合理性,现场实施了保真度较高,对土体扰动较小的原位平板载荷试验,通过试验结果得到的p-s曲线计算沉降,并与修正后的渗流固结理论得到的沉降量进行对比。Considering the shortages of spring-water-piston plate model used by Terzaghi^ one-dimensional consolidation theory, the corrected spring-dashpot-water-piston plate model was proposed with the character of soil in Yiyang region involved. In virtue of the relationship that the compression of soil element in unit time equal to the variation of pore volume in soil in this corrected model, a new seepage consolidation equation was derived, by which given the boundary conditions the excess pore water pressure at any point in the soil layer to be calculated may be solved, and the settlement at this point further obtained. To verify the reasonability of this new equation, in-situ plate loading test of high fidelity and small soil disturbance was conducted to get a p-s curve for settlement calculation, and it was compared with the settlement from the corrected seepage consolidation equation.

关 键 词：渗流固结 沉降 载荷试验 路基 黏土 

分 类 号：TU45[建筑科学—岩土工程]