摘要
掘锚一体化施工是煤层巷道智能高效掘进的发展方向,滚筒截割参数是感知煤体性质变化的第一手数据,掌握其与煤体力学性质的关联规律是实现掘进智能感知的理论基础。抗拉各向异性是煤体的典型力学特征,对破岩与支护工艺设计有显著影响。采用颗粒离散元法,通过“等效夹层”结构实现煤体模型的抗拉各向异性;耦合滚筒与煤体模型,实现滚筒截割方向上煤体抗拉各向异性的可控调节。通过5组不同截割角度的动态截割试验,分析滚筒扭矩与截割阻力信号的变化特征,得出煤体抗拉各向异性对掘锚机截割参数的影响规律。具体结论如下:①滚筒截割下拉方向与最小抗拉强度加载方向之间夹角减小过程中,滚筒扭矩呈现增大趋势,扭矩波动性逐渐被抑制,波动幅度从6209 N·m降低至5491 N·m;②截割阻力信号反映出煤体“压密”与滚筒降速现象呈现此消彼长态势,煤体呈现“整体扰动—扰动消散—局部破坏”3个阶段;③滚筒截割下拉方向与煤体最小抗拉强度加载方向重合度越高,煤体对截割的响应振动越大,局部破坏效应越强烈。
Integrated excavation and bolting construction represents the developmental direction for intelligent and efficient tunneling in coal seam roadways.Drum cutting parameters serve as first-hand data for perceiving changes in coal mass properties,and understanding their correlation with the mechanical properties of coal is the theoretical foundation for achieving intelligent perception during tunneling.Tensile anisotropy,a typical mechanical characteristic of coal,significantly impacts rock breaking and support design.With the aid of the particle discrete element method,tensile anisotropy in coal models was achieved through an"equivalent interlayer"structure.Meanwhile,controllable adjustment of coal tensile anisotropy along the drum cutting direction was realized by coupling the drum and coal models.On this basis,five sets of dynamic cutting experiments were performed to analyze the variation characteristics of drum torque and cutting resistance signals during the cutting process and ultimately reveal the influence of coal tensile anisotropy on cutting parameters of roadheaders-bolters.The following beneficial conclusions were drawn.As the angle between the downward cutting direction of the drum and the loading direction of the minimum tensile strength narrows,drum torque increases while torque fluctuation is gradually suppressed,with the amplitude decreasing from 6,209 N·m to 5,491 N·m.The cutting resistance signals reflect a seesaw relationship between coal"compaction"and drum deceleration phenomena,and coal exhibits three distinct stages:"overall disturbance→disturbance dissipation→localized failure".Higher alignment between the downward cutting direction of the drum and the loading direction of the minimum tensile strength results in stronger vibration response of coal to cutting and more intense localized failure effects.
作者
杨森
许嘉伟
郭玙博
韩江伟
马军强
YANG Sen;XU Jiawei;GUO Yubo;HAN Jiangwei;MA Junqiang(College of Energy and Mining Engineering,Xi'an University of Science and Technology,Xi'an 710054,China;Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education,Xi'an 710054,China)
出处
《采矿与岩层控制工程学报》
北大核心
2026年第1期161-175,共15页
Journal of Mining and Strata Control Engineering
基金
国家自然科学基金资助项目(52474180,52004204)
中国博士后科学基金面上资助项目(2022MD723829)
西安科技大学优青资助项目(2022YQ3-08)。
关键词
掘锚一体机
抗拉各向异性
滚筒截割参数
煤层巷道掘进
roadheader-bolter
tensile anisotropy
drum cutting parameter
coal seam roadway excavation
