基于XCT扫描的黏性土-混凝土接触面剪切-渗流机理研究
Study on the Mechanism of Seepage Behaviour of the Cohensive Soil-Concrete Interface Based on XCT Scanning
投稿时间:2021-10-20  修订日期:2022-06-25
DOI:
中文关键词:  黏性土-混凝土接触面  剪切  渗流  微观结构
英文关键词:Clayey Soil-Concrete Interface  Shear  Seepage  Micro-Structure
基金项目:中国煤炭科工集团有限公司科技创新创业资金专项重点项目(2022-ZD002)
作者单位邮编
于际凯 徐州市水利建筑设计研究院 221116
刘千惠 煤炭科学研究总院 100013
摘要点击次数: 1491
全文下载次数: 0
中文摘要:
      高心墙堆石坝心墙和岸坡混凝土垫层接触部位错切变形大,常通过设置接触黏土来增强这一位置的变形协调性和抗渗透破坏能力。已有试验研究表明,黏性土和混凝土接触面一般在大剪切变形下的抗渗透破坏能力增强,但其机理尚不明确。本文对这一机理展开研究。对黏性土-混凝土接触面进行了一组剪切-渗流试验,并对其中一个试样在不同阶段于接触面附近取样,利用XCT试验对其进行微观结构扫描。通过图像处理软件对试样进行三维结构重建,并提取了在试验过程中不同相对位移下接触面附近土样的表观孔隙率分布。通过对表观孔隙率的分布及XCT扫描的典型截面图像分析,研究了黏性土-混凝土接触面在一定固结压力下发生大剪切变形后抗渗能力增强的机理。
英文摘要:
      The position of the core wall of the high-core rockfill dam and the concrete cushion on the bank slope are the key positions that are prone to seepage failure. The impermeability of this position is often enhanced by setting up contact with cohesive soil. According to a experimental study, the impermeability of the contact surface of cohesive soil and concrete is enhanced under large shear deformation, but the mechanism remained unclear. To study the mechanism, this paper takes soil samples near the contact surface in different stages of the cohesive soil-concrete interface shear-seepage test to perform XCT scanning, and then conduct three-dimensional reconstruction using image process program. The soil near the contact surface at different stages of the test is analyzed. The pore distribution and apparent porosity change of the sample reveal the mechanism of the enhanced impermeability of the cohesive soil-concrete interface under large shear deformation.
  查看/发表评论  下载PDF阅读器
关闭