文献类型：期刊文献

中文题名：内置等强缩尺3D打印支护系统的矿山相似物理模拟试验研究

英文题名：Investigation on mine physical simulation model embedded with iso-strength scaled 3D printed support system

作者：冯晓巍[1];汪明坤[1];薛飞[2];赵同阳[3];宋万新[4];魏群[5];朱毅超[2]

机构：[1]中国矿业大学矿业工程学院,江苏徐州221116;[2]绍兴文理学院土木工程学院,浙江绍兴312000;[3]山东科技大学能源与矿业工程学院,山东青岛266590;[4]中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州221116;[5]江苏理工学院机械工程学院,江苏常州213001

年份：2022

卷号：51

期号：2

起止页码：232

中文期刊名：中国矿业大学学报

外文期刊名：Journal of China University of Mining & Technology

收录：CSTPCD、、CSCD2021_2022、EI(收录号：20221411924900)、Scopus、北大核心、CSCD、北大核心2020

基金：国家自然科学基金项目(51804296);中国博士后科学基金特别资助项目(2019T120480);浙江省自然科学基金项目(LQ20E080006)。

语种：中文

中文关键词：相似物理试验;3D打印;支护系统;失效特征;数字散斑

外文关键词：physical simulation test;3D printing;support system;failure characteristics;digital image correlation

中文摘要：相似模拟试验方法是矿山工程研究中一种重要的研究手段,它在解析岩层移动、矿山压力、多场耦合等方面具有明显优势.为进一步优化这种试验方法,本文利用3D打印技术制作缩尺支护构件并将其植入相似物理模型,整套模拟系统按照30∶1的比例以工程模型为原型进行缩尺,其中煤岩层和支护系统均遵照等强原则进行还原.缩尺煤岩层采用混凝土材料制备,缩尺支护系统采用不锈钢粉末3D打印制作成型;同时,本文设计加工了能够将相似物理模型适用于MTS伺服压力试验机的高强加载框架.测试中,通过声发射、数字散斑以及全程录像分析模型的微观破坏机理、位移场变化过程以及模型失效特征.测试结果表明:巷道周边关键测点位移变化、巷道和支护系统变形失效特征以及整体岩层变形破坏分区与真实情形高度吻合,符合矿山压力作用下的岩层变形规律.此外,声发射特征表明模型在多次受载过程中表现出凯瑟效应.本研究认为采用内置等强缩尺的3D打印支护系统具有极好的适应性,可提高测试精度,对于提升相似物理模拟研究水平具有参考价值和现实意义.

外文摘要：Physical simulation test method is a vital tool in mining engineering research area,it plays a key role in resolving problems like strata movement,mining pressure,multiple fields coupling,etc.In order to further optimize this testing method,this study manufactured 3D printed scaled support components and they were then installed in a mine physical simulation model,the whole system was scaled based on a real engineering model following a ratio of 30∶1,the strata and the support system were prepared based on equal strength criterion.The strata was prepared by concrete and the support system was manufactured by 3D printing of stainless steel powder.At the same time,a high-strength loading frame was designed and manufactured for the loading test of simulation model by MTS servo testing machine.During the test,the microscopic failure mechanism,the displacement filed changing pattern,and the breakage characteristics of the model were obtained by acoustic emission method,DIC method,and real-time video,respectively.Testing results indicated that displacement changing law nearby the entry,failure characteristics of entry and support system,and overall strata breakage zones division could be very alike with the real situations,and they were in line with the strata movement law under mining-induced pressure impacts.In addiction,acoustic emission characteristic demonstrated that the Kaiser effect could be noticed when the model experienced multiple loadings.This study believed that the equal strength and scaled 3D printed support system could have a favorable adaptability to the simulation model and could improve the testing precision,this study provided reference value and practical significance for improving the research level of physical simulation test.