摘要
以某交通枢纽综合体超大超深岩质基坑工程为背景,阐述基坑工程分期、分区施工的组织方案;给出精细化控制爆破设计施工参数(主要包括开挖方式、施工分区、爆破顺序、孔网参数、装药参数及爆破网络设计等);形成板肋式锚杆挡墙的逆作法施工技术,并重点论述了大直径多杆体超长锚杆结构参数和施工关键技术。研究表明:所采用的超大超深岩质基坑工程分期、分区施工组织方案,提高了土石方开挖和基坑支护的效率;采用的数码电子雷管精细化控制爆破技术,可将周边高层建筑物和地下结构的爆破振动速率控制在1. 0 cm/s以内;板肋式锚杆挡墙逆作法施工技术可有效控制邻近建筑物的沉降和倾斜变形。
This paper is based on a super large and deep rock foundation pit in a traffic hub complex,expounding the organization plan of foundation pit construction by stages and zones; giving the design and construction parametersof finecontrol blasting( mainly including excavation pattern,construction division,blasting sequence,hole network parameters,charging parameters and blasting network design,etc.); forming the reverse construction technique of platelux typeanchor retaining wall,and emphatically discussingthe structural parameters and key construction techniques of large-diameter multi-bar super-long bolt. Research shows that the staging and zoning construction organization planused in thesuper largeand deep rock foundation pit engineering improves the efficiency of earth-rock excavation and foundation pit support; with the using of digital electronic detonator fine control blasting technology,the blasting vibration of the surrounding high-rise buildings and underground structures is obviously controlled within 1. 0 cm/s; the reverse construction technology of plate-lux type anchor retaining wall can effectively control the settlement and inclination deformation of adjacent buildings.
引文
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