【摘要】：到目前為止國(guó)內(nèi)外針對(duì)建筑物、水體以及鐵路下壓煤開采的研究比較多，但針對(duì)在高速公路橋梁壓煤開采的研究還比較少，分析理論還不夠完善。煤炭作為我國(guó)主要能源，隨著社會(huì)經(jīng)濟(jì)的快速發(fā)展，需求量越來(lái)越大，其不可再生性要求盡可能的開采出煤炭資源，但是受地質(zhì)構(gòu)造控制，煤層的采動(dòng)后對(duì)高速公路橋梁的影響必須充分研究，并在設(shè)計(jì)中提出針對(duì)性適應(yīng)措施，方能確保高速公路橋梁的運(yùn)營(yíng)安全。 本文以南川至萬(wàn)盛高速公路為依托，在分析壓覆煤層采動(dòng)后地表移動(dòng)和變形的基礎(chǔ)上，根據(jù)唐山院預(yù)測(cè)分析工作得出來(lái)的各個(gè)受影響橋梁布置點(diǎn)的具體的下沉、傾斜等預(yù)計(jì)變形數(shù)值，統(tǒng)計(jì)分析南萬(wàn)高速公路橋梁結(jié)構(gòu)受采動(dòng)沉降、傾斜、水平移動(dòng)等變形的影響最不利的情況，，運(yùn)用ABAQUS模擬這些最不利的情況，計(jì)算驗(yàn)算受影響橋梁結(jié)構(gòu)的安全性。根據(jù)安全性的驗(yàn)算結(jié)果，對(duì)橋梁結(jié)構(gòu)提出必要的措施來(lái)適應(yīng)煤層開采后的變形，為類似高速公路橋梁設(shè)計(jì)提供參考。主要的研究?jī)?nèi)容包括： ①以重慶南萬(wàn)高速公路為典型實(shí)例，通過(guò)對(duì)沿線路段的地質(zhì)構(gòu)造、地層、水文的勘察及煤層分布與橋梁位置關(guān)系的分析，論述了橋梁煤層開采地質(zhì)的復(fù)雜性； ②根據(jù)各個(gè)受影響橋梁布置點(diǎn)的具體沉降、傾斜、水平移動(dòng)數(shù)據(jù)，分別繪制出各座橋梁布置點(diǎn)的沉降、傾斜、水平移動(dòng)曲線圖，分析對(duì)比這些因素，得出橋梁結(jié)構(gòu)產(chǎn)生最不利的影響的結(jié)構(gòu)工況例如縱向、橫向傾斜會(huì)使橋墩偏心受壓； ③將各種最不利的沉降、傾斜、水平移動(dòng)對(duì)橋梁結(jié)構(gòu)的梁體、橋墩、支座等的影響，運(yùn)用ABAQUS進(jìn)行模擬，分析計(jì)算橋梁結(jié)構(gòu)受到這些不利情況的應(yīng)力、應(yīng)變情況，驗(yàn)算其安全性； ④根據(jù)驗(yàn)算的安全性結(jié)果，以及模型的破壞規(guī)律，提出相應(yīng)的必要措施來(lái)適應(yīng)煤層開采后的變形，保證高速公路橋梁能夠安全運(yùn)營(yíng)。
[Abstract]:Up to now, there are many researches on coal mining under buildings, water bodies and railways at home and abroad, but there are few researches on coal mining in expressway bridges, and the theory of analysis is not perfect. As the main energy in our country, with the rapid development of social economy, the demand for coal is increasing. Its non-renewable requirement is to exploit coal resources as far as possible, but it is controlled by geological structure. The influence of coal seam mining on highway bridge must be fully studied, and appropriate measures should be put forward in the design to ensure the safety of highway bridge operation. Based on Nanchuan to Wansheng Expressway, based on the analysis of ground surface movement and deformation after mining of overlying coal seam, the concrete subsidence of each affected bridge layout point is obtained according to the prediction and analysis work of Tangshan Yuan. The predicted deformation values such as inclination, etc., statistical analysis of the most disadvantageous conditions of the bridge structure of Nan-Wan Expressway affected by mining subsidence, inclination, horizontal movement, etc., using Abaqus to simulate these most disadvantageous conditions. Calculate the safety of the affected bridge structure. According to the results of safety check, the necessary measures for bridge structure are put forward to adapt to the deformation of coal seam after mining, which provides a reference for the bridge design of similar highway. The main research contents are as follows: 1 taking Nanwan Expressway in Chongqing as a typical example, by analyzing the geological structure, strata, hydrological investigation and the relationship between coal seam distribution and bridge location, The complexity of bridge coal seam mining geology is discussed, 2 according to the specific settlement, tilt and horizontal movement data of each affected bridge layout point, the settlement, inclination and horizontal movement curve of each bridge layout point are drawn respectively. By analyzing and comparing these factors, it is concluded that the structural conditions which have the most adverse effects on the bridge structure, such as longitudinal, transverse tilt, will make the pier eccentric under pressure; (3) the most unfavorable settlement, inclination, etc. The influence of horizontal movement on the beam, pier and support of bridge structure is simulated by Abaqus to analyze and calculate the stress and strain of bridge structure subjected to these adverse conditions, and to check its safety. 4According to the safety result of checking calculation and the damage rule of the model, the necessary measures are put forward to adapt to the deformation after coal seam mining and to ensure the safe operation of highway bridge.
【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】：2014
【分類號(hào)】：U442.5

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本文編號(hào)：2137383