深厚粉砂层三轴搅拌桩不返浆问题分析及处理
|
摘要
通过现场补充勘察及室内试验对比,对苏州某基坑围护三轴搅拌桩施工过程中出现的不返浆问题进行了分析,并对后续的施工方案进行了优化调整。试验表明,深基坑降水和施工扰动易引起周边砂土的地下水环境变化,深厚粉砂层性质发生相应变化,进而引起不返浆问题,外加剂膨润土对砂土中的返浆作用很明显,能有效提高返浆性能。
This paper presents a case history of the mitigation of no return slurry incident in the three-axis soil mixing for a deep excavation support project in Suzhou.Throughout the exploratory soil borings and laboratory testing,it is suggested that the groundwater conditions changed during the dewatering and piling operations in the silty and sandy soils.The disturbed silty and sand soils are the main cause that resulting the no slurry returning.Adding the bentonite into the soil strata would significantly improve the returning of the slurry in the soil mixing.
This paper presents a case history of the mitigation of no return slurry incident in the three-axis soil mixing for a deep excavation support project in Suzhou.Throughout the exploratory soil borings and laboratory testing,it is suggested that the groundwater conditions changed during the dewatering and piling operations in the silty and sandy soils.The disturbed silty and sand soils are the main cause that resulting the no slurry returning.Adding the bentonite into the soil strata would significantly improve the returning of the slurry in the soil mixing.
引文
[1]曹琼英.苏州浅层第四系与工程地质条件研究[M].南京大学出版社,1994.
[2]姜洪涛,施斌.苏州城区浅地层的工程地质性质研究[J].水文地质工程地质,1995(3):35-37.
[3]张邦柱,沈自励.浅谈苏州地区地质构造与历史地震[J].铁道师院学报(自然科学版),1989(1):23-26.
[2]姜洪涛,施斌.苏州城区浅地层的工程地质性质研究[J].水文地质工程地质,1995(3):35-37.
[3]张邦柱,沈自励.浅谈苏州地区地质构造与历史地震[J].铁道师院学报(自然科学版),1989(1):23-26.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心