改性高水材料充填支柱尺寸效应及破坏特征分析  

Analysis on size effect and failure characteristics of filling pillars with modified high-water material

作　　者：王 熊祖强[1,2] 苏承东 WANG Yan;XIONG Zuqiang;SU Chengdong(School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China;Henan Collaborative Innovation Center of Coal Work Safety,Jiaozuo 454003,China)

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作454003 [2]煤炭安全生产河南省协同创新中心,河南焦作454003

出　　处：《煤炭科学技术》2021年第12期82-88,共7页Coal Science and Technology

基　　金：河南省高校科技创新团队和创新人才支持计划资助项目(17HASTIT032);河南省创新科技团队支持计划资助项目(CXTD2017088)。

摘　　要：为研究改性高水材料充填支柱尺寸对承载性能的影响,在高水材料充填支柱试样中添加0.2%聚丙烯纤维进行改性,通过对比改性试样及未改性试样的单轴压缩试验结果、破坏过程及形貌,分析其尺寸效应和破坏特征,最后通过扫描电镜(SEM)对试验结果进行进一步讨论。结果表明:改性后高水材料充填支柱尺寸效应特征不变,随高径比增大,峰值强度及峰值应变逐渐降低,弹性模量逐渐增大;改性后试样的承载性能提高,峰值强度提高10.78%,峰值应变增大28.62%;试样破坏类型不受高径比和纤维的影响,均为“X”—劈裂型剪切组合破坏;由于纤维的阻裂效果,改性后材料试样的整体受压稳定性显著提高;SEM微观形态对比可知,纤维阻止原有裂隙发育的同时延缓新裂隙的产生,使材料具有更稳定钙矾石骨架结构,间接增大了材料强度并表现出较高的残余强度。In order to study the influence of size effect of filling pillars with modified high-water material on the load-bearing capacity 0.2%polypropylene fiber was added to the samples of high-water filling pillar material for modification.By comparing the uniaxial com-pression test results,failure process and morphology of the modified and unmodified samples,the size effect and failure characteristics were analyzed.Finally,the test results were further discussed by scanning electron microscopy(SEM).The results show that the size effect char-acteristics of the high-water-filled pillars remain unchanged.With the increase of height-diameter ratio,peak strength and peak strain gradually decrease and the elastic modulus gradually increases.The modified samples’load-bearing capacity increases,and the peak strength increases by 10.78%,the peak strain increases by 28.62%;the failure types of samples are not affected by height-diameter ratio and the fibers,all of which belong to“X”shear failure of splitting type.Due to the fiber’s crack resistance effect,the integral compressive stability of the modified samples is significantly improved.SEM microscopic morphology comparison shows that the fibers prevent the de-velopment of original cracks while delaying the generation of new cracks,so that the material has a more stable ettringite skeleton structure,which indirectly increases the strength and performance of the material and show a higher residual strength.

关 键 词：改性高水材料 充填支柱 尺寸效应 充填支护 

分 类 号：TD315[矿业工程—矿井建设]