本文關鍵詞：錦屏二級深埋隧道大理巖段突水破壞機理研究　出處：《成都理工大學》2014年碩士論文　論文類型：學位論文

  更多相關文章： 深埋隧道 突水破壞機理 高壓試驗 力學分析模型 數(shù)值模擬

【摘要】：錦屏二級深埋隧道位于四川省涼山彝族自治州木里、鹽源、冕寧三縣交界處的雅礱江錦屏大河灣處，其深埋引水隧道平均長度16.67km，橫穿錦屏山河間地帶，具有“埋深大、洞線長、洞徑大”的特點。工程區(qū)域內可溶巖分布廣，巖溶發(fā)育，巖溶儲水豐富，導致工程開挖后誘發(fā)產生大量突水災害，對人員和財產安全造成巨大威脅。 本文通過對錦屏二級深埋隧道工程地質條件、水文地質條件及深埋隧道突水災害特征進行分析，建立了錦屏二級深埋隧道大理巖突水破壞機制概念模型。根據(jù)概念模型理論，利用成都理工大學自行研制的大型巖石高壓滲透試驗儀進行了一系列的巖石高壓破壞及高壓滲透試驗，并通過理論推導得到大理巖突水破壞的力學分析模型。最后結合力學分析模型和數(shù)值模擬深入研究了錦屏二級深埋隧道突水破壞機理。 論文主要研究成果如下： 1.錦屏二級深埋隧道突水破壞受多種因素影響。其中，隧道開挖人工擾動是主要誘因，高地應力高水壓條件是突水破壞發(fā)生的必要條件，巖石的自身滲透特性改變是突水破壞發(fā)生的內因。通過對巖石突水破壞概念模型的分析得出，，高地應力、高水壓力和大理巖滲透特性是研究區(qū)內突水破壞的三個主要影響因素。 2.試驗結果表明：圍巖壓力越高，滲透壓越高，巖石越容易發(fā)生突水破壞。滲透壓升高不僅會提升裂隙、孔隙內水壓力，還會降低巖石的峰值強度，促進巖體破壞。高壓水在巖石變形破壞的不同階段具有不同的作用，在巖石進入裂紋穩(wěn)定擴展后，高壓水對巖石有一定的保護作用，引導巖石通過形變抵抗巖石應力增加，但僅能延長巖石破壞的時間，對提高巖石的峰值強度影響不大。且隨著水壓值升高巖石的破壞模式逐漸由剪切破壞為主導轉化為由壓致拉裂破壞為主導。當巖石內部裂隙擴展貫通后，高壓水加速巖石破壞，降低巖石的殘余強度值。這在一定程度上解釋了巖體突水破壞的滯后性和突發(fā)性。 3.通過建立大理巖突水破壞單元體新生裂隙力學分析模型，結合巖樣單元體在試驗中中的受力條件，并將高壓水引入受力分析。通過三種不同的巖石裂紋擴展準則判定，證明裂隙內部有高壓水填充時，裂隙的應力狀態(tài)更加穩(wěn)定。 4.使用有限元模擬方法對錦屏二級深埋隧道工程區(qū)內的地應力條件及開挖過程中隧道應力演化過程進行分析得到：隧道范圍內白山組區(qū)域的應力條件高于巖塘組和雜谷腦組，初始狀態(tài)下白山組最大第一、第三主應力分別為65MPa和13MPa；開挖過程中除T3區(qū)域的第一主應力值明顯下降外，其余區(qū)域應力隨開挖深度增大而升高。 5.結合試驗、力學分析模型及數(shù)值模擬三方面的研究，大理巖突水破壞機理可以概括為：隧道開挖后，大理巖在高地應力高水壓條件下發(fā)生應力場、滲流場重分布，圍巖應力集中加劇，滲流通道內水壓力升高。隨著壓力值的升高，巖體進入塑性變形階段，由于高壓水的作用，巖體產生大量微裂隙抵抗形變，延長巖體破壞的時間，同時巖體結構趨于碎裂化。最終巖體完全破壞，破碎的巖體隨高壓水一同沖出形成突水。
[Abstract]:Jinping two deep buried tunnel in Sichuan Yi Autonomous Prefecture in Liangshan province Muli, Yanyuan, Jinping Yalong River Bay at the junction of three Mianning County Office, the deep buried tunnel of average length of 16.67km, across the Jinping land area, with the depth, hole length, hole diameter characteristics ". Within the project area can be karst distributes widely, karst, karst water rich, leading to the project after the excavation induced large inrush of water disasters, poses a great threat to the safety of persons and property.
This article through to the Jinping two level deep engineering geological conditions of tunnel, hydro geological conditions and the characteristics of deep buried tunnel water bursting disaster analysis, the establishment of the Jinping two level deep tunnel water inrush marble failure mechanism conceptual model. According to the conceptual model theory, from the large rock high pressure permeability test instrument for the development of rock damage and high pressure a series of high pressure permeability test using the Chengdu University of Technology, and damage mechanics analysis model of marble water inrush through theoretical derivation. Finally combining with mechanical model and numerical simulation research of Jinping two deep buried tunnel water bursting failure mechanism.
The main research results of this paper are as follows:
1. Jinping two deep tunnel water inrush damage is affected by many factors. Among them, the artificial disturbance is the main cause of tunnel excavation, high stress and high water pressure condition is a necessary condition for the occurrence of water inrush damage, rock permeability change is its water bursting failure. Through the analysis of internal damage model of rock water inrush concept that high stress, high water pressure and seepage characteristics of marble are three main influential factors in the research area of water inrush from destruction.
2. test results show that the surrounding rock pressure is high, the osmotic pressure is higher, the more prone to sudden water rock damage. The increase of osmotic pressure will not only enhance the fracture pore water pressure, but also reduce the peak strength of rock, promote the rock failure. High pressure water has different roles in different stages of rock deformation and failure in rock entry stable crack growth, high pressure water has a protective effect on the rock rock rock deformation resistance by lead stress increases, but can only prolong the time of rock failure, did not improve the peak strength of rock. And with the influence of hydraulic pressure increased gradually from the failure mode of rock shear failure leading into compressioncracking damage as the leading rock. When the crack propagation through high pressure water, accelerate the failure of rock, reduce the residual strength of rock. This explains the lag of the damage of the rock water inrush in a certain extent And sudden.
3. an analysis model failure unit new fractures mechanics marble water inrush, combined with the sample unit in the test of the stress condition, and the force analysis of the introduction of high pressure water. By three different criteria of rock crack propagation, crack proof internal high pressure water filling, the fracture stress state is more stable.
4. using the finite element simulation method of Jinping two deep buried tunnel engineering stress conditions in the region and in the process of tunnel excavation stress evolution analysis: the tunnel within the scope of the Baishan regional stress conditions is higher than that of rock Tang Group and Zagunao group, the initial state of Baishan group the first third principal stress respectively 65MPa and 13MPa; in the process of excavation in the first principal stress T3 region decreased significantly, the regional stress increases with the increase of excavation depth.
5. according to the test, the mechanical analysis of three aspects of the model and numerical simulation, the failure mechanism of water inrush of marble can be summarized as follows: after the tunnel excavation, rock stress under high water pressure stress field in the Highlands, the seepage field distribution, stress concentration increased, the seepage channel water pressure increases. With the increase of pressure value rock, entered the stage of plastic deformation, due to the action of the high-pressure water, resulting in a large number of micro cracks of rock mass deformation resistance, prolong the time of rock damage, and rock fragmentation. Rock mass structure tends to be completely destroyed, broken rock with high pressure water together out of the water inrush.

【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U457.2

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