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| 破碎岩体隧洞开挖应力拱效应 |
| Stress arch effect of tunnel excavation in broken rock mass |
| 投稿时间：2023-04-21 修订日期：2023-07-02 |
| DOI： |
| 中文关键词: 破碎岩体；地下洞室；离散元；应力拱 |
| 英文关键词: Broken rock mass; Underground cavern; Discrete element; Stress arch |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
| 作者 | 单位 | 邮编 | | 胡浩 | 河南恒禹水利工程有限公司 | 465399 | | 石崇* | 河海大学岩土工程研究所 | 210024 |
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| 中文摘要: |
| 地下开挖会破坏岩体内部的初始平衡状态，引起围岩应力调整以趋向新平衡。这一应力重分布行为是扰动围岩自行组织稳定的过程，即为应力拱效应。破碎岩体由于结构面的存在，开挖后围岩力学行为必然不同于其他岩体。本文基于离散元软件分析不同影响因素下破碎岩体开挖后围岩应力重分布特征和应力拱形态，研究结果表明：破碎岩体地下开挖过程中应力拱的形态受到块体大小、岩层倾角及侧压系数的影响，总体呈负相关的趋势。研究成果可为隧洞稳定性研究及支护衬砌提供依据。 |
| 英文摘要: |
| Underground excavation will destroy the initial equilibrium state of the rock mass and cause the stress adjustment of the surrounding rock to tend to the new equilibrium. This redistribution of stress is a process of self-organization and stability of disturbed surrounding rock, which is called stress arch effect. Due to the existence of structural plane, the mechanical behavior of surrounding rock after excavation is different from other rock masses. Based on the discrete element software, this paper analyzes the stress redistribution characteristics and stress arch shape of surrounding rock after excavation of broken rock mass under different influence factors. The research results show that the shape of stress arch during underground excavation of broken rock mass is affected by block size, rock inclination and lateral pressure coefficient, and the overall trend is negative correlation. The research results can provide a basis for the study of tunnel stability and support lining. |
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