METHOD FOR CALCULATING TOTAL THRUST OF COMPOSITE SHIELD DURING TUNNELING IN SOIL AND ROCK MIXED GEOLOGY

摘要

Provided is a method for calculating total thrust of a composite earth pressure balance shield during tunneling in soil and rock mixed geology. The method comprises: calculating various component forces of a composite earth pressure balance shield during tunneling: a rock breaking force of a hob on a cutter head, a tunneling extrusion force of a contact segment of a cutter head panel with a soft soil layer, an earth pressure at rest, caused by the covering soil buried depth, of the contact segment of the cutter head panel with the soft soil layer, a sealed cabin pressure of an opening segment of the cutter head, the frictional resistance between a shield and soft soil, the frictional resistance between the shield and rock, and traction of a subsequent apparatus; and then calculating total thrust during tunneling according to the various calculated component forces. Total thrust of the composite earth pressure balance shield during tunneling in soil and rock mixed geology is calculated rapidly and accurately by the method. Thrust parameters can be flexibly adjusted at any time according to changes in the geological conditions and the tunneling speed, thus providing a reliable data basis for the design of a power system of a composite earth pressure balance shield device and for setting and real-time adjustment of the thrust parameters during construction.