摘要
为实现宜昌市肖家河磷矿规模化碎石胶结充填,开展碎石胶结充填体单轴抗压试验,研究不同灰砂比、料浆质量浓度和养护龄期下充填体的抗压强度、变形特性以及破坏特征。研究结果表明:养护龄期相同时,随着灰砂比和料浆质量浓度增加,碎石颗粒之间的胶结效果更好,充填体的抗压强度也更高;当灰砂比相同时,随着料浆质量浓度的增大,充填体试样的弹性模量增大,峰值应力对应的应变率降低,充填体的抗变形能力增强;当料浆质量浓度相同时,随着灰砂比的减小,胶结效果减弱,充填体的形变量增大;随着养护龄期的增加,充填体试样的破坏形态由拉伸破坏逐渐转变为剪切破坏,且养护龄期越长,充填体表面的裂纹数量和块体剥落面积均减少,破坏程度也越小。通过试验研究确定了肖家河磷矿碎石胶结充填体强度灰砂比的最佳配比为1∶8、料浆质量浓度为86%、养护龄期为28 d,可满足矿山充填方案的技术经济要求。
In order to realize the large-scale crushed stone cement filling of Xiaojiahe Phosphate Mine in Yichang City,the uniaxial compressive test of crushed stone cement filling has been carried out to study the compressive strength of the backfill,deformation properties and destruction properties under different lime-sand ratio,slurry mass concentration and curing age in this paper.The research results show that at the same curing age,the cementation effect between gravel particles is better and the compressive strength of backfill is also higher with the increase of cement sand ratio and slurry mass concentration.When the cement-sand ratios remain unchanged,the elastic modulus of the backfill sample increases,the strain rate corresponding to the peak stress decreases and the anti-deformation ability of the backfill is enhanced with the increase of slurry mass concentration.When the slurry mass concentration remains unchanged,the cementing effect is weakened and the shape variable of backfill increases with the decrease of cement-sand ratio.With the increase of curing age,the failure mode of backfill samples gradually changes from tensile failure to shear failure.The number of cracks on the surface of backfill and the area of block exfoliation decrease when the curing age increases,so the failure degree is smaller.Through experimental study,the optimum scheme about filling material has been determined as that the same lime-sand ratio is 1∶8,the slurry mass concentration is 86%,and the curing age is 28 d,which meets the technical and economic requirements of backfill scheme in Xiaojiahe Phosphate Mine.
作者
刘超军
柯丽华
姚囝
林坤峰
刘一航
LIU Chaojun;KE Lihua;YAO Nan;LIN Kunfeng;LIU Yihang(School of Resource and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Sinosteel Corporation Wuhan Safety and Environmental Protection Research Institute,Wuhan 430081,China)
出处
《中国矿业》
2023年第5期124-130,137,共8页
China Mining Magazine
基金
湖北省重点研发计划项目资助(编号:2020BCA082)
湖北省安全生产专项资金科技项目资助(编号:SJZX20211004)
湖北省安全生产专项资金科技项目资助(编号:HBYF-2021-C1078-1)。
关键词
磷矿
碎石胶结充填
单轴抗压强度
破坏特征
phosphate mine
crushed stone cement filling
uniaxial compressive strength
failure characteristic
