雅康高速公路二郎山隧道地應力特征與圍巖分級研究
發(fā)布時間：2018-12-18 16:34
【摘要】：地應力會對隧道設計與施工造成重大的影響,它受到了區(qū)域內(nèi)地形與地質(zhì)構造等多種因素作用�，F(xiàn)階段,利用鉆孔進行地應力實測是最為有效的地應力場獲取手段。但受到地形、技術及資金的制約,大范圍的地應力鉆孔實測并不現(xiàn)實。因此,可以通過計算機反演計算的方式獲得區(qū)域的地應力。另一方面,相關數(shù)據(jù)表明,目前常用的圍巖分級方法對于復雜地質(zhì)條件下的深埋特長隧道適應性較差,不利于指導隧道施工與支護。因此建立了一種適用于復雜地質(zhì)條件下的圍巖分級判定方法,具有相當?shù)囊饬x。本文以雅康高速公路二郎山隧道為例,取得的研究成果如下:1.分析了二郎山隧道區(qū)域的工程地質(zhì)環(huán)境。二郎山隧道在地理上處于四川盆地與青藏高原交匯的中～高山區(qū),構造上位于我國西部著名的三大構造體系交匯的三岔口一側(cè)。地形雄偉起伏、溝壑叢生,地質(zhì)構造復雜、斷層節(jié)理發(fā)育,巖層出露較為完整。2.根據(jù)CATIA與FLAC3D之間的耦合關系,編寫了CATIA-FLAC3D 口轉(zhuǎn)換程序。以CATIA為建模平臺,建立了二郎山隧道區(qū)域三維地質(zhì)模型,并利用接口程序轉(zhuǎn)換到FLAC3D中進行分析模擬。依據(jù)彈性力學疊加原理,以6種邊界條件來模擬自重應力與構造應力作用,得到計算應力分量,并通過與實測應力分量的回歸分析得出研究區(qū)域的地應力場擬合公式。最終求得,二郎山隧道軸線最大主應力為56.61Mpa,區(qū)域內(nèi)極高、高地應力地區(qū)占到隧道總長的58.47%。3.以反演計算得到的隧道初始地應力為基礎,通過地質(zhì)綜合法與強度應力比法預測隧道軸線圍巖的巖爆與大變形。求得二郎山隧道不發(fā)生巖爆的區(qū)域占隧道總長的79.7%,發(fā)生巖爆的區(qū)域以輕微巖爆為主,局部存在中等及強烈?guī)r爆。不發(fā)生大變形的區(qū)域占到隧道總長的91.4%,發(fā)生大變形區(qū)域僅僅占到8.6%,且多為輕微大變形,少數(shù)局部地區(qū)中等～強烈大變形。4.由于現(xiàn)階段常用BQ法不能較好的滿足復雜地質(zhì)條件下的深埋特長隧道圍巖等級判定,本文在查閱國內(nèi)外多種規(guī)范的基礎上,參考BQ法并結合現(xiàn)場經(jīng)驗建立了二郎山隧道施工階段的BQsg圍巖分級方法,綜合考慮了定性與定量性質(zhì),分層逐步對圍巖分級,并運用于現(xiàn)場實際進行驗證。
[Abstract]:The geostress will have a great influence on the design and construction of the tunnel, and it is affected by many factors, such as the topography and geological structure in the region. At present, it is the most effective method to obtain the in-situ stress field by using borehole to measure the in-situ stress. However, due to the constraints of topography, technology and funds, it is not realistic to measure the borehole stress in a wide range. Therefore, the in-situ stress of the region can be obtained by computer inversion. On the other hand, the relevant data show that the commonly used surrounding rock classification methods are less adaptable to the deep-buried super-long tunnel under complex geological conditions, which is not conducive to guiding the construction and support of the tunnel. Therefore, it is of great significance to establish a classification method of surrounding rock for complex geological conditions. Taking Erlangshan Tunnel of Yakang Expressway as an example, the research results are as follows: 1. The engineering geological environment of Erlangshan Tunnel area is analyzed. The Erlangshan Tunnel is geographically located in the mid-high mountain area where the Sichuan Basin and the Qinghai-Tibet Plateau meet, and structurally on the side of the intersection of the three famous structural systems in the west of China. The topography is majestic and undulating, the gullies are numerous, the geological structure is complex, the fault joints are developed, and the strata are relatively intact. 2. According to the coupling relationship between CATIA and FLAC3D, the CATIA-FLAC3D port conversion program is written. Based on CATIA, a 3D geological model of Erlangshan Tunnel is established, and the interface program is used to analyze and simulate it in FLAC3D. According to the superposition principle of elastic mechanics, six kinds of boundary conditions are used to simulate the action of self-gravity stress and tectonic stress, and the stress component is calculated, and the fitting formula of in-situ stress field is obtained by regression analysis with the measured stress component. Finally, the maximum principal stress of the axis of Erlangshan Tunnel is 56.61Mpa. the area is extremely high, and the area of high ground stress accounts for 58.47% of the total length of the tunnel. Based on the initial geostress obtained from the inversion calculation, the rock burst and large deformation of the surrounding rock around the tunnel axis are predicted by the geological comprehensive method and the intensity stress ratio method. It is found that the area without rockburst in Erlangshan Tunnel accounts for 79.7% of the total length of the tunnel. The area where the rockburst occurs is mainly slight rockburst, and there is moderate and strong rockburst in the local area. The area without large deformation accounts for 91.4% of the total length of tunnel, and the area of large deformation only accounts for 8.6%, and most of them are slight large deformation, and a few local areas are medium to strong large deformation. 4. At present, the BQ method can not meet the criteria of the surrounding rock grade of the deep buried extra-long tunnel under complicated geological conditions, so this paper looks up a variety of codes at home and abroad. Referring to BQ method and combined with site experience, the BQsg surrounding rock classification method in the construction stage of Erlangshan Tunnel is established. The qualitative and quantitative properties are considered synthetically, and the surrounding rock classification is graded step by stratification, which is verified by the field practice.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U452.1
本文編號：2386123
[Abstract]:The geostress will have a great influence on the design and construction of the tunnel, and it is affected by many factors, such as the topography and geological structure in the region. At present, it is the most effective method to obtain the in-situ stress field by using borehole to measure the in-situ stress. However, due to the constraints of topography, technology and funds, it is not realistic to measure the borehole stress in a wide range. Therefore, the in-situ stress of the region can be obtained by computer inversion. On the other hand, the relevant data show that the commonly used surrounding rock classification methods are less adaptable to the deep-buried super-long tunnel under complex geological conditions, which is not conducive to guiding the construction and support of the tunnel. Therefore, it is of great significance to establish a classification method of surrounding rock for complex geological conditions. Taking Erlangshan Tunnel of Yakang Expressway as an example, the research results are as follows: 1. The engineering geological environment of Erlangshan Tunnel area is analyzed. The Erlangshan Tunnel is geographically located in the mid-high mountain area where the Sichuan Basin and the Qinghai-Tibet Plateau meet, and structurally on the side of the intersection of the three famous structural systems in the west of China. The topography is majestic and undulating, the gullies are numerous, the geological structure is complex, the fault joints are developed, and the strata are relatively intact. 2. According to the coupling relationship between CATIA and FLAC3D, the CATIA-FLAC3D port conversion program is written. Based on CATIA, a 3D geological model of Erlangshan Tunnel is established, and the interface program is used to analyze and simulate it in FLAC3D. According to the superposition principle of elastic mechanics, six kinds of boundary conditions are used to simulate the action of self-gravity stress and tectonic stress, and the stress component is calculated, and the fitting formula of in-situ stress field is obtained by regression analysis with the measured stress component. Finally, the maximum principal stress of the axis of Erlangshan Tunnel is 56.61Mpa. the area is extremely high, and the area of high ground stress accounts for 58.47% of the total length of the tunnel. Based on the initial geostress obtained from the inversion calculation, the rock burst and large deformation of the surrounding rock around the tunnel axis are predicted by the geological comprehensive method and the intensity stress ratio method. It is found that the area without rockburst in Erlangshan Tunnel accounts for 79.7% of the total length of the tunnel. The area where the rockburst occurs is mainly slight rockburst, and there is moderate and strong rockburst in the local area. The area without large deformation accounts for 91.4% of the total length of tunnel, and the area of large deformation only accounts for 8.6%, and most of them are slight large deformation, and a few local areas are medium to strong large deformation. 4. At present, the BQ method can not meet the criteria of the surrounding rock grade of the deep buried extra-long tunnel under complicated geological conditions, so this paper looks up a variety of codes at home and abroad. Referring to BQ method and combined with site experience, the BQsg surrounding rock classification method in the construction stage of Erlangshan Tunnel is established. The qualitative and quantitative properties are considered synthetically, and the surrounding rock classification is graded step by stratification, which is verified by the field practice.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U452.1
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