Abstract
This study aims to investigate the deformation characteristics under variable stiffness for the propelling mechanism of Earth pressure balance shield machines in mixed ground. In terms of hyperstatic compatibility, a mechanical model for the driving mechanism in composite strata is first constructed. Based on the method of regarding spatial deformation difference as measuring effect on rectifying deviation in thrust system, the deforming difference trunk for the propelling mechanism is subsequently discovered in mixed face ground. Applying deformation difference trunk to the thrust mechanism of a tunneling machine in engineering applications, the characteristics of deformation in thrust mechanism that affect the thrust system correction are finally discussed. Results could provide a theoretical foundation and support for the design of a new pushing mechanism in tunneling machines.
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