基于多建构筑物不同振速控制的坐标点阵化隧道安全单段药量计算方法

A coordinate lattice computational method of safe charges per delay in a tunnel under different vibration velocities

城市隧道附近建筑物众多且有不同振速要求,同时满足多种建筑物振速要求的安全药量计算是一个过去城市隧道爆破尚未解决的技术与理论难题。为解决该问题,以观音桥隧道为背景,分别建立隧道曲线与不同建筑物的独立坐标系,基于坐标变换,通过MATLAB程序求解隧道点至各建筑物轮廓点阵的最小距离,代入公式分别计算药量值,取最优药量为设计药量,得到隧道各点桩号-安全药量图,为方便进行现场爆破设计,基于上述原理编写LabVIEW可执行程序,对各循环设计相应的爆破参数。现场应用结果表明:计算得到的安全药量满足多建筑物多安全振动控制要求。与解析法相比,该方法简便易于推广,对城市隧道药量计算有重要意义。

Different buildings around a tunnel in urban have different vibration velocities requirement.It is an unsolved technological and theoretical problem on how to calculate the blasting charge that can satisfy different vibration velocities allowed for all nearby buildings in blasting design.In order to solve this issue,with a case study of Guanyinqiao tunnel as the background,the independent coordinate systems of the tunnel curve and different buildings were established.Based on the coordinate transformation,the values of the shortest distance from the tunnel point to the lattice of each building’s contour were solved by MATLAB program,and substituted to the formula.The charges were calculated respectively,taking the minimum value as the chosen charge,and getting the tunnel location vs blasting charges curve.The LabVIEW executable program was written based on the process mentioned above which facilitates the on-site blasting design.The corresponding blasting parameters were set up for each cycle.The application in the tunnel shows that the safe charges calculated by this method can satisfy the requirements of different vibration velocities.Compared with the analytical method,this method is convenient and easy to promote,and it is important for the charge calculation of urban tunnel.