地铁隧道爆破施工影响的邻近居民楼质点峰值振速研究

Peak particle velocity of adjacent residential buildings influenced by blasting construction of subway tunnel

地铁隧道爆破施工时严重威胁邻近居民楼的结构安全,因此研究邻近居民楼爆破峰值振速是非常必要的。文章基于群孔荷载简化模型、柱面波理论及传统的应力波衰减理论,在考虑高程效应影响下推导质点峰值振速公式。依托乌鲁木齐地铁一号线工程,对一邻近六层居民楼的爆破施工响应进行监测,并将实测质点峰值振速、提出的修正公式预测振速和传统萨道夫公式预测的振速进行对比分析。研究结果表明:采用修正公式预测的质点峰值振速与现场实测值的分布规律一致,呈现出随着高程增大而逐渐增大的趋势;而且现场实测值与修正公式预测值相对误差较小,表明考虑高程因子的修正公式是可行的。

The blasting construction of subway tunnel seriously endangers the structural safety of adjacent residential buildings.Therefore,it is necessary to propose blasting control measures based on the peak blasting vibration velocity.Based on the simplified model of milti-hole load,the cylindrical wave theory,and the traditional stress wave attenuation theory,the formula of peak particle velocity considering the effect of elevation was derived in this paper.The blasting construction response of an adjacent six-story residential building to the Metro Line 1 in Urumqi City was monitored,and the measured peak particle velocity was compared with the vibration velocity predicted by the modified formula and the traditional Sadov's formula.The results show that the distribution of peak particle velocity predicted by the modified formula is inconsistent with the measured value,showing a trend of gradually increasing with the elevation.Moreover,the relative error between the measured value and the predicted value is small,indicating that the modified formula considering the elevation factor is feasible.