基于离散元的镶齿滚刀破岩机理研究  

Research on Inserted-tooth Roller Cutter Rock Breaking Mechanism Based on Discrete Element Method

作　　者：周平 ZHOU Ping(Xiamen Shenzhen Railway Guangdong Co.,Ltd.,Shenzhen,Guangdong 518000,China)

机构地区：[1]厦深铁路广东有限公司,广东深圳518000

出　　处：《施工技术（中英文）》2024年第21期96-102,共7页Construction Technology

基　　金：国家自然科学基金(52378418)。

摘　　要：镶齿滚刀作为广泛应用于竖井掘进设备的破岩钻进刀具,其破岩方式与破岩效率影响竖井掘进设备性能,需对球齿破岩机理进行研究。采用二维离散元程序建立尽可能接近真实物理力学性能的岩石离散元模型,经过合理简化刀具破岩运动形式,模拟镶齿滚刀多个球齿破岩过程。从微观角度分析球齿破岩时岩石微裂纹萌生、扩展和破碎过程,探究球齿破岩机理。通过设置多组不同齿间距和贯入度下的仿真试验,研究刀具所需破岩荷载变化规律。采用平行黏结破坏产生微裂纹的能力评价球齿破岩比能耗,研究齿间距和贯入度对球齿破岩比能耗的影响,并得到较低球齿破岩比能耗下的参数合理取值。Inserted-tooth roller cutter is widely used as a rock breaking drilling tool in vertical shaft excavation equipment,the rock breaking method and efficiency of the inserted-tooth roller cutter affect the performance of the vertical shaft excavation equipment,and the spherical teeth rock breaking mechanism needs to be studied.A two-dimensional discrete element program is used to establish a rock discrete element model that is as close as possible to the real physical and mechanical properties.After reasonably simplifying the cutting tool rock breaking motion form,the rock breaking process of multiple spherical teeth of the inserted-tooth roller cutter is simulated.The initiation,propagation and crushing process of rock microcracks during spherical teeth rock breaking are analyzed from a microscopic point of view,and explore the mechanism of spherical teeth rock breaking.By setting up multiple simulation experiments with different tooth spacing and penetration,the variation law of rock breaking load required for cutting tools is studied.The ability to generate microcracks through parallel bonding failure is used to evaluate the specific energy consumption of spherical teeth rock breaking.The influence of tooth spacing and penetration on the specific energy consumption of spherical teeth rock breaking is studied,and reasonable parameter values are obtained for lower specific energy consumption of spherical teeth rock breaking.

关 键 词：竖井 滚刀 球齿 离散元 裂纹 齿间距 贯入度 比能耗 

分 类 号：U455.8[建筑科学—桥梁与隧道工程]