摘要
以西安地铁五号线某区间隧道工程为例,对黄土地区地铁隧道设计中遇到的几个重难点问题进行了分析与探讨,提出了针对性的设计方案和处理措施,保证了隧道的安全顺利实施,得出以下结论供类似工程参考和借鉴:黄土地区地铁隧道设计应以车站及区间使用功能为前提,尽量绕避自重湿陷性黄土,对于隧道基底处理深度小于2 m的,采用洞内换填处理是合理可行的;地质条件较好、周边环境控制要求不高时,可取消隔离桩,并在先行隧道初支贯通后,即可进行后行隧道的施工;区间洞口位置的选择、边仰坡防护措施及洞门设计方案是合理可行的,可保证施工及后期运营安全,同时也满足城市景观的要求;桥隧过渡段采用桩板结构进行设计,可实现刚柔过渡,避免湿陷性黄土的影响,降低工后和差异沉降,满足行车平顺性的要求。
By taking the tunnel project of line five of Xi＇an metro line as an example,several important and difficult problems encountered in the design of the subway tunnel in the loess area are analyzed and discussed. The specific design scheme and treatment measures are proposed to ensure the safe and smooth implementation of the tunnel,and the conclusions are as follows： 1） The design of the subway tunnel in the loess area should take the function of the station and the interval as the premise to avoid the self-weight collapsible loess as far as possible. It is reasonable and feasible to replace the tunnel foundation with the tunnel foundation treatment depth less than 2 m. 2） When the geological condition is good and the control requirements of surrounding environment are not high,the isolation piles is not necessary. After the initial tunnel passes through,the construction of the rear tunnel can be completed.3） The selection of the location of the tunnel entrance,the protection measures of the side slope and the design scheme of the portal are reasonable and feasible,which can guarantee the safety of the construction and the later operation,and also meet the requirements of the city landscape. 4） The bridge and tunnel transition section is designed by the pile plate structure,which can realize the rigid and flexible transition,avoid the influence of collapsible loess,reduce the post and differential settlement,and meet the requirements of ride comfort.
作者
高强
于文龙
GAO Qiang, YU Wenlong(Guangzhou Metro Design and Researeh Institute Co., Ltd., Guangzhou, Guangdong 510010, Chin)
出处
《水利与建筑工程学报》
2018年第3期212-217,共6页
Journal of Water Resources and Architectural Engineering
关键词
区间隧道
湿陷性黄土
小净距隧道
洞口及边仰坡防护
桥隧过渡
running tunnel
collapsible loess
small interval tunnel
protection of hole and side slope
bridge andtunnel transition
