围压条件下TBM边缘滚刀破岩模式  

Cutting rock modes of TBM gauge cutters under confining pressures

作　　者：薛亚东[1,2] 杨文亮 黄宏伟[1,2] 张学强 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]上海市城市建设设计研究总院(集团)有限公司,上海200125 [4]山东天工岩土工程设备有限公司,聊城252000

出　　处：《东南大学学报（自然科学版）》2017年第6期1239-1247,共9页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(41072206);中央高校基本科研业务费专项资金资助项目(0200219209)

摘　　要：为了解边缘滚刀的破岩特性,对其破岩过程与机理开展了系统研究.建立了某深埋全断面岩石隧道掘进机(TBM)开挖隧道三维有限元模型,在掌子面过渡圆弧周边设置边缘滚刀破岩模型边界,导出边界上的围压数值并施加在颗粒流模型边界上.模型考虑5种围压模式,相位角为0°,30°,60°,90°时的岩石应力状态分别记为模式1~模式4,无围压状态记为模式5.结果表明:围压模式1中岩石双向应力和、双向应力比均最大,破岩比能最低;模式3中,岩石受到滚刀水平向力作用而近似处于双向等值应力状态,破岩比能最高;从模式1到模式3,有利破岩的竖向应力递减;从模式5到模式3,不利破岩的水平应力增加,导致模式3条件下刀具破岩效率最低;有围压模式的侧向力系数和滚刀切入率均高于无围压模式.To acknowledge the rock breaking characteristics of the gauge cutters,systematic research on their rock breaking process and mechanism was carried out.A 3 D finite element model of a deepburied full-face rock tunnel boring machine(TBM) was established and calculated to obtain the geostress distribution of gauge cutter working area.Then,the corresponding pressure was applied on the particle flow code models boundaries.Five confining pressure models were considered.The rock stress states at phase angles 0°,30°,60°,and 90° were denoted as mode 1 to mode 4,and no confined pressure was denoted as mode 5.The numerical simulation results show that the sum of biaxial stress and its ratio of mode 1 are the largest among all modes.The specific energy of mode 1 is the lowest.In mode 3,the rock is subjected to the horizontal force of the cutters and is approximately in the bidirectional equivalent stress state.It has the highest specific energy.From mode 1 to mode 3,the vertical stress,which can promote rock fragmentation,is decreasing;from mode 5 to mode 3,the horizontal stress,which can suppress rock fragmentation,is increasing.Thus,the cutting efficiency of model 3 is the lowest.The results also show that the side force coefficients and cutting rates of cutters in the confining pressure modes are higher than those in the none-confining pressure mode.

关 键 词：TBM 边缘滚刀 围压 破岩模式 

分 类 号：U452[建筑科学—桥梁与隧道工程]