地铁同区间不同冻结联络通道变形对比

为探究同一区间下不同地铁联络通道在冻结及开挖过程中对盾构隧道、地表位移变形的影响规律,以穗莞深城际SZH-9标机场北站-机场站盾构区间的3个联络通道为工程背景,通过对现场盾构隧道拱顶、拱底、净收敛及地表位移监测分析,获得结果:盾构隧道净收敛在联络通道冻结和开挖时期扩张,而开挖准备和注浆阶段收敛值变小,其变化曲线近呈“M”型;受应力传递及释放影响,拱底、拱顶在注浆阶段前的竖向变形随施工工况逐渐增加,注浆阶段位移则变小,并且拱底受外界改变而发生的波动较大;联络通道施工中采取融沉注浆对于地表变形的稳定具有明显效果,并且能够对变形进行补偿,使地表得到一定程度上的恢复。

Comparison of deformation of different frozen connection channels in the same section of subway

In order to study the influence of different subway connecting passages in the same section on the displacement and deformation of shield tunnel and ground surface during freezing and excavation,based on the engineering background of three connecting passageways between Szh-9-bid airport North Station and airport station shield tunnel,this paper analyzes the arch top,the arch bottom,the net convergence and the surface displacement of the shield tunnel,the results show that the net convergence of shield tunnel expands during the freezing and excavation of the connecting passage,while the convergence value decreases in the preparation and grouting stages,and the change curve is nearly"m"shape,which is influenced by the stress transfer and release,the vertical deformation of the arch bottom and the vault increases gradually with the construction condition,but the displacement of the arch bottom decreases in the construction of the connecting passage,the settlement grouting has obvious effect on the stability of the surface deformation,and can compensate the deformation,so that the surface can be restored to a certain extent.