土木与环境工程学报（中英文）2024，Vol.46Issue(5)：81-90,10.DOI:10.11835/j.issn.2096-6717.2023.138
不同含水状态下微生物珊瑚砂桩单桩复合地基模型试验研究
Experimental study on single pile composite foundation model of biocemented coral sand pile under different water content states
摘要
Abstract
The microbial coral sand pile composite foundation is composed of coral sand and coral sand piles solidified using MICP,which has the advantages of the ability to obtain local materials,less disturbance to the ground and marginal effects to the ecological environment of islands and reefs,and has good application prospects for construction of islands and reefs.Through the model test of single pile composite foundation of biocemented coral sand pile under different working conditions,the influence of relative density(50%,65%,72%),area replacement rate(8%,14%,20%),water content(dry and saturated)and water level fluctuation on the bearing characteristics was revealed.The test shows that in the dry state,with increase of the relative density and the area replacement rate,the bearing capacity and the pile side friction of the single pile composite foundation of biocemented coral sand pile increase.The axial force of the microbial coral sand pile and the stress ratio of pile and soil decrease with increase of the relative density,and increase with the area replacement rate.The bearing capacity of composite foundation can be effectively improved by increasing the relative density and area replacement rate.The ultimate bearing capacity of the single pile composite foundation of biocemented coral sand pile in the saturated state is 49%-66%of the bearing capacity in the dry state.Under the same upper load and area replacement rate,compared with the dry state,the pile side friction resistance and the maximum pile axial force of the composite foundation in the saturated state decrease,the stress ratio of pile and soil increases.The twice water level rises and falls have marginal effect on the bearing characteristics of single pile composite foundation.关键词
微生物珊瑚砂桩/复合地基/模型试验/承载力Key words
biocemented coral sand pile/composite foundation/model tests/bearing capacity分类
建筑与水利引用本文复制引用
申春妮,章懿涛,方祥位,张伟,胡丰慧..不同含水状态下微生物珊瑚砂桩单桩复合地基模型试验研究[J].土木与环境工程学报（中英文）,2024,46(5):81-90,10.基金项目
国家自然科学基金(51978103) （51978103）
重庆英才创新创业示范团队项目(cstc2024cjh-bgzxm0012) （cstc2024cjh-bgzxm0012）
重庆市技术创新与应用发展专项重点项目(JG2021072) National Natural Science Foundation of China(No.51978103) （JG2021072）
Chongqing Talent Innovation and Entrepreneurship Demonstration Team Project Foundation(No.cstc2024cjh-bgzxm0012) （No.cstc2024cjh-bgzxm0012）
Special Key Project of Technological Innovation and Application Development of Chongqing(No.JG2021072) （No.JG2021072）
