侧限下地基泥岩浸水膨胀变形大尺寸模型试验∗

王炳忠

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侧限下地基泥岩浸水膨胀变形大尺寸模型试验∗

更新时间：2025-09-25

- 侧限下地基泥岩浸水膨胀变形大尺寸模型试验∗
- Large Scale Model Test of Water Swelling Deformation of Mudstone under Lateral Confinement
- 防灾减灾工程学报 2020年第3期页码：337-342
- 作者机构：
  
  兰州交通大学土木工程学院,甘肃,兰州,730070
- 作者简介：
- 基金信息：
  
  长江学者和创新团队发展计划滚动支持(IRT_15R29)、中国铁路总公司科技研究开发计划课题（Z2015-G001）、青年人才托举工程（2015QNRC001）、甘肃省基础研究创新群体（145RJIA332）资助
- DOI：
  中图分类号： TU443
- 纸质出版：2020
- 稿件说明：
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王炳忠,王起才,张戎令,王天双,张唐瑜,梁柯鑫.侧限下地基泥岩浸水膨胀变形大尺寸模型试验∗[J].防灾减灾工程学报,2020,(3):337-342

WANG Bingzhong. Large Scale Model Test of Water Swelling Deformation of Mudstone under Lateral Confinement[J]. 2020, (3): 337-342.
王炳忠,王起才,张戎令,王天双,张唐瑜,梁柯鑫.侧限下地基泥岩浸水膨胀变形大尺寸模型试验∗[J].防灾减灾工程学报,2020,(3):337-342 DOI：

WANG Bingzhong. Large Scale Model Test of Water Swelling Deformation of Mudstone under Lateral Confinement[J]. 2020, (3): 337-342. DOI：

摘要

膨胀泥岩浸水后常常导致地基等上拱变形病害，为研究膨胀泥岩浸水膨胀变形规律，以兰新铁路第二双线一处典型膨胀地段泥岩为研究对象，对 3 种不同厚度的重塑泥岩分别进行不同吸水量下的大比例膨胀变形模型试验，模型尺寸为100 cm×60 cm×50 cm（长×宽×高）。试验结果表明：不同厚度膨胀时程曲线随浸水量分级增加呈“阶梯形”增长，前期浸水膨胀变形量增长迅速，随含水量增加逐渐变缓，土体膨胀速率与渗透速率密切相关；浸水初期土体含水量由浸水管向四周梯度递减，膨胀变形量与含水量具有一致性。膨胀变形量增加随吸水量增加逐渐减小，膨胀变形量与吸水量呈良好的双曲线关系。厚度越大，膨胀变形量也越大，且膨胀变形量增加随厚度增加逐渐减小，土体厚度作为上覆荷载对膨胀量起抑制作用。

Abstract

Immersion of expansive mudstone into water often leads to arch deformation damage of foundation

etc. In order to understand the expansive deformation of expansive mudstone

a typical expansive mudstone of the second double tracks of Lanxin Railway was used. In this study

large-scale expansive deformation model tests were conducted under different water absorption on three kinds of reshaping mudstone with different thickness. The size of the model is 100cm × 60cm × 50 cm (length × width × height). The experimental results show that for expansion of different thickness

the time travel curve shows a “ladder-shaped” growth law along with grading increase of water immersion amount. In the early stage of expansion after immersion into water

the deformation increases rapidly

and then gradually slows down with the increase of water content

and the expansion rate of soil mass is closely related to the permeation rate. In the initial stage of immersion into water

the water content in the soil mass shows gradient decrease from the immersion pipe to the surrounding

and the expansive deformation amount is consistent with the water content. The amount of swelling deformation decreases with the increase of water absorption

and there is a good hyperbolic relationship between swelling deformation and water absorption. The larger the thickness is

the greater amount of expansive deformation is

and the increase of expansion deformation gradually decreases with the increase of thickness. As overburden load

the thickness of soil mass restrains the expansion amount. The test results can be used for analogy and reference in the design and construction of an expansive mudstone area in the future.

关键词

Keywords

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