繁华城区盾构工程孤石微动探测方法及爆破技术研究
Research on Micro-motion Detection Method and Blasting Technology for Isolated Rocks in Shield Construction in Prosperous Urban Areas
刘皓铭 1宋青山 2苏栋 1曾德成 2平洋 2张晓2
作者信息
- 1. 深圳大学土木与交通工程学院,广东深圳 518060
- 2. 中交隧道工程局有限公司,北京 100024
- 折叠
摘要
微动探测技术以其快速、经济、受场地条件限制小等特点,广泛应用于浅部地质结构探测.孤石在我国南方花岗岩地区普遍存在,为解决盾构机在地层掘进时遇到大直径孤石难处理的问题,以珠海兴业快线(南段)二标为依托工程,采用微动探测技术,基于微动台阵探测地球物理探测方法,利用类空间自相关法-SPAC法从微动台阵记录中提取瑞雷波频散曲线,通过数据分析反映地层岩性变化,解释地质情况.结合钻孔探测的方式精确地获取孤石的大小及位置.采用控制性深孔爆破技术对盾构隧道范围内的孤石进行爆破预处理,优化布孔参数和装药量,根据施工现场取芯情况,爆破效果均可满足单体控制在 30 cm以内,破碎效果良好,完全满足盾构机掘进施工的要求.研究成果可为类似地层盾构施工工程提供借鉴和参考.
Abstract
Micro-motion detection technology is widely used in shallow geological structure detection due to its fast,economic-al,and adaptation to site conditions.Isolated rocks are common in the granite area of southern China.To solve the problem of large-diameter isolated rocks encountered during shield tunneling in the second bid of Zhuhai Xingye Express Line(south section),the fol-lowing approaches were adopted.First,the micro-motion detection technology was used.The micro-motion array detection geophysic-al detection method,and the quasi-spatial autocorrelation method-SPAC method were used to extract the Rayleigh wave dispersion curve from the micro-motion array records.Data analysis can directly reflect the change of formation lithology and explain the geolo-gical conditions.Secondly,the size and location of the isolated rocks can be accurately obtained by combining it with the method of borehole detection.Finally,the controlled deep-hole blasting technology was used to blast the isolated rocks within the scope of the shield tunnel,with optimized hole layout parameters and charge quantity.According to the coring results from the construction site,the blast can ensure a good crushing effect with the size of single body being within 30 cm.This fully meets the requirements of the shield tunneling construction.The research results can provide a reference for shield construction projects in similar strata.
关键词
孤石爆破处理/微动检测/盾构隧道/复合地层Key words
isolated rocks blasting treatment/micro-motion detection/shield tunnel/composite formation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据