隧道固-液-气轴向不耦合装药参数分析及优化  

Analysis and Optimization of Three-phase Axial Uncoupled Charge Parameters of Solid-Liquid-gas in Tunnel Cut Hole

作　　者：阮超 Ruan Chao(The Fifth Project Co.,Ltd.of China Railway Bureau 14 Group,Jining 272117,China)

机构地区：[1]中铁十四局集团第五工程有限公司,山东济宁272117

出　　处：《科学技术创新》2022年第21期137-141,共5页Scientific and Technological Innovation

摘　　要：本文针对目前山区公路隧道和地铁区间隧道中掏槽眼围岩爆破中使用的水-空气装药结构,以钻孔爆破的爆轰理论和岩石断裂力学理论为基础,建立了爆破应力波传导介质为固-液-气三种相组成的轴向不耦合爆破计算模型。本文分析了隧道掌子面掏槽眼炮孔的孔内气压随炸药起爆时间的改变、掏槽眼周边围岩的应力场的时空变化情况以及炮孔围岩裂纹尖端的应力强度因子,同时将重庆市轨道交通十号线二期三标段南坪地铁车站施工通道现场的围岩参数作为理论模型的验算依据,建立ANSYS有限元模型并进行了相应算例分析,研究了轴向情况下的不耦合装药系数对炮孔产生的爆破效果的影响,同时以有限元数值模拟方法对在实际爆破施工中遭遇裂隙岩体情况下的炮孔半径等爆破参数也进行了优化。In this paper,based on the detonation theory and rock fracture mechanics theory of borehole blasting,a calculation model of axially uncoupled blasting with solid-liquid-gas three phases as blasting stress wave conduction medium is established for the water-air charge structure used in the blasting of cutting hole surrounding rock in highway tunnels and subway tunnels in mountainous areas.In this paper,the change of the pressure in the hole with the initiation time of the explosive,the temporal and spatial variation of the stress field of the surrounding rock around the cutting hole and the stress intensity factor of the crack tip of the surrounding rock of the hole are analyzed.At the same time,the surrounding rock parameters of the construction channel of the Nanping subway station in the third bid section of the second phase of the tenth line of Chongqing rail transit are used as the checking basis of the theoretical model.The ANSYS finite element model is established and the corresponding example analysis is carried out.The influence of the uncoupling charge coefficient under the axial condition is studied.At the same time,the blasting parameters such as blast-hole radius in the case of fractured rock mass encountered in the actual blasting construction are also optimized by the finite element numerical simulation method.

关 键 词：隧道 爆破 掏槽眼 轴向不耦合 参数分析及优化 

分 类 号：U455[建筑科学—桥梁与隧道工程]