深圳地铁竹侨区间新增竖井马头门开裂治理技术

Treatment to crack in the connection of running tunnel to a newly built shaft

深圳地铁一期工程竹侨区间新增竖井,在正线马头门下台阶施工中,由于所处围岩富水、软弱,遇水成流塑状,造成马头门开裂下沉,上台阶已作好的8m初期支护也随之开裂下沉。文章分析了马头门开裂的原因,介绍了施工中采取的应急措施。

Settlement and crack are found during the construction of the connection of mnning tunnel to a newly built shaft. The settlement and crack formed by bottom bench excavation and crack of primary support ot up -bench is also found since the surrounding rock is very weak and abundant in water contained. The counter measure adopted is presented herewith.