侧穿桥桩的隧道爆破设计与模拟  

Blasting Design and Simulation of Tunnel Adjacent to Bridge Piles

作　　者：李岩巍 纪晓琳 于海 闫鸿浩[2] LI Yan-wei;JI Xiao-lin;YU Hai;YAN Hong-hao(Highway School,Chang′An University,Xi′an 710064,China;School of Mechanics and Aerospace Engineering,Dalian University of Technology,Dalian 116024,China;Construction Branch of Shanghai Civil Engineering Group Co.,Ltd.of CREC,Shenyang 110000,China)

机构地区：[1]长安大学公路学院,西安710064 [2]大连理工大学力学与航空航天学院,大连116024 [3]中铁上海工程局集团有限公司建设分公司,沈阳110000

出　　处：《爆破》2025年第1期97-106,174,共11页Blasting

基　　金：国家自然科学基金(12172084)。

摘　　要：以大连地铁5号线石葵路~劳动公园区间工程建设为背景,结合隧道施工工法(台阶法、CRD法),优化掌子面爆破参数,控制区间隧道爆破对桥桩的影响。右线采用台阶法,左线采用CRD法,台阶法的上台阶及CRD法的左上方①部洞室采用两次爆破,第一次为掏槽区域爆破,为第二次爆破提供临空面进而降低爆破振动。掏槽处炸药单耗为1.87~2.33 kg/m^(3),其余部位炸药单耗0.40~0.80 kg/m^(3),最大段别雷管使用Ms-15段非电导爆管雷管。基于实测数据反演爆破振动衰减规律公式,完成爆破振动安全预校核。采用SPH法对临近桥桩掏槽爆破进行数值计算,在单段药量0.3 kg情况下,对5 m远处受到爆炸载荷作用的桥桩进行了响应分析。计算表明桥桩无损伤,且爆破作业结束,桥桩安全无恙,表明侧穿桥桩段的技术方案是可行的。此外,模拟应力波在地层、桥桩中的传播过程,桥桩中应力波传播速度3280~3590 m/s,岩土层中传播速度平均为1620 m/s,数据显示振动在桥桩中传播速度明显大于在风化层与黏土层的传播速度。论文中炸药与临近岩石采用SPH方法,避免了大规模粒子计算对超算能力要求,对于远距离振动分布研究,此方法具有一定的借鉴意义。Taking the construction of Shikui Road Station to Labor Park Station of Dalian Metro Line 5 as the background,a delicate blasting design was used to control the influence of interval tunnel construction on adjacent buildings.In order to prevent the risk of settlement of adjacent bridge piles,a deep hole pre-reinforcement method of non-shrinkage double-liquid grouting(WSS)was used on the tunnel face.The blasting parameters of the tunnel face were optimized,and a detailed blasting design was given by combining with the step sequence of the tunnel construction method(step method and CRD method).The right line utilized the step method,while the left employed the CRD method.The upper bench of the step method and the upper left chamber 1 of the CRD method were blasted twice:initial cutting blasting to create an empty surface followed by secondary blasting to reduce vibration.The unit consumption of explosives in the cutting part was 1.87~2.33 kg/m^(3)and 0.40~0.80 kg/m^(3)in other sections,with the Ms-15 nonel detonator used for maximum section control.In addition,the blasting vibration attenuation law formula was inverted through blasting vibration monitoring,facilitating a pre-check for safety.Furthermore,a numerical simulation using the SPH method was conducted for cutting blasting near side-piercing bridge piles with a single-stage charge of 0.30 kg.The response of the bridge pile located 5 m from the detonation point and subjected to explosive load was analyzed.The blasting operation in this area had been completed,and the piers were safe and sound,indicating that the construction scheme for the side-crossing bridge pile section was feasible.Additionally,the stress wave propagation in strata and bridge piles was simulated,showing speeds of 3280 to 3590 meters per second in bridge piles,and an average speed of 1620 meters per second in rock and soil layers.The propagation speed in bridge piles was significantly higher than in the weathered and clay layers.The SPH method proved effective for large-scale particle cal

关 键 词：隧道 侧穿桥桩 爆破振动 爆破设计 数值模拟 

分 类 号：U455.4[建筑科学—桥梁与隧道工程] U443.15[交通运输工程—道路与铁道工程]