摘要
文章以杭州某人行地道工程为例,介绍了在繁华城区饱和软土地层条件下,采用浅埋暗挖法施工地下通道的若干关键技术。在掌子面超前预加固方面,TSS工法具有注浆压力易控制,浆脉分布均匀的特点,同时注浆管对土体存在加筋效应;在开挖工法方面,采用CRD六部开挖,宜先中间后两侧,预留核心土长度应结合土体注浆预加固和锁脚锚管控制侧墙变形效果加以综合确定;在临时支撑拆除风险控制方面,可通过加密纵向连接筋和设置全断面径向小导管来提高结构刚度和土体强度,并控制地层沉降。
Taking an underpass project in Hangzhou as an example, this paper introduces some key techniques for an urban underpass in saturated soft soil constructed by the shallow mining method. For the pre-reinforcement ahead of the tunnel face, the TSS method is characterized by controllable grouting pressure, uniform grout distribution and the reinforcement effeet of grouting pipes. For the excavation method, the CRD method with six excavation portions should be adopted for the first excavation of the middle part and then for excavation of the two side parts, but the length of the reserved core soil must be determined considering the effeets of the pre-grouting reinforcement and the controlling effects of the foot-locking anchor against side wall deformation. For reducing the risk of removing the temporary support, the longitudinal connection reinforcements should he enhanced and small pipes should be installed in full-face to improve structure rigidity and soil strength, as well as to control ground settlement.
出处
《现代隧道技术》
EI
CSCD
北大核心
2017年第3期195-199,206,共6页
Modern Tunnelling Technology
关键词
饱和软土地层
浅埋暗挖法
TSS注浆预加固
CRD六部开挖工法
临时支撑拆除
Saturated soft soil
Shallow mining method
Pre-grouting reinforcement with TSS
CRD method with six excavation portions
Removal of the temporary support
