暗挖隧道爆破施工对近接地铁车站扰动影响数值模拟分析
蒋桂山1江益辉2张慧琴3郭浩森3
Numerical Simulation Analysis of Concealed Tunnel Blasting Construction Impact on Adjacent Metro Stations
JIANG Guishang1JIANG Yihui2ZHANG Huiqin3GUO Haosen3
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作者信息:1.深圳市市政工程质量安全监督总站， 518001, 深圳
2.中铁南方投资集团有限公司， 518057, 深圳
3.华东交通大学土木建筑学院， 330013, 南昌
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Affiliation:1.Shenzhen Municipal Engineering Quality and Safety Supervision Station, 518001, Shenzhen, China
2.China Railway Southern Investment Group Co., Ltd., 518057, Shenzhen, China
3.School of Civil Engineering and Architecture East China Jiaotong University, 330013, Nanchang, China
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关键词:
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Key words:
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DOI:10.16037/j.1007－869x.20241196
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中图分类号/CLCN:U231.4
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栏目/Col:土建工程
摘要:
目的］深圳城际铁路新建枢纽站通过暗挖隧道下穿既有地铁车站连通车站东西区域。为加快施工进度并确保安全，需研究爆破施工的可行性。［方法］采用LSDYNA数值模拟软件，建立上台阶和下台阶爆破开挖的三维模型，分析不同爆破方式对近接车站的振动影响。［结果及结论］数值计算结果表明:车站底部结构受爆破扰动影响显著；上台阶爆破造成较大损伤，振动速度峰值和最大主应力超出安全范围，而下台阶爆破对车站底部损伤为0，振动峰值大多在1 cm/s以内，最大主应力为0.26 MPa，低于C30混凝土动抗拉强度最小值2.41 MPa；下台阶爆破中掏槽段对车站结构影响较大。为确保施工安全，建议结合控制爆破措施，如设置中空洞和增加延时起爆间隔。
Abstracts:
［Objective］ The newly constructed hub station of Shenzhen Intercity Railway is connected to the east and west areas by a concealed tunnel under-crossing the existing metro station. To accelerate construction progress while ensuring safety, it is necessary to study the feasibility of blasting construction. ［Method］ A three-dimensional blasting excavation model of upper and lower steps is established using LSDYNA numerical simulation software, and the vibration effects of different blasting methods on the adjacent station are analyzed. ［Result & Conclusion］ The numerical calculation results show that: The station bottom structure is significantly affected by the blasting disturbance; The upper step blasting causes great damage, with vibration velocity peak and maximum principal stress exceed the safety range, while the lower step blasting causes zero damage to the station bottom, the vibration peak is mostly within 1 cm/s, and the maximum principal stress is 0.26 MPa, both lower than the minimum dynamic tensile strength of C30 concrete 2.41 MPa; Since the groove section in the lower step blasting has a great impact on the station structure, it is recommended to combine controlled blasting measures, such as setting hollow holes and increasing the delayed detonation interval to ensure the construction safety. The research results provide a reference for actual constructions.
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