【摘要】 为了研究盾构在砂卵石地层切削效率的影响因素，依托沈阳地铁9号线朗日街站-浑南大道站区间隧道工程，对先行刀与刮刀组合切削砂卵石地层进行数值模拟分析，研究贯入度、刀盘转速以及刀具高差对组合刀具切削效率的影响。经分析可知：贯入度、刀盘转速和组合刀具高差对切削效率影响显著，对于砂卵石地层，为提高盾构掘进速度可以采用40～50mm/r的贯入度，施工过程中刀盘转速一般应控制在2r/min以下，刀盘组合刀具的高差设计值应在35～50mm之间选取。更多还原

【Abstract】 In order to study the factors affecting cutting efficiency of shield tunneling in sandy cobble formation, relying on the tunnel project of Shenyang Metro Line 9, numerical simulation analysis is carried out on the combination of advance knife and scraper knife for sand cobble formation, the effects of penetration, cutter head speed and tool height difference on cutting efficiency of combined tool were studied. The analysis shows that: penetration degree, cutter head speed and combined tool height difference have significant effects on cutting efficiency. For sandy cobblestone formation, in order to improve the speed of shield tunneling, the penetration degree of 40 ～ 50mm/r can be adopted, in the process of constr uction, the speed of cutter head should be controlled below 2r/min, the height difference design value of the cutter head combination tool should be selected between 35～ 50mm.更多还原