海陆交互沉积土次固结试验与蠕变方程研究  

Study on the secondary consolidation test and creep equation of marine-terrestrial interactive deposits

作　　者：李刚[1,2] 张金利[2] 杨庆[2] 蒋明镜[3] LI Gang1,2, ZHANG Jinli2, YANG Qing2, JIANG Mingjing3(1. Shaanxi Key Laboratory of Safety and Durability of Concrete Structures, Xijing University, Xi＇an 710123, China; 2. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China; 3. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, Chin)

机构地区：[1]西京学院陕西省混凝土结构安全与耐久性重点实验室,陕西西安710123 [2]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [3]同济大学地下建筑与工程系,上海200092

出　　处：《水资源与水工程学报》2017年第6期194-199,共6页Journal of Water Resources and Water Engineering

基　　金：国家自然科学基金项目(41572252)

摘　　要：海陆交互沉积土广泛分布于沿海地区,其力学性质较其他沉积土有所不同。针对大连海陆交互沉积土原状样,采用一维蠕变试验对黏性土的蠕变特性进行了研究。基于蠕变试验结果,建立了可以考虑沉积土主、次固结效应的蠕变方程。研究结果表明:该地区沉积土具有典型的非线性蠕变特性。随固结压力的增加,土体应变随之增大,稳定时间越长,主次固结分界点也愈加明显。沉积土属中等至高次压缩性土,次固结系数随固结时间的增加而减小,随固结压力的增加而增大。不同深度黏性土次固结系数与压缩指数的比值介于0.033~0.058之间,与Mesri结论相符。模型计算结果与试验结果吻合较好,表明蠕变方程适用于描述大连海陆交互沉积土的蠕变特性。Marine-terrestrial interactive deposits are widely distributed in the coastal cities,and the mechanical properties are different from the other deposits. Considering the undistributed samples of marineterrestrial interactive deposit in Dalian,the creep behaviors of Dalian marine-terrestrial deposits were studied according to one dimensional creep tests. Based on the test results,the creep equation was established which considered the primary consolidation and secondary consolidation in the meantime. The results showed that,Dalian deposits have typical nonlinear creep behavior. With the increasing of consolidation pressure,the strain is increased. The longer the stability time is,the more obvious demarcation point between primary and secondary consolidation is. The deposits belong to medium to high secondary compressibility soil,and the secondary consolidation coefficient is decreasing with the increasing of consolidation time,and increasing as the consolidation pressure increases. The ratio of secondary consolidation coefficient to compression index in different depth ranges from 0. 033 to 0. 058,which conforms to Mesri conclusion. The tests results agree well with the calculation results,which showed that the creep equation is suitable for describing the creep behaviors of Dalian marine-terrestrial interactive deposits.

关 键 词：海陆交互沉积 黏性土 主固结 次固结 蠕变方程 

分 类 号：TU411.5[建筑科学—岩土工程]