吹填土砂井地基离心模型试验研究  

Experimental study on centrifugal model test of sand well foundation filled with dredger fill

作　　者：陈科平[1] 任新开 贺勇[1] 吴丹伟 CHEN Keping;REN Xinkai;HE Yong;WU Danwei(Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University),Ministry of Education,Changsha 410083,China;Guangxi Liuzhou Iron and Steel Group Co.Ltd.,Liuzhou 545002,China)

机构地区：[1]中南大学有色金属成矿预测与地质环境监测教育部重点实验室,湖南长沙410083 [2]广西柳州钢铁集团有限公司,广西柳州545002

出　　处：《中南大学学报（自然科学版）》2021年第4期1222-1231,共10页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(41807253,42072318);湖南省高新技术产业科技创新引领计划项目(2020GK2067)。

摘　　要：采用土工离心试验方法,结合现场测试,研究吹填陆域真空预压后的固结沉降特性。研究研究表明:离心试验中相邻砂井连线中心沉降为对角砂井连线中心沉降的87%,地表最终沉降和现场监测结果基本一致,两者沉降稳定在300 mm左右;现场真空预压前期地表沉降速率比模型试验地表沉降速率快,中期沉降速率相近,后期沉降均稳定;离心试验中孔隙水压力缓慢下降,而现场孔隙水压力为先下降后上升再缓慢下降,由于排水方式不同,离心试验孔隙水压力和现场孔隙水压力表现规律不同;所得出的沉降规律可为吹填陆域后续施工提供参考。The characteristics of consolidation settlement after vacuum preloading in land fill was studied by geotechnical centrifugal test and field test.The results show that the center settlement of one-dimensional foundation is 87%of that of the center settlement of two-dimensional foundation in the centrifugal test.The final surface settlement is basically consistent with the field monitoring results,and the settlement of both is stable at about 300 mm.In the early stage of field vacuum preloading,the surface settlement rate is faster than that of the model test,the intermediate settlement rate is similar,and the later settlement rate is stable.In the centrifugal test,the pore water pressure dectrases slowly,while in the field,the pore water pressure first decreases,then increases and then slowly decreases.Due to the different drainage methods,the performance of the two kinds of pressure is different.The settlement law proposed by the study can provide some reference for the subsequent construction of the land filling area.

关 键 词：吹填土 真空预压 等效替代 土工离心 

分 类 号：TU447[建筑科学—岩土工程]