土岩地层超深基坑结构反向对接施工技术

Reverse Docking Construction Technology of Ultra-deep Foundation Excavation Structures in Soil-rock Stratum

随着国家建设事业的不断发展,建设区域所处位置的地质条件与周围环境条件越来越复杂,在近年来承建的多项超深基坑工程项目中,施工区域所处环境复杂,所建工程需进行半开挖、半爆破施工。而且位于基坑下半部的岩层内岩溶裂隙发育,岩层内含有大量岩溶裂隙水,对施工的安全及环境影响保护要求极高。以南钢宽厚板工程旋流池基坑为例,针对工程中所遇到的技术难题及今后深基坑专业发展趋势进行了总结。

Along with the continuous development of the state construction, geographic conditions of construction areas and their surrounding environmental conditions become more and more complex. In the few ultra-deep foundation excavation projects constructed in recent years, the circumstances of the construction areas were so complicated that the projects had to be carried out by the combination of excavation and blasting. Besides, the karst fissure development of the rock strata at the lower part of the foundation excavation and the plenty of karst fissure water within the strata lead to rather high requirements for construction safety and environmental protection. This technique takes the swirl pool foundation excavation of Nanjing Steel Wide and Heavy Plate Project as an example and summarizes the technical problems encountered in the project as well as professional development trend of deep foundation excavations in future.