上海冲填土自重固结沉降离心模型试验  

Consolidation settlement of Shanghai dredger fill under self-weight using centrifuge modeling test

作　　者：杨坪[1] 唐益群[1] 周念清[1] 王建秀[1] 

机构地区：[1]同济大学岩土及地下工程教育部重点实验室

出　　处：《中南大学学报（自然科学版）》2008年第4期862-867,共6页Journal of Central South University:Science and Technology

基　　金：国土资源部、上海市人民政府联合资助项目(基[2004]011-02);上海市博士后科研基金资助项目(05R214145)

摘　　要：为了了解冲填土在自重作用下的变形规律,以上海临港新城地区冲填土为材料,采用离心模型试验,模拟冲填土10a的自重固结沉降过程,用Orgin软件对试验数据进行回归分析。冲填土的自重固结沉降与时间的关系符合Hill模型,利用Hill模型可对冲填土地区沉降变形进行预测。试验结果表明:冲填土的自重固结过程包括快速固结和缓慢固结2个阶段,快速固结阶段所需时间大约1a,缓慢固结阶段时间较长;在快速固结开始阶段,沉降很快,固结时间为0.5a的固结度可达50%,快速固结阶段的沉降量占最终沉降量的80%,而缓慢固结阶段的沉降量只占最终沉降量的20%。In order to understand the reform law of the dredger fill under self-weight, a centrifuge model test was used to study the consolidation settlement of the dredger fill in Lingangxincheng area of Shanghai under its self-weight for 10 a. The relationship between settlement and time was fitted by Orgin. An empirical formulation, Hilllnodel, was determined. The results show that the Hill model can be used to predict the consolidation settlement of dredger ill）. The consolidation settlement under its self-weight includes two stages： quick consolidation and slow consolidatio＊n. The quick consolidation takes about 1 a while the slow consolidation requires even longer time. At the initial stage of the quick consolidation, soil settles fastly. 50% of the settlement is completed after half a year. 80% of the total settlement takes place during the quick consolidation. The remaining 20% of the settlement occurs during the slow settlement.

关 键 词：冲填土 自重固结 沉降 离心试验 

分 类 号：TU411.93[建筑科学—岩土工程]