黄土隧道支护系统创新设计

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL
Zhichao Wang, Yuantao Xie, J. Lai, Yongli Xie, Xulin Su, Yu-feng Shi, Chunxia Guo
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引用次数: 16

摘要

初级支护足够的早期强度对于稳定周围环境,特别是在土中施工的隧道至关重要。本文介绍了钢-混凝土组合支护体系(SCCS),这是一种承载能力高、施工灵活、快速的新型支护体系。采用三维数值模型系统地研究了混凝土混凝土混凝土的承载特性和施工性能。还进行了敏感性分析。结果表明,π形钢拱的应力随壁厚的增加而减小,随应力释放速率的增加而线性增大。在拱截面水平方向上,冠和肩的节点应力在纵向上逐渐增大,在垂直方向上,节点应力从上到下逐渐减小。然而,腰部的应力分布与头顶和肩部的应力分布相反。通过对不同安装间隙下拱截面应力的分析,发现拱顶和拱肩处截面应力演化呈阶梯增长趋势。腰部应力演化更有可能呈现缓慢生长阶段和快速生长阶段两阶段的增长趋势。与传统支护相比,SCCS支护的二次衬砌最大拉应力和最大压应力平均降低了38.0%和49.0%。研究结果可为黄土中掘进隧道的支护技术提供参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Designing an innovative support system in loess tunnel
The sufficient early strength of primary support is crucial for stabilizing the surroundings, especially for the tunnels constructed in soil. This paper introduces the Steel-Concrete Composite Support System (SCCS), a new support with high bearing capacity and flexible, rapid construction. The bearing characteristics and construction performance of SCCS were systematically studied using a three-dimensional numerical model. A sensitivity analysis was also performed. It was found that the stress of a π-shaped steel arch decreased with an increase in the thickness of the wall, and increased linearly with an increase in the rate of stress release. In the horizontal direction of the arch section, the nodal stresses of the crown and the shoulder gradually increased in longitudinally, and in the vertical direction, the nodal stresses gradually decreased from top to bottom. The stress distribution at the waist, however, was opposite to that at the crown and the shoulder. By analyzing the stress of the arch section under different installation gaps, the sectional stress evolution was found to have a step-growth trend at the crown and shoulder. The stress evolution at the waist is more likely to have a two-stage growth trend: a slow growth stage and a fast growth stage. The maximum tensile and compressive stresses of the secondary lining supported by SCCS were reduced on average by 38.0% and 49.0%, respectively, compared with the traditional support. The findings can provide a reference for the supporting technology in tunnels driven in loess.
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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