摘要
相似材料模拟试验是探究煤炭开采过程中覆岩破坏、岩层移动及岩层控制的重要手段,然而传统相似模拟材料难以对采动岩层内部损伤破裂及其动态发育过程进行有效监测。为此,将碳纤维引入矿山相似材料模拟实验领域,借助该复合材料电阻率变化对损伤的灵敏反馈,实现了相似模拟实验中采动岩层内部损伤与破裂规律的实时监测,并据此研发了一种具有损伤自感应功能的碳纤维相似模拟复合材料。研究发现随着碳纤维掺量的增加,相似材料电阻率变化与损伤系数演化规律趋于一致,且当相似模拟材料中碳纤维掺量≥2%,相似材料电阻率变化与损伤系数始终保持同步增长。基于此,探明了碳纤维相似模拟材料电阻率变化量与岩层损伤程度的关联效应,开展了近距离煤层过煤柱开采岩层结构动态演化与关键层破断时序物理模拟试验,分析了煤层开采全过程中的碳纤维相似材料电阻率变化特征,精准辨识了覆岩采动裂隙的发育程度、分布范围及各岩层损伤破裂时序,形成了适用于采矿工程相似模拟实验中的岩层损伤破裂动态过程新型量化与表征方法,为揭示采动岩层损伤破裂演化规律与优化岩层控制技术措施提供了科学依据。
Simulation experiments are a crucial method for investigating overburden failure,strata movement,and strata control during coal mining.However,traditional similar materials struggle to effectively monitor the internal damage,fracturing,and dynamic develop-ment processes within the strata during mining.To address this issue,carbon fibers were introduced into the field of similar material simu-lation experiments for mining.Leveraging the sensitive feedback of resistivity changes in response to damage of this composite material,This enabled real-time monitoring of internal damage and fracture patterns within the mining strata during similar simulation experiments,leading to the development of a carbon fiber similar simulation composite material with damage self-sensing properties.The study found that as the carbon fiber content increased,the evolution patterns of the electrical resistance change rate and the damage coefficient of the similar material tended to coincide.When the carbon fiber content in the similar material exceeded 2%,the electrical resistance change rate and the damage coefficient consistently exhibited synchronized growth with essentially identical increments.Based on this,the correlation between the variation of resistivity in carbon fiber similar simulation materials and the degree of rock layer damage was investigated.Dy-namic evolution experiments of the rock structure in close proximity to coal pillar extraction were conducted,focusing on the physical sim-ulation of the timing of key layer fractures.The characteristics of resistivity changes in carbon fiber similar materials throughout the coal mining process were analyzed,enabling precise identification of the development extent,distribution range,and fracture timing of the overburden mining-induced cracks.This research established a novel quantitative and characterization method for the dynamic process of rock layer damage and fracturing applicable in mining engineering simulation experiments.It provides a scientific basis for revealing the evolution of damage and fracture in mining-induced strata and for optimizing rock layer control technologies.
作者
朱卫兵
赵波智
宁杉
项佳豪
ZHU Weibing;ZHAO Bozhi;NING Shan;XIANG Jiahao(State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources,China University of Mining and Technology,Xuzhou 221116,China;School of Mines,China University of Mining and Technology,Xuzhou 221116,China;Jiangsu Engineering Laboratory of Mine Earthquake Monitoring and Prevention,China University of Mining and Technology,Xuzhou 221116,China)
出处
《煤炭科学技术》
北大核心
2025年第7期70-80,共11页
Coal Science and Technology
基金
国家重点研发计划资助项目(2021YFC2902101)
国家自然科学基金资助项目(52404148)。
关键词
相似材料模拟
碳纤维
损伤自感应
损伤系数
采动裂隙
矿山压力
岩层控制
simulation experiments
carbon fiber
damage self-sensing
damage coefficient
mining-induced fractures
ground pressure
strata control
作者简介
朱卫兵(1978-),男,江苏南通人,教授,博士。E-mail:zweibing@163.com;通讯作者:赵波智(2000-),男,内蒙古鄂尔多斯人,博士研究生。E-mail:cumtzbz@cumt.edu.cn。
