基于爆破等效荷载的大型地下洞室群合理间距分析  

Analysis of reasonable spacing of large underground caverns based on blasting equivalent load

作　　者：王登科 骆建军[1,2] 高立平 李飞龙 王磊[1,2] WANG Dengke;LUO Jianjun;GAO Liping;LI Feilong;WANG Lei(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Key Laboratory of Urban Underground Engineering of the Ministry of Education,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]北京交通大学城市地下工程教育部重点实验室,北京100044

出　　处：《中南大学学报（自然科学版）》2022年第6期2224-2233,共10页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51978041)。

摘　　要：为解决爆破数值计算中存在的建模复杂、爆破荷载施加不准确和计算难以收敛等问题,基于叠加原理和应力波衰减理论,优化爆破等效荷载在隧道群孔中的施加方法,提出大型地下洞室爆破等效荷载计算模型,并依托实际工程验证计算模型的准确性,实现地下洞室群爆破开挖时围岩动力响应的快速计算。研究结果表明:扩建洞室爆破开挖,已建洞室迎爆侧边墙的质点振动存在放大效应,峰值振速放大1.5~2.1倍,这种放大效应随洞室间距增大而减小;扩建洞室爆破开挖引起已建洞室内部油体的振动很小,峰值振速为0.01~0.19 cm/s,爆破开挖对油体储存影响很小;将已建洞室迎爆侧边墙处峰值振速作为判断指标,根据“爆破安全规程”,建议依托地下洞库工程两期洞室净间距不小于50 m。The propose of the study is to solve the problems of complex numerical modeling,inaccurate application of blasting loads and difficult convergence of calculation in blasting numerical calculation.Based on the superposition principle and stress wave attenuation theory,the deficiencies of the blasting equivalent load application method in the tunnel group holes were optimized and the calculation model of blasting equivalent load in large underground caverns was derived.Relying on the actual engineering,the accuracy of the calculation method was verified and the rapid calculation of the dynamic response of the surrounding rock during the blasting and excavation of the underground cavern group was realized.The results show that during the blasting and excavation of the expanded cavern,vibration of mass point at the side wall facing blast of the built cavern has amplification effect.The peak vibration velocity is amplified by 1.5−2.1 times and the amplification effect decreases with the increase of the distance between the caverns.The blasting excavation of the expanded cavern caused very little vibration of the oil body inside the already built cavern,with a peak vibration velocity of 0.01−0.19 cm/s,and the blasting excavation has little effect on the oil body storage.The peak vibration velocity at the side wall facing blast of the built cavern was taken as the judgment index,and it is recommended that the net distance between the two phases of the underground cavern project should not be less than 50 m according to the"Blasting Safety Regulations".

关 键 词：爆破等效荷载 大型地下洞室群 数值模拟 动力响应 合理间距 

分 类 号：TU751.9[建筑科学—建筑技术科学]