發(fā)布時間：2018-04-13 05:03

  本文選題：巖爆預(yù)測 + 超低摩擦　； 參考：《重慶大學(xué)》2015年碩士論文

【摘要】：深部巖體往往具有非連續(xù)性和高地應(yīng)力的特點,在開挖卸荷作用下通常表現(xiàn)出與淺部巖體截然不同的行為。深部巖體開挖擾動的應(yīng)力波傳播能導(dǎo)致巖體中結(jié)構(gòu)面拉壓交替變化,即超低摩擦現(xiàn)象,進而引發(fā)巖爆。本文研究了超低摩擦效應(yīng)的特征,闡述了超低摩擦型巖爆的發(fā)生機理,并建立非連續(xù)塊巖爆預(yù)測模型,以工程實例為依托,開展巖爆定量化預(yù)測研究相關(guān)工作。主要研究工作如下:①通過建立深部巖體的一維非連續(xù)塊模型,得到任意時刻下塊體的位移、速度、加速度以及相鄰兩塊體的相對位移。在此模型基礎(chǔ)上探索了巖體中結(jié)構(gòu)面拉壓交替變化規(guī)律,揭示了深部巖體中超低摩擦效應(yīng)的存在,分析了其對巖層間破壞和運動的影響。②引入轉(zhuǎn)角自由度,建立深部巖體的二維非連續(xù)塊模型,通過塊體間相互作用力變化規(guī)律,得出在瞬時擾動力作用下各塊體的平動方程和轉(zhuǎn)動方程。借助顯式時域有限差分法,得到塊體間相對位移時程曲線,發(fā)現(xiàn)了在二維矩形隧洞圍巖中存在超低摩擦現(xiàn)象,并提出巖體中結(jié)構(gòu)面拉壓交替變化導(dǎo)致破壞從而引發(fā)巖爆的超低摩擦型巖爆發(fā)生機制。此外,通過參數(shù)分析研究了多種地質(zhì)力學(xué)參數(shù)對超低摩擦效應(yīng)的影響。③在深部巖體的二維非連續(xù)塊模型的基礎(chǔ)上建立巖爆預(yù)測模型來分析超低摩擦型巖爆的萌生過程和巖爆的烈度特征,并與傳統(tǒng)的經(jīng)驗性巖爆烈度分級準(zhǔn)則建立了對應(yīng)關(guān)系,驗證了巖爆模型對巖爆烈度預(yù)測的可行性。通過具體算例,分析地質(zhì)力學(xué)參數(shù)如地應(yīng)力中大小主應(yīng)力比值、大小主應(yīng)力大小等對巖爆的發(fā)生形式、范圍和烈度的影響。④將二維巖爆預(yù)測模型應(yīng)用于錦屏二級水電站施工排水洞工程中,對該工程的不同圍巖等級下洞室截面進行巖爆預(yù)測分析。通過與現(xiàn)場實測巖爆資料和UDEC模擬結(jié)果的對比,表明本文模型與實際工況較吻合,從而驗證了本文模型預(yù)測巖爆的準(zhǔn)確性。
[Abstract]:The deep rock mass is usually discontinuous and high ground stress, and the behavior of the deep rock mass is usually different from that of the shallow rock mass under the action of excavation and unloading.The propagation of stress wave caused by the disturbance of deep rock excavation can lead to the alternation of tension and compression of the structural plane in the rock mass, that is, the phenomenon of ultra-low friction, and then cause the rock burst.In this paper, the characteristics of ultra-low friction effect are studied, the occurrence mechanism of ultra-low friction rockburst is expounded, and the prediction model of discontinuous block rockburst is established. Based on engineering examples, the quantitative prediction of rockburst is carried out.The main work of this paper is as follows: 1. By establishing a one-dimensional discontinuous block model of deep rock mass, the displacement, velocity, acceleration and relative displacement of two adjacent blocks are obtained at any time.On the basis of this model, the alternation law of tension and compression of structural plane in rock mass is explored, the existence of ultra-low friction effect in deep rock mass is revealed, and the influence of this effect on the failure and movement of rock layers is analyzed.The two-dimensional discontinuous block model of deep rock mass is established. The translation equation and rotational equation of each block under instantaneous disturbance force are obtained through the law of interaction between blocks.By means of explicit finite-difference time-domain method, the time-history curves of relative displacement between blocks are obtained, and the phenomenon of ultra-low friction in the surrounding rock of two-dimensional rectangular tunnel is found.The mechanism of ultra-low friction rockburst caused by alternating tension and compression of structural plane in rock mass is put forward.In addition,Based on the two-dimensional discontinuous block model of deep rock mass, the prediction model of rock burst is established to analyze the initiation process of ultra-low friction type rock burst.And the intensity characteristics of rock burst,The corresponding relation is established with the traditional empirical criterion of rock burst intensity classification, which verifies the feasibility of the rock burst model in predicting the rock burst intensity.Through specific examples, the occurrence forms of rockburst caused by geomechanical parameters such as the ratio of major stress in ground stress and the magnitude of principal stress are analyzed.The 2-D rockburst prediction model is applied to the drainage tunnel construction of Jinping II Hydropower Station, and the rock burst prediction analysis is carried out on the section of the cavern under different surrounding rock classes of the project.By comparing with the field measured rock burst data and UDEC simulation results, it is shown that the proposed model is in good agreement with the actual working conditions, thus validating the accuracy of this model in predicting rockburst.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU45

【相似文獻】

相關(guān)期刊論文 前8條

1 宋云;言志信;段建;;摩擦型根-土作用模型[J];巖土力學(xué);2005年S2期

2 熊瑞生，張洪敏;鋼梁拼接的摩擦型高強度螺栓連接的計算[J];信陽師范學(xué)院學(xué)報(自然科學(xué)版);1996年03期

3 言志信;宋云;江平;王后裕;;植物摩擦型根-巖土相互作用的初步研究[J];中國科學(xué):技術(shù)科學(xué);2010年09期

4 楊云;;小議“凱旋一號”樁徑經(jīng)濟性比較[J];大眾科技;2013年09期

5 張云偉,劉躍明,周躍;云南松側(cè)根摩擦型根土粘合鍵的破壞機制及模型[J];山地學(xué)報;2002年05期

6 楊久俊;;摩擦型混凝土純拉伸夾具[J];工程兵工程學(xué)院學(xué)報;1988年04期

7 詹云剛;袁凡凡;欒茂田;;純摩擦型巖土介質(zhì)本構(gòu)積分算法及其在ABAQUS中開發(fā)應(yīng)用[J];巖土力學(xué);2007年12期

8 ;[J];;年期

相關(guān)會議論文 前5條

1 宋麗英;;摩擦型二氧化硅質(zhì)量指標(biāo)[A];中國納米級無機粉體材料發(fā)展·節(jié)能·環(huán)保高峰論壇論文集[C];2007年

2 王常煥;袁國清;;摩擦型鋼承套承載力與抗滑移的試驗研究[A];第14屆全國結(jié)構(gòu)工程學(xué)術(shù)會議論文集（第三冊）[C];2005年

3 胡鵬天;石永久;王元清;;帶施工缺陷摩擦型高強度螺栓承載性能研究[A];鋼結(jié)構(gòu)工程研究（九）——中國鋼結(jié)構(gòu)協(xié)會結(jié)構(gòu)穩(wěn)定與疲勞分會第13屆(ISSF-2012)學(xué)術(shù)交流會暨教學(xué)研討會論文集[C];2012年

4 吳庭偉;;鋼結(jié)構(gòu)高強度螺栓連接形式的合理選用[A];上海市化學(xué)化工學(xué)會2010年度學(xué)術(shù)年會論文集[C];2010年

5 黨志杰;;摩擦型長列高強度螺栓接頭研究[A];中國土木工程學(xué)會橋梁及結(jié)構(gòu)工程學(xué)會第九屆年會論文集[C];1990年

相關(guān)博士學(xué)位論文 前1條

1 張有;摩擦型抗浮地錨的特性研究[D];中國地質(zhì)大學(xué)（北京）;2009年

相關(guān)碩士學(xué)位論文 前2條

1 藍一凡;深埋洞室超低摩擦型巖爆發(fā)生機制與定量預(yù)測[D];重慶大學(xué);2015年

2 孫潔;超聲珩磨摩擦型顫振非線性動力學(xué)模型的建立與分析[D];中北大學(xué);2012年

，

本文編號：1743022