摘要
为研究考虑边界排水的时效特性、变荷载、非达西渗流以及土体非线性特性的饱和软土固结问题,通过引入连续排水边界,建立考虑指数渗流和土体非线性的固结方程。利用有限差分法得到变荷载及瞬时荷载下基于连续排水边界考虑指数渗流的软土一维非线性固结解答,通过渗流形式退化和边界退化的方法,将所得解答与达西渗流下的解答及传统排水边界下的解答对比验证了该文差分法解答的可靠性。基于所得解答,详细分析了界面参数、指数渗流及土体非线性等因素对固结特性的影响。结果表明:界面参数取值越大则边界排水能力越大,边界排水性能较差时提高界面参数取值能有效提高边界排水能力;边界排水性能主要影响土体固结前期,而指数渗流主要影响固结后期;实际工程中如果关注固结的整个过程,则需要考虑边界排水性能的影响,但如果只关注固结后期的沉降值,则可忽略边界排水性能的影响。
In order to study the consolidation of saturated soft soil considering the time-dependent characteristics of boundary drainage,variable loading,non-Darcian flow and nonlinear characteristics of soil,the one-dimensional consolidation equation considering exponential flow and nonlinear characteristics of soil is established by introducing the continuous drainage boundary.The solution of one-dimensional nonlinear consolidation problem of soft soil considering exponential flow based on continuous drainage boundary under variable loading and instantaneous loading is obtained using finite difference method.By means of flow degradation and boundary degradation,the proposed solution is compared with the solution under Darcian flow and the solution under traditional drainage boundary to verify the reliability of the finite difference method in this paper.Based on the proposed solution,the influences of interface parameter,exponential flow and soil nonlinearity on consolidation characteristics are analyzed in detail.The results show that the boundary drainage capacity increases with the increase of the interface parameter,and increasing the interface parameter can effectively improve the boundary drainage capacity when the boundary drainage performance is weak.Boundary drainage performance mainly affects the early stage of soil consolidation,while exponential flow mainly affects the later stage of consolidation.In practical engineering,if the whole consolidation process is concerned,the influence of boundary drainage performance should be considered.However,if only the settlement value at the later stage of consolidation is concerned,the influence of boundary drainage performance can be ignored.
作者
宗梦繁
吴文兵
梅国雄
张驿
梁荣柱
ZONG Meng-fan;WU Wen-bing;MEI Guo-xiong;ZHANG Yi;LIANG Rong-zhu(School of Civil and Ocean Engineering,Jiangsu Ocean University,Lianyungang,Jiangsu 222005,China;Faculty of Engineering,China University of Geosciences,Wuhan,Hubei 430074,China;Key Laboratory of Disaster Prevention and Structural Safety,Ministry of Education,Guangxi University,Nanning,Guangxi 530004,China)
出处
《工程力学》
EI
CSCD
北大核心
2024年第7期60-67,共8页
Engineering Mechanics
基金
国家自然科学基金项目(52178371,51878634,52178321,52108322)。
关键词
一维固结
连续排水边界
非线性
指数渗流
界面参数
one-dimensional consolidation
continuous drainage boundary
nonlinear
exponential flow
interface parameter
