摘要
本文依托成都地铁17号线黄石站—市五医院站盾构区间工程实例,对隧道施工过程中碴土改良后地表沉降进行监测,同时应用FLAC3D三维数值软件模拟了砂卵石地层碴土改良施工过程,给出了地表纵、横向变形规律,继而研究了不同土舱压力下的地表变形曲线。结果表明:实测数据与数值模拟结果基本吻合;地表变形随土舱压力升高呈线性增加,根据拟合直线可推测出地表在不同土舱压力条件下的变形值;对于碴土改良后的砂卵石地层盾构隧道施工的土舱压力在0.19~0.22 MPa范围内能保证地表沉降满足控制指标的要求,从而为卵漂石地层盾构施工提供参考依据。
Based on the shield running tunnel between Huangshi station and No.5 Hospital sation of Chengdu Metro Line 17,it monitored the ground settlement after the improvement of soil during tunnel construction.Meanwhile,FLAC3 D three-dimensional numerical software was used to simulate the construction process of the improvement of soil in sandy gravel stratum,and the laws of vertical and lateral deformation of the ground surface were revealed.On this basis,the surface deformation curves under different soil chamber pressures were studied.The results show that the measured data are generally consistent with the numerical results;the surface deformation increases linearly with the rise of earth chamber pressure,and the surface deformation under different earth chamber pressures can be inferred from the fitting straight line;the earth chamber pressure for shield tunnel construction in sandy gravel stratum after improvement of soil is within the range of 0.19 to 0.22 MPa,by which the surface settlement can meet the requirements in terms of control index,thus providing a reference for shield construction in a pebble-boulder stratum.
作者
周杰
朱贤宇
唐健
ZHOU Jie;ZHU Xianyu;TANG Jian(Nanjing Branch of China Communications Third Navigation Engineering Bureau Co.,Ltd Nanjing 210009)
出处
《现代隧道技术》
EI
CSCD
北大核心
2019年第S02期374-378,共5页
Modern Tunnelling Technology
关键词
地铁
盾构隧道
碴土改良
土舱压力
沉降
Subway
Shield tunnel
Soil improvement
Soil chamber pressure
Settlement
