深层软岩隧道多层衬砌的破坏特征和协同承载机理的试验研究

IF 8.2 1区 工程技术 Q1 ENGINEERING, CIVIL
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引用次数: 0

摘要

多层衬砌因其在防止大变形危害方面的优异性能,已被广泛应用于深层流变软岩隧道。以往的研究主要集中在多层衬砌的承载能力上,但其在高地质应力下的破坏特征和协同承载机理尚不清楚。为填补这一空白,本研究进行了三维地质力学模型试验,并分析了协同机制。模型试验分为正常加载、开挖和超载阶段。使用改进的高精度伸长计测量系统对围岩变形进行了监测。结果表明,在开挖阶段,最大的径向变形出现在侧壁,其次是底板和拱顶。侧壁弹簧的相对收敛变形达到 1.32 毫米。多层衬砌在超载阶段的破坏特征经历了稳定、裂缝起始、局部破坏和坍塌的演变过程,安全系数分别为 1.0-1.6、1.6-2.0 和 2.0-2.2。协同承载力机理分析结果表明,大变形支护措施的早期刚度和后期屈服变形能力在深层软岩隧道施工和运营的稳定性维护中发挥着重要作用。因此,建议将屈服支护或可压缩层与加固支护相结合,以减轻高地质应力的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental investigation on the failure characteristic and synergistic load-bearing mechanism of multi-layer linings for deep soft rock tunnels
Multi-layer linings have been widely used in deep rheological soft rock tunnels for the excellent performance in preventing large-deformation hazards. Previous studies have focused on the bearing capability of multi-layer lining, however, its failure characteristics and synergistic load-bearing mechanisms under high geo-stress are still unclear. To fill the gap, three-dimensional geomechanical model tests were conducted and synergistic mechanisms were analysed in this study. The model test was divided into normal loading, excavating, and overloading stages. The surrounding rock deformation was monitored by using an improved high-precise extensometer measurement system. Results show that the largest radial deformation appears on the sidewall, followed by the floor and vault during the excavating stage. The relative convergence deformation of sidewalls springing reaches 1.32 mm. The failure characteristics of the multi-layer linings during the overloading stage undergo an evolution of stability, crack initiation, local failure, and collapse, with a safety factor of 1.0–1.6, 1.6–2.0, and 2.0–2.2, respectively. The synergistic load-bearing mechanism analysis results suggest that the early stiffness and late yielding deformation capacity of large deformation support measures play important roles in stability maintenance both in the construction and operation of deep soft rock tunnels. Therefore, the combination of yielding support or a compressible layer with reinforced support is recommended to mitigate the effect of the high geo-stress.
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来源期刊
Underground Space
Underground Space ENGINEERING, CIVIL-
CiteScore
10.20
自引率
14.10%
发文量
71
审稿时长
63 days
期刊介绍: Underground Space is an open access international journal without article processing charges (APC) committed to serving as a scientific forum for researchers and practitioners in the field of underground engineering. The journal welcomes manuscripts that deal with original theories, methods, technologies, and important applications throughout the life-cycle of underground projects, including planning, design, operation and maintenance, disaster prevention, and demolition. The journal is particularly interested in manuscripts related to the latest development of smart underground engineering from the perspectives of resilience, resources saving, environmental friendliness, humanity, and artificial intelligence. The manuscripts are expected to have significant innovation and potential impact in the field of underground engineering, and should have clear association with or application in underground projects.
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