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基于离散元法的圆型、城门洞型洞室岩爆现象模拟

Simulation of Rockburst Phenomena in Circular and City Gate Cavern Based on Discrete Element Method
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摘要 针对深埋地下隧洞工程开挖过程中岩爆的破坏机理问题,以齐热哈塔尔水电站的引水隧洞中发生的岩爆现象为例,以室内试验为基础,建立圆型与城门洞型洞室的二维离散元模型,对比分析不同断面形状下岩爆现象的发生情况,探究岩爆的破坏机理。结果表明,不同开挖形状的洞室在岩爆破坏形式及位置上存在一定差别;侧压力系数对洞室开挖后的应力集中区域有较大影响,岩爆破坏随侧压力系数的增大趋于严重;圆型洞室发生岩爆破坏时所需应力较小,相对于城门洞型洞室更稳定;城门洞型洞室在边墙与底板交接处存在易发生岩爆的相对薄弱区,施工时需对其进行加固处理。 Aiming at the failure mechanism of rockburst during the excavation process of deep buried underground tunnel, this paper takes the rockburst phenomenon occurring in the diversion tunnel of Qizhalhaal Hydropower Station as the research object. Based on the laboratory test, a two-dimensional discrete element model of two different cross-sectional caverns with circular and gate hole types is established. The occurrence of rockburst phenomenon under different cross-section shapes is analyzed, and the failure mechanism of rockburst is explored. The results show that there are some differences in the form and location of rockburst failure in different excavation-shaped caverns;The lateral pressure coefficient has a great impact on the stress concentration area after excavation of the cavern;The rockburst failure shows a gradual serious trend with the increase of the lateral pressure coefficient;The stress required for rockburst failure in a circular cavern is relatively small, and it is more stable than the city gate cave type cavern;The city gate cave type cavern has a relatively weak area where rockburst is likely to occur at the intersection of the side wall and the floor, and it should be reinforced during construction.
作者 袁周祥 刘翌晨 高轩 YUAN Zhou-xiang;LIU Yi-chen;GAO Xuan(School of Water Conservancy and Hydroelectric Power, Hebei University of Engineering, Handan 056002, China;China Power Construction Southern Construction Investment Co., Ltd., Shenzhen 518035, China)
出处 《水电能源科学》 北大核心 2019年第8期73-75,42共4页 WATER RESOURCES AND POWER
关键词 岩爆现象 破坏机理 离散元方法 洞室形状 rockburst phenomenon failure mechanism discrete element method cave shape
作者简介 袁周祥(1994-),男,硕士研究生,研究方向为水工结构工程、岩土工程及离散元数值模拟等,E-mail:yuan94218@163.com.
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