砂质粉土地区盾构施工引起的地面沉降研究  

Study on Surface Settlement due to Tunnel Construction with Shield in Sandy Silt Area

作　　者：魏纲[1] 杨泽飞[1] 林磊磊[1] 

机构地区：[1]浙江大学城市学院土木工程系,杭州310015

出　　处：《武汉理工大学学报》2012年第12期93-96,共4页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(51078332);浙江省自然科学基金(Z1100016);浙江省教育厅项目(Y201122550)

摘　　要：杭州地铁2号线某盾构区间土质主要为砂质粉土,盾构施工过程中出现了地面日沉降速率连续报警和地面沉降量过大问题。对地面沉降实测数据进行了统计分析与理论研究。结果表明:由于该地区以砂质粉土为主,渗透系数较大,导致固结沉降在盾尾通过后1周内完成;地面沉降在盾尾通过后迅速稳定,变化时间非常短(总共3～4d);由于工后固结沉降完成时间很短,一旦施工沉降较大,就容易造成日沉降速率和地面沉降量超标;引起的固结沉降量总体较小,平均值为9.7mm,但最大地面沉降值的分布范围很广,表明盾构施工水平对地面沉降的影响非常大。The problem of excessive ground settlement and continuous alarm of daily ground settlement rate appeared in one shield zone of Hangzhou subway line 2 during the shield construction process,where is mainly distributed of sandy silt soil.Under the statistical analysis and theoretical research of measured data of ground settlement,the result shows that the consolidation settlement completed within one week after the passage of the shield tail due to the relatively big permeability coefficient in the region of mainly sandy silt;the ground settlement becomes stable soon after the passage of the shield tail within a very short time（totally 3~4 days）;due to the post-construction consolidation settlement completes very fast,the excess of ground settlement and daily ground settlement rate can be easily caused once the construction settlement is large;the overall amount of consolidation settlement is small,and its average value is 9.7 mm,but the distribution of the maximum ground settlement is very wide,indicating that the level of shield construction has a big influence on ground settlement.

关 键 词：盾构 地面沉降 固结沉降 固结度 

分 类 号：TU433[建筑科学—岩土工程]