摘要
【目的】探究地下洞室群爆破开挖过程中对邻近洞室安全稳定的影响。【方法】依托某地下储备工程,开展地下洞室群穹顶爆破开挖对邻近洞室的影响分析,研究不同埋深对邻近洞室动力响应影响。【结果】研究表明:支坑道爆破开挖工况相对于主坑道为上穿或下穿关系,位移响应与振速响应情况主要以竖向为主。主坑道的剪应力主要集中范围扩展到拱腰部位,最大剪应力出现在迎爆侧直墙中部附近,但仍处于主坑道围岩的抗拉强度范围内;穹顶外环爆破开挖时,对应内圆结构振速、位移响应均较大,拱顶、拱腰以水平为主,与穹顶外环接壤的拱脚位置则以竖向为主,最大拉应力和最大剪应力均出现在拱脚附近的围岩。【结论】工程中可在穹顶内圆、外环交界处设置型钢支撑,加强穹顶内圆结构的稳定性;在相同爆破条件下,且处于深埋状态时,埋深对邻近洞室振速响应几乎无影响。
【Objective】The influence of blasting excavation of underground cavern group on the safety and sta-bility of adjacent cavern was researched.【Method】Based on an underground reserve project,this study carried out an analysis of the influence of blasting excavation of underground cavern group dome on adjacent cavern,and the influence of different burial depths on the dynamic response of adjacent cavern was studied.【Result】The result shows that the blasting excavation conditions of branch tunnel are in the relationship of up or down tunneling,and the displacement response and vibration velocity response are mainly in the vertical direction.The shear stress of the main tunnel mainly extends to the hance,and the maximum shear stress appears near the mid-dle of the straight wall,but it is still within the tensile strength range of the surrounding rock of the main tunnel.
作者
赵靖
吴铭祥
闵胜
Zhao Jing;Wu Mingxiang;Min Sheng(Unit 94968,PLA,Nanjing 211100,China;Nanchang Wanpo Engineering Design&Consulting Co,Ltd.,Nanchang 330038,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China)
出处
《华东交通大学学报》
2024年第4期54-63,共10页
Journal of East China Jiaotong University
基金
国家自然科学基金项目(52278401)。
关键词
地下洞室群
爆破开挖
动力响应
穹顶
underground cavern group
blasting excavation
dynamic response
vault
