小净距盾构隧道侧穿地铁车站对地表沉降及刀把段结构侧墙变形的影响OACSTPCD

In order to study the influence of the structure of shank handle section of a small distance shield tunnel passing through a subway station on surface settlement and side wall deformation,the Yun-Huan section project of Changsha Metro Line 7 is taken as the study object.The continuous monitoring is carried out on the surface settlement and side wall displacement caused by shield construction,and the finite element software is used to analyze the deformation and stress characteristics of the side wall under the condition of sleeve valve pipe grouting reinforcement for studying the deformation law of the surface and side wall under different ground loss ratio and the stress law of the side wall under different side wall thickness conditions.The results show that,(a)the sleeve valve pipe grouting reinforcement can effectively reduce the deformation and stress of the side walls caused by shield tunneling construction;(b)the surface settlement and side wall displacement show an increasing trend with the increase of ground loss ratio;and(c)when the thickness of the side wall is set to 800 mm,the tensile stress on the side wall can be controlled within the standard value of C40 concrete tensile strength.