考虑不同倾角的富水倾斜复合地层盾构隧道工作面稳定性试验研究

IF 4.3 2区 工程技术 Q1 ENGINEERING, OCEAN Applied Ocean Research Pub Date : 2024-11-13 DOI:10.1016/j.apor.2024.104323
Xiaopu Cui , Pengfei Li , Zhaoguo Ge , Shaohua Li , Yang Chen
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引用次数: 0

摘要

盾构法在地下或海底隧道施工中发展迅速。隧道开挖面的稳定性对隧道的安全施工至关重要,尤其是在富水地层和倾斜地层中。本研究在富水倾斜地层中进行了盾构模型试验,分析了地表沉降、地面土压力、失稳区域以及失稳过程中的破坏机制。结果表明,随着隧道边界线向后距离的增加,纵向监测点的沉降量减少。此外,横向监测断面的沉降分析表明,最显著的沉降发生在隧道正上方。当与隧道开挖面距离相等时,隧道前方的地表沉降量明显大于隧道后方。当倾斜角为负值时,无论地表塌陷的宽度还是高度,影响程度都最大。DIC 图像分析的应用表明,在不同的地层倾角下会观察到不同的破坏机制。随着向后距离的增加,剪切应变集中变得更加明显,导致剪切带主要分布在隧道前方和上方。与富水水平分层或均质土层相比,富水倾斜地层的地表塌陷程度、地层扰动范围和地层失稳机理都存在明显差异。因此,在面对涉及倾斜地层的工程项目时,必须考虑地质因素的影响。
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Experimental study on face stability of shield tunnel in water-rich inclined composite strata considering different inclination angles
Shield method has developed rapidly in the construction of underground or subsea tunnels. The stability of the tunnel excavation face is essential for the safe construction of tunnels, particularly in water-rich and inclined strata. The present study conducted shield model tests in water-rich inclined strata to analyze the surface settlement, ground earth pressure, areas of instability, and failure mechanism during the process of instability. The results indicate a decrease in settlement of the longitudinal monitoring points as the backward distance from the tunnel boundary line increases. Additionally, the settlement analysis of transverse monitoring sections reveals that the most significant settlement occurs directly above the tunnel. When equidistant from the tunnel excavation face, the surface settlement exhibits a significantly greater magnitude in front of it compared to behind it. The extent of influence is maximized when the inclination angle is negative, regardless of whether it pertains to the collapse in width or height on the surface. The application of DIC image analysis reveals that distinct failure mechanisms are observed for varying stratum inclination angles. The shear strain concentration becomes more pronounced with an increase in the backward distance, resulting in predominant distribution of shear bands in front of and above the tunnel. Compared to water-rich horizontal stratification or homogeneous soil layers, there are distinct variations in surface collapse magnitude, stratum disturbance range, and the instability mechanism of stratum instability in water-rich inclined strata. Therefore, when confronted with engineering projects involving inclined strata, it is imperative to consider the influence of geological factors.
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来源期刊
Applied Ocean Research
Applied Ocean Research 地学-工程:大洋
CiteScore
8.70
自引率
7.00%
发文量
316
审稿时长
59 days
期刊介绍: The aim of Applied Ocean Research is to encourage the submission of papers that advance the state of knowledge in a range of topics relevant to ocean engineering.
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