岩土工程学报2024，Vol.46Issue(z2)：210-215,6.DOI:10.11779/CJGE2024S20046
柱状和格栅状搅拌桩联合加固河堤变形特征离心模型试验研究
Centrifugal model tests on deformation characteristics of river embankment improved by combined columnar and grid-form columns
摘要
Abstract
The centrifugal model tests are conducted to investigate the deformation characteristics of the river embankment on soft ground improved by the combined columnar and grid-form columns.The results indicate that reinforcing a river embankment on soft soil foundations with columnar and grid-form deep mixing columns can effectively control foundation settlement and reduce horizontal displacement,resulting in stability of high slopes.The maximum settlement occurs at the top of the river embankment,and although the settlement is not fully stabilized one year after construction,the settlement rate slows down.The significant stress concentration effects of the mixing columns accelerate the consolidation rate of the foundation.Based on measured settlement and excess pore water pressure,the degree of consolidation of the column-reinforced foundation one year after construction reaches over 80%and 75%,respectively.Due to the stiffness difference between the columns and the surrounding soil,the stress distribution exhibits stress concentration effects in the model.The measured column-soil stress ratio ranges between 2～3.关键词
软土地基/柱状搅拌桩/格栅搅拌桩/河堤/离心模型试验Key words
soft ground/columnar deep mixed column/grid-form deep mixed column/river embankment/centrifuge model test分类
土木建筑引用本文复制引用
沈晨,章定文,宋涛,张国龙..柱状和格栅状搅拌桩联合加固河堤变形特征离心模型试验研究[J].岩土工程学报,2024,46(z2):210-215,6.基金项目
国家自然科学基金面上项目(52078129) （52078129）
综合交通运输理论交通运输行业重点实验室(南京现代综合交通实验室)开放课题(MTF2023009) （南京现代综合交通实验室）
江苏省研究生科研与实践创新计划项目(SJCX21_0031) （SJCX21_0031）
