树根桩技术在铁路隧道中的应用

1树根桩概述树根桩是指桩径在70～250mm、长径比大于30、采用螺旋钻成孔、强配筋和压力注浆工艺成桩的钢筋混凝土就地灌注桩,又称为小直径钻孔灌注桩,布桩可以采用竖向、斜向设置,网状布置如树根状,故称为树根桩。树根桩是由意大利Fondedile公司在20世纪30年代发明的一项专利技

Application of root pile construction technique in railway tunnels

When the foundation base of a tunnel lies in soft layers, the bearing capacity of the base is hard to meet the requirements of the structural force. To ensure the stability of the tunnel structure, foundation base strengthening design is most important to increase the bearing capacity of the same. In case a single track tunnel is of poor surrounding rock and of a larger scope for foundation treatment, the root pile construction technique, if used, can minimize the disturbance to the strata of the tunnel barrel in narrow and much limited construction space. This article introduces the instance of root piles which are successfully applied to the tunnels of Line 2 of Shen-Shuo railway, which can provide reference to future similar works.