软弱地层下临近居民建筑深基坑施工技术探讨

Deep Excavation in Soft Soils Adjacent to Historical Buildings

伴随着城市轨道交通的普及,城市内进行深基坑开挖的工程越来越多。我国较为发达的城市,大多为河道冲积形成的地层,该地质条件下,建设面临老旧民用建筑保护的难题。通过科学综合运用槽壁加固、新型复合膨润土、轴力伺服等技术措施,可以明显提高基坑变形控制,也能降低施工对环境的影响。以南京地区某车站为例,综合采用槽壁加固、新型复合膨润土、轴力伺服、科学按需降压回灌等技术措施,车站基坑施工各项技术指标参数均在可控范围之内,能较好地解决老旧民用建筑的保护难题。

With the popularization of urban rail transit,more and more deep excavation projects are carried out in urban areas.In the more developed cities,most of the strata are formed by alluvium near rivers.Under such geological conditions,the proposed construction is increasingly faced with the issues associated with historical building protection.By the scientific and comprehensive use of technical measures such as waler wall reinforcement,new composite bentonite and axial force controlled system,the deformation control of foundation excavation can be significantly improved and the impact of the construction on the environment can be reduced.This paper presents a metro station excavation in Nanjing area as an example.The paper adopts these technical measures as waler wall reinforcement,new compound bentonite,axial force controlled system,and scientific decompression and recharge as needed.All these parameters of the foundation excavation support construction were within the controllable range,and the comprehensive application of the above measures could better solve the concerns of the historical building preservations.