连续排水边界条件下线性加载地基一维固结解析解  

ANALYTICAL SOLUTION FOR ONE-DIMENSIONAL CONSOLIDATION OF SOFT CLAYEY SOIL WITH A CONTINUOUS DRAINAGE BOUNDARY UNDER LINEAR LOADING

作　　者：冯健雪 陈征 李勇义 梅国雄 FENG Jian-xue;CHEN Zheng;LI Yong-yi;MEI Guo-xiong(Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Nanning 530004,China;Guangxi Key Laboratory of Disaster Prevention and Structural Safety,Nanning 530004,China;College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering (Wuhan University),Ministry of Education,Wuhan 430072,China;CCCC Second Highway Consultants Co. Ltd.,Wuhan 430056,China)

机构地区：[1]工程防灾与结构安全教育部重点实验室,南宁530004 [2]广西防灾减灾与工程安全重点实验室,南宁530004 [3]广西大学土木工程学院,南宁530004 [4]武汉大学水工岩石力学教育部重点实验室,武汉430072 [5]中交第二公路勘察设计研究院有限公司,武汉430056

出　　处：《工程力学》2019年第6期219-226,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(51578164,41672296);广西自然科学基金创新研究团队项目(2016GXNSFGA380008)

摘　　要：基于瞬时加载下的连续排水边界条件,推导出任意荷载连续排水边界条件,建立了任意荷载连续排水边界条件下线性加载一维固结方程。利用有限正弦傅里叶变换,求解出其解析解,通过公式退化和有限元成果对比分析,对该文解答的正确性进行了验证。在不同加载速率和界面参数的条件下,分析了加载速率和界面排水参数对孔压和平均固结度的影响。结果表明:加载速率对固结影响较为显著,加载速率越大,孔压消散越为迅速;当加载速率趋于无穷大时,线性加载退化为瞬时加载;随着界面参数的增大,孔压消散明显,地基固结增快;当界面参数趋于无穷大时,排水边界退化为完全排水边界。工程中,在界面参数或堆载时间确定时,对选择合适的堆载时间或界面参数保证地基稳定性和提高工程效益具有一定参考意义。Based on the instantaneous loading with continuous drainage boundary conditions, a continuous drainage boundary condition under arbitrary loading is derived. The one-dimensional consolidation equation of linear loading is established under the continuous drainage boundary conditions under arbitrary loading. Using the finite Fourier sine transformation method, the analytical solution is presented. The effectiveness of the solution is demonstrated by formula degradation and a comparison with finite element analysis results. The influence of the loading rate and interface parameters on the excess pore-water pressure and consolidation degree is discussed. The results show that the loading rate has a significant effect on consolidation, and that the greater is the loading rate,the faster the excess pore-water pressure dissipates. When the loading rate approaches to infinity, linear loading degradation is instantaneous loading. With the increase of the interface parameters, the excess pore-water pressure dissipates and the consolidation increases rapidly. When the interface parameter approaches to infinity, the drainage boundary degenerates into a complete permeable boundary. In engineering practice, when the interface parameters(or surcharge time) are determined, it is of certain significance to select suitable loading time(or interface parameters) to ensure the stability of foundation and to increase engineering benefits.

关 键 词：连续排水边界 线性加载 解析解 加载速率 界面参数 平均固结度 

分 类 号：TU43[建筑科学—岩土工程]