橋隧相連落石防護(hù)新型結(jié)構(gòu)設(shè)計(jì)技術(shù)研究
發(fā)布時間：2018-08-07 15:53
【摘要】：近年,我國鐵路建設(shè)快速發(fā)展,新建線路不斷向地質(zhì)復(fù)雜困難的山區(qū)延伸。高標(biāo)準(zhǔn)的山區(qū)鐵路經(jīng)常采用橋隧相接的形式通過大高差地貌單元,橋隧相連洞口上方落石給鐵路運(yùn)營安全帶來很大安全風(fēng)險。目前,對于橋隧相接落石防護(hù)結(jié)構(gòu)的動力響應(yīng)研究還不多,相應(yīng)的工程設(shè)計(jì)還缺少基礎(chǔ)性技術(shù)支撐。因此,研究隧道洞口橋隧相連落石防護(hù)復(fù)合結(jié)構(gòu)的合理結(jié)構(gòu)形式、以及主要外部動力作用下的結(jié)構(gòu)動力響應(yīng)具有重要的理論和實(shí)際意義。本研究首先對國內(nèi)外隧道洞口落石災(zāi)害、防護(hù)措施、防護(hù)結(jié)構(gòu)與橋梁的連接方式進(jìn)行案例調(diào)查,明確落石沖擊作用的主要影響因素,對落石防護(hù)結(jié)構(gòu)的形式進(jìn)行探討,提出翼緣板縱梁式矩形框架型和拱墻型棚洞作為橋隧相接落石防護(hù)復(fù)合結(jié)構(gòu)的兩種基本結(jié)構(gòu)形式進(jìn)行研究;然后以張懷客專鄧家坡隧道進(jìn)口橋隧相連為研究對象,通過理論分析確定落石沖擊荷載的最不利工況,采用三維動力有限元數(shù)值模擬的技術(shù)手段,研究不同能級的落石沖擊荷載作用下落石防護(hù)復(fù)合結(jié)構(gòu)的動力響應(yīng),針對各種落石能級驗(yàn)算橋梁翼緣板承載力,并提出相應(yīng)的工程對策;最后分別對地震和側(cè)向風(fēng)荷載作用下橋隧相接落石防護(hù)復(fù)合結(jié)構(gòu)的動力響應(yīng)進(jìn)行初步分析計(jì)算,探討地震和側(cè)向風(fēng)荷載的影響。主要研究成果如下:(1)通過文獻(xiàn)調(diào)查,分析了橋隧相接落石防護(hù)的主要工程對策,明確了落石防護(hù)能量的設(shè)計(jì)等級,提出了兩種落石防護(hù)復(fù)合結(jié)構(gòu)的結(jié)構(gòu)形式(翼緣板縱梁式矩形框架型和拱墻型棚洞)。(2)利用三維動力有限元技術(shù),對兩種防護(hù)復(fù)合結(jié)構(gòu)進(jìn)行了落石沖擊數(shù)值模擬。分析了不同緩沖層在減少落石沖擊力和增加沖擊距離方面的作用,明確了落石沖擊位置對棚洞結(jié)構(gòu)受力的影響,討論了落石沖擊對棚洞作用的最不利工況,得到了各種能級作用下棚洞的落石沖擊力系數(shù)。(3)根據(jù)落石沖擊數(shù)值模擬的結(jié)果,明確了落石沖擊通過棚洞縱梁對橋梁翼緣板產(chǎn)生附加沖擊荷載,得到了棚洞立柱附加軸力沖擊系數(shù),提出了翼緣板加固方案并驗(yàn)算了安全性。(4)利用三維動力有限元技術(shù),分別對側(cè)向風(fēng)荷載和地震作用進(jìn)行了初步分析計(jì)算。明確了側(cè)向十級風(fēng)荷載對棚洞復(fù)合結(jié)構(gòu)以及橋梁的作用比較小。地震作用下棚洞復(fù)合結(jié)構(gòu)對橋墩的斷面力影響較大,需要進(jìn)一步研究。
[Abstract]:In recent years, with the rapid development of railway construction in China, the newly-built railway lines continue to extend to mountainous areas with complicated geological conditions. The high standard mountain railway often uses the bridge and tunnel connection form through the big height difference geomorphology unit, the bridge and tunnel connects the tunnel mouth to fall the stone to bring the very big safety risk to the railway operation safety. At present, there is not much research on the dynamic response of the bridge and tunnel rock fall protection structure, and the corresponding engineering design is still lack of basic technical support. Therefore, it is of great theoretical and practical significance to study the reasonable structure form of the composite structure with rock fall protection at the tunnel entrance, and the dynamic response of the structure under the main external dynamic action. In this study, first of all, a case investigation was carried out on the rock fall disaster at the tunnel entrance, the protective measures, the connection between the protection structure and the bridge, and the main influencing factors of the rock fall impact were identified, and the form of the stone fall protection structure was discussed. The flange plate longitudinal beam type rectangular frame type and arch wall type shed tunnel are proposed as the two basic structure forms of the composite structure of stone fall protection, and then the entrance bridge and tunnel of Dengjiapo Tunnel of Zhanghuai Special College is taken as the research object. Through theoretical analysis, the most unfavorable condition of falling stone impact load is determined. The dynamic response of falling stone protection composite structure with different energy levels under falling stone impact load is studied by means of 3D dynamic finite element numerical simulation. The bearing capacity of flange plate of bridge is checked according to various falling rock levels and corresponding engineering countermeasures are put forward. Finally, the dynamic response of the composite structure of bridge and tunnel falling stone under earthquake and lateral wind load is analyzed and calculated. The influence of earthquake and lateral wind load is discussed. The main research results are as follows: (1) through the literature investigation, the paper analyzes the main engineering countermeasures of the bridge and tunnel rock fall protection, and clarifies the design grade of the falling stone protection energy. In this paper, two kinds of composite structures (flange plate longitudinal beam rectangular frame type and arch wall shed tunnel). (2) are proposed to simulate the falling stone impact of the two composite structures by using three-dimensional dynamic finite element technique. The effects of different buffer layers on reducing the impact force and increasing the impact distance are analyzed. The influence of the impact position on the stress of the shed tunnel structure is clarified, and the most unfavorable working condition of the stone falling impact on the shed tunnel is discussed. The rock drop impact force coefficients of the shed tunnel under various energy levels are obtained. (3) according to the numerical simulation results of the falling stone impact, the additional impact load on the flange plate of the bridge caused by the falling stone impact through the longitudinal beam of the shed tunnel is determined. The impact coefficient of additional axial force is obtained, and the strengthening scheme of flange plate is put forward and the safety is checked. (4) the lateral wind load and seismic action are preliminarily analyzed and calculated by using three-dimensional dynamic finite element method. It is clear that the lateral ten-step wind load has little effect on the composite structure and bridge. The composite structure of shed-hole has a great influence on the cross-section force of bridge pier under earthquake, which needs further study.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U443.8;U453.8
本文編號：2170536
[Abstract]:In recent years, with the rapid development of railway construction in China, the newly-built railway lines continue to extend to mountainous areas with complicated geological conditions. The high standard mountain railway often uses the bridge and tunnel connection form through the big height difference geomorphology unit, the bridge and tunnel connects the tunnel mouth to fall the stone to bring the very big safety risk to the railway operation safety. At present, there is not much research on the dynamic response of the bridge and tunnel rock fall protection structure, and the corresponding engineering design is still lack of basic technical support. Therefore, it is of great theoretical and practical significance to study the reasonable structure form of the composite structure with rock fall protection at the tunnel entrance, and the dynamic response of the structure under the main external dynamic action. In this study, first of all, a case investigation was carried out on the rock fall disaster at the tunnel entrance, the protective measures, the connection between the protection structure and the bridge, and the main influencing factors of the rock fall impact were identified, and the form of the stone fall protection structure was discussed. The flange plate longitudinal beam type rectangular frame type and arch wall type shed tunnel are proposed as the two basic structure forms of the composite structure of stone fall protection, and then the entrance bridge and tunnel of Dengjiapo Tunnel of Zhanghuai Special College is taken as the research object. Through theoretical analysis, the most unfavorable condition of falling stone impact load is determined. The dynamic response of falling stone protection composite structure with different energy levels under falling stone impact load is studied by means of 3D dynamic finite element numerical simulation. The bearing capacity of flange plate of bridge is checked according to various falling rock levels and corresponding engineering countermeasures are put forward. Finally, the dynamic response of the composite structure of bridge and tunnel falling stone under earthquake and lateral wind load is analyzed and calculated. The influence of earthquake and lateral wind load is discussed. The main research results are as follows: (1) through the literature investigation, the paper analyzes the main engineering countermeasures of the bridge and tunnel rock fall protection, and clarifies the design grade of the falling stone protection energy. In this paper, two kinds of composite structures (flange plate longitudinal beam rectangular frame type and arch wall shed tunnel). (2) are proposed to simulate the falling stone impact of the two composite structures by using three-dimensional dynamic finite element technique. The effects of different buffer layers on reducing the impact force and increasing the impact distance are analyzed. The influence of the impact position on the stress of the shed tunnel structure is clarified, and the most unfavorable working condition of the stone falling impact on the shed tunnel is discussed. The rock drop impact force coefficients of the shed tunnel under various energy levels are obtained. (3) according to the numerical simulation results of the falling stone impact, the additional impact load on the flange plate of the bridge caused by the falling stone impact through the longitudinal beam of the shed tunnel is determined. The impact coefficient of additional axial force is obtained, and the strengthening scheme of flange plate is put forward and the safety is checked. (4) the lateral wind load and seismic action are preliminarily analyzed and calculated by using three-dimensional dynamic finite element method. It is clear that the lateral ten-step wind load has little effect on the composite structure and bridge. The composite structure of shed-hole has a great influence on the cross-section force of bridge pier under earthquake, which needs further study.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U443.8;U453.8
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