本文主要研究内容
作者高旭（2019）在《地下水封洞库围岩非均质性及其参数刻画研究与应用》一文中研究指出：地下水封洞库常建于裂隙发育、地下水充裕的硬质花岗岩体中,受不同规模随机分布的岩体结构面影响,围岩参数不可避免地表现出强烈的非均质性或空间变异性。在水幕系统维持的高地下水压力作用下,围岩非均质性可能导致洞室局部出现灾难性的变形破坏现象,即围岩存在高失稳概率部位。而在实践中对岩体非均质性的有限认识严重制约了对围岩存在高失稳概率部位的识别工作,进而限制了支护设计的可靠程度。鉴于此,本论文以地下水封洞室非均质围岩岩体为研究对象,通过对围岩参数(渗透系数K_s、有效杨氏模量E′、有效粘聚力c′、有效内摩擦角φ′)的反演刻画研究,精准识别出围岩体存在的高失稳概率区域,进而提出针对性的支护方案。以宁波百地年地下水封洞库工程为实例,首先研究围岩各参数代表性体积单元(REV)尺寸效应和各向异性效应,阐明该水封洞室考虑围岩非均质性的必要性。利用掌握的勘察资料确定参数的无条件随机场统计特征,包括均值、方差、相关尺度,作为参数反演所需要的先验信息。然后,生成一组满足先验信息的参数随机场作为参考场,基于参考场进行正演计算以采集水头和位移信息。紧接着,在围岩参数与位移的空间互关联分析基础上,运用逐次线性评估原理建立水力层析扫描技术和位移反分析技术,融合采集的水头和位移信息分别来反演刻画渗透系数K_s和力学参数(E′、c′、φ′)的空间非均匀分布及其各参数的条件不确定性。接着,通过概率理论建立可行的失稳概率化评价方法,定量化地识别出围岩不同部位的失稳概率,从而反馈性地指示出洞室需要补强支护的具体位置。最后,提出了考虑围岩非均质性的地下水封洞室信息化施工技术途径。本论文取得的主要结论如下:(1)渗透系数REV和力学参数REV尺寸大小比洞室几何尺寸相差不大,不能采用等效连续均质模型,因此考虑围岩非均质性是有必要的。各参数的无条件随机场统计特征表明渗透系数的空间变异性程度明显大于力学参数的空间变异性。以结构面网络模型为基础,通过数值试验探索出渗透系数无条件随机场相关尺度与岩体结构面平均最大迹长基本相等,且结构面的优势方向将控制随机场的统计各向异性特征。反之,若结构面不存在优势方向,则参数随机场表现为统计各向同性。(2)围岩中一点处的位移与靠近该点位置的K_s、E′、c′、φ′都呈负相关关系,而只与远离该点位置的K_s呈正相关性。围岩位移受整个模型范围内渗透系数和有效杨氏模量的影响,但只对附近的强度参数(有效粘聚力和有效内摩擦角)具有相关性。另外,从互相关性数量级来说,位移对K_s的互相关性最大,对E′的互相关性最小,对c′和φ′的互相关性居中。(3)基于参考场的正演分析表明:由于存在着水幕系统维持的高地下水压力,且_sK的非均质性可以改变洞室周围渗透力分布,若只考虑力学参数的非均质性,则不能反映洞室开挖后真实的变形和稳定性状况。因此,在地下水封洞室开挖安全分析中同时考虑岩体水力学和力学性质的不均匀性具有重要实际意义。(4)利用水力层析扫描反演刻画K_s场,基于反演K_s场所评估的水力梯度场虽未能反映真实水力梯度场中每一个细部特征,但却把握住总体特征,尤其是水力梯度大的地方都刻画的非常清楚,从而明确了关键的渗透力荷载大小和分布情况。基于评估的渗透荷载,采用位移反分析技术反演刻画的E′场在有位移采样的部位与参考场的空间分布具有极高的相似性,但对于反演的c′场和φ′场仅在靠近洞周范围内被反演刻画出来。并且,越靠近监测点的围岩参数被描述得越清晰,解析度越高,所对应的条件不确定性也越小,代表对反演结果的可信度越高,这对围岩失稳概率评价极其重要。(5)通过一阶近似法分别基于参数先验信息和参数反演结果计算出围岩失稳概率分布。可以发现,如果仅仅依靠参数先验信息则会低估围岩失稳概率,而经过参数反演评估结果则可以相对精确的指示出高失稳概率区。基于识别出的高失稳概率区,提出针对性的锚固补强措施,比直接采用位移量大的传统判别指标来提出锚固补强措施,更能够起到优化设计的目的。
Abstract
de xia shui feng dong ku chang jian yu lie xi fa yo 、de xia shui chong yu de ying zhi hua gang yan ti zhong ,shou bu tong gui mo sui ji fen bu de yan ti jie gou mian ying xiang ,wei yan can shu bu ke bi mian de biao xian chu jiang lie de fei jun zhi xing huo kong jian bian yi xing 。zai shui mu ji tong wei chi de gao de xia shui ya li zuo yong xia ,wei yan fei jun zhi xing ke neng dao zhi dong shi ju bu chu xian zai nan xing de bian xing po huai xian xiang ,ji wei yan cun zai gao shi wen gai lv bu wei 。er zai shi jian zhong dui yan ti fei jun zhi xing de you xian ren shi yan chong zhi yao le dui wei yan cun zai gao shi wen gai lv bu wei de shi bie gong zuo ,jin er xian zhi le zhi hu she ji de ke kao cheng du 。jian yu ci ,ben lun wen yi de xia shui feng dong shi fei jun zhi wei yan yan ti wei yan jiu dui xiang ,tong guo dui wei yan can shu (shen tou ji shu K_s、you xiao yang shi mo liang E′、you xiao nian ju li c′、you xiao nei ma ca jiao φ′)de fan yan ke hua yan jiu ,jing zhun shi bie chu wei yan ti cun zai de gao shi wen gai lv ou yu ,jin er di chu zhen dui xing de zhi hu fang an 。yi ning bo bai de nian de xia shui feng dong ku gong cheng wei shi li ,shou xian yan jiu wei yan ge can shu dai biao xing ti ji chan yuan (REV)che cun xiao ying he ge xiang yi xing xiao ying ,chan ming gai shui feng dong shi kao lv wei yan fei jun zhi xing de bi yao xing 。li yong zhang wo de kan cha zi liao que ding can shu de mo tiao jian sui ji chang tong ji te zheng ,bao gua jun zhi 、fang cha 、xiang guan che du ,zuo wei can shu fan yan suo xu yao de xian yan xin xi 。ran hou ,sheng cheng yi zu man zu xian yan xin xi de can shu sui ji chang zuo wei can kao chang ,ji yu can kao chang jin hang zheng yan ji suan yi cai ji shui tou he wei yi xin xi 。jin jie zhao ,zai wei yan can shu yu wei yi de kong jian hu guan lian fen xi ji chu shang ,yun yong zhu ci xian xing ping gu yuan li jian li shui li ceng xi sao miao ji shu he wei yi fan fen xi ji shu ,rong ge cai ji de shui tou he wei yi xin xi fen bie lai fan yan ke hua shen tou ji shu K_she li xue can shu (E′、c′、φ′)de kong jian fei jun yun fen bu ji ji ge can shu de tiao jian bu que ding xing 。jie zhao ,tong guo gai lv li lun jian li ke hang de shi wen gai lv hua ping jia fang fa ,ding liang hua de shi bie chu wei yan bu tong bu wei de shi wen gai lv ,cong er fan kui xing de zhi shi chu dong shi xu yao bu jiang zhi hu de ju ti wei zhi 。zui hou ,di chu le kao lv wei yan fei jun zhi xing de de xia shui feng dong shi xin xi hua shi gong ji shu tu jing 。ben lun wen qu de de zhu yao jie lun ru xia :(1)shen tou ji shu REVhe li xue can shu REVche cun da xiao bi dong shi ji he che cun xiang cha bu da ,bu neng cai yong deng xiao lian xu jun zhi mo xing ,yin ci kao lv wei yan fei jun zhi xing shi you bi yao de 。ge can shu de mo tiao jian sui ji chang tong ji te zheng biao ming shen tou ji shu de kong jian bian yi xing cheng du ming xian da yu li xue can shu de kong jian bian yi xing 。yi jie gou mian wang lao mo xing wei ji chu ,tong guo shu zhi shi yan tan suo chu shen tou ji shu mo tiao jian sui ji chang xiang guan che du yu yan ti jie gou mian ping jun zui da ji chang ji ben xiang deng ,ju jie gou mian de you shi fang xiang jiang kong zhi sui ji chang de tong ji ge xiang yi xing te zheng 。fan zhi ,re jie gou mian bu cun zai you shi fang xiang ,ze can shu sui ji chang biao xian wei tong ji ge xiang tong xing 。(2)wei yan zhong yi dian chu de wei yi yu kao jin gai dian wei zhi de K_s、E′、c′、φ′dou cheng fu xiang guan guan ji ,er zhi yu yuan li gai dian wei zhi de K_scheng zheng xiang guan xing 。wei yan wei yi shou zheng ge mo xing fan wei nei shen tou ji shu he you xiao yang shi mo liang de ying xiang ,dan zhi dui fu jin de jiang du can shu (you xiao nian ju li he you xiao nei ma ca jiao )ju you xiang guan xing 。ling wai ,cong hu xiang guan xing shu liang ji lai shui ,wei yi dui K_sde hu xiang guan xing zui da ,dui E′de hu xiang guan xing zui xiao ,dui c′he φ′de hu xiang guan xing ju zhong 。(3)ji yu can kao chang de zheng yan fen xi biao ming :you yu cun zai zhao shui mu ji tong wei chi de gao de xia shui ya li ,ju _sKde fei jun zhi xing ke yi gai bian dong shi zhou wei shen tou li fen bu ,re zhi kao lv li xue can shu de fei jun zhi xing ,ze bu neng fan ying dong shi kai wa hou zhen shi de bian xing he wen ding xing zhuang kuang 。yin ci ,zai de xia shui feng dong shi kai wa an quan fen xi zhong tong shi kao lv yan ti shui li xue he li xue xing zhi de bu jun yun xing ju you chong yao shi ji yi yi 。(4)li yong shui li ceng xi sao miao fan yan ke hua K_schang ,ji yu fan yan K_schang suo ping gu de shui li ti du chang sui wei neng fan ying zhen shi shui li ti du chang zhong mei yi ge xi bu te zheng ,dan que ba wo zhu zong ti te zheng ,you ji shi shui li ti du da de de fang dou ke hua de fei chang qing chu ,cong er ming que le guan jian de shen tou li he zai da xiao he fen bu qing kuang 。ji yu ping gu de shen tou he zai ,cai yong wei yi fan fen xi ji shu fan yan ke hua de E′chang zai you wei yi cai yang de bu wei yu can kao chang de kong jian fen bu ju you ji gao de xiang shi xing ,dan dui yu fan yan de c′chang he φ′chang jin zai kao jin dong zhou fan wei nei bei fan yan ke hua chu lai 。bing ju ,yue kao jin jian ce dian de wei yan can shu bei miao shu de yue qing xi ,jie xi du yue gao ,suo dui ying de tiao jian bu que ding xing ye yue xiao ,dai biao dui fan yan jie guo de ke xin du yue gao ,zhe dui wei yan shi wen gai lv ping jia ji ji chong yao 。(5)tong guo yi jie jin shi fa fen bie ji yu can shu xian yan xin xi he can shu fan yan jie guo ji suan chu wei yan shi wen gai lv fen bu 。ke yi fa xian ,ru guo jin jin yi kao can shu xian yan xin xi ze hui di gu wei yan shi wen gai lv ,er jing guo can shu fan yan ping gu jie guo ze ke yi xiang dui jing que de zhi shi chu gao shi wen gai lv ou 。ji yu shi bie chu de gao shi wen gai lv ou ,di chu zhen dui xing de mao gu bu jiang cuo shi ,bi zhi jie cai yong wei yi liang da de chuan tong pan bie zhi biao lai di chu mao gu bu jiang cuo shi ,geng neng gou qi dao you hua she ji de mu de 。
论文参考文献
论文详细介绍
论文作者分别是来自中国地质大学的高旭，发表于刊物中国地质大学2019-09-24论文，是一篇关于围岩论文,非均质性论文,参数反演论文,失稳概率论文,锚固支护论文,中国地质大学2019-09-24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，资料来自中国地质大学2019-09-24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：围岩论文; 非均质性论文; 参数反演论文; 失稳概率论文; 锚固支护论文; 中国地质大学2019-09-24论文;