岩土力学 ›› 2019, Vol. 40 ›› Issue (9): 3457-3464.doi: 10.16285/j.rsm.2019.1285

• 基础理论与实验研究 • 上一篇    下一篇

侵蚀性环境对地下结构渗透和力学特性影响研究

王冲1, 2，胡大伟1, 2，任金明3，周辉1, 2，卢景景1, 2，刘传新4   

  1. 1. 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；2. 中国科学院大学，北京100049； 3. 中国水电顾问集团华东勘测设计研究院有限公司，浙江 杭州 310014；4. 苏交科集团股份有限公司，江苏 南京 211112
  • 收稿日期:2018-07-18 出版日期:2019-09-10 发布日期:2019-09-05
  • 通讯作者: 胡大伟，男，1981年生，博士，研究员，主要从事地下工程多场耦合方面的研究工作。E-mail：dwhu@whrsm.ac.cn E-mail:1148316899@qq.com
  • 作者简介:王冲，男，1993年生，硕士研究生，主要从事地下结构长期稳定性方面的研究工作
  • 基金资助:
    国家重点研发计划资助（973项目）（No.2018YFC0809601，No.2018YFC0809600）；国家自然科学基金资助项目（No.51479193，No.51779252）；湖北省技术创新专项重大项目（No.2017AAA128）；中科院百人计划项目资助；武汉市“黄鹤英才（科技）计划”资助项目。

Influence of erosive environment on permeability and mechanical properties of underground structures

WANG Chong1, 2, HU Da-wei1, 2, REN Jin-ming3, ZHOU Hui1, 2, LU Jing-jing1, 2, LIU Chuan-xin4   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. HydroChina Huadong Engineering Corporation, Hangzhou, Zhejiang 310014, China; 4. Jiangsu Transportation Institute, Nanjing, Jiangsu 211112, China
  • Received:2018-07-18 Online:2019-09-10 Published:2019-09-05
  • Supported by:
    This work was supported by the National Key R & D Program of China(973 Program)(2018YFC0809601, 2018YFC0809600), the National Natural Science Foundation of China (51479193, 51779252), the Major Projects of Technical Innovation in Hubei(2017AAA128), the “100 Talent Program” of the Chinese Academy of Sciences and Wuhan Yellow Crane Talents(Science) Plan of China.

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摘要： 环境污染造成地下结构侵蚀劣化，使得地下结构面临严峻的长期稳定性问题。通过50 g/L Na2SO4溶液、50 g/L NaCl溶液以及含有50 g/L Na2SO4 + 50 g/L NaCl的垃圾渗滤液的浸泡侵蚀试验，研究了经上述溶液侵蚀后混凝土试样在不同围压下的气体渗透特性、氯离子渗透特性以及力学特性。结果表明：（1）经不同溶液侵蚀后试样的渗透率与所承受的围压大小密切相关。同一侵蚀时间下，随着围压的增大，渗透率逐渐减小。经垃圾渗滤液侵蚀后的试样渗透率随侵蚀时间线性增加，且围压越小，增大的速率越大；经硫酸钠溶液、氯化钠溶液侵蚀后的试样渗透率总体先减小后增大；经3种不同溶液侵蚀后，试样渗透率对应力的敏感程度均有所提高。（2）经3组溶液侵蚀后试样单轴抗压强度变化分为线性增加、缓慢下降两个阶段，但垃圾渗滤液侵蚀后的试样强度始终为最小值。弹性模量也呈现出相似的变化规律。（3）在同一侵蚀深度处，垃圾渗滤液侵蚀后的试样自由氯离子含量比氯化钠溶液侵蚀后的试样低20%～50%，垃圾渗滤液侵蚀下混凝土试样被氯离子侵蚀的程度比氯化钠溶液侵蚀下混凝土试样低。（4）气体渗透率随侵蚀的进行而变化最为明显，比单轴抗压强度、氯离子扩散系数更适用于评价地下混凝土结构长期稳定性。研究结果可为侵蚀性环境下地下结构长期稳定性分析提供理论依据。

关键词: 垃圾渗滤液侵蚀, 地下结构, 渗透特性, 力学特性

Abstract: Due to environmental pollution, the underground structure gradually deteriorates, which causes severe long-term stability problems of the underground structure. In this study, the immersion erosion tests were first carried out on concrete specimens by soaking in the 50 g/L Na2SO4 solution, 50 g/L NaCl solution and landfill leachate containing 50 g/L Na2SO4 + 50 g/L NaCl, respectively. Then the gas permeability under different confining pressures, chloride permeability and mechanical properties of the eroded concrete specimens were studied. The results show that the permeability coefficient of the specimens after immersion in different solutions is closely related to the confining pressure. Under the same erosion time, the permeability coefficient gradually decreases with the increase of confining pressure. The permeability of the specimen under continuous immersion by landfill leachate increases linearly with the time of erosion, and the lower the confining pressure is, the greater the rate of the increase is. While the permeability of the specimens exposed to Na2SO4 and NaCl solutions decreases first and then increases. Generally, under immersion in three kinds of solutions, the permeability sensitivity of specimens to confining pressure is improved. The uniaxial compressive strength of the specimens after exposed to different solutions is divided into two stages: linear increase and slow decrease. However, the strength of the specimen exposed to landfill leachate is the lowest. The elastic modulus also presents a similar pattern. At the same erosion depth, the free chloride content of the specimen after the landfill leachate erosion is 20%?50% lower than that of the specimen after the erosion of the NaCl solution. In addition, the erosion degree of the concrete specimen by the chloride ions in the landfill leachate is lower than that of the concrete specimen by the NaCl solution. Compared with uniaxial compressive strength and chloride diffusion coefficient, the gas permeability changes the most obviously by the erosion, which is more suitable for evaluating the long-term stability of the concrete structure. The research results can provide a theoretical basis for the long-term stability analysis of underground structures under corrosive environment.

Key words: landfill leachate erosion, underground structure, permeability, mechanical properties

中图分类号: 

  • TU 411
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