基于道路沉降控制的富水软弱地层超浅埋暗挖地铁车站施工方案研究  

Study on Construction Scheme of Metro Station Undercutting with Ultra⁃shallow Overburden in Water⁃rich Weak Stratum Based on Settlement Control of Urban Road

作　　者：董凯 DONG Kai(Beijing Municipal Construction Co.Ltd.,Beijing 100089,China)

机构地区：[1]北京市政建设集团有限责任公司,北京100089

出　　处：《铁道建筑》2021年第6期65-68,共4页Railway Engineering

摘　　要：北京地铁昌平线南延工程小营西路车站为地下暗挖双层车站,位于小营西路下方,车站两侧区间隧道采用盾构法施工。首先分析了小营西路车站工程地质条件和施工面临的问题,基于PBA法设计了4导洞和6导洞两种施工方案。然后从施工降水持续时间、施工安全性、满足盾构先行过站要求等方面对两种方案进行了比选,确定采用4导洞方案。最后采用数值模拟方法分析了4导洞方案施工对道路下方地层沉降的影响,结果表明地层沉降超过控制值。为确保车站上方的道路安全,提出在车站拱部增设大管棚,在横通道与车站主体结构交叉部位预埋门式钢架、加强环等加固措施。The Xiaoying west road station of the south extension project of Beijing Metro Changping line is a double-layer station with undercutting method,which is located under Xiaoying west road.The tunnel on both sides of the station was constructed by shield method.Firstly,the engineering geological conditions and construction problems of Xiaoying west road station were analyzed.Based on PBA(Pile-Beam-Arch)method,two construction schemes of four drifts and six drifts were designed.Then the two schemes were compared and selected from the aspects of construction dewatering duration,construction safety and meeting the requirements of shield passing station first,and the four drifts scheme was determined.Finally,the numerical simulation method was used to analyze the influence of four drifts construction scheme on the ground settlement under the road.The results show that the ground settlement exceeds the control value.In order to ensure the road safety above the station,the reinforcement measures were put forward,such as adding large pipe shed at the arch of the station,embedding portal steel frame and reinforcing ring at the intersection of the cross passage and the main structure of the station.

关 键 词：暗挖地铁车站 施工方案 数值模拟 富水软弱地层 盾构先行过站 地层沉降控制措施 

分 类 号：U455.7[建筑科学—桥梁与隧道工程]