复杂环境下管道工程接收井爆破开挖方案设计

Design of blasting excavation scheme for receiving well of pipeline engineering in complicated environment

针对复杂环境条件下的接收井爆破作业,通过核准最大单响药量、增加分段数、选择合理微差间隔时间控制爆破振动,并采用挂网式结构防止飞石,优化爆破施工工艺进行爆破开挖作业。结果表明:现场爆破良好,无哑炮,平均炮孔利用率达到90%,爆渣松散、块度均匀,平均块度小于20 cm,且清渣后接收井底面基本达到设计层阶高度,接收井内壁较为稳固,周边水池、民房等均未受到破坏。

In view of the blasting operation of the receiving well in complicated environment,the harmful effect of vibration is controlled by approving the maximum single-response charge,increasing the number of segments,and selecting a reasonable millisecond interval.The hanging net structure is used to prevent flying rocks,and the blasting construction technology is optimized for blasting excavation.The results show that the blasting effect is good,with no misfire.And the average utilization rate of blasthole is 90%,the blast slag is loose and the fragmentation is uniform,furthermore,the average fragmentation is less than 20 cm.After slag cleaning,the bottom surface of the receiving well basically reaches the design altitude.The inner wall of the receiving well is relatively stable,and the surrounding pools and houses are not damaged.