本文主要研究内容
作者许多,吴世勇,张茹,张泽天,周济芳,邓建辉,任利,吴斐（2019）在《锦屏深部大理岩蠕变特性及分数阶蠕变模型》一文中研究指出：为保障锦屏地下实验室(CJPL)硐室群的长期稳定性,开展2 400 m深埋大理岩蠕变特性的研究,在常规三轴压缩试验的基础上进行分级加载蠕变试验,系统分析了大理岩蠕变过程中的轴向与环向变形规律及不同围压(5 MPa和64 MPa)下大理岩蠕变特征差异,采用等时应力-应变曲线法确定了大理岩的长期强度,并基于分数阶导数改进了大理岩蠕变模型。研究表明:13,27 MPa围压下,大理岩轴向应力应变曲线达到峰值应力后快速跌落,40,53,64 MPa围压下,峰值应力附近的应变曲线呈现明显的平台段,表明CJPL深部大理岩变形行为随着围压的增加具有由脆性向延性转化的趋势;无论是低围压还是高围压,相比于低应力水平,高应力水平下大理岩更容易发生蠕变变形且环向蠕变现象更加显著,蠕变过程中的扩容现象也更加明显,试样破坏时64 MPa围压条件下的体积蠕变变形为5 MPa围压下的16. 3倍;在蠕变加载过程中,大理岩变形模量均为先增加后减小。变形模量增加阶段,高围压下增加幅度较低围压小,64 MPa围压下试样变形模量增加的幅值为1. 8 GPa,小于5 MPa围压下的3. 6 GPa,表明试样受高围压作用已经部分压密。随着应力水平的增大,变形模量减小,高围压下减小幅度较低围压更大,围压64 MPa下试样变形模量减小幅值为9. 4 GPa,约为峰值变形模量的22%,围压5 MPa下试样减小幅值仅为1. 8 GPa,约为峰值变形模量的4%,表明高围压试样在破坏前裂纹的产生和扩展更为剧烈,岩石劣化程度更大;相同偏应力条件下,围压越大的试样蠕变速率越小,但破坏时变形更大且扩容现象显著,表明相同外荷载条件下,深部围岩赋存环境应力水平较高,变形难以收敛,易发生时效大变形破坏;围压为5,64 MPa时,采用等时应力-应变曲线法确定大理岩长期强度分别为170,290 MPa,为相应围压三轴压缩强度的82%,73%;基于分数阶导数,改进了大理岩黏弹塑性损伤蠕变模型,该模型具有形式简单同时能够很好的描述大理岩蠕变过程中的非线性加速特征的特点。
Abstract
wei bao zhang jin bing de xia shi yan shi (CJPL)dong shi qun de chang ji wen ding xing ,kai zhan 2 400 mshen mai da li yan ru bian te xing de yan jiu ,zai chang gui san zhou ya su shi yan de ji chu shang jin hang fen ji jia zai ru bian shi yan ,ji tong fen xi le da li yan ru bian guo cheng zhong de zhou xiang yu huan xiang bian xing gui lv ji bu tong wei ya (5 MPahe 64 MPa)xia da li yan ru bian te zheng cha yi ,cai yong deng shi ying li -ying bian qu xian fa que ding le da li yan de chang ji jiang du ,bing ji yu fen shu jie dao shu gai jin le da li yan ru bian mo xing 。yan jiu biao ming :13,27 MPawei ya xia ,da li yan zhou xiang ying li ying bian qu xian da dao feng zhi ying li hou kuai su die la ,40,53,64 MPawei ya xia ,feng zhi ying li fu jin de ying bian qu xian cheng xian ming xian de ping tai duan ,biao ming CJPLshen bu da li yan bian xing hang wei sui zhao wei ya de zeng jia ju you you cui xing xiang yan xing zhuai hua de qu shi ;mo lun shi di wei ya hai shi gao wei ya ,xiang bi yu di ying li shui ping ,gao ying li shui ping xia da li yan geng rong yi fa sheng ru bian bian xing ju huan xiang ru bian xian xiang geng jia xian zhe ,ru bian guo cheng zhong de kuo rong xian xiang ye geng jia ming xian ,shi yang po huai shi 64 MPawei ya tiao jian xia de ti ji ru bian bian xing wei 5 MPawei ya xia de 16. 3bei ;zai ru bian jia zai guo cheng zhong ,da li yan bian xing mo liang jun wei xian zeng jia hou jian xiao 。bian xing mo liang zeng jia jie duan ,gao wei ya xia zeng jia fu du jiao di wei ya xiao ,64 MPawei ya xia shi yang bian xing mo liang zeng jia de fu zhi wei 1. 8 GPa,xiao yu 5 MPawei ya xia de 3. 6 GPa,biao ming shi yang shou gao wei ya zuo yong yi jing bu fen ya mi 。sui zhao ying li shui ping de zeng da ,bian xing mo liang jian xiao ,gao wei ya xia jian xiao fu du jiao di wei ya geng da ,wei ya 64 MPaxia shi yang bian xing mo liang jian xiao fu zhi wei 9. 4 GPa,yao wei feng zhi bian xing mo liang de 22%,wei ya 5 MPaxia shi yang jian xiao fu zhi jin wei 1. 8 GPa,yao wei feng zhi bian xing mo liang de 4%,biao ming gao wei ya shi yang zai po huai qian lie wen de chan sheng he kuo zhan geng wei ju lie ,yan dan lie hua cheng du geng da ;xiang tong pian ying li tiao jian xia ,wei ya yue da de shi yang ru bian su lv yue xiao ,dan po huai shi bian xing geng da ju kuo rong xian xiang xian zhe ,biao ming xiang tong wai he zai tiao jian xia ,shen bu wei yan fu cun huan jing ying li shui ping jiao gao ,bian xing nan yi shou lian ,yi fa sheng shi xiao da bian xing po huai ;wei ya wei 5,64 MPashi ,cai yong deng shi ying li -ying bian qu xian fa que ding da li yan chang ji jiang du fen bie wei 170,290 MPa,wei xiang ying wei ya san zhou ya su jiang du de 82%,73%;ji yu fen shu jie dao shu ,gai jin le da li yan nian dan su xing sun shang ru bian mo xing ,gai mo xing ju you xing shi jian chan tong shi neng gou hen hao de miao shu da li yan ru bian guo cheng zhong de fei xian xing jia su te zheng de te dian 。
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论文作者分别是来自煤炭学报的许多,吴世勇,张茹,张泽天,周济芳,邓建辉,任利,吴斐，发表于刊物煤炭学报2019年05期论文，是一篇关于深部论文,大理岩论文,蠕变论文,长期强度论文,分数阶导数论文,煤炭学报2019年05期论文的文章。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，资料来自煤炭学报2019年05期论文网站，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。