Abstract：Research purposes: With the rapid development of urban subway construction, the construction requirements become more and more strict. At present, the existing research is mostly numerical simulation research, and the impact of the change of charging mode is less. The impact of the blasting construction of shallow-buried tunnels on sensitive buildings and the optimization control problem need to be solved. This paper takes the tunnel engineering of Chongqing Metro project as the background, and studies the optimal control of important buildings that need to be frequently crossed during the construction process and are extremely sensitive to the environmental impact. The comparison and analysis of different blasting media are calculated by theoretical derivation and verified by numerical simulation on site. The single hole charge of peripheral holes is optimized, the half hole retention rate is increased, and the blasting vibration speed is controlled. Research conclusions: (1) Compared with air medium, the eccentric uncoupled charge of water medium has more obvious control effect on the overbreak and under-excavation of surrounding holes.(2)The charge structure with radial decoupling coefficient ≥2 shall be used as much as possible for the peripheral hole charge of on-site construction.(3)Under the same conditions of other charging parameters, the radius diameter of the blasting area outside the surrounding rock (the charging deviation side) generally presents a continuous decline or stable change with the reduction of the surrounding rock grade, but the overall trend remains unchanged with the increase of the RQD value in the surrounding rock.(4) The maximum value of numerical simulation is higher than the maximum value of actual monitoring, because the model simplifies the geological conditions and ignores the energy loss of seismic wave propagation in rock joints and fractures.(5)After on-site implementation verification, the optimized blasting scheme can be used to control the impact of blasting construction of shallow-buried and underground excavation tunnels on sensitive buildings.
宗琦, 田立, 汪海波. 水介质不耦合装药爆破岩石破坏范围的研究和应用[J]. 爆破,2012(2): 42-46. Zong Qi,Tian Li,Wang Haibo.Study and Application on Rock Damage Range by Blasting with Water-decoupled Charge[J]. Blasting,2012(2):42-46.
[2]
米中阳. 不耦合系数对水孔爆破效果影响的模型试验研究[D]. 昆明:昆明理工大学, 2019.Mi Zhongyang.Model Test Study on the Influence of Decoupling Coefficient on Water Hole Blasting Effect[D]. Kunming:Kunming University of Science and Technology,2019.
[3]
钟明寿, 龙源, 李兴华, 等. 基于炮孔不同耦合介质的孔壁爆炸载荷及比能时间函数分析[J]. 振动与冲击, 2011(7):116-119.Zhong Mingshou,Long Yuan,Li Xinghua,etc.Time Function for Borehole Explosive Loading and Specific Energy Based on Different Coupling Mediums[J].Journal of Vibration and Shock, 2011(7):116-119.
[4]
程俊飞. 公路隧道裂隙围岩固水气三相不耦合爆破参数优化及应用[D]. 重庆:重庆大学, 2017.Cheng Junfei. Parameter Optimization and Application of Solid Water Gas Three Phase Decoupling Charge in Fractured Surrounding Rock of Highway Tunnel[D]. Chongqing:Chongqing University,2017.
[5]
张迅. 光面爆破不耦合装药参数优化的试验研究[J]. 工程爆破, 2019(6): 27-31.Zhang Xun. Experimental Study on Parameter Optimization of Decoupled Charge in Smooth Blasting[J]. Engineering Blasting, 2019(6):27-31.
[6]
陈俊桦, 张家生, 李新平. 基于岩石爆破损伤理论的预裂爆破参数研究及应用[J]. 岩土力学, 2016(5):1441-1450.Chen Junhua,Zhang Jiasheng,Li Xinping. Study of Presplitting Blasting Parameters and Its Application Based on Rock Blasting-induced Damage Theory[J]. Rock and Soil Mechanics, 2016(5):1441-1450.
[7]
王文龙. 钻眼爆破[M]. 北京:煤炭工业出版社,1984.Wang Wenlong. Drilling and Blasting[M]. Beijing: China Coal Industry Publishing House, 1984.
[8]
范兵旗. 新建小净距隧道爆破施工对既有邻近交叉隧道安全性影响的研究[D]. 重庆: 重庆大学, 2017.Fan Bingqi. Study on the Influence of Blasting Construction of New Small Clear Distance Tunnels on the Safety of Existing Adjacent Crossing Tunnels[D]. Chongqing:Chongqing University,2017.
2023, Vol. 40 
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