Stability analysis of cofferdam built with dredged saturated silty clay with soft clay dumped by boats

JIANG Ping; YANG Hang; ZHU Bitang; HUANG Jiangyu; WANG Hao; HUANG Yong; LIU Sihao

doi:10.11835/j.issn.2096-6717.2021.252

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Stability analysis of cofferdam built with dredged saturated silty clay with soft clay dumped by boats

Civil Engineering | 更新时间：2022-11-07

- Stability analysis of cofferdam built with dredged saturated silty clay with soft clay dumped by boats
- Journal of Civil and Environmental Engineering Vol. 44, Issue 6, Pages: 22-32(2022)
- 作者机构：
  
  1.江西省港航建设投资集团港航运输有限公司，南昌 330008
  2.华东交通大学，土木建筑学院，南昌 330013
  2.华东交通大学，江西省地下空间技术开发工程研究中心，南昌 330013
  4.南昌龙行港口集团有限公司，南昌 330029
  5.江西交远物流有限公司，南昌 330029
  6.江西省路港工程有限公司，南昌 330029
  7.江西省航道工程局，南昌 330000
- 作者简介：
  
  brief:JIANG Ping (1979- ), senior engineer, main research interests: highway and bridge engineering, E-mail: 46559239@qq.com.
  ZHU Bitang （corresponding author）， professor， doctorial supervisor， E-mail： btangzh@hotmail.com.
- 基金信息：
  
  Jiangxi Provincial Department of Transport Key Engineering Science and Technology Projects(2019C0010;2019C0011);Key Laboratory of Geotechnical Engineering Infrastructure Safety and Control in Jiangxi Province Funded Project(20161BCD40010)
- DOI：10.11835/j.issn.2096-6717.2021.252
  CLC： TV641.2
- Received：28 July 2021，
  
  Published：30 December 2022
- 稿件说明：
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江平,杨航,朱碧堂等.抛填饱和粉质黏土夹淤泥质土围堰稳定性分析[J].土木与环境工程学报,2022,44(06):22-32.

JIANG Ping,YANG Hang,ZHU Bitang,et al.Stability analysis of cofferdam built with dredged saturated silty clay with soft clay dumped by boats[J].Journal of Civil and Environmental Engineering,2022,44(06):22-32.
江平,杨航,朱碧堂等.抛填饱和粉质黏土夹淤泥质土围堰稳定性分析[J].土木与环境工程学报,2022,44(06):22-32. DOI： 10.11835/j.issn.2096-6717.2021.252.

JIANG Ping,YANG Hang,ZHU Bitang,et al.Stability analysis of cofferdam built with dredged saturated silty clay with soft clay dumped by boats[J].Journal of Civil and Environmental Engineering,2022,44(06):22-32. DOI： 10.11835/j.issn.2096-6717.2021.252.

摘要

江西信江双港航运枢纽采用导流明渠开挖的饱和粉质黏土夹淤泥质土进行围堰填筑，施工过程中，水下围堰由明渠浚挖土直接采用挖泥船进行水上抛填，饱和粉质黏土受浚挖和抛填双重扰动，强度低且堰体内分布极不均匀，不仅围堰难于成型，且运行期内易发生堰坡失稳。为了评估这类围堰堰坡的稳定性、探究水位涨落条件下抛填饱和粉质黏土围堰边坡的变形破坏模式，采用有限元软件PLAXIS对信江双港航运枢纽上下游围堰开展不同水位及不同水位升降速率条件下的稳定性计算分析；针对抛填形成的围堰土体强度变化范围大、受环境影响明显的特性，开展堰坡稳定性的敏感性分析，同时，基于安全系数接近于1.0时的坡体最大侧向变形随时间的变化曲线，提出堰体稳定自动监控的预警和报警值。结果表明：采用坡度为1：4~1：5的平缓围堰边坡，通过设置反压平台，围堰在正常水位涨落条件下处于稳定状态；抛填土的强度降低会诱发滑动体从背水面坡脚贯通到堰顶；由于抛填饱和粉质黏土围堰的强度低和不均质性，为确保围堰稳定，须进行侧向变形、渗压及降雨量监测实时监控预警；抛填饱和粉质黏土围堰侧向变形报警值和预警值宜取1.5~2.0、1.1~1.5 mm/d。

Abstract

Jiangxi Shuanggang Shipping & Navigation Project attempted to use the saturated silty clay with soft clay dredged from the open diversion channel to build the cofferdam. During construction

the dredged saturated silty clay was dumped by boats above the water

resulting in disturbed and non-homogenous silty clay with soft clay. This results in the difficulties to form the cofferdam with the desired gradients and failure of the cofferdam during operation. To assess the cofferdam stability during construction and operation with water level fluctuations

extensive numerical modelling using the finite element program PLAXIS was carried out. Further considering the non-uniformity of the dumped saturated silty clay and the variation of its strength with rainfall and evaporation

sensitivity analyses on the soil strength parameters were carried out. Based on the maximum lateral deformation curve of the cofferdam with the factor of safety close to 1.0

the yellow and red alarm levels were proposed for the remote real-time monitoring. The results indicate: the cofferdam with a slope of 1:4-1:5 and berms is stable at normal water levels; the reduction in strength of the dumped soil would induce instability of the downstream cofferdam slope from the toe to the top; due to the non-uniformity and low strength of the dumped saturated silty clay

remote real-time monitoring shall be carried out on the cofferdam lateral deformation

seepage pressure

and rainfall; based on the deformation curve with the factor of safety

the red and yellow alarm levels are 1.5-2.0 mm/d and 1.1-1.5 mm/d respectively.

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references

张嵩云 , 毛卉 . 洪水过程的菲律宾Kauswagan电站围堤渗流及边坡稳定分析 [J]. 水运工程 , 2020 ( 5 ): 55 - 60 .

ZHANG S Y , MAO H . Dike seepage and slope stability analysis of Philippines’s Kauswagan Power Plant in flood process [J]. Port & Waterway Engineering , 2020 ( 5 ): 55 - 60 . (in Chinese)

DALMORA C T , OTA J J . Study of the flow around cofferdams constructed in running water through computational model [J]. RBRH , 2018 , 23 .

刘明洋 . 超标洪水对上游土石围堰产生漫顶溃决的过程研究 [D]. 湖北宜昌 : 三峡大学 , 2018 .

LIU M Y . Research on the process of the upstream earthrock cofferdam break by overtopping [D]. Yichang, Hubei : Three Gorges University , 2018 . (in Chinese)

陈凌伟 . 软基上大砂袋围堰的变形与失稳模式研究 [D]. 广州 : 华南理工大学 , 2016 .

CHEN L W . Deformation and failure mode of the large-scale geotextile sand container cofferdam on soft foundation [D]. Guangzhou : South China University of Technology , 2016 . (in Chinese)

张超 . 高土石不过水围堰边坡失稳风险分析 [J]. 岩石力学与工程学报 , 2015 , 34 ( Sup2 ): 4157 - 4163 .

ZHANG C . Risk analysis of slope instability of high earth no-overflow-cofferdam [J]. Chinese Journal of Rock Mechanics and Engineering , 2015 , 34 ( Sup2 ): 4157 - 4163 . (in Chinese)

罗立哲 , 胡志根 , 刘全 , 等 . 高土石围堰施工—运行过程边坡稳定性分析 [J]. 武汉大学学报(工学版) , 2013 , 46 ( 1 ): 84 - 88 .

LUO L Z , HU Z G , LIU Q , et al . Slope stability analysis of high earth-rock cofferdam considering construction and working processing [J]. Engineering Journal of Wuhan University , 2013 , 46 ( 1 ): 84 - 88 . (in Chinese)

XU J B , LI H , DU K , et al . Field investigation of force and displacement within a strata slope using a real-time remote monitoring system [J]. Environmental Earth Sciences , 2018 , 77 ( 15 ): 1 - 11 .

赵烨锋 . 自动化监测系统在水电站库区滑坡监测中的研究与应用 [D]. 北京 : 中国地质大学(北京) , 2018 .

ZHAO Y F . Research and application of automatic monitoring system in landslide monitoring in reservoir area of water power station [D]. Beijing : China University of Geosciences , 2018 . (in Chinese)

吴梦喜 , 宋世雄 , 吴文洪 . 拉哇水电站上游围堰渗流与应力变形动态耦合仿真分析 [J]. 岩土工程学报 , 2021 , 43 ( 4 ): 613 - 623 .

WU M X , SONG S X , WU W H . Dynamic coupled simulation analysis of seepage and stress deformation of upstream cofferdam of Lava Hydropower Station [J]. Chinese Journal of Geotechnical Engineering , 2021 , 43 ( 4 ): 613 - 623 . (in Chinese)

MADANAYAKA T A , SIVAKUGAN N . Adaptation of method of fragments to axisymmetric cofferdam seepage problem [J]. International Journal of Geomechanics , 2017 , 17 ( 9 ): 06017012 .

王克忠 , 金志豪 , 杨麦珍 , 等 . 取水塔基坑开挖过程倒悬岩坎围堰渗透稳定性研究 [J]. 岩土力学 , 2018 , 39 ( 增刊2 ): 415 - 422 .

WANG K Z , JIN Z H , YANG M Z , et al . Permeability stability study of overhang rock cofferdam during excavating foundation pit of water intake tower [J]. Rock and Soil Mechanics , 2018 , 39 ( Sup2 ): 415 - 422 . (in Chinese)

DENG Y , HE C H , FU S J , et al . Finite element analysis on earth-rock cofferdam behavior during pumping and drainage of foundation pit [J]. IOP Conference Series: Earth and Environmental Science , 2019 , 376 : 012022 .

SULOVSKA M , STACHO J , KOPECKY M . The stability analysis of a cofferdam using the numerical modelling [J]. IOP Conference Series: Materials Science and Engineering , 2020 , 960 : 022068 .

董存军 . 考虑渗流效应的大型土石围堰稳定性研究 [D]. 重庆 : 重庆大学 , 2012 .

DONG C J . Research on stability of large earth-rock cofferdam under the seepage effection [D]. Chongqing : Chongqing University , 2012 . (in Chinese)

水利水电工程围堰设计规范 : SL 645—2013 [S]. 北京 : 中国水利水电出版社 , 2013 .

Design code for cofferdam of water resources and hydropower engineering : SL 645-2013 [S]. Beijing : China WaterPower Press , 2013 . (in Chinese))

叶琪 , 简文彬 , 张登 , 等 . 驳岸岸坡渗流及其稳定性有限元分析 [J]. 水利与建筑工程学报 , 2013 , 11 ( 4 ): 38 - 42 .

YE Q , JIAN W B , ZHANG D , et al . Finite element analysis on seepage and stability of revetment bank slope [J]. Journal of Water Resources and Architectural Engineering , 2013 , 11 ( 4 ): 38 - 42 . (in Chinese)

张珂峰 . 库水位骤降联合降雨边坡稳定敏感性分析 [J]. 三峡大学学报(自然科学版) , 2019 , 41 ( 6 ): 17 - 20 .

ZHANG K F . Sensitivity analysis of slope stability with combined rainfall and sudden drop of reservoir water level [J]. Journal of China Three Gorges University (Natural Sciences) , 2019 , 41 ( 6 ): 17 - 20 . (in Chinese)

贺新星 , 王瑞骏 , 闫菲 . 厚层淤泥质地基高土石围堰边坡抗滑稳定敏感性分析 [J]. 水资源与水工程学报 , 2016 , 27 ( 6 ): 196 - 201 .

HE X X , WANG R J , YAN F . Analysis of slope stability sensitivity of high earth-rock cofferdam on the thick silt foundation [J]. Journal of Water Resources and Water Engineering , 2016 , 27 ( 6 ): 196 - 201 . (in Chinese)

王睿星 , 王瑞骏 , 赵叶 . 深覆盖层上高土石围堰渗流场的敏感性分析 [J]. 水资源与水工程学报 , 2017 , 28 ( 6 ): 215 - 218, 225 .

WANG R X , WANG R J , ZHAO Y . Sensitivity analysis of seepage field of high earth-rock cofferdam in deep overburden [J]. Journal of Water Resources and Water Engineering , 2017 , 28 ( 6 ): 215 - 218, 225 . (in Chinese)

刘汉东 , 王四巍 . 小浪底水利枢纽东苗家滑坡预警系统研究 [J]. 水力发电学报 , 2017 , 36 ( 9 ): 1 - 9 .

LIU H D , WANG S W . Early warning system of Dongmiaojia landslide body in Xiaolangdi water control project [J]. Journal of Hydroelectric Engineering , 2017 , 36 ( 9 ): 1 - 9 . (in Chinese)

陈明杰 , 桑登峰 , 娄学谦 . 素咬合止水桩土石围堰监测及变形分析 [J]. 水运工程 , 2020 ( 8 ): 195 - 201 .

CHEN M J , SANG D F , LOU X Q . Monitoring and analysis of deformation for earth-rock cofferdam with pure concrete linked water cut-off pile [J]. Port & Waterway Engineering , 2020 ( 8 ): 195 - 201 . (in Chinese)

CUI H B , LIU B X , ZHANG C L , et al . Discussion on deformation monitoring method of asphalt concrete core wall of high earth-rock dam [J]. IOP Conference Series: Earth and Environmental Science , 2020 , 525 : 012163 .

伍琪琳 , 焦淑贤 . 基于监测系统的某干施工围堰渗漏的发现及处理 [J]. 水运工程 , 2018 ( 10 ): 189 - 193, 206 .

WU Q L , JIAO S X . Detection and treatment for leakage of a dry-construction cofferdam based on monitoring system [J]. Port & Waterway Engineering , 2018 ( 10 ): 189 - 193, 206 . (in Chinese)

任杰 , 苏怀智 , 杨孟 , 等 . 边坡位移预警指标的实时估计与诊断 [J]. 水利水运工程学报 , 2016 ( 1 ): 30 - 36 .

REN J , SU H Z , YANG M , et al . Real-time estimation and diagnosis of early warning indicator of slope displacement based on POT-catastrophe theory [J]. Hydro-Science and Engineering , 2016 ( 1 ): 30 - 36 . (in Chinese)

JU N P , HUANG J , HE C Y , et al . Landslide early warning, case studies from Southwest China [J]. Engineering Geology , 2020 , 279 : 105917 .

建筑基坑工程监测技术标准 : GB 50497—2019 [S]. 北京 : 中国计划出版社 , 2019 .

Technical standards for building foundation pit engineering monitoring : GB 50497-2019 [S]. Beijing : China Planning Press , 2019 . (in Chinese)

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