岩土力学 ›› 2022, Vol. 43 ›› Issue (2): 432-442.doi: 10.16285/j.rsm.2021.1474

• 基础理论与实验研究 • 上一篇    下一篇

压实度对铁盐稳定化砷、锑污染土特性 的影响及机制研究

周实际1, 2, 3，杜延军1, 2，倪浩1, 2，孙慧洋1, 2，李江山3，杨玉玲1, 2, 3   

  1. 1. 东南大学 岩土工程研究所，江苏 南京 210096；2. 东南大学 江苏省城市地下工程与环境安全重点实验室，江苏 南京 210096； 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
  • 收稿日期:2021-09-01 修回日期:2021-11-24 出版日期:2022-02-11 发布日期:2022-02-22
  • 通讯作者: 杜延军，男，1972年生，博士，教授，博导，主要从事环境岩土工程、污染地块风险管控与修复技术方面的研究。E-mail: duyanjun@seu.edu.cn E-mail:shijizhou@seu.edu.cn
  • 作者简介:周实际，男，1989年生，博士研究生，主要从事重金属污染土固化稳定化技术方面的研究
  • 基金资助:
    国家重点研发计划项目（No. 2019YFC1806000）；国家自然科学基金（No. 41877248）；岩土力学与工程国家重点实验室开放基金课题 （No. Z019016）；江苏省研究生科研创新计划项目（No. KYCX18_0124）。

Mechanisms analysis of the effect of compaction degree on the properties of arsenic and antimony co-contaminated soil stabilized by ferric salts

ZHOU Shi-ji1, 2, 3, DU Yan-jun1, 2, NI Hao1, 2, SUN Hui-yang1, 2, LI Jiang-shan3, YANG Yu-ling1, 2, 3   

  1. 1. Institute of Geotechnical Engineering, Southeast University, Nanjing, Jiangsu 210096, China; 2. Jiangsu Key Laboratory of Urban Underground Engineering and Environmental Safety, Southeast University, Nanjing, Jiangsu 210096, China; 3. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China
  • Received:2021-09-01 Revised:2021-11-24 Online:2022-02-11 Published:2022-02-22
  • Supported by:
    This work was supported by the National Key R&D Program of China (2019YFC1806000), the National Natural Science Foundation of China (41877248), the Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering (Z019016) and the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX18_0124).

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摘要： 压实度是影响铁盐稳定化砷（As）、锑（Sb）污染土环境岩土工程特性的主要因素之一。通过测定不同压实度铁盐稳定剂（PFSC）稳定化As、Sb污染土无侧限抗压强度（UCS）、As和Sb浸出浓度、渗透系数 ，研究了压实度对PFSC稳定化As、Sb污染土环境岩土工程特性的影响规律。通过工业CT扫描、X射线光电子能谱（XPS）明确了稳定化土微观孔隙特征、元素价态随压实度的变化规律。As的浸出浓度随着压实度的提高先降低后略微上升，压实度为93%时，As的浸出浓度最低；Sb的浸出浓度随着压实度的提高而降低，压实度大于85%后趋于平稳。压实度由75%提高至96%，稳定化土UCS由4.26 kPa增大至43.78 kPa。压实度由80%提高至96%，稳定化土 由1.33×10–7 m/s 降低至2.81×10–9 m/s。工业CT扫描结果表明，随着压实度的提高，土体逐渐紧实，土体孔隙度由7.54%降低至5.30%。As、Sb和Fe的XPS分析结果表明，压实度增高促使As(V)、Sb(V)和Fe(III)分别向As(III)、Sb(III)和Fe(II)转化。揭示PFSC稳定化As、Sb污染土环境岩土工程特性参数随压实度的变化规律，能够为PFSC稳定化As、Sb污染土的工程应用和施工参数优化提供理论依据。

关键词: 压实度, 砷、锑污染土, 稳定化, 无侧限抗压强度, 浸出浓度, 渗透系数

Abstract: The compaction degree is one of the main factors affecting the geo-environmental properties of arsenic (As) and antimony (Sb) co-contaminated soil stabilized by ferric salts. The effect of compaction degree on the geo-environmental properties of As and Sb co-contaminated soil stabilized by a ferric salt-based stabilizer (PFSC, polymerized ferrous sulfate-Ca(OH)2) was investigated, including unconfined compressive strength (UCS), leached concentrations of As and Sb, and hydraulic conductivity . The varied characteristics of the micro pores and the element valence in the stabilized soil with compaction degree were clarified by adopting industrial CT scanning and X-ray photoelectron spectroscopy (XPS) in the study. The leached concentration of As decreased first and then increased with the increase of compaction degree, and reached the lowest as the compaction degree was 93%. The leached concentration of Sb decreased with the increase of compaction degree, while remained constant until the compaction degree was larger than 85%. When the compaction degree increased from 75% to 96%, the UCS of the stabilized soil increased from 4.26 kPa to 43.78 kPa. As the compaction degree increased from 80% to 96%, the of the stabilized soil decreased from 1.33×10–7 m/s to 2.81×10–9 m/s. In addition, it can be observed from the industrial CT results that the porosity of stabilized soil decreased from 7.54% to 5.30% with the increase of compaction degree, hence leading to the more compactness structures of the soil. The XPS analysis of the As, Sb and Fe indicated that increasing the compaction degree of stabilized soil promoted the transformation of As(V), Sb(V), and Fe(III) to As(III), Sb(III), and Fe(II), respectively. The study mainly focused on revealing the effects of compaction degree on the geo-environmental properties of As and Sb co-contaminated soil stabilized by PFSC, which will provide a theoretical basis for the engineering application and the optimization for the operation parameters of PFSC-stabilized As and Sb co-contaminated soil.

Key words: compaction degree, arsenic and antimony co-contaminated soil, stabilization, unconfined compressive strength, leached concentration, hydraulic conductivity

中图分类号: X 53
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