【摘要】 对于采用钻爆法施工的城市隧道,不可避免地存在爆破开挖对邻近建筑物的影响问题。因此,研究爆破振动对地下洞室的影响,不仅具有重要的理论意义,同时也具有重要的工程意义。重庆轻轨大坪车站隧道最小埋深仅4m,最大跨度26.3m,地面人口密集,建筑物林立。采用浅眼多循环,分部开挖,增设周边减震眼及严格控制药量等措施,通过数值模拟爆破震动效果,并与实测结果对比来进行研究,有效地控制了爆破地震动强度,爆破对建筑物没有产生损坏,说明采用的隧道施工新方法和爆破药量是可行的,从而为复杂条件下的特大断面城市隧道施工参数和爆破参数的确定提供了重要的依据。更多还原

【Abstract】 The influence of blasting vibration on the adjacent buildings is inevitable if blasting is employed for excavation. Daping station tunnel of Chongqing light railway project, on which there is dense with population and buildings, has a minimum buried depth of only four meters and maximum span length of 26.3 meters. The stepped excavation mode with short-hole, multi-round and V-shaped cut are adopted. The maximum charge weight of one delayed interval is determined by the permitted vibration velocity. The smooth blasting technology with adding vibration-reduction holes is used. Meanwhile, the charge weight per hole is strictly controlled. With the simulation and on-site test, it is found that the proposed technology for tunnel construction is feasible.更多还原