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深部巷道围岩复合注浆加固技术

付玉凯 王涛 孙志勇 岳延朋

付玉凯,王涛,孙志勇,等. 深部巷道围岩复合注浆加固技术[J]. 工矿自动化,2022,48(7):105-112.  doi: 10.13272/j.issn.1671-251x.2022040063
引用本文: 付玉凯,王涛,孙志勇,等. 深部巷道围岩复合注浆加固技术[J]. 工矿自动化,2022,48(7):105-112.  doi: 10.13272/j.issn.1671-251x.2022040063
FU Yukai, WANG Tao, SUN Zhiyong, et al. Composite grouting reinforcement technology for deep roadway surrounding rock[J]. Journal of Mine Automation,2022,48(7):105-112.  doi: 10.13272/j.issn.1671-251x.2022040063
Citation: FU Yukai, WANG Tao, SUN Zhiyong, et al. Composite grouting reinforcement technology for deep roadway surrounding rock[J]. Journal of Mine Automation,2022,48(7):105-112.  doi: 10.13272/j.issn.1671-251x.2022040063

深部巷道围岩复合注浆加固技术

doi: 10.13272/j.issn.1671-251x.2022040063
基金项目: 国家自然科学基金项目(51804159);陕西省自然科学基础研究计划资助项目(2022JM-280 );天地科技股份有限公司科技创新创业资金专项项目(2019-TD-QN004)。
详细信息
    作者简介:

    付玉凯(1985— ),男,河南安阳人,副研究员,博士,主要从事巷道支护理论与技术研究工作,E-mail:543913570@qq.com

  • 中图分类号: TD265.4

Composite grouting reinforcement technology for deep roadway surrounding rock

  • 摘要: 针对深部巷道围岩复杂地质条件下单一注浆方式和注浆材料不能达到理想的注浆效果问题,提出了一种深部巷道围岩复合注浆加固技术。以山西某矿3210孤岛工作面为例,阐述了复合注浆加固技术原理及应用。首先,结合现场试验区域的地质力学测试结果、煤岩体物理力学参数等,计算3210回风巷各破裂区的范围;其次,基于围岩分区破裂特点,提出3步注浆工艺,即浅部低压渗透注浆、深部高压劈裂注浆和补充注浆,并根据各分区的范围确定3步注浆工艺中各个钻孔的深度;然后,根据各个分区中裂隙的发育程度和裂隙开度,选择相应的注浆材料:高渗透区宜采用无机水泥注浆材料,中等渗透区宜采用超细水泥注浆材料,低渗透区宜采用高分子化学浆液进行补注;最后,根据现场注浆试验,确定不同破裂区的注浆压力参数。采用注浆加固岩体锚固力、注浆加固岩体单轴抗压强度和围岩完整性3个指标综合判断3210回风巷注浆加固效果:采用复合注浆加固技术后,巷帮煤体锚固力提高144%,达到230 kN;顶板和巷帮围岩单轴抗压强度分别增加10.9%和18.5%,分别达到50.68 MPa和23.37 MPa;巷帮煤体波速提高15.2%,达到750 m/s。从注浆区域与未注浆区域围岩变形速率和变形量来看,复合注浆加固技术取得了良好效果。

     

  • 图  1  3210工作面巷道布置

    Figure  1.  Roadway layout of 3210 working face

    图  2  3210工作面岩层柱状图

    Figure  2.  Rock stratum histogram of 3210 working face

    图  3  深部巷道围岩应力与破裂区

    Figure  3.  Surrounding rock stress and crack zone in deep roadway

    图  4  裂隙煤岩体不同破裂区域PQt特征曲线

    Figure  4.  P-Q-t characteristic curves for different crack zones of crack coal and rock mass

    图  5  围岩锚杆锚固力−位移曲线

    Figure  5.  Anchoring force-displacement curve of surrounding rock bolt

    图  6  围岩单轴抗压强度

    Figure  6.  Uniaxial compressive strengths of surrounding rock

    图  7  围岩波速

    Figure  7.  Wave velocities of surrounding rock

    表  1  3210回风巷各分区范围

    Table  1.   Crack zone range of 3210 return air roadway m

    区域范围厚度半径
    巷道0~2.302.30
    完全破碎区2.30~6.143.846.14
    破碎降低区6.14~7.931.797.93
    塑性硬化区7.93~9.021.099.02
    类原岩区9.02~∞
    下载: 导出CSV

    表  2  高渗透区注浆材料配比参数

    Table  2.   Proportioning parameters of grouting materials in high permeability zone

    注浆材料水灰比体积比水玻璃浓度
    普通42.5号水泥0.6~1
    普通42.5号水泥+水玻璃(0.6~1)∶11∶(1∶0.3)38~42 °Be′
    下载: 导出CSV

    表  3  超细水泥凝固后单轴抗压强度

    Table  3.   Uniaxial compressive strength of superfine cement after solidification

    水灰比超细水泥凝固后单轴抗压强度/MPa
    t0 = 2 ht0 = 4 ht0 = 8 ht0 = 24 ht0 = 3 d
    0.6∶116.320.521.722.322.8
    0.8∶112.813.814.614.815.7
    1∶19.610.511.411.912.5
    1.2∶17.58.29.610.511.6
    下载: 导出CSV

    表  4  低渗透区注浆材料配比参数

    Table  4.   Proportioning parameters of grouting materials in low permeability zone

    注浆材料体积比
    天地101号加固材料1∶1
    微纳米无机−有机复合改性材料1∶1
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-04-21
  • 修回日期:  2022-07-16
  • 网络出版日期:  2022-06-28

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