Soil movement mechanism associated with arching effect in a multi-strutted excavation in soft clay

Li Zhuofeng; Lin Weian; Ye Junneng; Chen Yunmin; Bian Xuecheng; Gao Fei

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Soil movement mechanism associated with arching effect in a multi-strutted excavation in soft clay

机译：在软粘土中多支承挖掘中的拱形效应与拱形效应相关的土壤运动机制

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Arching effect behind the wall in a multi-strutted excavation is a soil stress transfer process related to differences in stiffness between the well-braced soil and the underlying soil. This effect has been demonstrated by studies on soil stress transfer and lateral wall pressure in the literature. However, the soil movement mechanism associated with the arching effect is still unknown. In this study, a multi-strutted excavation in soft clay in Ningbo was closely monitored to determine the contours of the total soil movement and engineering shear strain, and these data were then used to produce a detailed interpretation of soil arching development and its influence on soil movement. It is found that plastic flow occurs behind the wall as soil arching develops to the ground surface, resulting in a large soil movement zone and a dramatic increase in ground surface settlement. The soil in the shear zone is also disturbed and verified by cone penetration tests. In addition, this study proposes that the ratio between soil volume loss due to ground surface settlement and soil volume gain due to wall deflection can be used to characterize soil arching development and its influence on soil movement. This study improves the understanding of the soil movement mechanism behind walls in multi-strutted excavations in soft clay, which is very important for protecting adjacent structures and facilities.

机译：在多支挖掘的墙壁后面的拱形效应是一种与井带状土壤和下层土壤之间刚度差异有关的土壤应激转移过程。通过关于文献中的土壤应力转移和横壁压力的研究证明了这种效果。然而，与拱形效果相关的土壤运动机制仍然未知。在这项研究中，宁波软粘土中的多支除挖掘被密切监测，以确定整个土壤运动和工程剪切应变的轮廓，然后使用这些数据来产生对土壤拱形发展的详细解释及其影响土壤运动。发现塑料流动发生在墙壁后面，因为土拱形成到地面，导致大型土壤运动区和地面沉降的剧烈增加。剪切区中的土壤也受到锥形渗透试验的干扰和验证。此外，本研究提出了由于壁偏转引起的地表沉降和土壤体积增益引起的土壤体积损失之间的比率可用于表征土拱开发及其对土壤运动的影响。该研究改善了软粘土中多支线挖掘中墙壁背后的土壤运动机制的理解，这对于保护邻近的结构和设施非常重要。

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来源
《Tunnelling and underground space technology》 |2021年第4期|103816.1-103816.21|共21页
作者
Li Zhuofeng; Lin Weian; Ye Junneng; Chen Yunmin; Bian Xuecheng; Gao Fei;
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作者单位

Zhejiang Univ Dept Civil Engn MOE Key Lab Soft Soils & Geoenvironm Engn 866 Yuhangtang Rd Hangzhou 310058 Peoples R China;

Zhejiang Univ Dept Civil Engn MOE Key Lab Soft Soils & Geoenvironm Engn 866 Yuhangtang Rd Hangzhou 310058 Peoples R China;

Ningbo Rail Transit Grp Co Ltd 3399 Ningchuan Rd Ningbo 315101 Zhejiang Peoples R China;

Zhejiang Univ Dept Civil Engn MOE Key Lab Soft Soils & Geoenvironm Engn 866 Yuhangtang Rd Hangzhou 310058 Peoples R China;

Zhejiang Univ Dept Civil Engn MOE Key Lab Soft Soils & Geoenvironm Engn 866 Yuhangtang Rd Hangzhou 310058 Peoples R China;

Zhejiang Univ Dept Civil Engn MOE Key Lab Soft Soils & Geoenvironm Engn 866 Yuhangtang Rd Hangzhou 310058 Peoples R China;

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正文语种 eng
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关键词
Arching effect; Soil movement; Plastic flow; Shear strain; Excavation; Soft clay;

机译：拱起效果;土壤运动;塑料流动;剪切菌株;挖掘;软粘土;

Soil movement mechanism associated with arching effect in a multi-strutted excavation in soft clay

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