土压平衡盾构施工的顶进推力模型试验研究

在盾构的掘削过程中，千斤顶顶进推力是一个重要的施工参数，它不仅决定着施工速度，而且还影响着刀盘的切削扭矩、转动速度等其他参量。但是，目前对千斤顶顶进推力的变化规律，尤其是土体与盾壳之间摩擦阻力的研究还不够深入。以上海地区粉砂地层为参照原型，借助于模型试验方法，通过对盾构机工作参数和地层特性参数进行不同的组合试验，研究了土压平衡盾构推进过程中顶进推力变化的规律，以及土体与盾壳之间摩擦作用的机理及其影响因素。在此基础上推导了盾构千斤顶顶进推力的计算公式。

Experimental study on thrust force during tunnel excavation with earth pressure balance shield machine

Thrust force is an important construction parameter during tunnel excavation with shield machine.It not only determines the advance rate but also influences other working parameters,such as cutter torque and rotation speed,etc.But so far,the research on thrust force,especially on frictional force between soil and shield tube,still does not go into enough depth.Therefore,a special model test scheme on tunnel excavation with earth pressure balance(EPB) shield machine is designed by the authors;while the silt sandy ground in Shanghai area is taken as prototype,then different parameters of shield machine and ground properties can be combined for testing.Based on the test results,studies are carried out to discover the variation law of thrust force,the mechanism of friction between soil and shield tube and its influence factors.Furthermore,a calculation formula of thrust force is deduced.