本文主要研究内容
作者罗可(2019)在《加载速率影响的含裂隙类岩石材料破断试验与数值模拟》一文中研究指出:为了探索加载速率对裂隙岩体强度规律、变形特征及能量演化的影响,分析加载速率与裂隙倾角复合因素影响下裂隙岩体破断响应规律及能量演化机理,本文以预埋铝合金薄片方法于室内制备含不同倾角裂隙类岩石试件,基于RMT–150B对其进行0.1kN/s、0.2kN/s、0.5kN/s、1.0 kN/s四级加载速率下的单轴压缩试验,为弥补室内试验测试技术在反映裂隙体微观形态上的不足,运用PFC2D数值计算平台,基于平直节理接触单元构建裂隙体数值分析模型,设定与室内试验测试环境相同的边界条件,对比完整试件变形破坏特征数据,标定数值模型细观力学参数。本文主要研究结果表明:(1)在静态加载条件下,类岩石试件峰值强度对应应变量与加载速率表现出负相关性,相同裂隙倾角下,裂隙试样峰值强度随加载速率的增加呈现出非线性增大的规律,但其增大速率逐渐减小。(2)相同加载速率下,裂隙类岩石试件峰值强度随裂隙倾角增大呈现先减小后增大的趋势,其中15°倾角裂隙体试件峰值强度最小,当倾角为75°和90°时裂隙体峰值强度接近于完整试件强度,表明大倾角裂隙对类岩石试件的损伤劣化作用较弱,特别是90°倾角裂隙体试件,加载速率和裂隙倾角对其峰值强度的影响规律与完整试件几乎相同。(3)裂隙体弹性模量同时受裂隙倾角和加载速率的影响,并随裂隙倾角的增大而近似线性增大,随加载速率的增加而非线性增大,并趋近于一个常数。(4)数值模拟试验过程中的裂隙尖端应力响应规律表明:相同加载速率下,应力–应变关系曲线跌落前,15°倾角裂隙尖端应力大于其他倾角裂隙尖端应力;裂隙尖端法向应力和切向应力随裂隙倾角增大而呈现不同的变化规律:法向应力减小而切向应力增大。(5)峰值强度处,裂隙体储存弹性应变能的能力随加载速率的增加而增强,而耗散应变能则随加载速率的增加而减弱。峰值后裂隙体弹性应变能仍有积聚,但积聚弹性应变能的能力随加载速率增大而减弱。(6)裂隙体耗散应变能转化速率在峰值前处于较低水平,在峰值后伴随宏观破裂面的贯通而急剧增加;加载速率对裂隙体损伤程度有所不同,其对应损伤因子随加载速率增大而减小。加载速率影响的裂隙体损伤因子变化规律与能量演化进程规律相一致,表明裂隙体内部能量演化进程与其破坏规律之间具有内在联系。
Abstract
wei le tan suo jia zai su lv dui lie xi yan ti jiang du gui lv 、bian xing te zheng ji neng liang yan hua de ying xiang ,fen xi jia zai su lv yu lie xi qing jiao fu ge yin su ying xiang xia lie xi yan ti po duan xiang ying gui lv ji neng liang yan hua ji li ,ben wen yi yu mai lv ge jin bao pian fang fa yu shi nei zhi bei han bu tong qing jiao lie xi lei yan dan shi jian ,ji yu RMT–150Bdui ji jin hang 0.1kN/s、0.2kN/s、0.5kN/s、1.0 kN/ssi ji jia zai su lv xia de chan zhou ya su shi yan ,wei mi bu shi nei shi yan ce shi ji shu zai fan ying lie xi ti wei guan xing tai shang de bu zu ,yun yong PFC2Dshu zhi ji suan ping tai ,ji yu ping zhi jie li jie chu chan yuan gou jian lie xi ti shu zhi fen xi mo xing ,she ding yu shi nei shi yan ce shi huan jing xiang tong de bian jie tiao jian ,dui bi wan zheng shi jian bian xing po huai te zheng shu ju ,biao ding shu zhi mo xing xi guan li xue can shu 。ben wen zhu yao yan jiu jie guo biao ming :(1)zai jing tai jia zai tiao jian xia ,lei yan dan shi jian feng zhi jiang du dui ying ying bian liang yu jia zai su lv biao xian chu fu xiang guan xing ,xiang tong lie xi qing jiao xia ,lie xi shi yang feng zhi jiang du sui jia zai su lv de zeng jia cheng xian chu fei xian xing zeng da de gui lv ,dan ji zeng da su lv zhu jian jian xiao 。(2)xiang tong jia zai su lv xia ,lie xi lei yan dan shi jian feng zhi jiang du sui lie xi qing jiao zeng da cheng xian xian jian xiao hou zeng da de qu shi ,ji zhong 15°qing jiao lie xi ti shi jian feng zhi jiang du zui xiao ,dang qing jiao wei 75°he 90°shi lie xi ti feng zhi jiang du jie jin yu wan zheng shi jian jiang du ,biao ming da qing jiao lie xi dui lei yan dan shi jian de sun shang lie hua zuo yong jiao ruo ,te bie shi 90°qing jiao lie xi ti shi jian ,jia zai su lv he lie xi qing jiao dui ji feng zhi jiang du de ying xiang gui lv yu wan zheng shi jian ji hu xiang tong 。(3)lie xi ti dan xing mo liang tong shi shou lie xi qing jiao he jia zai su lv de ying xiang ,bing sui lie xi qing jiao de zeng da er jin shi xian xing zeng da ,sui jia zai su lv de zeng jia er fei xian xing zeng da ,bing qu jin yu yi ge chang shu 。(4)shu zhi mo ni shi yan guo cheng zhong de lie xi jian duan ying li xiang ying gui lv biao ming :xiang tong jia zai su lv xia ,ying li –ying bian guan ji qu xian die la qian ,15°qing jiao lie xi jian duan ying li da yu ji ta qing jiao lie xi jian duan ying li ;lie xi jian duan fa xiang ying li he qie xiang ying li sui lie xi qing jiao zeng da er cheng xian bu tong de bian hua gui lv :fa xiang ying li jian xiao er qie xiang ying li zeng da 。(5)feng zhi jiang du chu ,lie xi ti chu cun dan xing ying bian neng de neng li sui jia zai su lv de zeng jia er zeng jiang ,er hao san ying bian neng ze sui jia zai su lv de zeng jia er jian ruo 。feng zhi hou lie xi ti dan xing ying bian neng reng you ji ju ,dan ji ju dan xing ying bian neng de neng li sui jia zai su lv zeng da er jian ruo 。(6)lie xi ti hao san ying bian neng zhuai hua su lv zai feng zhi qian chu yu jiao di shui ping ,zai feng zhi hou ban sui hong guan po lie mian de guan tong er ji ju zeng jia ;jia zai su lv dui lie xi ti sun shang cheng du you suo bu tong ,ji dui ying sun shang yin zi sui jia zai su lv zeng da er jian xiao 。jia zai su lv ying xiang de lie xi ti sun shang yin zi bian hua gui lv yu neng liang yan hua jin cheng gui lv xiang yi zhi ,biao ming lie xi ti nei bu neng liang yan hua jin cheng yu ji po huai gui lv zhi jian ju you nei zai lian ji 。
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论文作者分别是来自南华大学的罗可,发表于刊物南华大学2019-10-28论文,是一篇关于加载速率论文,类岩石试件论文,应变能论文,强度规律论文,变形特征论文,数值模拟论文,南华大学2019-10-28论文的文章。本文可供学术参考使用,各位学者可以免费参考阅读下载,文章观点不代表本站观点,资料来自南华大学2019-10-28论文网站,若本站收录的文献无意侵犯了您的著作版权,请联系我们删除。
标签:加载速率论文; 类岩石试件论文; 应变能论文; 强度规律论文; 变形特征论文; 数值模拟论文; 南华大学2019-10-28论文;