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基于正交试验的不同胶结强度Bimrock岩体力学特性试验研究

吴迁 魏继红 刘刚 施威 李凯

吴迁,魏继红,刘刚,等. 基于正交试验的不同胶结强度Bimrock岩体力学特性试验研究[J]. 水文地质工程地质,2023,50(6): 120-128 doi:  10.16030/j.cnki.issn.1000-3665.202210014
引用本文: 吴迁,魏继红,刘刚,等. 基于正交试验的不同胶结强度Bimrock岩体力学特性试验研究[J]. 水文地质工程地质,2023,50(6): 120-128 doi:  10.16030/j.cnki.issn.1000-3665.202210014
WU Qian, WEI Jihong, LIU Gang, et al. An experimental study of the mechanical properties of the Bimrock rock mass with different cementing strength based on orthogonal tests[J]. Hydrogeology & Engineering Geology, 2023, 50(6): 120-128 doi:  10.16030/j.cnki.issn.1000-3665.202210014
Citation: WU Qian, WEI Jihong, LIU Gang, et al. An experimental study of the mechanical properties of the Bimrock rock mass with different cementing strength based on orthogonal tests[J]. Hydrogeology & Engineering Geology, 2023, 50(6): 120-128 doi:  10.16030/j.cnki.issn.1000-3665.202210014

基于正交试验的不同胶结强度Bimrock岩体力学特性试验研究

doi: 10.16030/j.cnki.issn.1000-3665.202210014
基金项目: 国家自然科学基金项目(41672258)
详细信息
    作者简介:

    吴迁(1998-), 男, 硕士研究生, 主要从事岩土体结构特征及稳定性方面的研究工作。E-mail:wu_qian@hhu.edu.cn

    通讯作者:

    魏继红(1976-),女,博士,教授,主要从事岩土体稳定性工作。E-mail:wjhfish@hhu.edu.cn

  • 中图分类号: TU458;P642.3

An experimental study of the mechanical properties of the Bimrock rock mass with different cementing strength based on orthogonal tests

  • 摘要: Bimrock在不同胶结强度下的力学特性鲜有研究,而胶结强度对Bimrock力学特性和变形破坏特征有着重要影响。为探究不同胶结强度对Bimrock力学特性的影响规律,通过正交试验设计法,开展Bimrock基质配比试验,对不同配比基质试样的强度力学参数进行参数敏感性分析,基于正交试验结果,制作不同胶结强度的Bimrock试样,通过单轴压缩试验,分析不同胶结强度对Bimrock力学特性的影响。结果表明:Bimrock试样的单轴抗压强度和弹性模量与其胶结强度呈正相关,从弱胶结到强胶结,单轴抗压强度从11.02 MPa增加到34.21 MPa,弹性模量从2.11 GPa增加到5.57 GPa;随着胶结强度的增加,试样在变形至破坏的各阶段表面裂纹数量均减少;强胶结试样的压缩破坏模式表现为单条主裂纹的贯通破坏,破坏时间较短,脆性破坏明显;中等胶结试样发生整体与局部剪切破坏,表现为一条明显贯穿整个试样和一条仅贯穿试样下半部分的剪切破坏面;弱胶结试样发生横向拉张破坏,可见多条沿竖直方向的张拉裂纹,局部出现张剪破坏并存的破坏特征,从变形到破坏产生的裂纹较多且较为破碎,破坏时间相对较长。Bimrock岩体工程问题复杂而且较难处理,针对Bimrock力学特性与变形破坏特征的研究对工程建设以及地质灾害防治有重要意义。
  • 图  1  试验材料

    Figure  1.  Test materials

    图  2  制样流程

    Figure  2.  Process of specimen production

    图  3  不同配比的Bimrock基质试样

    Figure  3.  Bimrock matrix samples with different proportions

    图  4  棱状石灰岩块

    Figure  4.  Prismatic limestone block

    图  5  Bimrock试样

    Figure  5.  Bimrock specimens

    图  6  单轴压缩试验轴向应力-轴向应变关系曲线

    Figure  6.  Axial stress-axial strain relation curve of the uniaxial compression test

    图  7  单轴抗压强度和弹性模量与胶结强度关系曲线

    Figure  7.  Curves between the uniaxial compressive strength, elastic modulus and cementation strength

    图  8  Bimrock试样压缩裂纹扩展过程

    Figure  8.  Compression crack propagation process of Bimrock specimens

    图  9  试验后的Bimrock破坏试样

    Figure  9.  Damaged bimrock specimen after test

    表  1  各因素水平值

    Table  1.   Level of the factors

    水平组数石英砂/%水泥∶石膏水含量/%
    水平1301.8∶119
    水平2452.4∶120
    水平3603.0∶121
    下载: 导出CSV

    表  2  正交配比方案

    Table  2.   Orthogonal matching schemes

    方案 J1 J2 J3 J4 J5 J6 J7 J8 J9
    石英砂/% 30 30 30 45 45 45 60 604 60
    水泥∶石膏 1.8∶1 2.4∶1 3.0∶1 1.8∶1 2.4∶1 3.0∶1 1.8∶1 2.4∶1 3.0∶1
    水含量/% 19 20 21 20 21 19 21 19 20
    下载: 导出CSV

    表  3  各配比方案试样结果

    Table  3.   Experimental results of the matching schemes

    方案J1J2J3J4J5J6J7J8J9
    σc/MPa20.2123.9629.1216.1321.9223.968.0412.6414.62
    E/GPa3.243.865.013.253.514.502.242.703.68
    c/MPa2.182.613.081.421.792.150.400.781.22
    φ/(°)42.546.734.437.648.542.327.438.636.4
    下载: 导出CSV

    表  4  各因素敏感性分析表

    Table  4.   Sensitivity analysis of the factors

    水平组数单轴抗压强度/MPa弹性模量/GPa黏聚力/MPa内摩擦角/(°)
    A因素B因素C因素A因素B因素C因素A因素B因素C因素A因素B因素C因素
    水平124.4314.7918.944.042.913.482.621.331.7041.2035.8041.10
    水平220.6719.5118.243.753.363.601.791.731.7542.8044.6040.20
    水平311.7722.5719.962.874.403.590.802.151.7634.1037.7036.80
    极差12.667.781.721.171.490.121.820.820.068.708.804.30
    下载: 导出CSV

    表  5  不同胶结强度Bimrock及纯基质的强度参数

    Table  5.   Strength parameters of Bimrock and pure matrix with different bonding strengths

    试样编号 σc/MPa E/GPa 峰值应变
    /%
    σc增量
    百分比/%
    E增量
    百分比/%
    B7 11.02 2.11 0.76
    B5 27.18 4.19 0.96 146.64 98.58
    B3 34.21 5.57 0.95 210.44 163.98
    J7 8.04 2.24
    J5 21.92 3.51
    J3 29.12 5.01
    下载: 导出CSV
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  • 收稿日期:  2022-10-09
  • 修回日期:  2023-01-04
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