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土石混合体—基岩界面剪切力学特性试验研究

杨忠平, 蒋源文, 李诗琪, 李进, 胡元鑫

杨忠平, 蒋源文, 李诗琪, 李进, 胡元鑫. 土石混合体—基岩界面剪切力学特性试验研究[J]. 岩土工程学报, 2020, 42(10): 1947-1954. DOI: 10.11779/CJGE202010021
引用本文: 杨忠平, 蒋源文, 李诗琪, 李进, 胡元鑫. 土石混合体—基岩界面剪切力学特性试验研究[J]. 岩土工程学报, 2020, 42(10): 1947-1954. DOI: 10.11779/CJGE202010021
YANG Zhong-ping, JIANG Yuan-wen, LI Shi-qi, LI Jin, HU Yuan-xin. Experimental study on shear mechanical properties of soil-rock mixture-bedrock interface[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(10): 1947-1954. DOI: 10.11779/CJGE202010021
Citation: YANG Zhong-ping, JIANG Yuan-wen, LI Shi-qi, LI Jin, HU Yuan-xin. Experimental study on shear mechanical properties of soil-rock mixture-bedrock interface[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(10): 1947-1954. DOI: 10.11779/CJGE202010021

土石混合体—基岩界面剪切力学特性试验研究  English Version

基金项目: 

国家重点研发计划项目 2018YFC1504802

中央高校基本科研业务经费项目 2019CDXYTM0032

国家自然科学基金项目 41772306

详细信息
    作者简介:

    杨忠平(1981—),男,教授,博士生导师,主要从事环境岩土与边坡稳定性方面的教学与研究工作。E-mail:yang-zhp@163.com

  • 中图分类号: TU431

Experimental study on shear mechanical properties of soil-rock mixture-bedrock interface

  • 摘要: 填方体-下伏基岩接触面间的剪切强度是控制高填方体或堆积体边坡稳定性的重要因素,界面强度参数取值是高填方工程设计的重要参数之一。通过较系统地室内大型直剪试验探讨了接触面粗糙度对土石混合料-基岩接触面剪切力学特性的影响。结果表明:在低法向应力作用下,剪应力-剪切位移曲线前期呈现出应变硬化现象,后期呈现出塑性应变现象,且接触面粗糙度越大接触面发生剪切破坏时变形越小;在高法向应力作用下,曲线呈现出应变硬化现象,无明显峰值;相同法向应力水平作用下,接触面粗糙度越大,土石混合体-基岩接触面剪切刚度越大。剪切界面上块石的破碎形态可分为完全破碎、部分破碎和表面磨损3种,随着接触面粗糙度的增加,剪切界面上块石的破碎总数也增加。接触面的抗剪强度、内摩擦角和表观黏聚力随着接触面粗糙度的增加而增大,相比于内摩擦角,接触面的表观黏聚力增大较为明显。接触面粗糙度对剪切带宽度有影响作用,表现为接触面粗糙度越大,剪切带越宽。
    Abstract: The shear strength of the interface between the fill and the underlying bedrock is an important factor to control the stability of high fill or accumulation slopes. The value of the interface strength parameter is one of the important parameters for the design of high backfills. The effect of the contact surface roughness on the shear mechanical properties of the soil-rock mixture-bedrock contact surface is explored through the systematic large-scale indoor direct shear tests.The test results show that under the action of low normal stress, the shear stress-shear displacement curve shows strain hardening in the early stage and plastic strain in the later stage, and the greater the roughness of the contact surface, the more the contact surface deforms when shear failure occurs. Under the action of high normal stress, the curve shows strain hardening without obvious peaks. Under the same normal stress level, the greater the contact surface roughness, the greater the shear stiffness of the soil-rock mixture-base rock interface. The crushing morphology of the rock at the shear interface includes three types: complete crushing, partial crushing, and surface abrasion. As the contact surface roughness increases, the total number of rock crushing at the shear interface also increases. The shear strength, internal friction angle and apparent cohesion of the contact surface increase with the increase of the roughness of the contact surface. Compared with the internal friction angle, the apparent cohesion of the contact surfaces increases significantly. The roughness of the contact surface has an effect on the width of the shear band, which shows that the larger the roughness of the contact surface is, the wider the shear band is.
  • 图  1   填方体边坡示意图

    Figure  1.   Schematic diagram of fill slope

    图  2   ZJ50-2G大型粗粒土压缩直剪仪示意图

    Figure  2.   ZJ50-2G large coarse soil compression direct shear apparatus

    图  3   样本筛分结果

    Figure  3.   Sample sieving results

    图  4   土石混合体试样级配曲线

    Figure  4.   Gradation curve of soil-rock mixture samples

    图  5   台阶状灰岩试件界面示意图

    Figure  5.   Interface diagram of step limestone test piece

    图  6   加工后的岩石试件

    Figure  6.   Processed rock samples

    图  7   剪切应力-剪切位移曲线

    Figure  7.   Shear stress-shear displacement curves

    图  8   块石骨架形成示意图

    Figure  8.   Schematic diagram of block stone skeleton formation

    图  9   块石破碎后重新形成骨架示意图

    Figure  9.   Schematic diagram of re-formed skeleton after rock is broken

    图  11   块石破碎形态

    Figure  11.   Broken forms of block stone

    图  10   块石破碎模式示意图

    Figure  10.   Schematic diagram of block crushing mode

    图  12   染色块石破碎与粗糙度关系

    Figure  12.   Relationship between broken stone blocks and roughness

    图  13   不同接触面粗糙度下抗剪强度与法向应力关系曲线

    Figure  13.   Relationship between shear strength and normal stress under different contact surface roughnesses

    图  14   接触面强度参数与粗糙度关系曲线

    Figure  14.   Relationship between contact surface strength parameters and roughness

    图  15   不同粗糙度下剪切带示意图

    Figure  15.   Schematic diagram of shear zone with different roughnesses

    表  1   土石混合体及灰岩基本物理参数指标

    Table  1   Basic physical parameter indexes of soil-rock aggregate

    土体类型物理参数指标
    干密度/(g·m-3)孔隙比天然含水率/%天然密度/(kg·m-3)c/kPaφ/(°)弹性模量/GPa单轴抗压强度/MPa
    土石混合体17880.249.32211023.910.54
    灰岩2730143335.6729.1468.09
    下载: 导出CSV

    表  2   台阶基岩界面力学参数指标

    Table  2   Mechanical parameter indexes of step bedrock interface

    试件编号坡率台阶高/cm台阶宽/cm粗糙度Y/mmJ斜面α/(°)
    11∶225500.39926.56
    21∶1.752543.750.43129.74
    31∶1.52537.440.46233.69
    下载: 导出CSV

    表  3   室内大型直剪试验方案

    Table  3   Indoor large-scale direct shear test schemes

    试件编号粗糙度C法向压力/kPa
    10.399200,400,600,800
    20.431200,400,600,800
    30.462200,400,600,800
    下载: 导出CSV

    表  4   界面抗剪强度

    Table  4   Interface shear strengths

    项目试件编号
    123
    抗剪强度σn=200 kPa179.0500224.2300264.8700
    σn=400 kPa356.9700401.5600460.8900
    σn=600 kPa490.3700536.6700575.6700
    σn=800 kPa605.5600694.8200794.5600
    粗糙度0.39900.43100.4620
    相关系数R0.98990.99750.9874
    表观黏聚力/kPa54.750077.600098.0400
    内摩擦角/(°)35.240037.720040.4300
    下载: 导出CSV
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  • 收稿日期:  2020-01-07
  • 网络出版日期:  2022-12-07
  • 刊出日期:  2020-09-30

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