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自反力双剪面大型剪切仪研发及应用研究

龚辉 郭娜娜 葛邦云

龚辉, 郭娜娜, 葛邦云. 自反力双剪面大型剪切仪研发及应用研究[J]. 水文地质工程地质, 2021, 48(5): 168-175. doi: 10.16030/j.cnki.issn.1000-3665.202012039
引用本文: 龚辉, 郭娜娜, 葛邦云. 自反力双剪面大型剪切仪研发及应用研究[J]. 水文地质工程地质, 2021, 48(5): 168-175. doi: 10.16030/j.cnki.issn.1000-3665.202012039
GONG Hui, GUO Nana, GE Bangyun. Application and research on large in-situ self-reacting direct shear apparatus owning two shear interfaces[J]. Hydrogeology & Engineering Geology, 2021, 48(5): 168-175. doi: 10.16030/j.cnki.issn.1000-3665.202012039
Citation: GONG Hui, GUO Nana, GE Bangyun. Application and research on large in-situ self-reacting direct shear apparatus owning two shear interfaces[J]. Hydrogeology & Engineering Geology, 2021, 48(5): 168-175. doi: 10.16030/j.cnki.issn.1000-3665.202012039

自反力双剪面大型剪切仪研发及应用研究

doi: 10.16030/j.cnki.issn.1000-3665.202012039
基金项目: 国家自然科学基金项目(41630643);国家自然科学基金面上项目(41272305)
详细信息
    作者简介:

    龚辉(1986-),男,博士研究生,高级工程师,主要研究方向为土石混合料工程特性研究、岩土试验检测新技术。E-mail:354129582@qq.com

  • 中图分类号: TU473.1

Application and research on large in-situ self-reacting direct shear apparatus owning two shear interfaces

  • 摘要: 原位直剪是测定土石混合料强度参数最为普遍也是最可靠的试验方法之一,但是现有原位直剪仪在试验过程中存在法向加压系统不合理、无法预留剪切缝等多方面的缺陷,影响试验结果的精度。本文对传统原位剪切仪进行有针对性的改造,研制出自反力双剪面大型剪切仪,该大型原位直剪仪有以下特点:(1)设备自身提供水平反力;(2)剪切过程中垂向加压系统固定,无需滚轴排;(3)剪切盒之间可预留可调节宽度的剪切缝,适用性更广;(4)装置模块化程度高,便于搬运、组装和拆卸。通过与单环剪切仪进行现场对比试验发现,与单环剪切仪得到的试验结果相比,自反力双剪面大型剪切仪得到的剪应力-剪切位移曲线为标准双曲线,并且可得到大剪切位移情况下的剪切曲线,通过大剪切位移曲线读取的最大剪应力更贴合实际。与单环剪切仪得到的抗剪强度值相比,内摩擦角低4.6°,而黏聚力高41.14 kPa。同时通过对两种剪切仪得到的剪切破坏面进行图像对照,可明显发现自反力双剪面大型剪切仪得到的剪切破坏面较为平整,未出现单环剪切仪对的剪切破坏面下凹现象。
  • 图  1  单环直剪仪示意图

    Figure  1.  Schematic diagrams of the single-box direct shear instrument

    图  2  普通双环直剪仪示意图

    Figure  2.  Schematic diagram of common double-box direct shear instrument

    图  3  双环自平衡直剪仪示意图

    Figure  3.  Schematic diagram of the self-balanced double-box direct shear instrument

    图  4  实际剪切破坏面示意图

    Figure  4.  Actual shear failure interface

    图  5  顶部自由的剪力引起的力偶(a)及试样受力简图(b)

    Figure  5.  Stresses and couples induced by shear force

    图  6  双剪面自反力大型原位直剪仪正视图(a)及实体仪器(b)

    Figure  6.  Front view and photo for the large self-reacting direct shear apparatus owning two shear interfaces

    图  7  侧导轨大样图

    Figure  7.  Schematic diagram of side rail

    图  8  各剪切环和试样受力简图

    Figure  8.  Diagram of force(stresses)for shear boxes and test samples

    图  9  自反力双剪面大型剪切仪应用现场试样修整图

    Figure  9.  Field sample modification diagram of new shear apparatus application

    图  10  单环剪切仪剪切应力-位移曲线

    Figure  10.  Shear stress-displacement curves for the single-box shear apparatus

    图  11  自反力双剪面大型剪切仪剪切应力-位移曲线

    Figure  11.  Shear stress-displacement curves for new shear apparatus self-reacting direct shear owning two shear interfaces

    图  12  强度参数拟合对比

    Figure  12.  Compassion between strength parameter fittings of two shear apparatuses

    图  13  单环剪切仪得到的典型剪切破坏面

    Figure  13.  Shear failure interface attained through the single box apparatus

    图  14  自反力双剪面大型剪切仪得到的典型剪切破坏面

    Figure  14.  Shear failure interface attained through self-balanced in-situ shear equipment owning two shear interfaces

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出版历程
  • 收稿日期:  2020-12-18
  • 修回日期:  2021-01-26
  • 网络出版日期:  2021-09-09
  • 刊出日期:  2021-09-10

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