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土压平衡盾构在我国的地铁建设中,起着越来越重要的作用,由于其作业环境和作业对象的复杂性,对作业过程中的许多技术参数要进行认真研究,其中土压平衡盾构掘进过程中的总推力就是需要进一步研究的主要参数之一。土压平衡盾构总推力的数学模型对土压平衡盾构的设计、选型以及控制方法的选择有重要的指导意义。建立了土压平衡盾构掘进过程中总推力的数学模型,并分析了诸如刀盘开口率、盾构与土体接触长度、盾构壳体与周围土体之间的摩擦系数以及土舱压力等参数对盾构总推力的影响。所建立的数学模型在以1800mm盾构和一个长8.6m的模拟土箱组成的模拟盾构试验台上进行了掘进试验验证。结果表明,实际总推力与根据所建立的数学模型得出的计算值基本相符;总推力与土舱压力,盾构与土体接触长度等关系密切,尤其是土舱压力的平衡与否对总推力的影响作用十分明显。
Earth pressure balance shield plays more and more important role in China’s subway construction. Due to the complexity of its working environment and operation object, many technical parameters in the operation process should be carefully studied. Among them, the earth pressure balance shield The total thrust in the process of excavation is one of the main parameters that need further study. The mathematical model of the total thrust of the earth pressure balance shield has an important guiding significance for the design, selection and control method selection of the earth pressure balance shield. The mathematical model of the total thrust force during the excavation process of the earth pressure balance shield was established and analyzed such as the cutter opening ratio, the contact length between the shield and the soil, the friction coefficient between the shield shell and the surrounding soil, Influence of Equal Parameters on Total Thrust of Shield. The established mathematical model was verified by tunneling test on a simulated shield test rig consisting of a 1800mm shield and a simulated 8.6m long soil box. The results show that the actual total thrust basically accords with the calculated value based on the established mathematical model. The total thrust is closely related to the pressure in the soil tank and the contact length between the shield and the soil. Especially the balance of the earth pressure does not affect the total The effect of thrust is very obvious.