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一种适用于细粒土的新型叠片式单剪仪研制与应用

朱俊高, 陈鸽, 王涛, 夏勇, 彭文明, 罗启迅

朱俊高, 陈鸽, 王涛, 夏勇, 彭文明, 罗启迅. 一种适用于细粒土的新型叠片式单剪仪研制与应用[J]. 岩土工程学报, 2024, 46(12): 2668-2674. DOI: 10.11779/CJGE20230876
引用本文: 朱俊高, 陈鸽, 王涛, 夏勇, 彭文明, 罗启迅. 一种适用于细粒土的新型叠片式单剪仪研制与应用[J]. 岩土工程学报, 2024, 46(12): 2668-2674. DOI: 10.11779/CJGE20230876
ZHU Jungao, CHEN Ge, WANG Tao, XIA Yong, PENG Wenming, LUO Qixun. A novel simple shear apparatus with stacked steel laminations for fine grained soil[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(12): 2668-2674. DOI: 10.11779/CJGE20230876
Citation: ZHU Jungao, CHEN Ge, WANG Tao, XIA Yong, PENG Wenming, LUO Qixun. A novel simple shear apparatus with stacked steel laminations for fine grained soil[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(12): 2668-2674. DOI: 10.11779/CJGE20230876

一种适用于细粒土的新型叠片式单剪仪研制与应用  English Version

基金项目: 

长江水科学研究联合基金重点支持项目 U2040221

华能集团总部科技项目 HNKJ20-H45

河海大学大型仪器设备共享基金项目 GX202205B

详细信息
    作者简介:

    朱俊高(1964—),男,博士,教授,博士生导师,主要从事土体基本性质及本构关系、土石坝工程研究。E-mail: zhujungao@hhu.edu.cn

    通讯作者:

    陈鸽, E-mail: chenge@hhu.edu.cn

  • 中图分类号: TU411

A novel simple shear apparatus with stacked steel laminations for fine grained soil

  • 摘要: 研制了一种适用于细粒土的新型叠片式单剪仪。该单剪仪试样室采用若干内部尺寸长×宽为100 mm×40 mm的回字形叠片,有效地减小了常规圆形叠环式单剪仪压力室剪切时试样侧倾、受力严重不均的问题。销钉式变形控制杆能使试样剪切变形均匀,叠片试样室外围的导向侧板控制了剪力的方向性,新型的杠杆支点结构有效解决杠杆倾斜时加载杆力传递变化的问题。该单剪仪结构稳定、易于操作,集应力/应变控制式功能于一身,可实现对细粒土的均匀剪切。基于该单剪仪对某黏土进行了抗剪强度和剪切蠕变试验,分析了黏土的抗剪强度参数和剪切蠕变规律,初步验证了该单剪仪的优良工作性能。
    Abstract: A new simple shear apparatus is invented for fine grained soil based on the existing designs. Some rectangular- stacked steel laminations are used for the new simple shear apparatus. The internal dimensions of the steel laminations are 100 mm in length and 40 mm in width. It effectively eliminates the common issues such as sample tilting and uneven stress distribution during shear testing compared to the conventional simple shear apparatuses. The pin type deformation control rod can ensure uniform shear deformation of the specimen. The guiding side plate around the specimen chamber controls the direction of the shear force. The new lever support structure effectively solves the problem of load rod force transmission because the lever is tilted. The simple shear apparatus is featured with stable structure and easy operation. It combines the stress/strain control functions into one unit, allowing for the uniform shear testing of fine-grained soils. The shear strength tests and shear creep tests on clay are carried out using the novel simple shear apparatus. Meanwhile, the parameters of shear strength and the laws of creep are analyzed. The test results validate the good performance of the novel simple shear apparatus.
  • 图  1   一般单剪仪受力及位移示意图

    Figure  1.   Schematic diagram of shear deformation in normal simple shear apparatus

    图  2   新型叠片式单剪仪

    Figure  2.   New simple shear apparatus

    图  3   试样盒结构示意图

    Figure  3.   Schematic diagram of structure of sample box

    图  4   叠片组示意图

    Figure  4.   Schematic diagram of stacked steel sheets

    图  5   杠杆支点及竖向传力结构(垂直于杠杆向)剖面图

    Figure  5.   Structural cross-section of vertical loading system

    图  6   小车底部与导轨的摩擦试验拟合曲线

    Figure  6.   Curve of frictional force for box and rail

    图  7   试验土体的颗粒级配曲线

    Figure  7.   Grain-size distribution curves of test soil

    图  8   土体在不同竖向压力下的应力应变曲线

    Figure  8.   Stress-strain curves of soil under different vertical pressures

    图  9   不同竖向压力下的抗剪强度

    Figure  9.   Shear strengths under different vertical pressures

    图  10   竖向压力100 kPa时的γ-t曲线

    Figure  10.   γ-t curves at vertical pressure of 100 kPa

    表  1   土体的基本物理力学参数

    Table  1   Fundamental physical-mechanical parameters of soil

    Gs w/% ρ/(g·cm-3) e wL/% wP/% Il Ip
    2.75 32.93 1.91 0.879 37.08 17.67 0.74 19.41
    下载: 导出CSV

    表  2   不同竖向固结压力下两组重复试验的抗剪强度

    Table  2   Shear strengths under different vertical pressures of two repeated tests

    竖向固结压力/kPa 抗剪强度/kPa 均值强度/kPa
    试验一 试验二
    100 65.7 65.8 65.8
    200 140.2 136.5 138.4
    500 310.8 312.8 311.8
    1000 494.1 481.9 488.0
    下载: 导出CSV

    表  3   不同竖向压力下小车底部的摩擦力

    Table  3   Frictional forces for box and rail at different vertical pressures

    固结应力/kPa 法向力/N 摩擦力/N 抗剪强度/kPa 剪力/N 摩擦力占比/%
    100 392 1.058 65.8 263.2 0.41
    200 784 2.117 138.4 553.6 0.38
    500 1960 5.292 311.8 1247.2 0.42
    1000 3920 10.584 488.0 1952.0 0.54
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-09-10
  • 网络出版日期:  2024-04-23
  • 刊出日期:  2024-11-30

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