岩土力学 ›› 2022, Vol. 43 ›› Issue (9): 2383-2390.doi: 10.16285/j.rsm.2021.1890

• 基础理论与实验研究 • 上一篇    下一篇

絮凝−真空−电渗联合加固滩涂软土的模型试验研究

张雷1, 2，吕延栋1，王炳辉1, 2，金丹丹2, 3，竺明星1，方晨4   

  1. 1. 江苏科技大学 土木工程与建筑学院，江苏 镇江 212100；2. 南京工业大学 岩土工程研究所，江苏 南京 211816； 3. 江苏大学 土木工程与力学学院，江苏 镇江 212013；4. 内布拉斯加大学 林肯分校 土木工程系，美国 林肯 68583
  • 收稿日期:2021-11-08 修回日期:2022-04-28 出版日期:2022-09-12 发布日期:2022-09-12
  • 通讯作者: 王炳辉，男，1980年生，博士，副教授，主要从事岩土地震工程、软土地基处理方面的研究。E-mail: wbhchina@126.com E-mail: lei.zhang@just.edu.cn
  • 作者简介:张雷，男，1989年生，博士，讲师，主要从事软土地基处理、环境岩土工程方面的研究
  • 基金资助:
    江苏省自然科学基金（No.BK20200996）；中国博士后基金面上项目（No.2020M681566）；国家自然科学基金（No.51978317）；江苏省博士后科研资助计划（No.2021K493C）

Laboratory study of consolidation of marine soft soil using flocculation-vacuum preloading-electro-osmosis

ZHANG Lei1, 2, LÜ Yan-dong1, WANG Bing-hui1, 2, JIN Dan-dan2, 3, ZHU Ming-xing1, FANG Chen4   

  1. 1. School of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212100, China; 2. Institute of Geotechnical Engineering, Nanjing Tech. University, Nanjing, Jiangsu 211816, China; 3. Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 4. Faculty of Civil Engineering, University of Nebraska-Lincoln, Lincoln, USA 68583
  • Received:2021-11-08 Revised:2022-04-28 Online:2022-09-12 Published:2022-09-12
  • Supported by:
    This work was supported by the National Natural Science Foundation of Jiangsu Province (BK20200996), China Postdoctoral Science Foundation (2020M681566), the National Natural Science Foundation of China (51978317) and Jiangsu Postdoctoral Research Funding Program (2021K493C).

PDF (Chinese)

241

摘要：

针对真空预压作用下排水板淤堵与排水条件受限等问题，提出絮凝−真空−电渗联合加固法。首先通过沉降柱试验确定合适的有机絮凝剂，然后采用该絮凝剂，分别在 48 h（开始介入真空预压，固结度为0 ）、60 h（排水速率明显下降，固结度为60%）及 84 h（排水速率近乎 0，固结度为 80%）时介入电渗，开展不同电渗介入时间的絮凝−真空−电渗联合加固试验。试验从排水量、十字板剪切强度、含水率与孔压等对比分析联合加固的有效性，确定其最佳电渗介入时间。试验结果表明：当固结度为 80% 时介入电渗，絮凝−真空−电渗联合加固法能够有效地抑制排水速率减小的趋势，增长有效排水时间。同时，土体的抗剪强度和承载力亦得到大幅提升，孔压消散更加均匀。此外，在阳离子聚丙烯酰胺絮凝剂的作用下，初始排水速率快，在一定程度上使土体的渗透性得到提升，有效地解决了排水板淤堵问题，说明絮凝−真空−电渗联合加固法具有较强的优越性。

关键词: 真空预压, 电渗, 絮凝, 十字板剪切强度, 孔隙水压力

Abstract:

To solve the technical issues in vacuum preloading method, including the sediment clogging of drains and the limitation of drainage conditions, this study investigated vacuum preloading combined with flocculation and electro-osmosis consolidation for marine soft soil. A series of column settling tests was conducted to determine the optimal organic flocculant for the combined method. With the selected organic flocculant, laboratory tests were performed on the soil samples using the combined consolidation method, in which the electro-osmosis was added at different time moments. The tests considered three representative cases at different time moments: (i) at 48 h, i.e., the initial stage of vacuum preloading with the consolidation degree of 0; (ii) at 60 h, i.e., the obvious reduction in the dewatering speed with the consolidation degree of 60%; and (iii) at 84 h, i.e., the dewatering speed of 0 with the consolidation degree of 80%. The effectiveness of the combined method was evaluated using the tested results, including water discharge, soil vane shear strength, water content, and pore water pressure, along with the determination of the best time for adding the electro-osmosis. The results indicated that the combined method effectively delayed the decrease of dewatering efficiency and significantly increased dewatering duration. Also, the shear strength and load-bearing capacity of the consolidated soil were clearly improved, with the evenly dissipated pore water pressure. In addition, the cationic polyamide was the optimal flocculant for the combined method, which enhanced the initial dewatering speed and improved the permeability of the soft soil to solve the sediment clogging in the plastic board during the vacuum preloading. This research demonstrated the effectiveness of vacuum preloading combined with flocculation and electroosmosis consolidation for soil improvement.

Key words: vacuum preloading, electro-osmosis consolidation, flocculant, cross plate shear strength, pore water pressure

中图分类号: TU411
[1] 吴倩婵, 章荣军, 徐志豪, 杨钊, 郑俊杰, . 絮凝剂对固化流泥强度行为及变形特性的影响研究[J]. 岩土力学, 2025, 46(S1): 205-216.
[2] 董林, 陈强, 夏坤, 李彦苍, 李燕, 王晓磊. 细粒土黏性对液化与循环软化特性影响研究[J]. 岩土力学, 2025, 46(S1): 228-237.
[3] 倪睿思, 肖世国, 吴兵, 梁瑶, . 基于非线性井阻的饱和软弱土无砂增压式真空预压分析方法[J]. 岩土力学, 2025, 46(7): 2160-2172.
[4] 董建华, 杨博, 田文通, 吴晓磊, 何鹏飞, 赵律华, 连博, . 新型防液化抗滑桩研发与地震响应振动台模型试验研究[J]. 岩土力学, 2025, 46(4): 1084-1094.
[5] 常仕奇, 董晓强, 刘晓凤, 李江山, 刘晓勇, 张豪儒, 黄寅豪, . 水位变动引发干法赤泥堆场坝体失稳的模型试验与数值模拟研究[J]. 岩土力学, 2025, 46(4): 1122-1130.
[6] 杨少朋, 杨爱武, 许福军, . 改性纤维排水板真空预压加固吹填软土试验研究[J]. 岩土力学, 2025, 46(3): 789-797.
[7] 王兵, 胡小波, 孔楠楠. 真空联合电渗加固超细颗粒疏浚土试验研究[J]. 岩土力学, 2025, 46(11): 3523-3533.
[8] 孙宏磊, 徐振恺, 刘斯杰, 蔡袁强, . 考虑土柱发展过程的淤泥真空预压大应变固结计算[J]. 岩土力学, 2025, 46(1): 133-146.
[9] 杨耀辉, 辛公锋, 陈育民, 李召峰, . 排水桩-网复合地基处置可液化路堤地基的振动台试验研究[J]. 岩土力学, 2024, 45(S1): 178-186.
[10] 王彪, 陈星欣, 尹清锋, 郭力群, 何明高, . 软土地层盾构地中对接法孔压扰动规律研究[J]. 岩土力学, 2024, 45(S1): 535-549.
[11] 崔允亮, 潘方然, 高楥园, 金子原, . 真空预压淤堵区渗透系数的计算方法[J]. 岩土力学, 2024, 45(7): 2085-2093.
[12] 谢森林, 胡安峰, 肖志荣, 汪美慧, 胡训健, 陈俞超, . 基于广义Voigt模型的半渗透边界隧道周围饱和软土固结分析[J]. 岩土力学, 2024, 45(7): 2024-2036.
[13] 金丹丹, 鲁先东, 王炳辉, 施展, 张雷, . 冲击荷载下含夹层饱和砂土孔压变化规律分析[J]. 岩土力学, 2024, 45(4): 1081-1091.
[14] 刘景锦, 罗学思, 雷华阳, 郑刚, 罗昊鹏, . 等应变条件下增压式真空预压固结解析解[J]. 岩土力学, 2024, 45(3): 809-821.
[15] 李尧, 李嘉评. 复杂初始应力状态下松砂多向循环单剪特性[J]. 岩土力学, 2023, 44(9): 2555-2565.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
No Suggested Reading articles found!
版权所有 © 《岩土力学》编辑部
地址：湖北武汉武昌小洪山中国科学院武汉岩土力学研究所(430071)　邮编：200042　电话：027-87198484　E-mail: ytlx@whrsm.ac.cn
本系统由北京玛格泰克科技发展有限公司设计开发