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浙江大学学报(工学版)
浙江大学学报(工学版)  2024, Vol. 58 Issue (2): 413-425    DOI: 10.3785/j.issn.1008-973X.2024.02.019
交通工程、土木工程     
基于改进修正动员强度设计方法的软土基坑围护结构侧移预测
肖衎1(),张世民1,2,丁智2,3,*(),范晓真2,3,张霄1
1. 浙江大学 建筑工程学院，浙江 杭州 310058
2. 浙大城市学院 土木工程系，浙江 杭州 310015
3. 浙江省城市盾构隧道安全建造与智能养护重点实验室，浙江 杭州 310015
Prediction of lateral displacement of retaining structure of soft soil foundation pit based on improved modified mobilizable strength design method
Kan XIAO1(),Shimin ZHANG1,2,Zhi DING2,3,*(),Xiaozhen FAN2,3,Xiao ZHANG1
1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
2. Department of Civil Engineering, Hangzhou City University, Hangzhou 310015, China
3. Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province, Hangzhou 310015, China
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摘要：

为了进一步优化软土地区基坑设计方法，提升基坑支护体系的安全性与经济性，在已有研究的基础上，根据工程实践经验，修正了MSD法和其改进方法(MMSD法). 基于圆弧滑动模式提出更符合实际的塑性变形机制，引入基坑开挖主要影响深度来量化位移场尺寸. 理论计算方法适用于分析软黏土地区多支点式柔性支护结构的基坑开挖全过程的变形预测. 将该方法的计算结果与6个上海地区的基坑工程实测数据、弹性支点法的计算结果及MMSD法的计算结果进行对比分析. 对不同开挖阶段的围护结构最大侧移和最大侧移深度进行参数分析. 结果表明，利用该方法得到的预测值与实测值吻合效果更佳，预测精度高于弹性支点法和MMSD法，证明了该方法的实用性.
关键词： 能量法;  增量法;  墙体侧移;  软黏土;  多支撑开挖    
Abstract:

The MSD method and its improved method (MMSD method) were modified based on the existing research and the engineering practice experience in order to further optimize the design method of foundation pit in soft soil area and improve the safety and economy of foundation pit support system. A more realistic plastic deformation mechanism was proposed based on the circular sliding mode, and the main influence depth of foundation pit excavation was introduced to quantify the size of displacement field. The method is suitable for analyzing the deformation prediction of the whole process of foundation pit excavation of multi-fulcrum flexible supporting structure in soft clay area. The calculation results of the method were compared with the measured data of six foundation pit projects in Shanghai, the calculation results of elastic fulcrum method and the calculation results of MMSD method. The parameter analysis of the maximum lateral displacement and the maximum lateral displacement depth of the retaining structure in different excavation stages was conducted. Results showed that the predicted value of the method accorded with the measured value, and the prediction accuracy was higher than that of the elastic fulcrum method and MMSD method. The practicability of this method was proved.
Key words: energy method    incremental method    wall deflection    soft clay    multi-support excavation
收稿日期: 2023-07-01 出版日期: 2024-01-23
CLC:  TU 47  
基金资助: 浙江省“尖兵”“领雁”研发攻关计划资助项目(2023C03182)；国家自然科学基金资助项目(52178400，52278418)；浙江省自然科学基金资助项目(LHZ20E080001，LQ23E080002)；浙江省重点研发计划资助项目(2020C01102).
通讯作者: 丁智     E-mail: 22112197@zju.edu.cn;dingz@zucc.edu.cn
作者简介: 肖衎（1999— ），男，硕士生，从事岩土工程的研究. orcid.org/0009-0001-4347-7648. E-mail：22112197@zju.edu.cn
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引用本文:

肖衎,张世民,丁智,范晓真,张霄. 基于改进修正动员强度设计方法的软土基坑围护结构侧移预测[J]. 浙江大学学报(工学版), 2024, 58(2): 413-425.

Kan XIAO,Shimin ZHANG,Zhi DING,Xiaozhen FAN,Xiao ZHANG. Prediction of lateral displacement of retaining structure of soft soil foundation pit based on improved modified mobilizable strength design method. Journal of ZheJiang University (Engineering Science), 2024, 58(2): 413-425.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2024.02.019    或    https://www.zjujournals.com/eng/CN/Y2024/V58/I2/413

图 1  悬臂塑性变形机制
图 2  MMSD法中的基坑塑性变形机制(宽基坑)
图 3  MMSD法中的基坑塑性变形机制(窄基坑)
图 4  Terzaghi破坏机制
图 5  MMSD法中重叠的位移场
图 6  圆弧滑动破坏机制
图 7  改进后的基坑塑性变形机制
图 8  可能的沉降影响区和破坏模式
图 9  基于主动破坏模式的主要影响区
图 10  改进后重叠的位移场
图 11  土体动员抗剪强度分区
基坑Tw/mmEI/(kN·m?2)Hw/mHe/mLp/mB/mHi/m
西藏南路8001 280 00038.020.6169.022.81.56.510.814.417.5
浦东南路600540 00027.017.3196.020.80.64.27.811.414.5
浦电路600540 00026.516.5194.020.41.04.27.211.114.2
古北路8001 280 00026.014.5149.517.50.43.97.410.9—
兴业大厦8001 280 00031.2512.480800.13.97.110.4—
上海南站8001 280 00027.510.954001003.08.5———
表 1  各基坑设计参数的汇总
图 12  上海K0固结软土试样的归一化应力应变关系[18]
图 13  改进MMSD法的计算流程
图 14  窄基坑计算值与实测值的对比
图 15  宽基坑计算值与实测值的对比
图 16  最大侧移的预测准确性
图 17  最大侧移深度的预测准确性
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