›› 2016, Vol. 37 ›› Issue (S1): 215-225.doi: 10.16285/j.rsm.2016.S1.028

• 基础理论与实验研究 • 上一篇    下一篇

磷酸镁水泥固化铅污染土的应力-应变特性研究

张亭亭,李江山,王 平,李振泽   

  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
  • 收稿日期:2015-11-10 出版日期:2016-06-16 发布日期:2018-06-09
  • 作者简介:张亭亭,男,1990年生,硕士研究生,主要从事污染土多相体作用效应与修复技术方面的研究工作。
  • 基金资助:
    国家自然科学基金(No. 51479194);中国科学院学科交叉与合作创新团队项目(No. Y426011C01);武汉市高新技术成果转化及产业化项目(No. 2013060803010403);岩土力学与工程国家重点实验室资助课题(No. Z015003)。

Experimental study of stress-strain properties of lead-contaminated soils treated by magnesium phosphate cement

ZHANG Ting-ting, LI Jiang-shan, WANG Ping, LI Zhen-ze   

  1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China
  • Received:2015-11-10 Online:2016-06-16 Published:2018-06-09
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51479194), the Cross-disciplinary Collaborative Teams Program for Science, Technology and Innovation, the Chinese Academy of Sciences (Y426011C01), the Wuhan High and New Technology Achievements Transformation and Industrialization Project (2013060803010403) and the State Key Laboratory of Geomechanics and Geotechnical Engineering funding issues (Z015003).

摘要: 采用磷酸镁水泥(MPC)对铅污染土进行固化/稳定化处理。基于无侧限抗压强度试验,系统地研究了MPC添加量、养护龄期、水土比和污染土铅含量对固化污染土应力-应变特性的影响规律。结果表明,固化污染土的应力-应变曲线呈现出3个阶段,即压密阶段、弹性阶段和破坏阶段;随着MPC添加量和养护龄期的增加,固化污染土的抗压强度qu增大,变形模量E50增大,破坏应变εf减小;水土比和铅含量对固化土的抗压强度qu和E50均存在临界值,分别为0.45和500 mg/kg,低于临界值时,固化土的qu和E50随着铅含量和水土比的增加而增加,εf随着qu增加呈幂函数规律减小,E50随着qu的增加呈线性增加,E50随着εf的增加呈幂函数规律减小。

关键词: 固化/稳定化, 铅污染土, 无侧限抗压强度, 变形模量, 破坏应变

Abstract: Magnesium phosphate cement(MPC) is used to stabilize/solidify lead-contaminated soils. Unconfined compressive strength tests are conducted to investigate the variation of stress-strain properties of MPC treated lead-contaminated soils along with MPC dosage, curing time, water content and lead concentration. The results show that stress-strain curves of lead-contaminated soils can be divided into three stages: compaction stage, elastic stage and destruction stage. The qu, and E50 increase significantly with MPC dosage and curing time, while the εf change oppositely. There are threshold values for water content and lead concentration in terms of its influence on qu and E50, where qu is the threshold value of 0.45 and E50 is the threshold value of 500 mg/kg. The qu, and E50 increase with the lead concentration and water content before they reach the threshold value. The qu decreased as power function with the increase of εf. E50 increase linearly with qu while decrease monomially with εf, where below the critical value.

Key words: solidification/stabilization(S/S), lead contaminated soil, unconfined compressive strength, deformation modulus, failure strain

中图分类号: 

  • TU 473.1
[1] 杨钊, 乔春生, 陈松. 基于蒙特卡罗法的岩体变形模量统计 特征及参数权重分析[J]. 岩土力学, 2020, 41(S1): 271-278.
[2] 李敏, 孟德骄, 姚昕妤. 基于温度效应下二灰固化石油污染滨海盐渍土 力学特性优化固化需求[J]. 岩土力学, 2020, 41(4): 1203-1210.
[3] 高运昌, 高盟, 尹诗, . 聚氨酯固化海砂的静力特性试验研究[J]. 岩土力学, 2019, 40(S1): 231-236.
[4] 沈泰宇, 汪时机, 薛乐, 李贤, 何丙辉, . 微生物沉积碳酸钙固化砂质黏性紫色土试验研究[J]. 岩土力学, 2019, 40(8): 3115-3124.
[5] 查甫生, 刘晶晶, 许龙, 邓永锋, 杨成斌, 储诚富, . 水泥−粉煤灰固化/稳定重金属污染土的电阻率 特性试验研究[J]. 岩土力学, 2019, 40(12): 4573-4580.
[6] 吕擎峰, 周 刚, 王生新, 霍振升, 马 博, . 固化盐渍土核磁共振微观特征[J]. 岩土力学, 2019, 40(1): 245-249.
[7] 陈瑞锋,田高源,米栋云,董晓强,. 赤泥改性黄土的基本工程性质研究[J]. , 2018, 39(S1): 89-97.
[8] 张亭亭,王 平,李江山,万 勇,薛 强,王士权, . 养护龄期和铅含量对磷酸镁水泥固化/稳定化铅污染土的固稳性能影响规律及微观机制[J]. , 2018, 39(6): 2115-2123.
[9] 王 春, 唐礼忠, 程露萍, 陈 源, 刘 涛, 韦永恒, . 高轴压和围压共同作用下矽卡岩受频繁动态扰动时的动力学特性[J]. 岩土力学, 2018, 39(12): 4537-4546.
[10] 章定文,项 莲,曹智国, . CaO对钙矾石固化/稳定化重金属铅污染土的影响[J]. , 2018, 39(1): 29-35.
[11] 许年春,吴同情,冯桥木,汪 魁,邵伟峰,. 土变形模量的柔性承载板测试研究[J]. , 2017, 38(S1): 496-700.
[12] 杜海民,马 巍,张淑娟,周志伟. 围压与含水率对冻结砂土破坏应变能密度影响特性研究[J]. , 2017, 38(7): 1943-1950.
[13] 王新志,王 星,刘海峰,孟庆山,朱长歧,. 珊瑚礁地基工程特性现场试验研究[J]. , 2017, 38(7): 2065-2070.
[14] 刘晋铭,欧忠文,肖寒冰,莫金川,杨康辉. 功能组分对固化土早期强度的影响研究[J]. , 2017, 38(3): 755-761.
[15] 邓友生,吴 鹏,赵明华,段邦政,. 基于最优含水率的聚丙烯纤维增强膨胀土强度研究[J]. , 2017, 38(2): 349-353.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!