大当量爆炸地冲击毁伤效应的理论与试验研究Ⅲ:深埋洞室地冲击效应模拟试验研究  

Theoretical and experimental study on ground impact damage effect under large equivalent explosion.PartⅢ:Experimental simulation research of ground impact effect on deep buried caverns

作　　者：李志浩 李杰 王明洋[1,2] LI Zhihao;LI Jie;WANG Mingyang(State Key Laboratory of Explosion and Impact and Disaster Prevention and Mitigation,Army Engineering University of PLA,Nanjing,Jiangsu 210007,China;School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing,Jiangsu 210094,China)

机构地区：[1]陆军工程大学爆炸冲击防灾减灾国家重点实验室,江苏南京210007 [2]南京理工大学机械工程学院,江苏南京210094

出　　处：《岩石力学与工程学报》2023年第5期1162-1174,共13页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(52278419,42102331)。

摘　　要：为厘清开挖扰动和大当量爆炸地冲击扰动对深埋洞室破坏的影响机制,采用自主研制的深埋洞室地冲击效应模拟试验系统,开展从地应力加载、洞室开挖到地冲击扰动加载全过程的相似模型试验。试验模拟了600 m埋深洞室开挖过程,以及封闭爆炸当量90 kt、比例爆距为133 m/kt^(1/3)时的地冲击扰动诱发工程破坏现象。试验成功模拟了颗粒弹射、板裂和块体激活等现象。得到冲击扰动作用下洞周应力、应变和位移的变化规律以及深部洞室的破坏机制。证实了比例爆距为133 m/kt^(1/3)时,洞室处于轻微破坏区。此外,通过开展重复地冲击扰动下的洞室稳定性研究,成功模拟岩爆、板裂、掌子面坍塌等工程灾害,得到重复地冲击扰动下洞室的破坏机制。试验的成功开展,为大当量地下爆炸作用下深埋洞室防护和安全范围确定奠定了重要的基础。In order to clarify the influence mechanism of excavation disturbance and large-equivalent explosion ground impact disturbance on the damage of deeply buried caverns,a similar model test incorporating the whole process of ground stress loading,cavern excavation and ground impact disturbance loading was carried out using the self-developed ground impact effect simulation test system for deeply buried caverns.The tests successfully simulated ground impact disturbance-induced engineering disasters at a burial depth of 600 m,a confinement blast equivalent of 90 kt and a proportional blast distance of 133 m/kt^(1/3).During the test,the phenomena of particle ejection,plate cracking and block activation were simulated successfully.The changes of stress,strain and displacement around the cavern and the failure mechanism of the deep cavern under the impact disturbance were obtained.It is confirmed that the cavern is in the zone of slight damage when the proportional blast distance is 133 m/kt^(1/3).In addition,a research on the stability of the cavern under repeated ground impact disturbance was carried out.Engineering disasters such as rock burst,slab crack and face collapse were simulated successfully,and the failure mechanism of the cavern under repeated impact disturbance was obtained.The successful conduct of the tests has laid an important foundation for the determination of protection and safety limits for deeply buried caverns under the action of large yielding underground explosions.

关 键 词：岩石力学 深埋洞室 地冲击破坏 相似模拟试验 不可逆位移 大当量爆炸 

分 类 号：TU45[建筑科学—岩土工程]