軟弱圍巖隧道管棚支護及其體系下鎖腳錨桿數(shù)值模擬研究
發(fā)布時間：2018-08-01 12:36
【摘要】：進入21世紀(jì)后,國家大力發(fā)展交通事業(yè),公路、鐵路以及地鐵隧道建設(shè)得以蓬勃發(fā)展,我國又是一個多山的國家,隧道因其技術(shù)特點在交通中的重要性也日益突出。而很多隧道都處于不良地層段,如富水地層、軟弱圍巖、巖溶、斷層破碎帶等,為防止隧道開挖后圍巖發(fā)生過大變形而造成工程事故,就必須在開挖前對圍巖采取預(yù)加固措施,管棚支護因其良好的支護性能逐漸成為穿越不良地段的重要施工技術(shù)。但是管棚支護的設(shè)計、施工多是借鑒于類似工程,而這已不能很好的適應(yīng)當(dāng)前工程發(fā)展的需要,因此在隧道開挖過程中,管棚支護參數(shù)進行定量分析的研究就十分必要。論文介紹了隧道超前支護的施工方法和特點,并重點介紹了管棚支護在施工和支護機理的國內(nèi)外研究現(xiàn)狀,同時介紹了利用ABAQUS建立數(shù)值計算模型的步驟。通過選取深圳大望山地質(zhì)參數(shù),采用Mohr-Coulomb強度屈服準(zhǔn)則,借助ABAQUS有限元軟件建立數(shù)值模型,對比分析二維模型下設(shè)置管棚和未設(shè)置管棚、鎖腳錨桿不同角度、長度、排數(shù)、位置以及不同圍巖性質(zhì)下隧道位移,得到設(shè)置管棚能有效約束隧道的變形,同時鎖腳錨桿長度和角度只有在一定的范圍內(nèi)對隧道變形的抑制作用才明顯,打設(shè)排數(shù)和位置則與相應(yīng)部位的變形收斂有關(guān),圍巖性質(zhì)的變化對隧道變形的影響最為顯著。對比分析三維模型下管棚參數(shù)、注漿半徑、開挖方式、開挖半徑以及不同圍巖性質(zhì)情況隧道開挖下隧道變形和鋼管應(yīng)力。得到以下結(jié)論:管徑和管間距的變化對隧道變形影響不大,但對鋼管應(yīng)力影響有著顯著區(qū)別;不同注漿半徑對隧道變形和鋼管應(yīng)力影響較大,注漿半徑越大,圍巖塑性區(qū)應(yīng)變越小,隧道變形和鋼管應(yīng)力越小,預(yù)加固區(qū)能夠更好的發(fā)揮其承載性能;雙側(cè)壁導(dǎo)坑法開挖較CRD法開挖位移影響范圍和塑性區(qū)應(yīng)變更小,圍巖所處拉應(yīng)力區(qū)范圍也越小,隧道變形和鋼管應(yīng)力更小;開挖進尺對于隧道變形有著明顯的影響,隨著開挖進尺的增大,圍巖位移影響范圍和塑性區(qū)應(yīng)變值也逐漸增大;不同圍巖性質(zhì)下隧道開挖圍巖變形和應(yīng)力都有著明顯變化。因此,在軟弱圍巖隧道施工時,應(yīng)根據(jù)不同的地質(zhì)情況,選取合理的管棚支護結(jié)構(gòu)參數(shù),并選取合理的開挖方式,控制開挖進尺,保證隧道的順利施工。
[Abstract]:After entering the 21st century, the country has vigorously developed transportation, highway, railway and subway tunnel construction. China is also a mountainous country, and the tunnel is becoming more and more important in traffic because of its technical characteristics. Many tunnels are in bad strata, such as water-rich stratum, weak surrounding rock, karst, fault broken zone and so on. In order to prevent engineering accidents caused by excessive deformation of surrounding rock after tunnel excavation, pre-reinforcement measures must be taken to surrounding rock before excavation. Pipe-shed support has gradually become an important construction technology through bad areas because of its good supporting performance. However, the design and construction of pipe-shed support are mostly used for reference to similar projects, which can not meet the needs of current engineering development, so it is very necessary to study the quantitative analysis of the parameters of pipe-shed support in the process of tunnel excavation. This paper introduces the construction method and characteristics of tunnel advance support, and emphatically introduces the research status of pipe shed support in construction and supporting mechanism at home and abroad. At the same time, it introduces the steps of establishing numerical calculation model by using ABAQUS. By selecting the geological parameters of Dawangshan, Shenzhen, adopting Mohr-Coulomb strength yield criterion and using ABAQUS finite element software to establish a numerical model, this paper compares and analyzes the different angles, length and number of anchors with and without the pipe shed in the two dimensional model. When the tunnel displacement is different from the position of the surrounding rock, it is concluded that the tunnel deformation can be restrained effectively by setting the pipe shed, and at the same time, the length and angle of the locking anchor rod can only restrain the tunnel deformation obviously in a certain range. The number and position of arrangement are related to the convergence of deformation, and the change of surrounding rock property has the most significant influence on tunnel deformation. The parameters of pipe shed, grouting radius, excavation method, excavation radius and tunnel deformation and steel pipe stress under different surrounding rock properties are compared and analyzed in three dimensional model. The following conclusions are obtained: the variation of pipe diameter and spacing has little effect on tunnel deformation, but has significant difference on the stress of steel pipe, and different grouting radius has greater influence on tunnel deformation and steel pipe stress, and the larger the grouting radius is, The smaller the strain in the plastic zone of surrounding rock, the smaller the strain of tunnel and steel tube, the better the bearing capacity of pre-strengthened zone can be. The smaller the range of tensile stress zone of surrounding rock is, the smaller the stress of tunnel and steel tube is, and the influence of excavation advance on tunnel deformation is obvious, and with the increase of excavation ruler, the influence range of surrounding rock displacement and strain value of plastic zone also increase gradually. The deformation and stress of surrounding rock in tunnel excavation have obvious changes under different surrounding rock properties. Therefore, in the construction of soft surrounding rock tunnel, reasonable parameters of pipe-shed support structure should be selected according to different geological conditions, and reasonable excavation mode should be selected to control the excavation advance to ensure the smooth construction of the tunnel.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U455.7
本文編號：2157603
[Abstract]:After entering the 21st century, the country has vigorously developed transportation, highway, railway and subway tunnel construction. China is also a mountainous country, and the tunnel is becoming more and more important in traffic because of its technical characteristics. Many tunnels are in bad strata, such as water-rich stratum, weak surrounding rock, karst, fault broken zone and so on. In order to prevent engineering accidents caused by excessive deformation of surrounding rock after tunnel excavation, pre-reinforcement measures must be taken to surrounding rock before excavation. Pipe-shed support has gradually become an important construction technology through bad areas because of its good supporting performance. However, the design and construction of pipe-shed support are mostly used for reference to similar projects, which can not meet the needs of current engineering development, so it is very necessary to study the quantitative analysis of the parameters of pipe-shed support in the process of tunnel excavation. This paper introduces the construction method and characteristics of tunnel advance support, and emphatically introduces the research status of pipe shed support in construction and supporting mechanism at home and abroad. At the same time, it introduces the steps of establishing numerical calculation model by using ABAQUS. By selecting the geological parameters of Dawangshan, Shenzhen, adopting Mohr-Coulomb strength yield criterion and using ABAQUS finite element software to establish a numerical model, this paper compares and analyzes the different angles, length and number of anchors with and without the pipe shed in the two dimensional model. When the tunnel displacement is different from the position of the surrounding rock, it is concluded that the tunnel deformation can be restrained effectively by setting the pipe shed, and at the same time, the length and angle of the locking anchor rod can only restrain the tunnel deformation obviously in a certain range. The number and position of arrangement are related to the convergence of deformation, and the change of surrounding rock property has the most significant influence on tunnel deformation. The parameters of pipe shed, grouting radius, excavation method, excavation radius and tunnel deformation and steel pipe stress under different surrounding rock properties are compared and analyzed in three dimensional model. The following conclusions are obtained: the variation of pipe diameter and spacing has little effect on tunnel deformation, but has significant difference on the stress of steel pipe, and different grouting radius has greater influence on tunnel deformation and steel pipe stress, and the larger the grouting radius is, The smaller the strain in the plastic zone of surrounding rock, the smaller the strain of tunnel and steel tube, the better the bearing capacity of pre-strengthened zone can be. The smaller the range of tensile stress zone of surrounding rock is, the smaller the stress of tunnel and steel tube is, and the influence of excavation advance on tunnel deformation is obvious, and with the increase of excavation ruler, the influence range of surrounding rock displacement and strain value of plastic zone also increase gradually. The deformation and stress of surrounding rock in tunnel excavation have obvious changes under different surrounding rock properties. Therefore, in the construction of soft surrounding rock tunnel, reasonable parameters of pipe-shed support structure should be selected according to different geological conditions, and reasonable excavation mode should be selected to control the excavation advance to ensure the smooth construction of the tunnel.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U455.7
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