合肥工业大学土木与水利工程学院;
为了探究动静组合加载条件下岩样长径比对其强度及破坏形态的影响,先基于岩石动力学理论,阐释了SHPB试验中应力波传播的基本规律。随后,采用ANSYS/LS-DYNA有限元软件,对6组不同长径比试样开展了动静组合加载数值模拟,深入分析其应力-应变响应与破坏形态的演化规律。研究结果表明:动静组合加载下试样应力-应变曲线大致分线弹性阶段、破坏阶段与峰后阶段;长径比越大,破坏阶段的“上凹”现象越显著;当长径比n>0.8时,应力-应变曲线峰后阶段出现回弹。围压相同时,不同轴压下试样峰值应力总体上随长径比的增大而增大。轴压在20 MPa条件下,当围压低于一定阈值时,大长径比试样峰值应力会更高;而当围压大于该阈值,峰值应力与长径比关系不甚明显;围压的增加会抑制长径比对峰值应力的影响。在不同动静组合加载条件下,试样均以剪切破坏为主,端面边缘易出现碎块脱落,侧面可观测到剪切裂纹;随着长径比的增大,试样破坏程度逐渐降低,其侧面剪切裂纹数量也趋于减少。
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下载次数 | 被引频次 | 阅读次数 |
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基本信息:
DOI:10.13532/j.jmsce.cn10-1638/td.2024.04.012
中图分类号:TU45
引用信息:
[1]王诗杰,王志亮,封陈晨等.动静组合加载下长径比对岩样峰值应力与破坏形态影响研究[J].采矿与岩层控制工程学报,2024,6(04):130-140.DOI:10.13532/j.jmsce.cn10-1638/td.2024.04.012.
基金信息:
国家自然科学基金资助项目(12272119,U1965101)