降水开挖共同作用下地连墙受力变形机制模型试验研究

迟民良; 梁禄钜; 徐长节; 杨开放; 丁智

doi:10.11779/CJGE20230889

降水开挖共同作用下地连墙受力变形机制模型试验研究 English Version

迟民良^1,,
梁禄钜^{1, 2},
徐长节^{1, 3},
杨开放^{1, 2, ,},
丁智^{1, 2}

1.
浙江大学滨海和城市岩土工程研究中心, 浙江杭州 310058
2.
浙大城市学院工程学院, 浙江杭州 310015
3.
华东交通大学江西省岩土工程基础设施安全与控制重点实验室, 江西南昌 330013

基金项目:

国家自然科学基金项目 52238009

国家自然科学基金-高铁联合基金项目 U1934208

江西省自然科学基金-揭榜挂帅项目 20223BBG71018

详细信息

作者简介:
迟民良(1998—)，男，博士研究生，主要从事基坑开挖及降水等方面的科研工作。E-mail: mlchi@zju.edu.cn

通讯作者:
杨开放, E-mail: yangkf@zju.edu.cn

中图分类号: TU43
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出版历程
- 收稿日期: 2023-09-12
- 网络出版日期: 2024-06-04
- 刊出日期: 2025-01-31

Model tests on stress and deformation mechanism of diaphragm wall under combined effects of dewatering and excavation

CHI Minliang^1,,
LIANG Luju^{1, 2},
XU Changjie^{1, 3},
YANG Kaifang^{1, 2, ,},
DING Zhi^{1, 2}

1.
Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
2.
School of Engineering, Hangzhou City University, Hangzhou 310015, China
3.
Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering, East China Jiaotong University, Nanchang 330013, China

摘要

摘要: 为揭示基坑降水与开挖共同作用下地连墙受力变形机制，开展了室内模型试验模拟基坑干砂开挖与降水开挖过程，采集了地连墙两侧水土压力、坑外地表沉降、地连墙弯矩及侧移等数据。通过对比不同工况条件下地连墙受力变形的变化特点及内在联系，分析了基坑降水开挖对地连墙受力变形的影响机制。试验结果表明：基坑降水与基坑开挖均会改变地连墙两侧侧向土压力分布形式，与干砂开挖相比，降水开挖共同作用时侧向土压力变化更为显著，墙前被动土压力更小，墙后侧向土压力峰值位置则有所下移，地连墙由此产生更大的弯矩值，并诱发更显著的地连墙侧移。
- 降水 /
- 基坑开挖 /
- 模型试验 /
- 地连墙侧移 /
- 孔隙水压力 /
- 土压力
Abstract: In order to reveal the mechanism of stress and deformation of the diaphragm wall under combined effects of dewatering and excavation, the processes of dry sand excavation and excavation with dewatering are carefully simulated by conducting a series of laboratory model tests, and the data such as pore-water and earth pressures at both sides of the diaphragm wall, settlements outside the pit, bending moments and lateral displacements of the wall are collected. By comparing the characteristics of variations and internal connections of stress and deformation of the diaphragm wall under different conditions, the mechanism of stress and deformation of the diaphragm wall caused by excavation with dewatering is analyzed. The results show that the distribution patterns of lateral earth pressures at both sides of the diaphragm wall will be changed by both dewatering and excavation. The lateral earth pressures change more significantly under the combined effects of dewatering and excavation compared with the case of dry sand excavation, there will be less passive earth pressure zone in front of the diaphragm wall, while the peak positions of lateral earth pressures behind the diaphragm wall will move down. On this occasion, the diaphragm wall will develop greater bending moments and induce more significant lateral displacements.
- dewatering /
- excavation /
- model test /
- lateral displacement of diaphragm wall /
- pore-water pressure /
- earth pressure

HTML全文

图 1 基坑平面布置及模拟区

Figure 1. Plan view and simulated area of studied foundation pit

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图 2 模型试验装置实物图

Figure 2. Physical diagram of model test devices

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图 3 模型试验装置示意图

Figure 3. Diagram of model test devices

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图 4 试验土体颗粒级配曲线

Figure 4. Grain-size distribution curve of model soil

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图 5 试验土体固结试验结果

Figure 5. Consolidation test results of model soil

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图 6 模型试验归一化地表沉降与经验曲线对比

Figure 6. Comparison of normalized surface subsidences from model tests and experience curves

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图 7 地连墙侧向土压力计算简图

Figure 7. Calculation of lateral earth pressure of diaphragm wall

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图 8 干砂开挖侧向土压力沿深度分布

Figure 8. Distribution curves of lateral earth pressure over depth in dry sand excavation

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图 9 干砂开挖侧向土压力之差沿深度分布

Figure 9. Distribution curves of difference in lateral earth pressure over depth in dry sand excavation

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图 10 降水开挖侧向土压力变化沿深度分布

Figure 10. Distribution curves of lateral earth pressure over depth in excavation with dewatering

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图 11 降水开挖侧向土压力之差沿深度分布

Figure 11. Distribution curves of difference in lateral earth pressure over depth in excavation with dewatering

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图 12 降水开挖墙侧孔隙水压力沿深度分布

Figure 12. Distribution curves of pore water pressure over depth in excavation with dewatering

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图 13 降水开挖侧向孔隙水压力之差沿深度分布

Figure 13. Distribution curves of difference in pore water pressure over depth in excavation with dewatering

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图 14 侧向土压力变化值沿深度分布对比图

Figure 14. Comparative diagram of variation of lateral earth pressure over depth

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图 15 侧向土压力之差沿深度分布对比图

Figure 15. Comparative diagram of difference in lateral earth pressure over depth

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图 16 地连墙弯矩沿深度分布

Figure 16. Distribution curves of bending moment of diaphragm wall over depth

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图 17 地连墙侧移计算简图

Figure 17. Calculation of deflection of diaphragm wall

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图 18 地连墙侧移沿深度分布

Figure 18. Distribution curves of deflection of diaphragm wall over depth

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表 1 土性参数表

Table 1 Physical parameters of model soil

土层	${\rho _0}$ /(g·cm^-3)	${w_0}$ /%	${G_{\text{s}}}$	e	K/(m·d^-1)	$\varphi$ /(°)	$\varphi '$ /(°)	${E_{\text{s}}}$ /MPa
砂土	2.01	29.6	2.67	0.72	18.68	22.8	31.6	11.67

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表 2 模型试验工况

Table 2 Programmes of model tests

工况	开挖深度/cm	降水后水位/cm
Ⅰ降水开挖	10，20，30，40	-15，-21，-31，-41
Ⅱ干砂开挖	10，20，30，40	—
注：初始地下水位为-15 cm，每层开挖前，将坑内地下水位降至开挖深度以下1 cm处。

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