本文主要研究内容
作者袁伟（2019）在《具有轴向静载的变截面岩石应力波传播特性》一文中研究指出：针对天然岩块几何形貌复杂、岩体遭受地应力作用的工程实际,为了爆破施工中能够达到最佳破岩效果和便于围岩稳定性分析,研究了具有轴向静载的变截面岩石应力波传播特性。首先,通过理论分析,研究了由于杆件发生弹性变形,轴向静载对阶梯型杆的透射系数和连续变截面杆的应力波传播系数的影响。结果表明:轴向静载能够增强应力波在变截面杆中的传播能力;变截面率、弹性模量、泊松比决定了杆件的初始变形大小,进而影响了应力波的传播。其次,基于弹性杆的分析结果,考虑岩石密度、动态弹性模量、纵波波速与初始应力的关系,分别建立了阶梯型岩石和连续变截面岩石的应力波传播模型,研究了由于轴向静载导致岩石发生不同程度的初始变形,岩石应力波的透射系数和幅值衰减的演化规律。结果表明:轴向静载显著影响应力波的时域和频域传播衰减特征,随轴向静载的增大,阶梯型岩石应力波幅值的透射系数和连续变截面岩石的幅值衰减系数均表现为“先减小后增大”;轴向静载、岩石几何形貌、变截面率共同决定了幅值衰减系数大小及其空间变化特征。然后,设计并开展了具有轴向静载变截面红砂岩的应力波传播实验,研究了初始应力和变截面共同对应力波波形、幅值空间衰减及频率相关性等特性的影响,与理论结果进行了定性对比。结果表明:静应力越大,应力波波形下降沿越陡,卸载应力峰值越大。同一测点幅值随静应力的增大而先快速减小后缓慢变化。随静应力的增加,响应幅值和幅值衰减系数均先快速减小,后缓慢变化。响应幅值对红砂岩的变截面率变化不敏感,而幅值衰减系数随静应力的变化率与变截面率呈正相关。在频域内,随着静应力的增加,频谱图由陡变缓,各频率波的幅值也呈现由快速减小到缓慢变化的特征,低频波幅值受静应力的影响更为明显。最后,基于理论、实验和数值计算三方面的研究结果,探索了具有轴向静载下变截面岩石的应力波幅值衰减机理。具有轴向静载下变截面岩石的应力波幅值衰减分为几何衰减和物理衰减,几何衰减与初始应力和扰动幅值均无关,初始应力影响岩石的物理衰减。岩石的几何特征决定微孔隙、静应力沿轴向的分布,静应力又决定了岩石孔隙的压密程度。孔隙压密程度是决定应力波能量衰减的本质因素,几何特性和初始应力均是导致岩石应力波传播规律改变的直接原因。
Abstract
zhen dui tian ran yan kuai ji he xing mao fu za 、yan ti zao shou de ying li zuo yong de gong cheng shi ji ,wei le bao po shi gong zhong neng gou da dao zui jia po yan xiao guo he bian yu wei yan wen ding xing fen xi ,yan jiu le ju you zhou xiang jing zai de bian jie mian yan dan ying li bo chuan bo te xing 。shou xian ,tong guo li lun fen xi ,yan jiu le you yu gan jian fa sheng dan xing bian xing ,zhou xiang jing zai dui jie ti xing gan de tou she ji shu he lian xu bian jie mian gan de ying li bo chuan bo ji shu de ying xiang 。jie guo biao ming :zhou xiang jing zai neng gou zeng jiang ying li bo zai bian jie mian gan zhong de chuan bo neng li ;bian jie mian lv 、dan xing mo liang 、bo song bi jue ding le gan jian de chu shi bian xing da xiao ,jin er ying xiang le ying li bo de chuan bo 。ji ci ,ji yu dan xing gan de fen xi jie guo ,kao lv yan dan mi du 、dong tai dan xing mo liang 、zong bo bo su yu chu shi ying li de guan ji ,fen bie jian li le jie ti xing yan dan he lian xu bian jie mian yan dan de ying li bo chuan bo mo xing ,yan jiu le you yu zhou xiang jing zai dao zhi yan dan fa sheng bu tong cheng du de chu shi bian xing ,yan dan ying li bo de tou she ji shu he fu zhi cui jian de yan hua gui lv 。jie guo biao ming :zhou xiang jing zai xian zhe ying xiang ying li bo de shi yu he pin yu chuan bo cui jian te zheng ,sui zhou xiang jing zai de zeng da ,jie ti xing yan dan ying li bo fu zhi de tou she ji shu he lian xu bian jie mian yan dan de fu zhi cui jian ji shu jun biao xian wei “xian jian xiao hou zeng da ”;zhou xiang jing zai 、yan dan ji he xing mao 、bian jie mian lv gong tong jue ding le fu zhi cui jian ji shu da xiao ji ji kong jian bian hua te zheng 。ran hou ,she ji bing kai zhan le ju you zhou xiang jing zai bian jie mian gong sha yan de ying li bo chuan bo shi yan ,yan jiu le chu shi ying li he bian jie mian gong tong dui ying li bo bo xing 、fu zhi kong jian cui jian ji pin lv xiang guan xing deng te xing de ying xiang ,yu li lun jie guo jin hang le ding xing dui bi 。jie guo biao ming :jing ying li yue da ,ying li bo bo xing xia jiang yan yue dou ,xie zai ying li feng zhi yue da 。tong yi ce dian fu zhi sui jing ying li de zeng da er xian kuai su jian xiao hou huan man bian hua 。sui jing ying li de zeng jia ,xiang ying fu zhi he fu zhi cui jian ji shu jun xian kuai su jian xiao ,hou huan man bian hua 。xiang ying fu zhi dui gong sha yan de bian jie mian lv bian hua bu min gan ,er fu zhi cui jian ji shu sui jing ying li de bian hua lv yu bian jie mian lv cheng zheng xiang guan 。zai pin yu nei ,sui zhao jing ying li de zeng jia ,pin pu tu you dou bian huan ,ge pin lv bo de fu zhi ye cheng xian you kuai su jian xiao dao huan man bian hua de te zheng ,di pin bo fu zhi shou jing ying li de ying xiang geng wei ming xian 。zui hou ,ji yu li lun 、shi yan he shu zhi ji suan san fang mian de yan jiu jie guo ,tan suo le ju you zhou xiang jing zai xia bian jie mian yan dan de ying li bo fu zhi cui jian ji li 。ju you zhou xiang jing zai xia bian jie mian yan dan de ying li bo fu zhi cui jian fen wei ji he cui jian he wu li cui jian ,ji he cui jian yu chu shi ying li he rao dong fu zhi jun mo guan ,chu shi ying li ying xiang yan dan de wu li cui jian 。yan dan de ji he te zheng jue ding wei kong xi 、jing ying li yan zhou xiang de fen bu ,jing ying li you jue ding le yan dan kong xi de ya mi cheng du 。kong xi ya mi cheng du shi jue ding ying li bo neng liang cui jian de ben zhi yin su ,ji he te xing he chu shi ying li jun shi dao zhi yan dan ying li bo chuan bo gui lv gai bian de zhi jie yuan yin 。
论文参考文献
论文详细介绍
论文作者分别是来自江西理工大学的袁伟，发表于刊物江西理工大学2019-09-23论文，是一篇关于应力波论文,轴向静载论文,变截面论文,透射系数论文,幅值衰减论文,江西理工大学2019-09-23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，资料来自江西理工大学2019-09-23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：应力波论文; 轴向静载论文; 变截面论文; 透射系数论文; 幅值衰减论文; 江西理工大学2019-09-23论文;