院报 ›› 2019, Vol. 36 ›› Issue (4): 98-103.DOI: 10.11988/ckyyb.20170904

• 岩土工程 • 上一篇    下一篇

水泥-粉煤灰-脱硫石膏固化铅污染土强度特性及预测方法

崔进杨1,王强1,宫保聚2,姚韦靖1   

  1. 1.安徽理工大学 土木建筑学院,安徽 淮南 232001;
    2.中铁十一局集团第一工程有限公司,湖北 襄阳 441104
  • 收稿日期:2017-08-09 修回日期:2017-09-12 出版日期:2019-04-01 发布日期:2019-04-18
  • 通讯作者: 王强(1978-),男,安徽淮南人,副教授,博士,硕士生导师,主要从事岩土工程及环境岩土工程研究工作。E-mail:wangqiang0711@163.com
  • 作者简介:崔进杨(1992-),男,安徽蚌埠人,硕士研究生,主要从事岩土工程的研究工作。E-mail:cuijinyang0824@163.com
  • 基金资助:
    安徽省高校自然科学基金项目(KJ2016A831)

Lead-contaminated Soil Solidified by Cement-Flyash-Gypsum- desulphurized:Mechanical Strength Characteristics and Prediction Method

CUI Jin-yang1, WANG Qiang1, GONG Bao-ju2, YAO Wei-jing1   

  1. 1.School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001, China;
    2.The First Engineering Company of China Railway 11 Bureau Group, Xiangyang 441104, China
  • Received:2017-08-09 Revised:2017-09-12 Online:2019-04-01 Published:2019-04-18

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摘要： 为了研究复合水泥材料固化铅污染土的强度特性,采用水泥、粉煤灰与脱硫石膏混合形成的固化剂(CFG)对铅污染土进行固化处理,基于正交试验的方法进行无侧限抗压强度测试,研究铅离子浓度与CFG掺量对土体强度特性的影响规律。结果表明:固化土的抗压强度随CFG掺量增加而增大,随铅离子浓度增加而降低;养护7 d前铅离子浓度和固化剂掺量对土体抗压强度的影响,前者大于后者,而7 d后后者大于前者;在3,7 d时2种因素对于土体的强度的影响均较小,在14 d时该影响大幅提升,到28 d时影响特别显著。结合试验成果,提出了基于养护龄期和CFG掺量的强度预测公式,研究成果可供从事铅污染土修复工作的科研人员参考。

关键词: 复合水泥材料, 正交试验, 无侧限抗压强度, 铅污染土, 粉煤灰, 脱硫石膏, 强度预测

Abstract: Orthogonal unconfined compression test was conducted on lead-contaminated soil solidified by curing agent CFG (cement mixed with flyash and desulphurized gypsum) to investigate the strength characteristics of treated lead-contaminated soils varying with lead ion concentration and CFG dosage. Results reveal that the unconfined compressive strength of stabilized soils increases with the growth of CFG dosage, while reduces with the climbing of lead ion concentration. In the first seven days of curing, the effect of lead ion concentration is greater than that of curing agent dosage; after seven days, the influence of the dosage of curing agent is greater than that of lead ion concentration. At 3 d and 7 d of curing, the influences of both factors on soil strength are small, while at 14 d the influence greatly increases, and at 28 d, the effect is especially significant. Furthermore, the formula of strength prediction based on curing age and CFG dosage is proposed as a reference for the treatment of lead-contaminated soil.

Key words: composite cement material, orthogonal test, unconfined compressive strength, lead-contaminated soil, flyash, desulphurized gypsum, strength prediction

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