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基于超细材料的全风化花岗岩防渗注浆研究

李永丰 高宇豪 陈天乐 钟聚光 胡岳 李建中

李永丰, 高宇豪, 陈天乐, 钟聚光, 胡岳, 李建中. 基于超细材料的全风化花岗岩防渗注浆研究[J]. 地质科技通报, 2024, 43(1): 194-203. doi: 10.19509/j.cnki.dzkq.tb20220298
引用本文: 李永丰, 高宇豪, 陈天乐, 钟聚光, 胡岳, 李建中. 基于超细材料的全风化花岗岩防渗注浆研究[J]. 地质科技通报, 2024, 43(1): 194-203. doi: 10.19509/j.cnki.dzkq.tb20220298
LI Yongfeng, GAO Yuhao, CHEN Tianle, ZHONG Juguang, HU Yue, LI Jianzhong. Research on anti-seepage grouting in completely weathered granite based on superfine materials[J]. Bulletin of Geological Science and Technology, 2024, 43(1): 194-203. doi: 10.19509/j.cnki.dzkq.tb20220298
Citation: LI Yongfeng, GAO Yuhao, CHEN Tianle, ZHONG Juguang, HU Yue, LI Jianzhong. Research on anti-seepage grouting in completely weathered granite based on superfine materials[J]. Bulletin of Geological Science and Technology, 2024, 43(1): 194-203. doi: 10.19509/j.cnki.dzkq.tb20220298

基于超细材料的全风化花岗岩防渗注浆研究

doi: 10.19509/j.cnki.dzkq.tb20220298
基金项目: 

国家自然科学基金项目 41572269

详细信息
    作者简介:

    李永丰, E-mail: 38853023@qq.com

    通讯作者:

    高宇豪, E-mail: yhgao437@163.com

  • 中图分类号: TU472.6

Research on anti-seepage grouting in completely weathered granite based on superfine materials

More Information
  • 摘要:

    针对全风化花岗岩地层注浆过程中存在"吃水不吃浆"、可灌性差以及浆液的稳定性问题,提出了一种新的复合注浆材料,以提高完全风化花岗岩的防渗和力学性能。通过一系列室内试验研究了不同水固比、超细膨润土含量和超细硅酸盐水泥含量对注浆材料工程性能和浆液形成机制的影响,确定了水泥浆的最佳配方,采用微观形貌试验揭示了2种超细材料对浆液流动性、稳定性和结石体强度的作用机理,最后通过现场试验验证了注浆材料的可注性和有效性。结果表明,水固比为1.2、超细膨润土和超细硅酸盐水泥掺量分别为10%、普通硅酸盐水泥掺量80%配方的复合浆液具有很好的流动性、稳定性和抗压强度,漏斗黏度为35.5 s,析水率为2.4%,7 d和28 d的抗压强度均大于5 MPa;复合材料中的超细膨润土的掺量对浆液性能起主导作用,超细膨润土含量及其水化胶体的形态与分布决定浆液稳定性,而适量的超细硅酸盐水泥增加了细颗粒含量,使得胶结体更易填充颗粒间隙,改善了浆液可注性和结石体强度;该复合注浆材料在现场试验中表现优异,具有良好的注浆性能,注浆后形成的墙体在防渗效果和加固性能上均满足设计要求。

     

  • 图 1  全风化花岗岩粒径级配曲线

    Figure 1.  Grain size distribution of CWG

    图 2  注浆材料粒径级配曲线

    Figure 2.  Grain size distribution of grouting materials

    图 3  不同水泥的漏斗黏度试验结果

    Figure 3.  Funnel viscosity test results of different cements

    图 4  不同水泥的析水率试验结果

    Figure 4.  Bleeding rate test results for different cements

    图 5  SSB的漏斗黏度试验结果

    Figure 5.  Funnel viscosity test results of SSB

    Figure 6.  Filter loss test results of SSB

    图 7  抗压强度试验结果

    Figure 7.  Results of the compressive strength test

    图 8  SEM图

    Figure 8.  SEM images

    图 9  现场试验注浆孔和检查孔分布图(单位: mm)

    Figure 9.  Field test grouting hole and inspection hole distribution map

    图 10  注浆前后波速分布图

    Figure 10.  Distribution of wave velocity before and after grouting

    图 11  先导孔钻孔取心

    a.孔深4.2~8.3 m段岩心; b.孔深44.7~49.0 m段岩心

    Figure 11.  Pilot hole drilling and coring

    图 12  检查孔钻孔取心

    a.孔深4.0~8.0 m段岩心; b.孔深44.7~48.5 m段岩心

    Figure 12.  Inspection hole drilling and coring

    图 13  复合墙体开挖检查

    a整体; b.侧墙

    Figure 13.  Composite wall excavation inspection

    表  1  全风化花岗岩基本物理性质指标

    Table  1.   Basic physical properties of CWG

    密度/(g·cm-3) 含水率/% 干密度/(g·cm-3) 颗粒相对密度 孔隙比
    1.73~2.00 13.9~21.7 1.42~1.58 2.618~2.635 0.435~0.852
    注:试验按照文献[29]实施
    下载: 导出CSV

    表  2  滤失量测定数据

    Table  2.   Data of filtration

    水固比 SSB掺量wB/% SPC掺量wB/%
    0 5 10 15
    滤失量/mL
    1.2 6 108 106 102 105
    1.3 6 118 112 116 112
    1.4 6 132 119 109 117
    1.2 8 101 93 89 85
    1.3 8 113 103 91 101
    1.4 8 117 110 104 109
    1.2 10 74 72 69 71
    1.3 10 75 73 71 74
    1.4 10 85 84 82 83
    下载: 导出CSV

    表  3  SCBS流动性和稳定性试验

    Table  3.   Fluidity and stability test of SCBS

    水固比 SSB掺量wB/% SPC掺量wB/% OPC掺量wB/% 漏斗黏度/s 析水率/%
    1.2 4 16 80 31.7 16.0
    1.2 6 14 80 32.6 9.0
    1.2 8 12 80 33.2 6.5
    1.2 10 10 80 35.5 2.4
    下载: 导出CSV

    表  4  SCBS性能

    水固比 SSB掺量wB/% SPC掺量wB/% OPC掺量wB/% 漏斗黏度/s 析水率/%
    1.2 10 10 80 34.8~36.2 2~3
    下载: 导出CSV

    表  5  注浆前后压水试验结果

    Table  5.   Results of the water pressure test before and after grouting

    孔号 透水率/Lu 平均透水率/Lu
    X1 75.16 48.16 17.44 28.75 16.94 13.16 101.92 5.43 11 28.94
    J1 1.74 0 0.58 0.21 0.54 0 0.21 0.11 0.08 0.32
    J2 0.69 0.16 0 0.18 0.18 1.39 0 0.05 0.10 0.26
    J3 2.08 0 0 0.80 0 0 0.56 / / 0.30
    J4 1.02 0.20 0 1.25 0 0.38 0.09 0.15 2.50 0.50
    下载: 导出CSV
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  • 收稿日期:  2022-06-20
  • 录用日期:  2022-09-13
  • 修回日期:  2022-09-08

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