土工基础

土工基础 ›› 2022, Vol. 36 ›› Issue (3): 406-409.

• 专题论述 • 上一篇    下一篇

含水率对砾砂二元结构地基潜蚀破坏的影响——以桂林市漓江一级阶地为例

倪喆，刘之葵，李善梅，董兵红，席丹妮，谭明灿   

  1. （桂林理工大学 土木与建筑工程学院，广西桂林 541004)
  • 收稿日期:2020-12-22 修回日期:2021-01-22 出版日期:2022-06-30 发布日期:2022-06-24
  • 通讯作者: 刘之葵(1968-)，男，博士，教授，研究方向为岩土工程。
  • 作者简介:倪 喆(1995-),男，在读硕士生，研究方向为岩土工程。
  • 基金资助:
    国家自然科学基金项目（41867039）；广西岩土力学与工程重点实验室基金项目（桂科能20-Y-XT-03）；南方石山地区矿山地质环境修复工程技术创新中心项目（CXZX2020002）

Influence of Water Content on Submerged Erosion of Gravel-Sand Foundation A Case Study of Li River Terrace in Guilin

NI Zhe, LIU Zhikui, LI Shanmei, DONG Binghong, XI Danni, TAN Mingcan   

  1. (School of Civil and Architectural Engineering, Guilin University of Technology, Guilin 541004)
  • Received:2020-12-22 Revised:2021-01-22 Online:2022-06-30 Published:2022-06-24

摘要： 针对桂林市砾-砂二元结构如的基本特征，在漓江一级阶地现场取样，通过筛分实验，分成9个粒径组。利用自制的潜蚀变形仪，将试样分层击实，采用同一级配，在压实度不变的情况下，通过控制砂样含水率，研究不同含水率条件下对砾砂二元结构渗透潜蚀破坏的影响。实验结果表明，潜蚀速度与含水率有较大的关系，且细砂和砾砂都为各自最优含水率时，潜蚀速度相对较低；含水率对潜蚀速度稳定梯度影响不明显。

关键词: 砾-砂二元结构, 含水率, 压实度, 潜蚀速度

Abstract: The basic characteristics of the gravel-sand binary structure such as Guilin was evaluated by sampling at the first terrace of Lijiang River and the collected samples were divided into nine different grain size groups throughout the sieving analyses. By using the in-house developed erosion deformation test device, the samples with the same gradation were prepared with the compaction in lifts. Under the condition of the same degree of compaction, the influence of different moisture contents on the seepage erosion failure of in the gravel-sand binary structure was evaluated by controlling the moisture content of sand samples. The test results show that the moisture content has a great influence on the erosion speed, and when the fine sand and the gravelly sand are at the optimal moisture content, the erosion speed is relatively low. At the same time, the test results show that the influence of the moisture content on the stability gradient of the erosion velocity is not obvious.

Key words: gravel-sand binary structure, moisture content, degree of compaction, erosion speed

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