复杂结构体系下隧道爆破震动对房屋影响的试验研究

The Experimental Study for the Effect of Tunnel Blasting Vibration on Surrounding Buildings with Complex Structure System

依托福州鼓山魁歧1号隧道建设工程,根据其埋深不同、左右两线高程不同的特点,采用全站仪和爆破震动自记仪,分别进行震动和沉降监测。左右隧道穿过房屋底部围岩后,房屋与隧道中夹岩形成"T"字型结构体系,通过对不同爆源位置的监测数据分析得出,此体系使房屋两端的质点振速峰值放大2倍,空洞效应明显;振速峰值与房屋层数成正比,上一层比下一层放大1.1倍;先行成洞隧道可作为"减震空洞",有效减弱后行洞开挖对先行洞侧向房屋的影响。通过沉降监测分析得出:隧道埋深不同,易导致上部房屋不均匀沉降而发生剪切破坏,应对基础做加固处理。

Based on the construction project of Tunnel No.1 at Kuiqi,Mount Gushan,Fuzhou and according to the characteristics of different elevations of tunnels at left and right lines with different depths,the subsidence and vibration were monitored respectively with electronic total station instruments and self-recording meters of explosion vibration.After tunnels went through the underneath of the buliding,a ＂T＂ structure of the rocks among the buildings and tunnels was formed,through the analysis of monitoring data at different blasting places,which made the peak of oscillation be enlarged twice at both ends of the building,the effect of hole was obvious;the peak of oscillation was directly proportional to the storeys of the building and the peak of oscillation at upper storey was 1.1 times larger than that at lower storey;it concluded that the tunnel line first excavated seemed to be the damping hole,effectively weakening the effect of the another line excavation on the buildings at the sides of first tunnel.The analysis of subsidence monitoring showed that the tunnels with different depths could cause the shear failure becease of uneven settlements of surface buildings,so their foundations should be reinforced.