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2024 04 v.6;No.25 91-101
加锚岩体结构面抗剪强度尺寸效应试验及机理研究
基金项目(Foundation): 国家自然科学基金资助项目(42107177,42277147);; 浙江省自然科学基金资助项目(LQ20E040002)
邮箱(Email): 15029755833@163.com;
DOI: 10.13532/j.jmsce.cn10-1638/td.2024.04.010
中文作者单位:

宁波大学岩石力学研究所;绍兴文理学院土木工程学院;

摘要(Abstract):

为揭示加锚岩体结构面抗剪强度尺寸效应机理,开展了系列尺寸(100~400 mm)加锚结构面室内剪切试验,对比分析结构面锚固前后抗剪强度及锚杆抗剪力的变化规律,研究了锚杆和结构面的变形破坏特征。研究结果表明:(1)结构面锚固前后抗剪强度均呈负尺寸效应,且尺寸效应随着法向应力增加而逐渐减弱;锚杆抗剪力随着结构面尺寸增加呈非线性增加。(2)锚杆呈“S”形变形特征,变形角度、剪切变形量和轴向变形量随着结构面尺寸增加呈非线性增加;结构面受锚杆挤压发生破裂的程度随着结构面尺寸增加而减弱。(3)引用“锚杆作用面积”概念,结构面尺寸较小时,锚杆作用面积超出结构面产生“边缘效应”,导致锚杆未充分发挥抗剪性能;随着结构面尺寸增大,锚杆性能得到充分发挥,锚杆抗剪力先迅速增加后保持稳定。

关键词(KeyWords): 锚固结构面;;抗剪强度;;尺寸效应;;锚杆变形;;锚杆作用面积
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基本信息:

DOI:10.13532/j.jmsce.cn10-1638/td.2024.04.010

中图分类号:TU45

引用信息:

[1]刘广建,王志成,罗战友等.加锚岩体结构面抗剪强度尺寸效应试验及机理研究[J].采矿与岩层控制工程学报,2024,6(04):91-101.DOI:10.13532/j.jmsce.cn10-1638/td.2024.04.010.

基金信息:

国家自然科学基金资助项目(42107177,42277147);; 浙江省自然科学基金资助项目(LQ20E040002)

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