高渗透饱和砂土连续墙开挖过程中的局部稳定性研究

IF 12.2 1区 工程技术 Q1 MECHANICS Applied Mechanics Reviews Pub Date : 2022-10-31 DOI:10.3390/applmech3040072
Yuhang Liu, Linchun Wei, Yanfei Zhu, X. Zhuang
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引用次数: 0

摘要

浆液槽的稳定性在地下连续墙施工中起着至关重要的作用。在目前的研究中,主要研究的是单元槽开挖完成后泥浆槽的局部失稳。然而,基坑开挖过程中的局部稳定问题却很少受到重视。本文对位于高渗透地层的连续墙施工开挖过程中的局部稳定性进行了研究。通过浆体入渗试验,研究了高渗透地层中超孔隙压力的分布规律,从而确定了有效支护压力。在此基础上,对高渗透饱和砂土开挖过程中浆槽的局部稳定性进行了计算。结果表明:按设计规范处理的同类型砂土,不能简单地认为其渗透率相同、超孔隙压力分布相似,滤饼能否形成、滤饼质量好坏是决定超孔隙压力分布的关键因素。这对于高渗透饱和砂土开挖过程中的局部稳定也是至关重要的。建议当浆体入渗方式为纯透水区时,应注意位于高渗透地层的开挖过程中的局部稳定性。
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Local Stability in the Process of Excavation Located in High Permeability Saturated Sand of Diaphragm Wall Construction
The stability of the slurry trench is very important in the construction of the underground diaphragm wall. In the current research, the local instability of the slurry trench is mainly investigated after the excavation of a unit slot is completely completed. However, the local stability in the process of excavation has received little attention. In this paper, the local stability in the process of excavation located in high permeability strata of diaphragm wall construction is investigated. A slurry infiltration experiment was carried out to investigate the distribution of the excess pore pressure in the high permeability strata, which can determine the effective support pressure. Then, the local stability of the slurry trench in the process of excavation located in high permeability saturated sand is calculated. The results show that the same types of sand according to the design code cannot be simply treated to have the same permeability and similar distribution of the excess pore pressure, since whether the filter cake can be formed and the quality of the filter cake are the key factors to determine the distribution of the excess pore pressure. This is also crucial for the local stability in the process of excavation located in high permeability saturated sand. It is suggested that attention should be paid to the local stability in the process of excavation located in high permeability strata when the slurry infiltration mode is the pure permeable zone.
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来源期刊
CiteScore
28.20
自引率
0.70%
发文量
13
审稿时长
>12 weeks
期刊介绍: Applied Mechanics Reviews (AMR) is an international review journal that serves as a premier venue for dissemination of material across all subdisciplines of applied mechanics and engineering science, including fluid and solid mechanics, heat transfer, dynamics and vibration, and applications.AMR provides an archival repository for state-of-the-art and retrospective survey articles and reviews of research areas and curricular developments. The journal invites commentary on research and education policy in different countries. The journal also invites original tutorial and educational material in applied mechanics targeting non-specialist audiences, including undergraduate and K-12 students.
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