摘要
广东牛田洋快速道路基范围多滩涂,土壤天然含水率高达139.42%,承载力极低,没有持力层,施工机械无法进入场地。为了改善路基土的力学性质,减少对周围环境的影响,采用了就地固化技术对滩涂土进行处理。为了进一步反映土壤固化后的性质变化,分别就路基土固化后的含水率、强度以及承载力展开研究,并对固化路基的极限承载力进行预测。结果表明:采用的5%水泥+2%粉煤灰的固化剂配比足够满足工程需求,且可以通过规范法或拟合方程校核固化地基的承载力。论证了就地固化技术在滩涂地区的适用性。
The roadbed of Niutianyang Expressway in Guangdong Province is covered by multiple beaches,and the natural moisture content of the soil is as high as 139.42%,with extremely low bearing capacity.Construction machinery cannot enter the site because there is no load layer.In order to improve the mechanical properties of subgrade soil and reduce the impact on the surrounding environment,in-situ solidification technology was used to treat the tidal flat soil.In order to further reflect the change of soil properties after solidification,the water content,strength and bearing capacity of subgrade soil after solidification were studied,respectively.And the ultimate bearing capacity of solidified subgrade was predicted.The results show that the curing agent ratio of 5%cement and 2%fly ash is enough to meet the engineering needs,and the bearing capacity of the solidified foundation can be checked by standard method or fitting equation.The applicability of in-situ solidification technology in tidal flat area is demonstrated.
作者
沈政
陈龙
陈永辉
曾昭宇
刘斌
SHEN Zheng;CHEN Long;CHEN Yong-hui;ZENG Zhao-yu;LIU Bin(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098,China;Guangdong Transportation Planning and Design Institute, Guangzhou 510507, China;Shenzhen Municipal Engineering Corporation, Shenzhen 518000, China)
出处
《科学技术与工程》
北大核心
2021年第16期6815-6822,共8页
Science Technology and Engineering
基金
国家自然科学基金青年科学基金(51708175)
中央高校业务费项目(B210202032)
土木工程学科新教师研究方向培育项目。
关键词
滩涂
就地固化
含水率试验
静力触探试验
静载荷试验
极限承载力
intertidal zone
in-situ solidification
moisture test
static cone penetration test
static load test
ultimate bearing capacity
