| 袁铮.充填型溶洞发育机理及其对隧道开挖稳定性的影响研究[J].唐山学院学报,2023,36(6):43-47,91 |
| 充填型溶洞发育机理及其对隧道开挖稳定性的影响研究 |
| Study on Development Mechanism of Filled Karst Caves and Its Influence on Stability of Tunnel Excavation |
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| DOI：10.16160/j.cnki.tsxyxb.2023.06.009 |
| 中文关键词: 充填型溶洞 发育机理 隧道 围岩稳定性 数值模拟 |
| 英文关键词: filled karst cave development mechanism tunnel stability of surrounding rocks numerical simulation |
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| 中文摘要: |
| 以云南某隧道工程为研究背景，探究充填型溶洞的发育机理，通过建立有限元数值模型模拟隧道开挖过程，对比有、无充填型溶洞情况下围岩的位移变化和应力场特征。研究结果表明：（1）充填型溶洞的形成受水文气象、地层岩性、地形地貌、构造运动等因素影响；（2）在此工程地质条件下，充填型溶洞对隧道围岩的位移和应力场有影响，相较于拱顶和拱腰处的围岩，对拱底处围岩影响更大，拱底处围岩对隧道开挖也更为敏感；（3）隧道围岩的最大主应力呈现左右对称，拱顶、拱腰处的围岩以压应力为主，拱底处围岩以拉应力为主，拱脚部分出现应力集中现象。 |
| 英文摘要: |
| With a certain tunnel project in Yunnan Province as the research background, this paper explores the development mechanism of filled karst caves. In the study, a finite element numerical model is established to simulate tunnel excavation, and the displacement changes and stress field characteristics of the surrounding rocks under the conditions of presence or absence of filled karst caves are compared. The research results show that:1. The formation of filled karst caves is affected by factors such as hydrometeorology, stratigraphy, topography, tectonic movement; 2. Under these engineering geological conditions, filled karst caves have an impact on the displacement and stress field of the surrounding rocks of the tunnel, and the impact is greater on the bottom rocks than on the the rocks at the top of and at the waist of the arch, and the bottom rocks are also more sensitive to tunnel excavation. 3. The maximum principal stress of the surrounding rocks of the tunnel is symmetrical between left and right, with compressive stress dominant in the surrounding rocks at the top of and at the waist of the arch, and tensile stress dominant in the bottom rocks, and stress concentration phenomena occurs at the foot of the arch. |
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