摘要
以长春地铁车站出入口通道暗挖穿越既有快速路为工程背景,研究了软弱粉质粘土层不均匀降水因素对既有结构的影响情况。采用粘聚力参数折减来近似拟合降水施工对暗挖所在地层的影响,根据实测沉降,建立了折减系数的反算格式。该方法简便易行,避开了现场孔隙压力测定,其沉降结果与实测结果一致,反算出的折减系数可用于同类工程中。根据反算结果,分析了暗挖施工对既有建筑物的安全性影响。
The influence of uneven dewatering in the weak silty clay stratum on the existing structure is analyzed on the basis of the subway station project in Changchun,of which the entrance channel excavation is under the existing freeway.The effect of the existed pore pressure is summed up as the cohesion decreases with the reduction factor,and the back-calculation method is established according to the settlement of monitoring results.The back-calculation method is simple and convenient when the detailed pore pressure is hard to determine.The calculated settlement is consistent with the monitoring data,so that the back-calculated reduction factor can be used in similar projects.Additionally,the safety of the existing structure under the beneath excavation of subway is analyzed according to the results of back-calculation.
出处
《交通科学与工程》
2015年第1期64-68,共5页
Journal of Transport Science and Engineering
关键词
地铁
暗挖下穿
折减系数
稳定性
subway
beneath excavation
reduction factor
stability
