人工素填土下浅埋暗挖横通道CRD法施工的地表沉降监测分析

浅埋暗挖隧道距离地表近,施工工序繁多,开挖和支护相互交错,施工过程中地表变形复杂。文章介绍了大连地铁2号线春光街站的工程概况和施工监测方案,并对其横通道地表沉降数据进行了分析研究。分析结果表明,在人工素填土下隧道开挖引起了地表整体下沉呈扁漏斗状,沉降槽特征较为明显;隧道掌子面施工对地表有明显影响,横向影响范围为30 m,纵向影响范围为15 m。由此提出建议,监测布点在掌子面前方15 m、监测有效期限为70 d,即可满足隧道围岩稳定性要求。

Analysis of the Ground Settlement Monitoring of the Shallow Bored Cross Passage Using the CRD Construction Method under Artificial Plain Filling

This paper introduces the engineering survey of the construction monitoring program for the Chunguangjie Station of the Dalian Metro line 2 and analyzes the monitored data of ground settlement.Because the shallow bored tunnel is near to the ground and there are various construction procedures involving the interlacing of support and excavation,the ground deformation is complex during construction.The results showed that the ground settlement caused by tunnel excavation under artificial plain filling takes the form of a flat funnel and the characteristics of a settlement trough are obvious.The tunnel face significantly effects ground settlement during construction,with an influential area of 30m horizontally and 15m vertically.It is recommended that the monitoring points be set 15m ahead of the tunnel face,with a valid period of 70d in order to meet the stability requirement for surrounding rock.