【摘要】：近年來(lái),橋梁的不斷建造和持續(xù)發(fā)展在我國(guó)的交通事業(yè)中占據(jù)著主導(dǎo)地位,隨著橋梁施工技術(shù)和設(shè)計(jì)技術(shù)的不斷進(jìn)步,懸索橋便在縱多大跨徑橋型當(dāng)中應(yīng)運(yùn)而生,解決了人們跨越峽谷、河道、大江、海域等技術(shù)上的難題。作為懸索橋一個(gè)重要的承載構(gòu)件,錨碇在整個(gè)懸索橋的設(shè)計(jì)和施工中是一個(gè)很重要的環(huán)節(jié)。在眾多的橋梁隧道式錨碇工程計(jì)算研究中,車輛與結(jié)構(gòu)動(dòng)力的作用是一個(gè)相對(duì)復(fù)雜的難題。當(dāng)列車通過(guò)橋梁時(shí),橋梁結(jié)構(gòu)除了要承受靜荷載作用外,還要承受包括移動(dòng)荷載對(duì)橋梁的慣性力等動(dòng)力荷載的作用。對(duì)于車行荷載對(duì)懸索橋隧道錨設(shè)計(jì)的研究,目前大多數(shù)只是在車行荷載方面做出相應(yīng)研究以及在隧道式錨定設(shè)計(jì)與施工方面進(jìn)行研究。而同時(shí)“將車行荷載”和“隧道錨穩(wěn)定性的分析”結(jié)合起來(lái)的研究相對(duì)較少。懸索橋在最不利車行荷載作用下隧道式錨碇穩(wěn)定性問(wèn)題是本課題的關(guān)鍵。本文介紹了懸索橋隧道錨的結(jié)構(gòu),作用機(jī)理以及穩(wěn)定性的相關(guān)理論,利用擬靜力法在車行荷載作用下的理論研究分析懸索橋在最不利車行荷載作用下索纜處傳遞到隧道式錨碇的受力。以貴州壩陵河懸索橋?yàn)楣こ虒?shí)例,建立懸索橋三維模型并施加最不利車行荷載,最終得到橋梁在最不利車行荷載作用下主纜所受的最大的拉力。同時(shí)建立巖體的三維模型,并將懸索橋在最不利車行荷載作用下受到的的最大主纜拉力,以及3到5倍的最大纜力,施加在懸索橋錨碇區(qū)錨塞體上。對(duì)錨碇區(qū)巖體的開(kāi)挖和回填進(jìn)行相應(yīng)的穩(wěn)定性分析最終得出如下結(jié)論:○1從巖體開(kāi)挖后的位移和應(yīng)力來(lái)看,位移和應(yīng)力較小,開(kāi)挖后錨洞四周巖土均有向內(nèi)傾斜的趨勢(shì),為保證下一個(gè)階段的正常施工,應(yīng)予加固處理�！�2在3到5倍索纜拉力作用下,位移較小,隧道錨體及巖體的位移和應(yīng)力較小,整體處于安全狀態(tài),不影響橋梁的正常工作。○3繼續(xù)施加大纜力,當(dāng)施加7倍纜力時(shí),在開(kāi)挖巖體的四周及錨碇區(qū)與圍巖的交界面處出現(xiàn)了塑性區(qū),并隨著纜力的增加塑性區(qū)逐漸向巖體四周擴(kuò)展。本文對(duì)壩陵河懸索橋隧道錨固系統(tǒng)以及圍巖進(jìn)行了安全評(píng)估,為設(shè)計(jì)與施工提供重要的依據(jù)。
[Abstract]:In recent years, the continuous construction and sustainable development of bridges play a leading role in China's transportation industry. With the continuous progress of bridge construction technology and design technology, suspension bridges emerge as the times require in the longitudinal multi-span bridge. Solve people across canyons, rivers, sea areas and other technical problems. As an important bearing member of suspension bridge, Anchorage is an important link in the design and construction of suspension bridge. The role of vehicle and structure is a relatively complicated problem in the calculation of bridge tunnel Anchorage engineering. When the train passes through the bridge, the bridge structure must bear not only the static load, but also the dynamic load, including the inertia force of the moving load on the bridge. At present, most of the researches on the design of tunnel anchors for suspension bridges are only related to the vehicle load and the design and construction of tunnel anchoring. At the same time, the combination of vehicle load and analysis of tunnel anchor stability is relatively rare. The stability of the tunnel Anchorage of suspension bridge under the most unfavorable vehicle load is the key of this paper. In this paper, the structure, action mechanism and stability theory of suspension bridge tunnel anchor are introduced. The theory of quasi-static method under vehicle load is used to study and analyze the force of cable transfer from cable to tunnel Anchorage of suspension bridge under the most unfavorable vehicle load. Taking the suspension bridge of Baling River in Guizhou as an engineering example, the three-dimensional model of suspension bridge is established and the most unfavorable vehicle load is applied. Finally, the maximum tensile force of the main cable under the most unfavorable vehicle load is obtained. At the same time, the 3D model of rock mass is established, and the maximum main cable tension and the maximum cable force of 3 to 5 times are applied to the anchorages of suspension bridges under the most unfavorable vehicle load. The stability analysis of excavation and backfill of rock mass in Anchorage area is carried out. The conclusion is as follows: from the point of view of displacement and stress of rock mass excavation, the displacement and stress are smaller, and the rock and soil around the anchor hole tend to tilt inward after excavation. In order to ensure the normal construction of the next stage, the reinforcement treatment .02 should be strengthened under the action of 3 to 5 times cable tension, the displacement is smaller, the displacement and stress of the tunnel anchor and rock mass are smaller, and the whole is in a safe state. It does not affect the normal operation of the bridge .03 continues to exert a large cable force. When applied 7 times cable force, plastic zone appears around the excavation rock mass and the interface between the Anchorage area and the surrounding rock. With the increase of cable force, the plastic zone gradually extends to the surrounding rock mass. In this paper, the Anchorage system and surrounding rock of the suspension bridge tunnel in Baling River are evaluated, which provides an important basis for design and construction.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U441;U448.25

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本文編號(hào)：2228396