土岩组合地区浅埋暗挖隧道地表沉降监测研究

Monitoring and Analysis of Surface subsidence of Tunnel with Shallow Depth Subsurface Excavation Methodin Soil-stone Assorted Area

本文以青岛地区某暗挖车站的工程实例为依托，通过对施工监测数据进行分析，并结合该地区典型的土岩组合地层条件，得出拱盖法施工过程中左右导洞开挖所造成的地表沉降规律：纵向上，随着掌子面的不断推进，地表沉降可分为微弱变形阶段、急剧变形阶段、缓慢变形阶段和变形稳定阶段；横向上，左导洞的先行开挖会在隧道中线左侧上方形成单侧地表沉降槽，待左右导洞完全开挖后则会在隧道中线两边形成双侧地表沉降槽，其影响范围为隧道中线两侧10m左右。进一步对引发地表沉降的各种影响因素进行分析，提出旨在控制地表沉降的相应技术方案，这对后续类似工程地质条件下的地铁施工起到良好的指导作用。

Based on the engineering example of a dark dug station in Qingdao, this paper analyzed the eonstruetion monitoring data and eombined the typieal soil and roek formation eonditions in this area, and obtained the surfaee subsidenee law- eaused by the left and right tunnel exeavation in the eonstruetion process of the areh eover method. In the longitudinal direetion, with the eontinuous advaneement of tunnel faee, the surfaee settlement eould be divided in- to four stages, namely, weak deformation stage, rapid deformation stage, slow deformation stage and deformation stabi- lization stage. In the lateral direetion, the first tunnel piloting of the left guide eould eontribute to unilateral ground settling tank above the left side of the tunnel eenter line. After the left and right piloting tunnels were eompletely ex- eavated, a bilateral ground settling tank was formed on both sides of the tunnel eenter line, and the influential range was 10 meters on both sides of the tunnel eenter line. Then, the paper analyzed various influeneing faetors of ground subsidenee, putting forward the eorresponding teehnieal sehemes for eontrolling ground subsidenee, whieh played a guiding role for the subsequent subway eonstruetion under similar engineering geologieal eonditions.