偏压固结软黏土循环特性试验研究  

Experimental study on cyclic character of soft clay under anisotropic consolidation

作　　者：王元战[1] 薛寒[1] 胡珅榕 吴林键[1] WANG Yuan-zhan XUE Han HU Shen-rong WU Lin-jian(State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China CCCC First Harbor Consultants Co.,Ltd., Tianjin 300222, China)

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072 [2]中交第一航务工程勘察设计院有限公司,天津300222

出　　处：《水道港口》2017年第2期162-167,共6页Journal of Waterway and Harbor

基　　金：国家自然科学基金(51279128);国家自然科学基金创新研究群体科学基金(51321065);交通运输部交通建设科技项(2014328224040)

摘　　要：关于软黏土循环强度弱化的研究已经有了很多成果。然而在工程上为了削弱循环荷载对土体的影响,一般会采取打塑料排水板、堆载预压等软基处理手段来提高土体强度,从而减弱循环荷载对土体的弱化作用。以烟台港原状淤泥质粉质黏土为研究对象,通过室内动三轴试验,探究土体在静偏应力固结后累积孔压的发展规律和循环强度的弱化规律。根据孔压数据拟合出软黏土的孔压模型,再利用等效超固结比理论将孔压模型与强度弱化规律相结合,得到了适用于偏压固结之后整个动态循环过程的强度变化公式。The researches on cyclic strength weakening of soft clay have achieved a lot. However, in order to weaken the effect of cyclic loading on the soil, in engineering it usually takes plastic drainage plate and preloading as soft foundation treatment methods to improve the soil strength, and then to weaken the effect of cyclic loading on the soil. By means of performing the cyclic triaxial test on the muddy clay taken from Yantai littoral zone, pore water pressure variation and cyclic strength weakening of clay have been studied. According to the laws of the development of pore pressure, a calculation model for pore pressure was proposed. In addition, by using the theory of quasioverconsolidation and combining the pore pressure model and the laws of strength, a formula of strength changing which is dynamic in the process was put forward.

关 键 词：偏压固结 循环荷载 孔压模型 强度特性 

分 类 号：TU43[建筑科学—岩土工程]