锚杆拱形托盘托锚力扩散效应及影响因素分析  

Analysis of diffusion effect and influencing factors of anchoring force of arched rock bolt support plate

作　　者：闫汝瑜 宁建国[1] 张智 孙国庆 杜明浩 YAN Ruyu;NING Jianguo;ZHANG Zhi;SUN Guoqing;DU Minghao(School of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]山东科技大学能源与矿业工程学院,山东青岛266590

出　　处：《煤矿安全》2023年第4期126-131,共6页Safety in Coal Mines

摘　　要：拱形托盘是锚杆支护系统中的关键构件之一,其结构尺寸及强度直接影响锚杆支护效果。采用室内实验和数值模拟相结合的方法,研究分析了锚杆拱形托盘不同受载阶段托锚力在岩体内部的扩散演化规律;利用正交试验理论,分析了托锚力扩散演化对锚杆拱形托盘拱高和圆拱半径的敏感度。研究发现:托锚力经托盘传递至岩体,扩散形成“应力泡”式的次生应力场;若托锚力小于托盘承载强度,次生应力场范围随着托锚力的增加而增大,反之则减少;拱形托盘圆拱半径和拱高等因素对次生应力场范围具有显著性影响,但敏感性主次顺序为圆拱半径>拱高。The arched rock bolt support plate is one of the key components in the rock bolting system,and its structural size and strength directly affect the rock bolting effect.In this paper,using the method of combining indoor experiments and numerical simulation,the diffusion evolution law of anchoring force in the interior of rock mass at different loading stages of arched rock bolt support plate is studied and analyzed,and secondly,the sensitivity of the diffusion evolution of anchoring force diffusion to the arch height and radius of arched rock bolt support plate is analyzed by using orthogonal experiment theory.The study found that:the anchoring force is transmitted to the rock mass through the tray,and the diffusion forms a“stress bubble”type secondary stress field;if the anchoring force is less than the bearing strength of the rock bolt support plate,the secondary stress field range increases with the increase of the anchoring force,and vice versa;factors such as the arch radius and arch height of the arched rock bolt support plate have a significant impact on the secondary stress field range,but the primary and secondary order of sensitivity is the arch radius>the arch height.

关 键 词：数值模拟 拱形托盘 应力扩散 正交试验 敏感度分析 

分 类 号：TD353[矿业工程—矿井建设]