颗粒材料粘滑现象及其物理机制的试验研究

刘建生; 熊文勇; 邓翔浩; 傅力; 童立红

doi:10.3969/j.issn.1007-2993.2023.04.013

颗粒材料粘滑现象及其物理机制的试验研究

doi: 10.3969/j.issn.1007-2993.2023.04.013

刘建生^{1, 2,},
熊文勇^{1, 2},
邓翔浩^{1, 2},
傅力³,
童立红^3, ,

1.
江西省交通工程集团有限公司，江西南昌　330028
2.
江西省桥梁智能养护工程技术研究中心，江西南昌　330028
3.
华东交通大学土木建筑学院岩土工程研究所，江西南昌　330013

基金项目: 江西省交通运输厅科技项目（2021H0004）；江西省教育厅课题（GJJ210618）；江西省科技合作专项项目(20212BDH81034)

详细信息

作者简介:
刘建生，男，1977年生，汉族，江西萍乡人，大学本科，高级工程师，从事公路工程管理。E-mail：724641276@qq.com

通讯作者:
童立红，男，1988年生，汉族，安徽淮南人，博士，教授，从事土动力学相关研究。E-mail：lhtong@ecjtu.edu.cn

中图分类号: TU 43
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- 文章访问数: 111
- HTML全文浏览量: 19
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- 被引次数: 0
出版历程
- 收稿日期: 2022-05-15
- 修回日期: 2022-07-31
- 录用日期: 2022-12-09
- 刊出日期: 2023-08-08

Experimental Study on the Stick-slip Phenomenon in Granular Materials and Its Physical Mechanism

Liu Jiansheng^{1, 2
,},
Xiong Wenyong^{1, 2},
Deng Xianghao^{1, 2},
Fu Li³,
Tong Lihong^{3
, ,}

1.
Jiangxi Transporation Engineering Group Co., Ltd., Nanchang 330028, Jiangxi, China
2.
Jiangxi Intelligent Maintenance Engineering Technology Research Center of Bridge, Nanchang 330028, Jiangxi, China
3.
Institute of Geotechnical Engineering, School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, Jiangxi, China

摘要

摘要: 颗粒材料系统在剪切过程中存在应力突变的情况，为了探究颗粒材料在剪切过程中的宏观力学响应与其细观参数的内在联系，通过室内直剪试验，研究了颗粒材料系统在受压剪作用下的粘滑（stick-slip）行为。将玻璃微珠作为颗粒材料进行了不同正应力下的直剪试验，并引入率态摩擦模型（RSF）对试验结果进行了定量分析，通过强度阶跃试验得到了率态摩擦模型相关参数。试验结果表明：（1）不同正应力下的粘滑曲线变化趋势基本相同，并呈现周期性的规律，但粘滑导致的应力降和周期随正应力的减小而减小；（2）在施加的压力范围内，通过计算得到其刚度比κ均小于1，且κ随正应力的增大而减小，这说明该颗粒材料满足失稳判据，试验现象与理论预测相符。成果为研究地震发生机理提供了思路，据此可推测断层的粘滑失稳及地震发生是由于断层面的滑移速度瞬时改变引起的，κ值越小其峰值粘滑速率越大，同时产生的应力降和粘滑周期越大。
- 颗粒材料粘滑现象 /
- 直剪试验 /
- 速率状态摩擦模型 /
- 失稳破坏模式
Abstract: In order to explore the internal relationship between the macro mechanical response of granular materials in the shear process and their micro parameters, the stick-slip behavior of granular materials under compression and shear was studied through indoor direct shear test. Glass beads were used as granular materials to conduct direct shear test under different normal stresses, and the rate state friction model (RSF) was introduced to quantitatively analyze the test results, and the relevant parameters of the rate state friction model were obtained through the strength step test. The experimental results show that: (1) the variation trend of the stick-slip curve under different normal stresses is basically the same and shows a periodic pattern, but the stress drop and period caused by stick-slip decrease with the decrease of normal stress; (2) within the applied pressure range, the stiffness ratio κ is calculated to be less than 1, and κ decreases with the increase of normal stress. This indicates that the granular material meets the instability criterion, and the experimental phenomenon is consistent with theoretical predictions. This provides ideas for studying the mechanism of earthquake occurrence, and based on this, it can be inferred that the stick-slip instability of faults and the cause of earthquakes are caused by the instantaneous change of slip velocity at the fault plane. The smaller the κ value, the greater the peak stick-slip rate, and the greater the stress drop and stick-slip period generated.
- particle stick-slip phenomenon /
- direct shear test /
- rate state friction model /
- instable destruction mode

HTML全文

图 1 试验仪器示意图

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图 2 稳态摩擦系数随速度从2 μm/s变为10 μm/s的响应情况

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图 3 颗粒材料粘滑状态曲线

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图 4 将每个失稳前的峰值用平滑曲线连接得到的应力–位移曲线

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图 5 平均应力降与正应力关系曲线

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图 6 粘滑平均滑移周期与正应力关系曲线

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图 7 刚度比$ \kappa $与正应力关系曲线，插图是通过剪应力–位移图(黑线)与线性拟合曲线(红色虚线)以获取$\kappa $值

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图 8 刚度比$ \kappa $与应力降关系曲线

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图 9 刚度比$ \kappa $与滑移周期关系曲线

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图 10 峰值滑移速率与刚度比$ \kappa $的关系，插图是摩擦系数$ \mu $与剪切位移关系图

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