Experimental study of wetting expansibility and mechanical properties of weak expansive soil in Nanyang section of South-to-North Water Diversion Project

HE Fang-chan; LI Zong-kun

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Experimental study of wetting expansibility and mechanical properties of weak expansive soil in Nanyang section of South-to-North Water Diversion Project

更新时间：2026-06-25

- Experimental study of wetting expansibility and mechanical properties of weak expansive soil in Nanyang section of South-to-North Water Diversion Project
- Vol. 34, Issue S2, (2013)
- 作者机构：
  
  1. 郑州大学水利与环境学院,郑州,450001
  2. 河南省水利科学研究院河南省水利工程安全技术重点实验室,郑州,450003
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU431
- Online First：19 November 2013，
  
  Published：2013
- 稿件说明：
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HE Fang-chan, LI Zong-kun. Experimental study of wetting expansibility and mechanical properties of weak expansive soil in Nanyang section of South-to-North Water Diversion Project[J]. 2013, 34(S2).
DOI：

HE Fang-chan, LI Zong-kun. Experimental study of wetting expansibility and mechanical properties of weak expansive soil in Nanyang section of South-to-North Water Diversion Project[J]. 2013, 34(S2). DOI：

摘要

为了研究膨胀土自然状态下的膨胀及力学特性，对南阳弱膨胀土进行了不同增湿程度时的膨胀及力学特性试验。通过对相同初始条件下不同增湿程度膨胀土的膨胀特性试验得到，随着含水率的增大自然膨胀力和有荷自然膨胀率均是先逐渐增大后有小幅减小再逐渐稳定，无荷膨胀率的变化趋势是前期接近线性的增大后逐渐稳定。通过不同增湿程度膨胀土的抗剪强度试验，建立了黏聚力、内摩擦角与增湿含水率的线性关系曲线及关系式。对于已建工程，通过监测含水率得到膨胀土的实时膨胀特性以及抗剪强度，进而评价工程的安全运行情况。

Abstract

To study the expansibility and mechanical property of expansive soil in natural state

a series of expansion and mechanical property experiments

were carried out on Nanyang weak expansive soil with different humidifying degrees under the same initial condition. Through the experiments

the following conclusions are drawn: with the increase of humidifying moisture content

both natural expansibility and loaded natural expansion rate gradually increased at first

then slightly reduced

and finally became stable step by step. Load-free expansion rate almost increased in linear manner in earlier stage

then gradually became stable. By shearing strength experiments of expansive soil with different humidifying degrees

linear relation curve and relational expression between cohesion

internal friction angle and humidifying moisture content were developed. For completed projects

actual expansion property and shearing strength of expansive soil can be obtained by moisture content monitoring

which can be used to assess safety conditions of projects.

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