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Study and engineering application on the bolt-grouting reinforcement effect in underground engineering with fractured surrounding rock

机译：裂隙岩体地下工程锚杆注浆加固效果研究与工程应用

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摘要

Bolt-grouting support is an effective means for addressing the difficulty of fractured surrounding rock control in underground engineering. In this paper, to determine the improvement in the anchorage body interface strength resulting from grouting, theoretical equations for calculating the anchorage body interface shear strength before and after grouting were derived, and the influence law of various mechanical parameters (elastic modulus, cohesion, internal friction angle, and dilation angle) of the surrounding rock on the anchorage body interface strength were obtained. Based on the aforementioned theoretical analysis, a systematic field bolt-grouting test was performed on surrounding rock with the same lithology and different fragmentation degrees. The variation trend of the grout diffusion performance under the different grouting bolt length was analyzed. Furthermore, the effects law of various bolt-grouting parameters on the surrounding rock and support system were also revealed. The following results were obtained: (1) The pullout forces of the common bolts increased significantly after grouting. In addition, the grout diffusion basically stabilized 7 days after grouting. (2) The increasing rate of pullout force on the common bolt around the grouting bolt presented the rule of "Below Side Above". (3) With the length of grouting bolt increasing, its effective reinforcement range gradually expanded. (4) The variation in the grouting bolt length had a relatively insignificant impact on pullout forces of the common bolts in its immediate vicinity. Based on the above theory and experimental study, relevant engineering proposal were recommended and adopted in the design of site bolt-grouting support schemes. The research results can provide methods and basis for selecting and evaluating of grouting bolt parameters in underground engineering with fractured surrounding rock.
机译：螺栓注浆支护是解决地下工程中破裂性围岩控制难题的有效手段。为了确定灌浆对锚固体界面强度的改善作用，推导了灌浆前后锚固体界面抗剪强度的理论方程，并推导了各种力学参数（弹性模量，内聚力，内力）的影响规律。得到了围岩的摩擦角和膨胀角对锚固体界面强度的影响。基于上述理论分析，对岩性相同，碎裂度不同的围岩进行了系统的现场注浆试验。分析了不同注浆螺栓长度下灌浆扩散性能的变化趋势。此外，还揭示了各种锚固参数对围岩和支护系统的影响规律。得到以下结果：（1）灌浆后普通螺栓的拉拔力明显增加。另外，灌浆后7天灌浆扩散基本稳定。 （2）在注浆螺栓周围的普通螺栓上的拔出力的增加率呈现“以下>侧面>上方”的规则。 （3）随着注浆螺栓长度的增加，其有效加固范围逐渐扩大。 （4）注浆螺栓长度的变化对附近普通螺栓的拔出力影响相对较小。基于以上理论和实验研究，提出了相关的工程建议，并在现场锚固支护方案设计中采用。研究结果可为地下裂隙岩体工程注浆锚杆参数的选择和评价提供方法和依据。

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  • 来源
    《Tunnelling and underground space technology》 |2019年第2期|237-247|共11页
  • 作者

    Wang Q.; Qin Q.; Jiang B.; Yu H. C.; Pan R.; Li S. C.;

  • 作者单位

    Shandong Univ, Res Ctr Geotech & Struct Engn, Jinan 250061, Shandong, Peoples R China|China Univ Min & Technol, Key Lab GeoMech & Deep Underground Engn, Beijing 100083, Peoples R China;

    Shandong Univ, Res Ctr Geotech & Struct Engn, Jinan 250061, Shandong, Peoples R China|China Univ Min & Technol, Key Lab GeoMech & Deep Underground Engn, Beijing 100083, Peoples R China;

    Shandong Univ, Res Ctr Geotech & Struct Engn, Jinan 250061, Shandong, Peoples R China|Univ Jinan, Sch Civil Engn & Architecture, Jinan 250022, Shandong, Peoples R China;

    Shandong Univ, Res Ctr Geotech & Struct Engn, Jinan 250061, Shandong, Peoples R China|China Univ Min & Technol, Key Lab GeoMech & Deep Underground Engn, Beijing 100083, Peoples R China;

    Shandong Univ, Res Ctr Geotech & Struct Engn, Jinan 250061, Shandong, Peoples R China|China Univ Min & Technol, Key Lab GeoMech & Deep Underground Engn, Beijing 100083, Peoples R China;

    Shandong Univ, Res Ctr Geotech & Struct Engn, Jinan 250061, Shandong, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Fractured surrounding rock; Bolt-grouting reinforcement; Field test; Bolt-grouting parameters; Diffusion performance; Influence law;

    机译：裂隙围岩;注浆加固;现场试验;注浆参数;扩散性能;影响规律;

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