中风化岩层下爆破成孔灌注桩振动影响预测分析

Prediction and analysis of vibration influence of cast-in-site pile by blasting under geological conditions of moderately weathered rock strata

结合广西九洲国际工程施工的大直径人工挖孔扩底灌注桩,介绍其在中风化岩层地质条件下的爆破成孔施工工艺,并通过爆破测振仪对爆破成孔施工过程中土体质点的振动速度进行了系统的监测、数据搜集和统计分析,预测了爆破产生的振动对周边建筑物的影响程度,为保证工程临近的人工挖孔扩底灌注桩新浇大体积混凝土和临近建筑物的安全提供了科学依据.

In combination with the large diameter manually excavated and cast-in-site pile in construction of Guangxi Jiuzhou international project,the blasting construction process of large diameter manually excavated and cast-in-site pile under geological conditions of moderately weathered rock strata is introduced,and through the blasting vibration meter,the systematic monitoring,data collection and statistical calculations are carried out for the vibration of soil mass particles during blasting construction process.The influencing degree of horizontal vibration caused by blasting on the surrounding buildings is predicted,which provides scientific basis for ensuring the safety of newly cast large volume concrete of manually excavated and cast-in-site pile and adjacent buildings.