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THE ANALYSIS OF DISCHARGING AMOUNT OF EARTH IN EPB SHIELD TUNNELING

Xue Rujing Chen Dong(School of Mechanics and Civil Engineering,CUMT Beijing 100083)Wu Jingshu(Central Research Institute of Building and Construction,MCC group Beijing 100088)  
Based on the Incompact character of the earth,this paper brings forward and calculates the limit discharging amount of earth in EPB.Then a balance condition which reflects the relation among the parameters of EPB was given.Finally,the authors extended the concept of the earth balance principle.Which provides a theoretical basis for the control of the discharging amount of earth in EPB shield tunneling.
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