Centrifuge modeling of a large-scale surcharge on adjacent foundation  

作　　者：Jinzhang Zhang Zhenwei Ye Dongming Zhang Hongwei Huang Shijie Han Tong Zou Le Zhang 

机构地区：[1]Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education and Department of Geotechnical Engineering,Tongji University,Shanghai,200092,China [2]CCCC Third Harbor Consultants Co,Ltd,Shanghai,200032,China [3]Qingdao Conson Jiaozhou Bay Second Subsea Tunnel Co.,Ltd,Qingdao,266000,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2024年第8期3181-3191,共11页岩石力学与岩土工程学报（英文版）

基　　金：funding support from National Key Research and Development Program of China(Grant No.2021YFF0502200);National Natural Science Foundation of China(Grant Nos.52022070 and 51978516).

摘　　要：This study investigates the ground and structural response of adjacent raft foundations induced by largescale surcharge by ore in soft soil areas through a 130g centrifuge modeling test with an innovative layered loading device.The prototype of the test is a coastal iron ore yard with a natural foundation of deep soft soil.Therefore,it is necessary to adopt some measures to reduce the influence of the large-scale surcharge on the adjacent raft foundation,such as installing stone columns for foundation treatment.Under an acceleration of 130 g,the model conducts similar simulations of iron ore,stone columns,and raft foundation structures.The tested soil mass has dimensions of 900 mm×700 mm×300 mm(lengthwidthdepth),which is remodeled from the soil extracted from the drilling holes.The test conditions are consistent with the actual engineering conditions and the effects of four-level loading conditions on the composite foundation of stone columns,unreinforced zone,and raft foundations are studied.An automatic layer-by-layer loading device was innovatively developed to simulate the loading process of actual engineering more realistically.The composite foundation of stone columns had a large settlement after the loading,forming an obvious settlement trough and causing the surface of the unreinforced zone to rise.The 12 m surcharge loading causes a horizontal displacement of 13.19 cm and a vertical settlement of 1.37 m in the raft foundation.The stone columns located on both sides of the unreinforced zone suffered significant shear damage at the sand-mud interface.Due to the reinforcement effect of stone columns,the sand layer below the top of the stone columns moves less.Meanwhile,the horizontal earth pressure in the raft foundation zone increases slowly.The stone columns will form new drainage channels and accelerate the dissipation of excess pore pressure.

关 键 词：Centrifuge modeling Stone column Composite foundation Ground movement Raft foundation 

分 类 号：TV223[水利工程—水工结构工程]