Characteristics and Prediction of Surface Transverse Deformation of Double-line Shield Tunnel in Subway Tunnel
There are many factors affecting the surface deformation of double-line shield tunnel in subway tunnel,so it is necessary to deeply analyze its surface deformation law and effectively carry out deformation prediction research.Based on the measured data of double-line shield tunnel in subway tunnel in Beijing,the effects of tunnel central buried depth and horizontal spacing on ground transverse deformation are studied by numerical simulation method.The relative spacing coefficient of double-line tunnel is defined for the first time,and the prediction formula of surface deformation is established.The results show that:With the increase of tunnel center spacing,the surface settlement groove of double-line tunnel gradually changes from V-type(or U-type)to W-type.The spatial relationship of double-line tunnel is different,and the surface deformation form is also different;The relative spacing coefficients R1 and R2 can be used to describe the change of surface deformation form;The statistical results of formation loss rate Vl and width parameter k are obtained by fitting the engineering measured data,which provides a reference for the value of surface deformation prediction parameters;The verification results of typical engineering cases show that the surface deformation prediction formula of double-line shield tunnel in subway tunnel has good applicability.
NETL
NSTL
万方数据
维普
