摘要
盾构法作为地铁隧道施工的一种主要施工方法已在我国得到广泛的应用,由盾构施工引起的地层移动和地表沉降是盾构施工中备受关注的问题。以哈尔滨市轨道交通2号线一期工程人民广场站-中央大街站区间隧道施工为依托,通过对隧道上方地表沉降数据进行归纳分析,研究富水砂层地质条件下盾构掘进前后的地表沉降规律。监测结果表明:富水砂层盾构施工时,盾构机到达监测断面前地表沉降量较小,盾构通过监测断面时沉降量较大、盾尾脱出监测断面时沉降量最大,脱出盾尾后逐渐趋于稳定;在盾构中线两侧地表主要影响范围基本呈对称分布,主要影响范围比规范确定的范围略大。
As a mainstream method of subway tunnel construction,the shield construction has been widely used in China.The ground movement and surface settlement caused by the shield construction are issues of concern in shield construction.Based on the construction of the tunnel between People's Square Station and Zhongyang Street Station in the first phase of Harbin Rail Transit Line 2,the surface settlement law before and after shield tunneling under the geological conditions of the water-rich sand layer is studied by summarizing and analyzing the surface settlement data above the tunnel.The monitoring results show that during the construction of the shield tunneling in the water-rich sand layer,the surface settlement is small before the shield tunneling machine reaches the monitoring section;when the shield passes through the monitoring section,the settlement is large,and the settlement is the largest when the shield tail pulls away from the monitoring section.Afterwards,it gradually stabilized;the main influence areas on the ground on both sides of the shield centerline are basically symmetrically distributed,and the main influence areas are slightly larger than those determined by the specifications.
作者
杨玉龙
汪林
辛伟强
YANG Yulong;WANG Lin;XIN Weiqiang(Powerchina Northwest Engineering Corporation Limited,Xi'an 710065,China)
出处
《西北水电》
2020年第S02期63-67,共5页
Northwest Hydropower
关键词
富水砂层
盾构
地表沉降
规律
water-rich sand layer
shield tunneling
surface settlement
law
