岩土力学 ›› 2020, Vol. 41 ›› Issue (11): 3705-3713.doi: 10.16285/j.rsm.2020.0262

• 基础理论与实验研究 • 上一篇    下一篇

考虑淤堵效应的疏浚淤泥真空固结沉降计算

蔡袁强1, 2,周岳富1,王鹏3,史吏2,王军3   

  1. 1. 哈尔滨工业大学(深圳)土木与环境工程学院,广东 深圳 518055;2. 浙江工业大学 土木工程学院,浙江 杭州 310023; 3. 温州大学 建筑与土木工程学院,浙江 温州 325035
  • 收稿日期:2020-01-09 修回日期:2020-04-13 出版日期:2020-11-11 发布日期:2020-12-25
  • 作者简介:蔡袁强,男,1965年生,博士,教授,主要从事基础工程学、土动力学、软土地基处理等方面的教学与研究工作
  • 基金资助:
    国家重点研发计划重点专项(No. 2016YFC08008020);国家自然科学基金国际(地区)合作与交流项目(No. 51620105008);国家自然科学基金项目(No. 51778499, No. 51478365, No. 51879234, No. 51622810)

Calculation on the settlement of dredged slurry treated by vacuum preloading method with consideration of clogging effects

CAI Yuan-qiang1, 2, ZHOU Yue-fu1, WANG Peng3, SHI Li2, WANG Jun3   

  1. 1. School of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen, Guangdong 518055, China; 2. College of Civil Engineering, Zhejiang University of Science and Technology, Hangzhou, Zhejiang 310023, China; 3. College of Architecture and Civil Engineering, Wenzhou University, Wenzhou, Zhejiang 325035, China
  • Received:2020-01-09 Revised:2020-04-13 Online:2020-11-11 Published:2020-12-25
  • Supported by:
    This work was supported by the National Key R&D Program of China (2016YFC0800200), the Projects of International Cooperation and Exchanges NSFC (51620105008) and the National Natural Science Foundation of China ( 51778499, 51478365, 51879234, 51622810).

摘要: 疏浚淤泥含水率高、强度极低,真空梯度作用下排水板周围会快速形成致密“土柱”,导致排水固结能力迅速下降,即出现淤堵现象。由疏浚淤泥真空固结室内模型试验获得了出水量变化情况和土体含水率、渗透系数的时空分布情况,确定了排水体周围淤堵区的形成时间与范围,提出了考虑时间效应与淤堵效应的真空度传递模式,同时考虑疏浚淤泥土体压缩和渗透的非线性,建立了考虑淤堵效应的固结分析模型,获得了相应的解析解,通过与已有数据和现场试验结果对比验证了该解答的有效性。利用该解析解,分析了真空度传递模式、淤堵系数λ和淤堵比c对沉降的影响。结果表明,淤堵效应明显减缓了沉降速率,也严重降低了疏浚淤泥的最终沉降量。

关键词: 真空预压, 真空度衰减, 固结, 淤堵, 沉降

Abstract: The dredged slurry has high water content and very low strength. It is generally considered that there will be no smear effect when the PVD is inserted. However, the dense "soil column" will be formed rapidly around the PVD under the vacuum pressure, which will greatly reduce the drainage capacity and fail to consolidate, i.e. clogging. The clogging effect of vacuum preloading on the dredged slurry is studied through laboratory tests. Based on the drainage volume and rate with consolidation time in the test, the formation time and the range of clogging zone are determined by the spatial and temporal distribution of the water content and permeability coefficient of soils. A vacuum transfer mode considering the clogging effect and the time effect is proposed. At the same time, considering the nonlinear relationship between the compressibility and the permeability of soils, an analysis model for analyzing the consolidation considering the clogging effect is established and the corresponding analytical solutions are obtained. The validity of the analytical solution is verified by comparing with the existing data and field test results. The influence of vacuum transfer mode, λ and c on the final settlement is analyzed by using the analytical solution in this work. The results show that the clogging effect obviously slows down the settlement rate and greatly reduces the final settlement of dredged slurry.

Key words: vacuum preloading, attenuation of vacuum pressure, consolidation, clogging, settlement

中图分类号: 

  • U 616
[1] 江文豪, 詹良通. 考虑井阻效应及径向渗透系数变化下砂井 地基的大变形固结[J]. 岩土力学, 2021, 42(3): 755-766.
[2] 胡利文, 刘志军, . 真空预压加固土体变形机制分析[J]. 岩土力学, 2021, 42(3): 790-799.
[3] 鲁泰山, 刘松玉, 蔡国军, 吴恺, 夏文俊, . 软土地层基坑开挖扰动及土体再压缩变形研究[J]. 岩土力学, 2021, 42(2): 565-573.
[4] 叶梓, 艾智勇, . 变荷载下层状非饱和土地基全耦合固结特性研究[J]. 岩土力学, 2021, 42(1): 135-142.
[5] 戴轩, 郭旺, 程雪松, 霍海峰, 刘国光, . 盾构隧道平行侧穿诱发的建筑纵向沉降 实测与模拟分析[J]. 岩土力学, 2021, 42(1): 233-244.
[6] 陈盛原, 叶华洋, 张伟锋, 韦未, . 路堤荷载作用下柔性桩复合地基的沉降分析[J]. 岩土力学, 2020, 41(9): 3077-3086.
[7] 侯公羽, 李子祥, 胡涛, 周天赐, 肖海林, 王凯迪, 胡锦欣, 朱景, . 基于分布式光纤应变传感技术的隧道 沉降监测研究[J]. 岩土力学, 2020, 41(9): 3148-3158.
[8] 胡安峰, 周禹杉, 陈缘, 夏长青, 谢康和, . 结构性土一维非线性大应变固结半解析解[J]. 岩土力学, 2020, 41(8): 2583-2591.
[9] 万志辉, 戴国亮, 高鲁超, 龚维明, . 大直径后压浆灌注桩承载力和沉降的 实用计算方法研究[J]. 岩土力学, 2020, 41(8): 2746-2755.
[10] 庄心善, 赵汉文, 王俊翔, 黄勇杰, 胡智. 循环荷载下重塑弱膨胀土滞回曲线 形态特征定量研究[J]. 岩土力学, 2020, 41(6): 1845-1854.
[11] 孙德安, 薛垚, 汪磊, . 变荷载作用下考虑半透水边界热传导性的 一维饱和土热固结特性研究[J]. 岩土力学, 2020, 41(5): 1465-1473.
[12] 蒲诃夫, 潘友富, KHOTEJA Dibangar, 周洋. 絮凝-水平真空两段式脱水法处理高 含水率疏浚淤泥模型试验研究[J]. 岩土力学, 2020, 41(5): 1502-1509.
[13] 李红坡, 梅国雄, 肖涛, 陈征. 涂抹区重叠竖井地基固结特性研究[J]. 岩土力学, 2020, 41(5): 1560-1566.
[14] 江留慧, 李传勋, 杨怡青, 张锐. 变荷载下双层地基一维非线性固结近似解析解[J]. 岩土力学, 2020, 41(5): 1583-1590.
[15] 陈琼, 崔德山, 王菁莪, 刘清秉. 不同固结状态下黄土坡滑坡滑 带土的蠕变试验研究[J]. 岩土力学, 2020, 41(5): 1635-1642.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
[1] 张力霆,齐清兰,魏静,霍倩,周国斌. 淤填黏土固结过程中孔隙比的变化规律[J]. , 2009, 30(10): 2935 -2939 .
[2] 张其一. 复合加载模式下地基失效机制研究[J]. , 2009, 30(10): 2940 -2944 .
[3] 陶干强,杨仕教,任凤玉. 崩落矿岩散粒体流动性能试验研究[J]. , 2009, 30(10): 2950 -2954 .
[4] 张明义,刘俊伟,于秀霞. 饱和软黏土地基静压管桩承载力时间效应试验研究[J]. , 2009, 30(10): 3005 -3008 .
[5] 吴 亮,钟冬望,卢文波. 空气间隔装药爆炸冲击荷载作用下混凝土损伤分析[J]. , 2009, 30(10): 3109 -3114 .
[6] 朱泽奇,盛 谦,梅松华,张占荣. 改进的遍布节理模型及其在层状岩体地下工程中的应用[J]. , 2009, 30(10): 3115 -3121 .
[7] 徐远杰,潘家军,刘祖德. 混凝土面板堆石坝的一种坝坡修整算法[J]. , 2009, 30(10): 3139 -3144 .
[8] 周晓杰,介玉新,李广信1. 基于渗流和管流耦合的管涌数值模拟[J]. , 2009, 30(10): 3154 -3158 .
[9] 吴昌瑜,张 伟,李思慎,朱国胜. 减压井机械淤堵机制与防治方法试验研究[J]. , 2009, 30(10): 3181 -3187 .
[10] 崔皓东,朱岳明. 二滩高拱坝坝基渗流场的反演分析[J]. , 2009, 30(10): 3194 -3199 .