隧道爆破振动与不均匀沉降对建筑物耦合影响分析

Analysis of coupling influence of tunnel blasting vibration and uneven settlement on buildings

为研究爆破振动与不均匀沉降对邻近建筑物的耦合影响规律,利用Midas GTS软件建立建筑物—地层—隧道数值计算模型,将爆破振动(动荷载)和不均匀沉降(静荷载)依据荷载叠加原理耦合作用在数值模型中,分析了耦合荷载下建筑物位移变化、建筑物扭曲变形和建筑物应力变化的规律.结果表明:动荷载和静荷载耦合作用下建筑物基础纵、横轴方向的最大沉降量分别为2.60、2.35 mm;位于沉降严重区域的板扭曲变形为1.57×10^-5 rad/m,相对较小;建筑物各层边柱与梁交界处出现应力集中现象,是施工过程中建筑物的薄弱部位.

In order to study the law of coupling influence of blasting vibration and uneven setlement on adjacent buildings,a numerical calculation model of building-stratum-tunnel is established by Midas GTS software.The blasting vibration(dynamic load)and uneven settlement(static load)are coupled according to the principle of load superposition,and the law of building displacement variation,the distortion of buildings and the stress changes of buildings under coupled loads are analyzed.The results show that the maximum settlement of buildings along the longitudinal and transversal axes of the foundation is 2.60 mm and 2.35 mm respectively under the coupling of blasting vibration(dynamic load)and uneven settlement(static load);the distortion of the plate is 1.57×10^-5 rad·m1in the severe settlement area,which is relatively small;the stress concentration occurs at the junction of the side columns and beams of each layer of the building,which is a weak part of the building during construction.