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考虑非达西渗流的结构性软土非线性固结分析 预览

Analysis on nonlinear consolidation of structural soft soil by considering non-Darcian flow
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摘要 在传统太沙基一维固结理论基础上,引入经典的Hansbo非达西渗流模型,考虑天然土体结构性对固结的影响,建立实际变荷载作用下土体的非线性固结模型,并利用有限差分法求取模型的数值解.在保证数值解可靠性的基础上,分析非达西渗流对结构性软土固结性状的影响及非达西渗流下土体结构性对固结性状的影响.结果表明:非达西渗流下结构性软土的固结速率要比达西定律下慢,且随非达西渗流模型参数m和i1的增大,固结速率的减小愈加明显;对考虑非达西渗流的结构性软土而言,结构屈服应力越大,结构屈服应力前土的压缩指数越小,则结构性软土的固结速率越大,地基土的最终沉降值越小. Based on Terzaghi's theory of consolidation and classical Hansbo's non-Darcian flow model, a nonlinear consolidation model was developed with consideration of natural soil structure and time- dependent load in practical engineering, and the finite difference method was adopted to obtain numerical solutions of the model. Based on the reliability of numerical solutions, the effects of non-Darcian flow and soil structure on the consolidation behavior of structural soft soil with non-Darcian flow were analyzed. The results show that the consolidation rate of structural soft soil with non-Darcian flow is slower than that with Darcy's flow. The consolidation rate is decreased with the increasing of m or i~ value. When the non-Darcian flow in structural soft soil layer is considered, the consolidation rate is increased with the increasing of' structural yield stress and decreasing of compression-index below structural yield stress. The final settlement is decreased with the increasing of structural yield stress and decreasing of compression- index below structural yield stress.
作者 李传勋 王昌建 王素 董兴泉 LI Chuanxun, WANG Changjian, WANG Su, DONG Xingquan (Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, Jiangsu 212013, China)
出处 《江苏大学学报:自然科学版》 CSCD 北大核心 2017年第4期472-478,共7页 Journal of Jiangsu University:Natural Science Edition
基金 国家自然科学基金资助项目(51109092) 中国博士后基金第七批特别资助项目(2014T70479) 江苏大学高级人才启动基金资助项目(12JDG098) 江苏省普通高校研究生科研创新计划项目(SJLX15-0498)
关键词 结构性软土 非达西渗流 非线性固结 结构屈服应力 渗透系数 structural soft soil non-Darcian flow nonlinear consolidation structural yield stress coefficient of permeability
作者简介 李传勋(1978-),男,吉林榆树人,副教授(lichuanxun@yeahnet),主要从事岩土工程的研究. 王昌建(1990-),男,江苏泰州人.硕士研究生(wangchangjan90815@yeah.net),主要从事岩土工程的研究.
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