In the adjacent underground cable tunnel construction process,the surrounding soil is disturbed,and the soil stress redistribution leads to the displacement of the cable tunnel and deformation of the struc-ture.In order to study the disturbance law of shield tunnel crossing on cable tunnel,a large number of nu-merical simulations are carried out from three aspects:spatial position relationship between shield tunnel and cable tunnel,clear distance and cross-sectional size of cable tunnel,and the force and deformation curves under different working conditions.On this basis,the annular and longitudinal safety factors of cable tunnels are checked,and the relationship curve between secondary lining and the minimum safety factor of the structure is obtained with the change of spacing,so as to propose the construction safety protection dis-tance under two working conditions.The main conclusions are:(1)The vertical displacement and longitudi-nal tensile stress of the cable tunnel increase with the decrease of the spacing,and with the expansion of the cross-section size,the longitudinal tensile stress of the cable tunnel expands accordingly,and the resulting settlement value decreases.(2)The minimum safety factor of the secondary lining structure decreases with the decrease of the spacing and decreases with the expansion of the cross-section size.(3)Under the same conditions,the safety protection distance of diagonal 45° side penetration is less than that under the vertical underpass condition,and the safety is higher.
关键词
盾构隧道下穿/数值模拟/结构最小安全系数/安全保护距离
Key words
Shield tunnel underpassing/Numerical simulation/Minimum safety factor of structure/Safe protection distance
维普
万方数据