酸性环境对污染土力学性质的影响

doi:10.12068/j.issn.1005-3026.2016.09.026

东北大学学报:自然科学版 ›› 2016, Vol. 37 ›› Issue (9): 1343-1348.DOI: 10.12068/j.issn.1005-3026.2016.09.026

酸性环境对污染土力学性质的影响

陈宇龙¹，张宇宁²，戴张俊³，陈行⁴

(1. 东京大学土木工程系，日本东京113-8656； 2. 重庆大学煤矿灾害动力学与控制国家重点实验室，重庆400030；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;4. 西南交通大学土木工程学院，四川成都610031)

收稿日期:2015-06-05 修回日期:2015-06-05 出版日期:2016-09-15 发布日期:2016-09-18
通讯作者: 陈宇龙
作者简介:陈宇龙(1988-)，男，四川泸州人，东京大学博士研究生.
基金资助:
国家自然科学基金资助项目(5140926).

Effects of Acidic Geoenvironmental on the Mechanical Properties of Polluted Soil

CHEN Yu-long¹， ZHANG Yu-ning²， DAI Zhang-jun³， CHEN Hang⁴

1. Department of Civil Engineering， University of Tokyo， Tokyo 113-8656， Japan； 2. State Key Laboratory of Coal Mine Disaster Dynamics and Control， Chongqing University， Chongqing 400030， China； 3. State Key Laboratory of Geomechanics and Geotechnical Engineering， Institute of Rock and Soil Mechanics， Chinese Academy of Sciences， Wuhan 430071， China； 4. School of Civil Engineering， Southwest Jiaotong University， Sichuan 610031， China.

Received:2015-06-05 Revised:2015-06-05 Online:2016-09-15 Published:2016-09-18
Contact: CHEN Yu-long
About author:-
Supported by:
-

摘要/Abstract

摘要： 为研究水-土化学作用的物理力学效应，人工方法制备经硫酸长期浸泡后造成的3 种不同pH环境下的土样试件，通过压缩变形性质、界限含水率和三轴固结不排水试验研究了不同酸性环境对污染土的力学性质和变形特性的影响.结果表明:硫酸浸泡过的土的压缩变形包括土体中孔隙水排出带来的弹性变形，还包括土体结构链接发生破坏和变位引起的塑性变形，导致其压缩量较原状土的压缩量大；pH值越低，硫酸溶液浓度越大，发生溶蚀破坏越剧烈，孔隙比越大，压缩系数越大，压缩模量越小；随着pH值的降低，扩散双电层被稀释，土的可塑性变弱，液限和塑性指数都减小；3种pH环境下土体均表现出应变硬化现象，pH=6.0时土体强度增高，而pH=4.0的土体强度低于蒸馏水浸泡过的土体；这与土壤黏粒部分所含的矿物成分密切相关；随着pH值的降低，土的有效应力路径都向左发生偏转，说明土体中的孔隙水压力的上升值和上升速度越大.

关键词: 污染土, 土-水化学作用, 酸性环境, 力学性质, pH

Abstract: In order to reveal the physical mechanics of soil-chemicals-water interaction， soil samples were artificially made in three different pH environments induced by immersed in sulfuric acid solution for a long term to carry out experiments on the compressible and deformable properties， consolidated undrained triaxial test and limit moisture content. Results showed that: the compressive deformation for soils immersed in sulfuric acid solution became greater， including the elastic deformation brought about by the remove of pore water and the plastic deformation resulting from the destruction of the soil structure and the conjugation; the lower the pH， the more the sulfuric acid contents， the severer the chemical corrosion， the greater the void ratio of soil， the greater the compression coefficient， the smaller the compression modulus; the pH reduction led to thinner diffuse double layer， so the plasticity became weaker and liquid limit and plasticity index were smaller; all the soils exhibited strain-hardening in the three different pH environments; the strength slightly increased when the pH of pore fluids decreased to 6.0 but significantly decreased at low pH conditions (pH=4.0)， which is related with the mineral composition of the clay fraction; as the pH decreased， effective stress path deflected towards the left due to greater increment rate of pore water pressure.

Key words: polluted soil, soil-chemicals-water interaction, acidic geo-environment, mechanical properties, pH

中图分类号:

TU441

陈宇龙，张宇宁，戴张俊，陈行. 酸性环境对污染土力学性质的影响[J]. 东北大学学报:自然科学版, 2016, 37(9): 1343-1348.

CHEN Yu-long， ZHANG Yu-ning， DAI Zhang-jun， CHEN Hang. Effects of Acidic Geoenvironmental on the Mechanical Properties of Polluted Soil[J]. Journal of Northeastern University Natural Science, 2016, 37(9): 1343-1348.

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酸性环境对污染土力学性质的影响

Effects of Acidic Geoenvironmental on the Mechanical Properties of Polluted Soil

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