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2024 03 v.6;No.24 108-117
等效非均匀荷载条件下梯形截面岩石力学特性试验研究
基金项目(Foundation): 国家自然科学基金资助项目(52174076);; 湖南省自然科学基金资助项目(2023JJ30261)
邮箱(Email): 1042400113@qq.com;
DOI: 10.13532/j.jmsce.cn10-1638/td.2024.03.001
中文作者单位:

湖南科技大学资源环境与安全工程学院;湖南科技大学煤炭资源清洁利用与矿山环境保护湖南省重点实验室;湖南科技大学煤矿安全开采技术湖南省重点实验室;

摘要(Abstract):

基于巷道开挖过程中围岩应力转移分布特点,着重探究非均匀荷载下岩体变形规律。提出了新的岩石力学试验方法,该方法根据岩石应力–应变曲线,加工出特定的梯形截面试件及相应的刚性垫片,以实现单轴压缩时的轴向荷载非均匀分布。计算了梯形截面试件压缩时荷载分布与截面高度的关系,并对试验条件下的试件应力分布与岩石状态分区进行讨论,在右侧面高度为75 mm时试件破坏前左侧面处于塑性变形阶段,在右侧面高度为85 mm时试件破坏前左侧面仍处于弹性变形阶段。得到了非均匀荷载压缩条件下单一完整岩体的变形特性;梯形截面砂岩破坏前有明显的分区,各点位塑性硬化程度不一致,S85试件点位3右侧处塑性硬化程度最大,S75试件点位2右侧处塑性硬化程度最大。试验结果表明,非均匀荷载压缩条件下的岩石呈非线性变形特征;同时,岩石局部的损伤会加快附近岩石的塑性软化。提出了非均匀荷载条件下不同竖向截面内轴向应变差会引起附加切应力,附加切应力在中性面上、下方向相反,大小与应变变化率成正相关。在附加切应力作用下,岩石单元最大剪应力平面角度增大,试件破坏形态由原本对“核”形态转变为沿着斜面倾向拉长的相对棱台状。

关键词(KeyWords): 岩石力学;;非均匀荷载;;单轴压缩;;CT扫描;;变形与破坏
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基本信息:

DOI:10.13532/j.jmsce.cn10-1638/td.2024.03.001

中图分类号:TD315

引用信息:

[1]余伟健,潘豹,吴根水等.等效非均匀荷载条件下梯形截面岩石力学特性试验研究[J].采矿与岩层控制工程学报,2024,6(03):108-117.DOI:10.13532/j.jmsce.cn10-1638/td.2024.03.001.

基金信息:

国家自然科学基金资助项目(52174076);; 湖南省自然科学基金资助项目(2023JJ30261)

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