类矩形盾构掘进效能实测分析

FIELD MEASUREMENT AND ANALYSIS OF TUNNELING EFFICIENCY OF QUASI-RECTANGULAR SHIELD

地铁隧道常采用盾构法施工,其中又以圆形盾构为主。为研究类矩形盾构施工过程中掘进参数及效能,依托杭州地铁某类矩形盾构掘进施工案例,对比类似地层条件下小直径圆形盾构,分析两者主要盾构掘进参数的变化规律,并引入掘进效能和掘进比能的概念,根据效能、比能公式,计算得出两者掘进效能和掘进比能。得出类矩形盾构总推力约为小直径圆形盾构的两倍,刀盘扭矩和刀盘转速均小于小直径圆形盾构,且类矩形盾构刀盘扭矩具有较大的波动性,推进速度一般控制在10mm/min;类矩形盾构推进功耗一般在5~10kW之间,单个刀盘切削功耗一般在100~400kW之间;推力推进做功贡献的掘进比能在数值上远小于刀盘驱动做功贡献的掘进比能。

Subway tunnels are often constructed by shield method,among which circular shield is the main method.Taking a rectangular shield tunneling of Hangzhou Metro as the case to study the tunneling parameters and efficien-cy during the construction of rectangular shield.The variation law of the main tunneling parameters of the two kinds of small-diameter circular shields under similar stratum conditions is analyzed,and the concepts of tunneling effi-ciency and tunneling specific energy are introduced.Based on the formulas of efficiency and specific energy,the tun-neling efficiency and tunneling specific energy are calculated.The results show that the total thrust of quasi-rectan-gular shield is about twice that of small-diameter circular shield;the cutter head torque and cutter head speed are less than that of small-diameter circular shield,and the cutter head torque of quasi-rectangular shield has great fluc-tuation.The propulsion speed is generally controlled at 1Omm/min;the propulsion power consumption of rectangu-lar shield is generally 5~10kW,and the cutting power consumption of a single cutter head is generally 100~400kW.The tunneling specific energy contributed by thrust propulsion is much smaller than that contributed by cutter head drive.