| 基于FLAC-3D砂岩块体超低摩擦鞭梢效应研究北大核心CSCD |
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| 引用本文： | 李利萍,唐垒,潘一山,邰英楼,张海涛.基于FLAC-3D砂岩块体超低摩擦鞭梢效应研究北大核心CSCD[J].应用数学和力学,2022,43(3):300-311. |
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| 作者姓名： | 李利萍 唐垒 潘一山 邰英楼 张海涛 |
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| 作者单位： | 1.辽宁工程技术大学 力学与工程学院，辽宁 阜新 123000 |
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| 基金项目： | 国家自然科学基金（51974148）； |
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| 摘 要： | 随着矿山开采深度的持续增加,深部岩体力学行为呈现出新形式、新特征.广泛应用于建筑行业的鞭梢效应与深部岩体部分动力响应现象极为相似.故从结构特征出发,以砂岩块体为研究对象,工作块体(水平冲击作用块体)水平位移及加速度为参考指标,通过试验及FLAC-3D数值模拟计算的方式,探究工作块体“位置”及“尺寸”对其超低摩擦鞭梢效应影响机制.研究表明:系统产生超低摩擦鞭梢效应的难易程度与工作块体尺寸密切相关,模拟中工作块体边长为标准块体(边长100 mm立方体)边长2/5时,系统结构诱发超低摩擦鞭梢效应尤其显著;在一定范围内,工作块体所处位置距扰动源越远,超低摩擦鞭梢效应强度越大,当超过这一范围时,则会出现减小趋势,即超低摩擦鞭梢效应强度随工作块体与震源块体间距离呈先增后减关系.
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| 关 键 词： | 应力波扰动 砂岩块体 冲击地压 FLAC-3D 超低摩擦鞭梢效应 |
| 收稿时间： | 2021-04-20 |
Ultralow Friction Whipping Effects of Sandstone Blocks Based on FLAC-3D |
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| Affiliation: | 1.School of Mechanics and Engineering, Liaoning Technical University, Fuxin, Liaoning 123000, P.R.China2.School of Physics, Liaoning University, Shenyang 110036, P.R.China |
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| Abstract: | With the continual increase of mining depths, the mechanical behaviors of deep rock masses present new forms and new characteristics. The whipping effect widely used in the construction industry is very similar to the partial dynamic responses of deep rock masses. Based on the structural characteristics, with the sandstone blocks as the research object, and the horizontal displacement and acceleration of the working block (horizontally impacted block) as the reference indicators, by experiments and through FLAC-3D numerical simulations, the influential mechanisms of the working block positions and sizes on the ultralow friction whipping effects were investigated. The work shows that, the intensity of the system’s ultralow friction whipping effect is closely related to the size of the working block. In the simulation, when the side length of the working block is 2/5 of that of the standard block (with a cube side length of 100 mm), the system structure will induce particularly severe ultralow friction whipping effects; within a certain range, the farther the working block position is from the disturbance source, the greater the intensity of the ultralow friction whipping effect will be. Beyond this range, a decreasing trend will occur, that is, the ultralow friction whipping effect intensity will increase first and then decrease with the distance between the working block and the source block. |
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