高地下水位深挖方膨胀土渠坡运行期变形特征及其影响因素

doi:10.3880/j.issn.1006-7647.2022.05.014

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高地下水位深挖方膨胀土渠坡运行期变形特征及其影响因素

DOI:

10.3880/j.issn.1006-7647.2022.05.014

作者:

作者单位:

(1.南京水利科学研究院大坝安全与管理研究所, 江苏南京210029;2.中国南水北调集团中线有限公司,北京100038)

作者简介:

胡江(1983—),男,正高级工程师,博士,主要从事水工结构老化病害及安全监控研究。E-mail:huj@nhri.cn

通讯作者:

中图分类号:

TV223

基金项目:

国家自然科学基金(52179138,51879169)；中国博士后科学基金(2022M711667)

Slope deformation characteristics and influencing factors of deeply excavated expansive soil canal slopes with high groundwater level during operation periods

Author:

Affiliation:

(1.Dam Safety Management Department, Nanjing Hydraulic Research Institute, Nanjing 210029, China;2.China South-to-North Water Diversion Central Route Corporation Limited, Beijing 100038, China)

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摘要:

以一调水工程南阳盆地一段高地下水位深挖方膨胀土渠坡为例,依据地质勘察、施工期和运行期资料,总结渠坡变形后的外观病害特征,阐述变形体潜在剪切变形带深度和几何形态,从工程与水文地质(土体膨胀性、裂隙结构面和地下水)、降雨等内外因素综合分析剪切变形机制,评判常用的防渗排水和加固支护处理措施的效果。结果表明:变形渠段地下水为上层滞水,埋深较浅,运行期受降雨影响明显,在多年反复湿胀干缩效应作用下,滞水区中短小裂隙逐步贯通,抗剪强度降低,渠坡产生侧向蠕动变形；潜在剪切变形带底面近水平、后缘面陡倾；防渗和排水措施能排出地下水并降低地下水位,抗滑桩和伞形锚等加固支护措施阻滑效果较好。

Abstract:

A deeply excavated expansive soil slope of a canal section with high groundwater level in the Nanyang basin of a water transfer project was investigated. According to the data of geological survey and the data during the construction and operation periods, the appearance disaster characteristics of the canal slope after deformation were summarized. The depth and the geometry of the potential shear deformation zone of the deformed body were described. The deformation mechanism was comprehensively analyzed from the internal and external factors such as engineering geology and hydrogeology

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胡江,杨宏伟,李星,等.高地下水位深挖方膨胀土渠坡运行期变形特征及其影响因素[J].水利水电科技进展,2022,42(5):94-101.(HU Jiang, YANG Hongwei, LI Xing, et al. Slope deformation characteristics and influencing factors of deeply excavated expansive soil canal slopes with high groundwater level during operation periods[J]. Advances in Science and Technology of Water Resources,2022,42(5):94-101.(in Chinese))

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收稿日期:2021-09-17
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在线发布日期: 2022-09-08
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