上海交通大学学报 ›› 2022, Vol. 56 ›› Issue (5): 675-683.doi: 10.16183/j.cnki.jsjtu.2021.057
收稿日期:
2021-02-11
出版日期:
2022-05-28
发布日期:
2022-06-07
作者简介:
周洁(1986-),女,上海市人,副教授,从事人工地层冻结法研究;E-mail: 基金资助:
Received:
2021-02-11
Online:
2022-05-28
Published:
2022-06-07
摘要:
在沿海上软黏下粉砂组合地层中进行人工地层冻结法施工时,粉砂土和软黏土在冻结过程中表现出的水分迁移和变形特性上的差异性不可忽略,是目前较多冻结法工程事故的根源.为了探明两者之间的差异性,通过自制单向冻结仪对原状上海第②3层灰色粉砂土及重塑上海第④层淤泥质软黏土分别进行冷端温度为 -20、-15、-10 ℃的冻结试验,分析两种土在冻结过程中水分迁移及变形特征的差异.结果表明,粉砂土及软黏土的总变形曲线和分层变形曲线可按土性分为 I 类陡变型曲线(粉砂土)和 II 类缓变型曲线(软黏土),软黏土分层变形曲线在某些分层中还表现出较大的波动性.表明冻结过程中, 软黏土内部水分迁移充分发展,而粉砂土内部大部分水分迅速冻结,迁移不显著.两种土性表现出的变形曲线的差异性和冻结前后的水分分布曲线存在一致对应性.该研究成果可为沿海上软黏下粉砂组合地层冻结法实践中应对冻胀等工程问题的相关措施提出针对性建议.
中图分类号:
周洁, 任君杰. 沿海组合地层人工冻结过程中的水分迁移及变形特性[J]. 上海交通大学学报, 2022, 56(5): 675-683.
ZHOU Jie, REN Junjie. Water Migration and Deformation Characteristics of Coastal Complex Strata in Artificial Freezing Process[J]. Journal of Shanghai Jiao Tong University, 2022, 56(5): 675-683.
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