爆炸平面波作用下大跨度洞室的抗爆性能研究  

Study on Antiknock Performance of Large Span Cavern under Explosive Plane Wave

作　　者：王建龙 徐景茂 顾金才 唐海 谢冰[3] Wang Jianlong;Xu Jingmao;Gu Jincai;Tang Hai;Xie Bing(School of Resourcess,Environment and Safety Engineering,University of Science and Technology of Hunan,Xiangtan,Hunan 411201,P.R.China;Institution of Engineering Protection,IDEt AMS,PLAt Luoyang,Henan 471023,P.R.China;School of Architecture and Construction,Luoyang institute of technology,Luoyang,Henan 471023,P.R.China)

机构地区：[1]湖南科技大学资源环境与安全工程学院,湖南湘潭411201 [2]军事科学院国防工程研究院工程防护研究所,河南洛阳471023 [3]洛阳理工学院土木工程学院,河南洛阳471023

出　　处：《地下空间与工程学报》2021年第5期1613-1621,1629,共10页Chinese Journal of Underground Space and Engineering

摘　　要：为研究大跨度洞室在爆炸平面波作用下的抗爆性能,采用Froude相似理论对大跨度洞室在锚喷衬砌支护与不支护两种情况下进行抗爆模型试验,比较和分析两种洞室在不同工况下位移、应力、和应变的差别。结果表明,两种洞室的拱顶位移集中现象最明显,开始毛洞拱顶垂直应力略大,但随着药量的增加和爆距的减小,支护洞室拱顶应力逐渐增大直至大于毛洞受力。以其临界破坏荷载计算安全系数显示:毛洞仅相当于支护洞室的50%。对洞室的临界破坏进行数值模拟发现:各工况下,毛洞拱顶部位及其周边岩体产生的位移形变均大于支护洞室,主要是锚喷衬砌支护对洞室周边围岩的刚度、密度影响,减小拱顶荷载集中,增强了洞室的抗爆能力。数值模拟与试验结果基本一致,表明研究结论可靠性较高,对后续开展大跨度洞室抗爆模型试验和抗爆加固技术研究具有重要的参考价值。To research the antiknock performance of large span cavern under explosive plane wave,the model tests are carried out based on Froude similarity theory.One of the cavern is supported by bolt-shotcrete and lining,and the other one has none.The differences of the macro failure,stress,and strain around the cavern,the relative displacement of the wall,and so on of the caverns are compared and analyzed in different cases.The results showed that the vaults of both caverns are most obvious to concentrate displacement.The vertical stress on the vault of unsupported cavern is slightly greater in design condition.Under the overload condition that quantities of explosive are increased and blasting distance is decreased,the stress on vault of the supported cavern is larger than unsupported cavern,and the gap is growing.The calculation of the safety factor of both caverns which is based on their critical failure load showed that the stability of unsupported cavern is much less than supported one,it’s only half of the latter.On this bais,numerical simulation calculation with the critical failure load is carried out.The calculation results which are validated with partial test data showed that the displacement-deformation on vault and surrounding rock of unsupported cavern are both greater than supported one in every condition.It is the bolting and shotcreting lining support on the surrounding that increase rock stiffness and density,which reduces the load concentration of the vault and enhances the anti-explosion ability of the cavern.The numerical simulation is basically identical with the test data,which reflects that the research conclusion has high reliability.And it has important reference value for the following research on antiknock model test and the reinforcement technology of large span cavern.

关 键 词：大跨度洞室 抗爆模型试验 数值模拟 临界破坏荷载 

分 类 号：O383[理学—流体力学]