本文選題：隧道式錨碇　切入點(diǎn)：交通荷載　出處：《西南交通大學(xué)》2017年碩士論文

【摘要】：懸索橋隧道式錨碇是一種能充分利用橋位岸坡工程地質(zhì)條件、工程量相對(duì)較小、性價(jià)比較高、對(duì)周邊環(huán)境擾動(dòng)較小的錨碇式結(jié)構(gòu),廣泛應(yīng)用于山區(qū)高速公路大跨度橋梁工程中。本文依托四川雅安至康定高速公路瀘定大渡河橋隧道式錨碇工程,在靜力分析的基礎(chǔ)上,著重討論在交通荷載作用下隧道式錨碇承載特性與錨碇邊坡穩(wěn)定性。主要研究結(jié)果如下:采用彈性理論和極限平衡分析方法,推導(dǎo)出隧道式錨碇承載力近似理論計(jì)算公式。揭示了靜力條件(1、3.5、7、10.5倍設(shè)計(jì)纜力)、動(dòng)力條件(滿載、超載、超速)下隧道式錨碇的承載特性及響應(yīng)規(guī)律。得出在10.5倍設(shè)計(jì)纜力作用下,錨碇圍巖局部發(fā)生破壞,錨碇摩阻應(yīng)力將重分布,并給出應(yīng)力重分布曲線�；诶碚摲治龇椒ǖ玫�,在1倍纜力作用下,錨碇重力對(duì)錨碇的側(cè)摩阻力影響顯著,側(cè)摩阻力分布模式與3.5倍、7倍、10.5倍纜力作用下的結(jié)果差異明顯。在錨碇的不同受力狀態(tài)下,對(duì)比分析了理論計(jì)算與數(shù)值模擬結(jié)果,二者誤差大小為 10%～30%。采用FLAC3D數(shù)值模擬與理論分析方法計(jì)算了交通荷載下隧道式錨碇動(dòng)力響應(yīng)特征,得到車輛運(yùn)行速度是錨碇承載性波動(dòng)周期的主要因素,而超載與滿載是影響錨碇的受力大小的主要因素,但并不是響應(yīng)周期的主要影響因素。采用FLAC3D模擬分析了隧道式錨碇邊坡在自然狀態(tài)、設(shè)計(jì)纜力、纜索超張拉、交通荷載滿載、超載、低速、常速、高速、超速等工況下的穩(wěn)定性及錨碇承載特性。隧道式錨碇邊坡在自然狀態(tài)、隧道開(kāi)挖工況下存在淺表層潛在失穩(wěn)模式,相應(yīng)穩(wěn)定系數(shù)為1.52,但在其他工況下,因?qū)吰聹\表層的潛在滑動(dòng)面進(jìn)行支護(hù)處理,穩(wěn)定性提高,相應(yīng)穩(wěn)定系數(shù)約為1.64。在超速(150km/h)和10倍超載的情況下,交通荷載對(duì)邊坡穩(wěn)定性幾乎沒(méi)有影響,但對(duì)錨碇受力則產(chǎn)生顯著影響,其作用相當(dāng)于88.9%的1倍設(shè)計(jì)纜力作用。本研究得到的在靜力與交通荷載作用下隧道式錨碇及其邊坡力學(xué)響應(yīng)的相關(guān)結(jié)果,可以為懸索橋隧道式錨碇及其邊坡的工程設(shè)計(jì)提供理論指導(dǎo)和參考。
[Abstract]:The suspension bridge tunnel Anchorage is a kind of Anchorage structure which can make full use of the engineering geological conditions of the bank slope of the bridge position, with relatively small amount of work, high ratio of performance to price and less disturbance to the surrounding environment. This paper relies on the tunnel Anchorage project of Luding Dadu River Bridge of Ya'an to Kangding Expressway in Sichuan Province, on the basis of static analysis, The load-bearing characteristics of tunnel Anchorage and the stability of Anchorage slope under traffic load are discussed emphatically. The main results are as follows: elastic theory and limit equilibrium analysis method are used. An approximate theoretical formula for calculating the bearing capacity of tunnel Anchorage is derived. Under the action of 10.5 times of designed cable force, the local failure of surrounding rock of the Anchorage will occur, and the stress distribution curve of the Anchorage will be redistributed, and the stress redistribution curve will be given based on the theoretical analysis method. Under the action of one-fold cable force, the influence of Anchorage gravity on the lateral friction resistance of the Anchorage is significant, and the distribution pattern of lateral frictional resistance is obviously different from that of 3.5 times and 7 times to 10.5 times cable force. The results of theoretical calculation and numerical simulation are compared and analyzed. The error between them is 100.The dynamic response characteristics of tunnel Anchorage under traffic load are calculated by FLAC3D numerical simulation and theoretical analysis method. The results show that the vehicle speed is the main factor of the load bearing fluctuation period of the Anchorage, and the overload and the full load are the main factors that affect the force size of the Anchorage. But it is not the main factor of the response period. The natural state of tunnel Anchorage slope, the design cable force, cable overtension, traffic load, overload, low speed, constant speed and high speed are simulated by FLAC3D. The stability of tunnel Anchorage slope in natural state and the potential instability mode of shallow surface in tunnel excavation condition, the corresponding stability coefficient is 1.52, but under other working conditions, the stability of tunnel Anchorage slope under the same condition is 1.52. The stability of the potential sliding surface of the shallow surface of the slope is improved, and the corresponding stability coefficient is about 1.64.The traffic load has little effect on the slope stability under the condition of 150 km / h overspeed and 10 times overload. However, it has a significant effect on the anchorage force, which is equivalent to 88.9% of the designed cable force. The results obtained in this study are related to the mechanical response of the tunnel Anchorage and its slope under the static and traffic loads. It can provide theoretical guidance and reference for the engineering design of suspension bridge tunnel Anchorage and its slope.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U448.25

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