岩土力学 ›› 2023, Vol. 44 ›› Issue (S1): 27-49.doi: 10.16285/j.rsm.2022.0030

• 基础理论与实验研究 • 上一篇    下一篇

降雨影响下基坑开挖施工对邻近基桩变形响应分析

张治国1, 2, 3，毛敏东1，王卫东4，PAN Y T2，吴钟腾3   

  1. 1. 上海理工大学 环境与建筑学院，上海 200093；2. 新加坡国立大学 土木环境工程系，新加坡 119077； 3. 自然资源部丘陵山地地质灾害防治重点实验室 福建省地质灾害重点实验室，福建 福州 350002； 4. 华东建筑设计研究院有限公司 上海地下空间与工程设计研究院，上海 200002
  • 收稿日期:2022-01-05 接受日期:2022-03-25 出版日期:2023-11-16 发布日期:2023-11-16
  • 作者简介:张治国，男，1978年生，博士后，教授，主要从事地下工程施工环境影响等方面的教学与研究工作。
  • 基金资助:
    国家自然科学基金资助项目（No. 41977247，No. 42177145）；自然资源部丘陵山地地质灾害防治重点实验室（福建省地质灾害重点实验室）课题（No. FJKLGH2020K004）。

Deformation response of adjacent pile induced by foundation pit excavation under the influence of rainfall

ZHANG Zhi-guo1, 2, 3, MAO Min-dong1, WANG Wei-dong4, PAN Y T2, WU Zhong-teng3   

  1. 1. School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China; 2. Department of Civil and Environmental Engineering, National University of Singapore, Singapore 119077; 3. Fujian Key Laboratory of Geohazard Prevention, Key Laboratory of Geohazard Prevention of Hilly Mountains, Ministry of Natural Resources, Fuzhou, Fujian 350002, China; 4. Underground Space Engineering Design & Research Institute, East China Architecture Design & Research Institute, Shanghai 200002, China
  • Received:2022-01-05 Accepted:2022-03-25 Online:2023-11-16 Published:2023-11-16
  • Supported by:
    This work was supported by Supported by the National Natural Science Foundation of China (41977247, 42177145) and the Opening Fund of Key Laboratory of Geohazard Prevention of Hilly Mountains, Ministry of Natural Resources (Fujian Key Laboratory of Geohazard Prevention) (FJKLGH2020K004).

PDF (Chinese)

160

摘要：

目前关于基坑开挖对邻近基桩变形响应的简化理论解研究，还较少考虑基坑开挖中支护作用的影响，尤其是没有考虑降雨环境带来的土工影响。基于一种适用于不同降雨工况的分层假定Green-Ampt模型来模拟降雨入渗过程，采用两阶段分析方法，研究了降雨影响下基坑开挖与邻近基桩相互作用的问题。首先，考虑基坑开挖土体卸荷、围护结构及支撑结构的影响，采用Mindlin基本解，分析降雨影响下基坑开挖施工导致邻近基桩位置的土体附加应力；然后，基于Pasternak双参数地基模型，探讨基桩与土体之间的相互作用，求得降雨影响下单桩和群桩随降雨历时变化的水平变形响应。通过工程监测数据与理论计算结果进行对比，获得了较好的一致性。此外，也针对降雨敏感参数（降雨强度、饱和渗透系数、初始含水率、基质吸力）与基桩敏感参数（边界条件、支撑刚度、桩径、开挖深度、桩与基坑间距）进行了影响因素分析。分析结果表明，所提出的理论方法可较好地反映降雨影响下基坑开挖施工对邻近基桩的变形响应；降雨对邻近基桩变形影响显著，降雨参数敏感程度依次为：降雨强度>初始含水率>饱和渗透系数>基质吸力；随着降雨历时的增长，湿润层发展深度不断增大，其发展速率呈现出逐渐衰弱并趋近于土体饱和渗透系数的规律，基坑开挖引起的邻近基桩位移也随之越来越大，其顶部位移变化速率逐渐减小后收敛至某一特定值；支撑刚度和基桩与基坑距离越小，基桩受到降雨历时的影响程度就越大；不同桩径的基桩受到降雨历时的影响程度基本相同；开挖深度越大，基桩受到降雨历时的影响程度就越大。

关键词: 降雨, Green-Ampt模型, 基坑开挖, 支撑刚度, 基桩变形响应, Pasternak地基模型

Abstract: Currently, the simplified analysis for the deformation response of adjacent piles by excavation has seldom considered the influence of supporting action, especially the geotechnical influence caused by the rainfall environment. Based on the stratified hypothetical Green-Ampt model applicable to different rainfall conditions to simulate the rainfall infiltration process, a two-stage method was proposed to analyze the interaction between the excavation and the adjacent pile under the influence of rainfall. In the first stage, considering the influence of soil unloading, retaining, and supporting of excavation, the Mindlin solution was used to analyze the additional stresses in the soil at the adjacent pile foundations caused by the excavation of the foundation pit under the rainfall. In the second stage, based on the Pasternak foundation model, the interaction between pile foundations and soil was explored to obtain the horizontal deformation response of single piles and groups of piles under the influence of rainfall with the rainfall duration. The monitoring data from existing engineering were compared to the theoretical calculation results with good agreements. In addition, the parameters of rainfall (rainfall intensity, saturated permeability coefficient, initial water content, matric suction) and pile (boundary conditions, brace stiffness, pile diameter, excavation depth, distance between piles and foundation pit) were analyzed to investigate the influences on pile deformation. The results show that the proposed theoretical method can better reflect the deformation response of foundation excavation on adjacent pile foundations under the rainfall. The rainfall has a significant influence on the deformation of the adjacent pile, and the sensitivity of rainfall parameters is as follows: rainfall intensity > initial water content > saturated permeability coefficient > matric suction. With the increase of the rainfall duration, the development depth of the wet front continues to increase, and its development rate shows a gradual weakening law until it approaches the saturated permeability coefficient. The displacement of adjacent piles caused by the excavation becomes larger and larger, and the change rate of the top displacement first gradually decreases and then converges to a specific value. The smaller the support stiffness and pile-excavation distance, the greater the influence of rainfall duration on piles. The influence of rainfall duration on piles with different pile diameters is basically the same. The greater the excavation depth, the greater the influence of rainfall duration on piles.

Key words: rainfall, Green-Ampt model, foundation pit excavation, brace stiffness, response of pile deformation, Pasternak foundation model

中图分类号: 

  • TU 470
[1] 冯海洲, 蒋关鲁, 何梓雷, 郭玉丰, 胡金山, 李杰, 袁胜洋, . 预应力锚索桩板墙加固隧道洞口边坡的动力响应特性研究[J]. 岩土力学, 2023, 44(S1): 50-62.
[2] 王斌, 李洁涛, 王佳俊, 陈鹏林, . 强降雨诱发堆积体滑坡模型试验研究[J]. 岩土力学, 2023, 44(S1): 234-248.
[3] 张坤勇, 张梦, 孙斌, 李福东, 简永洲, . 考虑时空效应的软土狭长型深基坑地连墙变形计算方法[J]. 岩土力学, 2023, 44(8): 2389-2399.
[4] 张治国, 毛敏东, 朱正国, 赵其华, 吴钟腾, . 间歇性强降雨诱发滑坡对抗滑桩非线性力学响应分析[J]. 岩土力学, 2023, 44(7): 2073-2094.
[5] 王旭, 董梅, 孔梦悦, 邓云鹏, 徐日庆, 龚晓南, . 基于扩散波近似方程的降雨边界处理的改进[J]. 岩土力学, 2023, 44(6): 1761-1770.
[6] 王力, 南芳芸, 王世梅, 陈勇, 李小伟, 范志宏, 陈玙珊, . 三峡库区降雨型滑坡入渗特征及变形机制——基于一维和二维模型试验研究[J]. 岩土力学, 2023, 44(5): 1363-1374.
[7] 张明礼, 雷兵兵, 周志雄, 周凤玺, 侯彦东, . 考虑雨水感热的降雨对多年冻土水热变化影响模型研究[J]. 岩土力学, 2023, 44(5): 1530-1544.
[8] 王锐松, 郭成超, 林沛元, 王复明, . 富水粉土基坑装配式可回收支护开挖响应分析[J]. 岩土力学, 2023, 44(3): 843-853.
[9] 周翔, 蔡静森, 马伟成, 肖皓文, . 物质组成特征对碎石土斜坡变形破坏影响研究[J]. 岩土力学, 2023, 44(2): 531-540.
[10] 应宏伟, 熊一帆, 沈华伟, 魏锋, 李冰河, 吕唯, . 考虑圆孔不均匀收敛和空间效应的基坑坑外土体水平位移场分析[J]. 岩土力学, 2023, 44(12): 3565-3576.
[11] 张治国, 罗杰, 朱正国, PAN Y T, 孙苗苗, . 强降雨影响下盾构隧道开挖面稳定性的三维对数螺旋模型上限解[J]. 岩土力学, 2023, 44(12): 3587-3601.
[12] 管凌霄, 徐长节, 王雪鹏, 夏雪勤, 可文海, . 基坑开挖及降水引起下卧隧道变形的解析解[J]. 岩土力学, 2023, 44(11): 3241-3251.
[13] 白时雨, 王文军, 谢新宇, 朱德良, . 考虑扰动影响的土体小应变硬化模型参数试验研究及其在基坑工程中的应用[J]. 岩土力学, 2023, 44(1): 206-216.
[14] 韩佳明, 董照, 苏三庆, 马鑫, 李冠兵, . 均质非饱和边坡降雨入渗解析解及在黄土边坡的应用[J]. 岩土力学, 2023, 44(1): 241-250.
[15] 刘斯宏, 沈超敏, 程德虎, 张呈斌, 毛航宇, . 土工袋加固膨胀土边坡降雨−日晒循环试验研究[J]. 岩土力学, 2022, 43(S2): 35-42.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
[1] 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 .
[2] 张家兰，文海家，李百战. 某天然气储配站场地边坡处治可靠性评价[J]. , 2009, 30(S2): 414 -417 .
[3] 周志军 ，陈昌富. 路堤下土工合成材料加固软土地基的极限分析[J]. , 2011, 32(10): 3014 -3018 .
[4] 明华军，冯夏庭，陈炳瑞，张传庆. 基于矩张量的深埋隧洞岩爆机制分析[J]. , 2013, 34(1): 163 -172 .
[5] 徐栋栋，孙冠华，郑 宏. 接触处理Munjiza方法在数值流形法中的应用[J]. , 2013, 34(2): 526 -534 .
[6] 郑惠峰，汪卫明，陈胜宏. 弹粘塑性块体单元法在龙滩水电站右坝肩边坡稳定分析中的应用[J]. , 2006, 27(1): 107 -111 .
[7] 吴振君，邓建辉，闵 弘. 基于GIS的滑坡监测信息管理与分析系统[J]. , 2004, 25(11): 1739 -1743 .
[8] 严成增，郑 宏，孙冠华，葛修润. 基于OpenMP的二维有限元-离散元并行分析方法[J]. , 2014, 35(9): 2717 -2724 .
[9] 沈 蓉，张 辉，李 琦，关学伟，李仕胜，廖建军 . 小湾水电站坝址区岩体抗剪强度试验研究[J]. , 2006, 27(S2): 701 -704 .
[10] 蒋明镜 ，张 宁 ，金树楼 , . 不同胶结宽度粒间胶结特性试验研究[J]. , 2015, 36(4): 928 -936 .
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, 87199252, 87199253, 87198752　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