岩土力学 ›› 2018, Vol. 39 ›› Issue (S2): 45-52.doi: 10.16285/j.rsm.2018.1419

• 基础理论与实验研究 • 上一篇    下一篇

高阶段胶结充填体强度空间变化规律研究

魏晓明1,郭利杰1,李长洪2,张立新3,罗文冲3,刘 仁3   

  1. 1. 北京矿冶科技集团有限公司,北京 102628;2. 北京科技大学 土木与资源工程学院,北京 100083; 3. 安徽开发矿业有限公司,安徽 六安 237426
  • 出版日期:2018-12-21 发布日期:2019-01-02
  • 通讯作者: 郭利杰,男,1980年生,博士,教授级高级工程师,主要从事矿山充填技术方面的研究工作。E-mail: guolijie@bgrimm.com E-mail:weixiaoming@bgrimm.com
  • 作者简介:魏晓明,男,1989年生,博士,主要从事充填体力学方面的研究工作。
  • 基金资助:
    “十三五”国家重点研发计划课题(No.2016YFC0600709)

Study of space variation law of strength of high stage cemented backfill

WEI Xiao-ming1, GUO Li-jie1 , LI Chang-hong2, ZHANG Li-xin3, LUO Wen-chong3, LIU Ren3   

  1. 1. BGRIMM Technology Group, Co., Ltd., Beijing 102628, China; 2. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China; 3. Anhui Development Mining Co., Ltd., Anhui, Lu’an 237426, China
  • Online:2018-12-21 Published:2019-01-02
  • Supported by:
    This work was supported by the Project of National Key Research and Development Program of China in the 13th Five-year Plan(2016YFC0600709).

摘要: 在高阶段两步骤回采过程中一步骤胶结充填质量对二步骤矿柱的安全回采具有重要意义。基于李楼铁矿一步骤胶结充填体强度检测和微观电镜扫描实验,对井下原位强度与地表试件进行差异化分析,获得了高阶段采场充填体强度增值呈“驼峰”变化规律,分为上部(-330~-310 m)、中部(-360~-330 m)和下部(-390~-360 m)。采用SEM孔隙定量表征技术,提取了1:4充填采场的3个峰值和4个谷值的孔隙率,阐释了充填体强度增值分布趋势与孔隙率呈非线性负相关,遵循指数函数y = 29.281e–0.032x的定量关系。结合采场工程布置,从宏观特征(揭露和取芯)和微观孔隙结构发育特征耦合揭示了自重压力与充填挡墙对高阶段胶结充填体固结强度的作用机制,进而调整采场充填料浆配比参数,保证矿山安全高效回采。

关键词: 高阶段胶结充填体, 空间变化规律, 电镜扫描, 宏微观耦合, 工程优化

Abstract: During the two-step mining process in the high stage, the cementation quality of one step was of great significance to the safe recovery of the two-step pillar. In the Lilou iron mine, the difference strength between the in situ samples and the surface test blocks is analyzed based on the strength detection and scanning election microscope(SEM) experiments. The in situ strength increment of high stage cemented backfill is "hump" morphological distribution. It is divided into the upper part (-330 - -310 m), the middle part (-360 - -330 m) and the lower segment (-390 - -360 m). The porosity of 3 peaks and 4 valley values of 1:4 filling stope is extracted by the SEM pore characterization technique; and the nonlinear negative correlation between the strength increment and the porosity is explained, in accordance with the exponent function of y = 29.281e–0.032x. Combining engineering arrangement, the mechanism of deadweight pressure and drainage arrangement on the curing strength of high stage cemented backfill is revealed from the coupling macroscopic(exposing and in situ coring) and micro-pore structure development characteristics. Then the ratio parameters of filling slurry in the high stage stope are adjusted, which in the middle part is reduced from 1:6 to 1:8 and the heights of -325, -350 m and -375 m are reduced from 1:4 to 1:6, to ensure the safe and efficient mining.

Key words: high stage cemented backfill, space variation law, scanning electron microscopy, macro-micro coupling, engineering optimization

中图分类号: 

  • TD853.343
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