基于UDEC的隧道掘进机滚刀破岩数值模拟研究  

Research on numerical simulation of rock breaking using TBM disc cutters based on UDEC method

作　　者：莫振泽[1] 李海波[1] 周青春[1] 何恩光 邹飞[1] 朱小明[1] 赵羽 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室,武汉430071 [2]北方重工集团全断面掘进机国家重点实验室,沈阳110141

出　　处：《岩土力学》2012年第4期1196-1202,1209,共8页Rock and Soil Mechanics

基　　金：国家杰出青年基金(No.51025935);国家973计划项目(No.2010CB732001);国家科技支撑计划项目(No.2007BAF09B01);国家科技支撑计划项目(No.2006BAB04A06)

摘　　要：现今全断面隧道掘进机(TBM)施工方法在长大深埋隧道工程中已被广泛采用,对滚刀破岩关键技术的进一步认识具有重要的工程价值。为了研究滚刀破岩机制,分析刀圈断面形态、岩石强度和节理角度对其的影响,运用UDEC方法建立了滚刀贯切岩石的二维数值系列模型,对TBM滚刀破岩过程进行了仿真。分析表明:滚刀破岩是滚刀下岩石拉破坏和剪破坏的综合反映,拉破坏是裂纹萌生与扩展的主要驱动机制;刃宽较大的平刀与刃角较大的楔刀破岩效果较好;平刀与楔刀在软岩中破岩效果相近,平刀在硬岩施工中比楔刀的破岩效果好;滚刀对节理角度为30°～60°的岩石破坏效果较好,由于楔刀的"劈裂"作用,楔刀比平刀更适合用于贯切含有节理的岩石。The fullface tunnel boring machine （TBM） has been widely used in projects nowadays; it is significant to understand the key technology of rock breaking by TBM disc cutters. In order to study the rock breaking mechanism and consider the effect of disc cutter rings＇ crosssection shape, rock strength and joint orientation, we build a series of twodimensional numerical models of rock broken by disc cutlers using UDEC method and simulate the process of rock fragmentation by TBM disc cutters. The case study and comparative analysis show that rock breaking mechanism is a composition of shear failure and tensile failure; tensile failure is the main reason for crack initiation and propagation. From the numerical results, it is also shown that wider flat cutters and blunter wedge cutters are good at breaking rock; and flat cutters is better than wedge cutters to break hard rocks, while they are same in soft rocks; and disc cutter is good at breaking the jointed rocks which have a joint angle between thirty degrees and sixty degrees; wedge cutter is better than flat cutter to penetrate jointed rocks due to its splitting effect.

关 键 词：隧道掘进机 滚刀 破岩机制 UDEC 数值仿真 

分 类 号：TU731.3[建筑科学—建筑技术科学]