摘要
为研究纤维增强尾砂充填体强度机制以及长时养护下的关键影响因素,采用室内试验和理论分析方法,测试分析120 d长时养护条件下纤维含量、长度、种类对增强尾砂充填体强度的影响,结合Mohr-Coulomb强度理论分析纤维增强尾砂充填体机制。结果表明:当掺纤维含量较低时,近水平纤维段的拉紧力是增强尾砂充填体强度的内因;随着纤维含量的增加,尾砂充填体试样单轴抗压强度变化特征与纤维长度密切相关,当纤维长度较小时,试样单轴抗压强度呈现先增加后减小的变化特征,当纤维长度较大时,试样单轴抗压强度呈现先减小后增加再减小或先减小后增加的变化过程;随着聚丙烯纤维长度的增加,试样单轴抗压强度变化过程为先增加后降低再增加再降低;纤维种类对尾砂充填体单轴抗压强度和破坏形态影响明显,相较于聚丙烯纤维,掺玻璃纤维更有利于提升尾砂充填体单轴抗压强度,但在提升韧性方面则相对较弱,破坏程度和范围也更大。研究成果对井下采空区掺纤维尾砂膏体充填、深井沿空留巷等具有一定的参考价值。
In order to study the mechanism of tailings filling body strength reinforced by fiber and the key influencing factors under long-term curing,the effects of fiber content,length and type on reinforcing the strength of tailings filling body under 120days long-term curing conditions were tested and analyzed by laboratory test and theoretical analysis.The mechanism of tailings filling body strength reinforced by fiber was analyzed by Mohr-Coulomb strength theory.The results show that when the fiber content is low,the tensile force of the near-horizontal fiber segment is the internal cause to enhance the strength of the tailings filling body.With the increase of fiber content,the variation characteristics of uniaxial compressive strength of tailings filling body sample are closely related to the fiber length.When the fiber length is small,the uniaxial compressive strength of the sample increases first and then decreases.When the fiber length is large,the uniaxial compressive strength of the sample decreases first and then increases and then decreases or decreases first and then increases.With the increase of polypropylene fiber length,the uniaxial compressive strength of the sample increases first,then decreases,then increases and then decreases.The fiber type has a significant effect on the uniaxial compressive strength and failure mode of tailings filling body.Compared with polypropylene fiber,glass fiber is more conducive to improving the uniaxial compressive strength of tailings filling body,but it is relatively weak in improving toughness,and the degree and scope of damage are greater.The research results have certain reference value for the filling of fiber tailings paste in underground goaf and the gob-side entry retaining in deep wells.
作者
齐红霞
赵庆新
张庆超
冯国力
严红
QI Hongxia;ZHAO Qingxin;ZHANG Qingchao;FENG Guoli;YAN Hong(School of Architectural Construction,Jiangsu Vocational Institute of Architectural Technology,Xuzhou,Jiangsu 221116,China;Jiangsu Collaborative Innovation Center for Building Energy Saving and Construction Technology,Xuzhou,Jiangsu 221116,China;College of Civil Engineering,Tongji University,Shanghai 200092,China;School of Mines,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)
出处
《矿业研究与开发》
CAS
北大核心
2024年第6期121-127,共7页
Mining Research and Development
基金
江苏建筑节能与建造技术协同创新中心青年博士基金项目(SJXTBS2112)
江苏建筑职业技术学院博士专项基金项目(JYJBZX20-04)。
关键词
尾砂充填体
聚丙烯纤维
玻璃纤维
单轴抗压强度
破坏形态
Tailings filling body
Polypropylene fiber
Glass fiber
Uniaxial compressive strength
Failure mode
