上跨盾构隧道的地下空间开发技术

Development Technology of Underground Space over Shield Tunnel

深圳前海交易广场项目位于地铁1号线鲤鱼门—前海湾区间上方,该项目的地铁保护工程实施难度大。本文对场地及工程历史进行了调查,根据盾构足尺模型试验等对地下空间开发方案进行了研究,提出了包含分仓小竖井开挖、门架式桩板保护、EPS板缓冲隔离、静压钢板桩隔离等措施的成套地铁保护技术。该套技术有效控制了隧道整体回弹变形和侧移,减少了附加荷载对隧道的影响,保护了既有地铁。

The Shenzhen Qianhai Exchange Plaza project is located above the Leiyumen-Qianhai Bay section of Metro Line 1,and the subway protection of this project is difficult to implement.This paper investigated the site and engineering history,and studied the underground space development plan based on the full-scale shield model test.A complete set of metro protection technologies including measures such as separate excavation of small vertical shafts,portal-framed protection,EPS board buffer isolation,and steel sheet pile under static pressure isolation were proposed.This set of technology can effectively control the overall rebound deformation and lateral displacement of the tunnel,reduce the impact of additional loads on the tunnel,and protect the existing subway.