0 Introduction Screw conveyor is one of the important components of earth pressure balance shield earthing system. In the shield construction, the screw conveyor not only has the function of excluding the muck in the excavation chamber, but more importantly, it has the function of controlling the bottom pressure of the screw conveyor, thereby maintaining the earth pressure balance of the shield excavation surface. The geometry, angle and nature of the screw conveyor are important factors in balancing the pressure at the bottom of the screw conveyor. The author has simplified the mechanics of the screw conveyor, and used the principle of earth pressure balance to derive the formula for calculating the bottom pressure of the screw conveyor, and then analyzed the relationship between the bottom pressure of the screw conveyor and the parameters of the conveyor. 111. Normally, The earth pressure balance shield can meet the construction requirements with a screw conveyor. However, in some areas where the geological conditions are relatively complicated and the soil and water pressure in the formation is relatively high, a screw conveyor cannot balance the pressure in the cabin, and the double-section tandem screw conveyor is used to balance the earth pressure. Based on the basic principle of earth pressure balance, this paper derives the calculation formula of the bottom pressure of the double-section series screw conveyor.
1 The principle of earth pressure balance is that the soil cut by the cutter head enters the earthen cabin and becomes a fluid-like soil after being “improvedâ€. The flow-molded soil is filled with a sealed earth chamber and a screw conveyor housing to form a certain pressure to balance the water and earth pressure on the excavation surface. As shown, 1 is the water pressure at the excavation face, 2 is the earth pressure at the excavation face, and 3 is the earth pressure in the earth chamber. Earth pressure balance is to maintain the deputy director of the wood department, associate professor, mainly engaged in urban subway, tunnel engineering, shield / TBM engineering research and teaching work u1 + 2 = 3. The screw conveyor acts to control the earth pressure at the bottom.
Basic principle of earth pressure balance 2 mechanical model of double-section tandem screw conveyor
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