Study on expansion-shrinkage characteristics and deformation model for expansive
soils in canal slope of South-to-North Water Diversion Project

LIU Zu-qiang; LUO Hong-ming; ZHENG Min; SHI Yun-jiang

doi:10.16285/j.rsm.2018.2101

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Study on expansion-shrinkage characteristics and deformation model for expansive soils in canal slope of South-to-North Water Diversion Project

更新时间：2026-06-25

- Study on expansion-shrinkage characteristics and deformation model for expansive soils in canal slope of South-to-North Water Diversion Project
- Vol. 40, Issue S1, Pages: 409-414(2019)
- 作者机构：
  
  1. 长江空间信息技术工程有限公司(武汉),湖北,武汉,430010
  2. 湖北省水利信息感知与大数据工程技术研究中心,湖北,武汉,430010
  3. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北,武汉,430071
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2018.2101
  CLC： TU448
- Online First：17 August 2019，
  
  Published：2019
- 稿件说明：
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LIU Zu-qiang, LUO Hong-ming, ZHENG Min, et al. Study on expansion-shrinkage characteristics and deformation model for expansive soils in canal slope of South-to-North Water Diversion Project[J]. 2019, 40(S1): 409-414.
DOI：

LIU Zu-qiang, LUO Hong-ming, ZHENG Min, et al. Study on expansion-shrinkage characteristics and deformation model for expansive soils in canal slope of South-to-North Water Diversion Project[J]. 2019, 40(S1): 409-414. DOI： 10.16285/j.rsm.2018.2101.

摘要

南水北调工程膨胀土渠坡变形受大气降雨、蒸发等干湿循环作用较为显著，揭示渠顶膨胀土在干湿循环作用下的胀缩变形和垂直位移变形特征，可为渠坡的稳定性评价与处治方案提供依据。利用膨胀土室内胀缩特性试验结果，结合垂直位移量、含水率、降雨量、蒸发量和气温监测等现场观测数据，分析渠顶位移量和影响因子间关联度，建立了干湿循环作用下渠顶膨胀土的竖向变形模型。研究结果表明，以含水率、降雨量、蒸发量等构成的胀缩因子与渠顶垂直位移呈负相关关系，胀缩因子引起垂直位移分量较小；温度因子与渠顶垂直位移呈正相关关系，对渠顶垂直变形有较大影响，是影响渠顶变形的主要因素；渠坡开挖（时效因子）在施工初期对渠顶垂直变形有一定的影响，开挖完成后对渠顶垂直变形影响甚微。

Abstract

The deformation of expansive soil slope of the South-to-North Water Transfer Project is significantly affected by the dry-wet cycles such as rainfall and evaporation. The characteristics of expansion-shrinkage deformation and vertical displacement deformation of the expansive soil at canal top under dry-wet cycling are revealed

which provides a basis for the stability evaluation and treatment plan of the slope. Based on the experimental results of the expansion-shrinkage characteristics of expansive soil

combining the field observation data such as vertical displacement

water content

rainfall

evaporation and temperature monitoring

the correlation between the displacement of the canal top and the influence factor is analyzed

and a model for vertical deformation of the expansive soil at canal top under the action of dry-wet cycling is established. The results show that the expansion-shrinkage factor composed of water content

rainfall and evaporation are negatively correlated with the vertical displacement of the canal top. The vertical displacement component is smaller due to the expansion-shrinkage factor. The temperature factor is positively correlated with the vertical displacement of the canal top

and has a great influence on the vertical deformation of the canal top

which is the main factor affecting the deformation of the canal top. The slope excavation(time-effect factor) has a certain influence on the vertical deformation of the canal top at the initial stage of construction

but little influence on the vertical deformation of canal top after excavation.

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