45m深基坑减振爆破技术

Damping and Blasting Technology for 45m Deep Foundation Pit

为了对重庆市江北城轨道车站开挖爆破进行减振优化设计,采用ANSYS/LS-DYNA动力学分析方法模拟了车站基坑开挖爆破过程,分析了爆破所引起的基坑围护桩、竖井结构、区间隧道结构物的振动速度响应;根据数值模拟结果提出了合理的减振方案;对比分析了数值模拟值与现场监测数据。结果表明:数值模拟值与现场监测数据表现出相同的衰减规律;合理的减振爆破方案设计能有效地减小爆破对结构产生的影响;设置减振隔离带是一种有效的减震方法。

In order to optimize the damping and blasting excavation design of Jiangbei railway station in Chongqing,dynamic FEM research was carried out based on ANSYS/LS-DYNA,and the vibration velocities of retaining pile,air shaft,tunnel structure caused by blasting during the excavation process were analyzed and compared. According to the numerical simulation results,the reasonable damping strategy was proposed,and simulation data and monitoring data in field were compared and analyzed. It is indicated that simulation data and monitoring data have the same attenuation law; the blasting impact on the structure is effectively reduced by a reasonable damping design; and setting damping isolation belt is an effective method for damping.