Analysis of Plane Attitude Control of Shield Tunneling Machine in Small Radius Curve Section

It is difficult to control the plane posture of shield tunneling machines during construction on small radius curved sections. In actual construction, construction person mainly determine the main parameters based on experience, and there is currently no relevant theoretical basis. This article analyzes the plane posture of shield tunneling machines and proposes a reasonable plane state for shield tunneling machines, that is, the cutter head of the shield tunneling machine passes through curved sections close to the outer boundary; When obtaining a reasonable plane posture of the shield tunneling machine, the relationship between the inner and outer jack travel of the shield tunneling machine can be obtained. During construction, as long as the pushing amount of the inner jack is controlled, the pushing amount of the outer jack can be obtained; A reasonable calculation method for the maximum over excavation amount of the shield machine under different top pushing amounts in the plane state of the shield machine is obtained; It is proposed to only perform over excavation on the inner side of the curve, without over excavation on both the upper and lower sides, and a calculation method for the extension of the over excavation knife at different angle positions is obtained. The results have laid the theoretical foundation for intelligent control of shield tunneling posture in curved sections.