本文關(guān)鍵詞：柴汶河大橋下伏采空區(qū)橋梁地基沉降變形規(guī)律研究及穩(wěn)定性評(píng)價(jià)　出處：《西南交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 采空區(qū) 地基 沉降變形 穩(wěn)定性

【摘要】：采空區(qū)在我國分部較廣。隨著社會(huì)現(xiàn)代化進(jìn)程的加快,公路、鐵路、橋梁、隧道等基礎(chǔ)設(shè)施的建設(shè)日新月異,有的不得不在采空區(qū)上進(jìn)行。新泰市向陽路柴汶河大橋?yàn)?-20m鋼筋混凝土簡支梁,位于新泰市東都鎮(zhèn)東臨。橋址區(qū)主要位于華源煤礦(原張莊煤礦)開采范圍內(nèi)。該處采空區(qū)開采年代久遠(yuǎn),在開采過程中多次重復(fù)采動(dòng)、多層開采,并且受汶南F1斷層影響,使得采空區(qū)分布規(guī)律及特點(diǎn)更加復(fù)雜,嚴(yán)重影響橋梁安全。論文針對(duì)采空區(qū)橋梁地基進(jìn)行研究,進(jìn)行了如下研究工作。(1)對(duì)影響橋梁地基沉降的因素進(jìn)行研究,并找出主要因素。(2)研究采空區(qū)的分布規(guī)律,包括空間分布形態(tài)、頂板管理方式、圍巖結(jié)構(gòu)類型及其物理力學(xué)性質(zhì)等特征。(3)確定進(jìn)行橋梁地基沉降分析的工況條件。利用UDEC離散元程序,分析研究在4種不同工況條件下橋梁地基的沉降變形規(guī)律。(4)研究在不同工況條件下橋基的穩(wěn)定性,并對(duì)注漿治理效果進(jìn)行模擬研究。通過開采條件判別法和概率積分法分別對(duì)研究區(qū)域作定性、定量評(píng)價(jià),研究區(qū)域作為建筑場地屬于不穩(wěn)定場地,作為橋梁地基屬于不穩(wěn)定地基,兩種評(píng)價(jià)方法結(jié)果一致。根據(jù)UDEC模擬計(jì)算結(jié)果,在采空區(qū)及巖溶未注漿工況下,建筑場地存在較大的剩余下沉量、剩余傾斜值和剩余水平變形值,為不穩(wěn)定場地(地基)。在采空區(qū)及巖溶頂板處存在較為明顯的邊界滑動(dòng)和屈服現(xiàn)象,有較大的剪切位移,應(yīng)力場在采空區(qū)及巖溶頂板產(chǎn)生應(yīng)力集中,頂板兩端的最小主應(yīng)力為拉應(yīng)力,在采空區(qū)及巖溶附近區(qū)域沉降突然增大,使得沉降變形在垂向上不連續(xù)。在采空區(qū)及巖溶均注漿工況下,建筑場地剩余下沉量、剩余傾斜值和剩余水平變形值明顯減小,為穩(wěn)定場地(地基)。巖體中不存在較為明顯的邊界滑動(dòng)和屈服現(xiàn)象,剪切位移幾乎為零,應(yīng)力集中現(xiàn)象消失,無拉應(yīng)力出現(xiàn)。該類工況下巖體沉降變形過程實(shí)際為固結(jié)壓密過程,變形曲線符合固結(jié)壓密特征。通過對(duì)比分析注漿前和注漿后不同工況下的模擬計(jì)算結(jié)果,表明采用注漿方法能大幅度降低橋基的沉降變形,使得原本不穩(wěn)定的橋基變?yōu)榉�(wěn)定,且工程效果比較理想。通過研究可以看出,影響橋梁地基穩(wěn)定性的主要因素為采空區(qū)及巖溶的存在以及施加的橋梁荷載,而注漿方法對(duì)于控制橋梁基礎(chǔ)的沉降變形效果明顯,使橋基沉降變形在容許范圍之內(nèi)。
[Abstract]:With the rapid development of social modernization, the construction of highway, railway, bridge, tunnel and other infrastructure is changing with each passing day. Some have to be carried out in the goaf. The Chai Wenhe Bridge in Xiangyang Road Xintai City is a 6-20m reinforced concrete simply supported beam. Located in the east of Dongdu Town, Xintai City. The bridge site area is mainly located in the mining area of Huayuan Coal Mine (former Zhangzhuang Coal Mine). Under the influence of F1 fault of Wennan, the distribution law and characteristics of goaf are more complex, which seriously affect the safety of bridge. This paper studies the foundation of bridge in goaf. The research work is as follows: 1) study the factors that affect the settlement of bridge foundation, and find out the main factors. 2) study the distribution law of goaf, including spatial distribution form, roof management mode. The structural type of surrounding rock and its physical and mechanical properties are used to determine the working conditions of bridge foundation settlement analysis. UDEC discrete element program is used. The stability of bridge foundation under different working conditions is studied by analyzing and studying the settlement and deformation law of bridge foundation under four different working conditions. Through mining condition discrimination method and probability integration method, the study area is evaluated qualitatively and quantitatively, and the research area as a construction site belongs to unstable site. As the bridge foundation belongs to unstable foundation, the results of the two evaluation methods are consistent. According to the results of UDEC simulation, under the conditions of goaf and karst ungrouting, there is a large residual subsidence in the construction site. The residual tilting value and the residual horizontal deformation value are unstable sites (ground). There are obvious boundary sliding and yielding phenomena in goaf and karst roof, and large shear displacement. The stress field produces stress concentration in goaf and karst roof, the minimum principal stress at both ends of roof is tensile stress, and the settlement increases suddenly in goaf and near karst area. The settlement deformation is discontinuous in vertical direction. Under the conditions of goaf and karst grouting, the residual subsidence, residual tilt value and residual horizontal deformation value of the construction site are obviously reduced. In order to stabilize the site, there is no obvious boundary slip and yield phenomenon in the rock mass, the shear displacement is almost zero, and the stress concentration disappears. The deformation curve accords with the characteristics of consolidation and compaction. The simulation results before and after grouting are compared and analyzed. The results show that the grouting method can greatly reduce the settlement deformation of the bridge foundation, make the original unstable bridge foundation become stable, and the engineering effect is satisfactory. The main factors affecting the stability of bridge foundation are the existence of goaf and karst and the applied bridge load, while the grouting method has obvious effect on controlling the settlement and deformation of bridge foundation. The settlement deformation of the bridge foundation is within the allowable range.
【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)】：U443.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王云廣;張子月;;地下水活動(dòng)對(duì)采空區(qū)覆巖移動(dòng)影響機(jī)理分析[J];南水北調(diào)與水利科技;2015年04期

2 王鵬;余學(xué)義;劉俊;;淺埋煤層大采高開采地表裂縫破壞機(jī)理研究[J];煤炭工程;2014年05期

3 黃太武;;高速鐵路采空區(qū)橋基沉降變形數(shù)值模擬分析[J];鐵道標(biāo)準(zhǔn)設(shè)計(jì);2014年03期

4 劉占魁;劉冰蕾;王瑞智;張朋;;國內(nèi)礦山開采沉陷的主要研究方法及應(yīng)用情況[J];西部探礦工程;2011年01期

5 張耀平;曹平;袁海平;董隴軍;;復(fù)雜采空區(qū)穩(wěn)定性數(shù)值模擬分析[J];采礦與安全工程學(xué)報(bào);2010年02期

6 范洪冬;張宏貞;鄧喀中;;老采空區(qū)殘余沉降預(yù)測參數(shù)研究[J];金屬礦山;2009年01期

7 孫超;薄景山;孫有為;;采空區(qū)沉陷研究歷史及現(xiàn)狀[J];防災(zāi)科技學(xué)院學(xué)報(bào);2008年04期

8 伍永田;張旭生;李曉蕓;;采空區(qū)塌陷的離散元模擬[J];采礦技術(shù);2008年01期

9 郭惟嘉,王勇義;采空區(qū)上方修建大型建筑物地基穩(wěn)定性評(píng)價(jià)[J];巖土力學(xué);2004年S1期

10 楊逾,劉文生,馮國才;地下水位下降對(duì)采礦覆巖下沉影響探析[J];中國地質(zhì)災(zāi)害與防治學(xué)報(bào);2004年02期

相關(guān)博士學(xué)位論文 前4條

1 彭永良;鐵路路基下伏多層大型采空區(qū)治理關(guān)鍵技術(shù)研究[D];西南交通大學(xué);2013年

2 彭帥英;高速公路下伏多層采空區(qū)地表沉陷數(shù)值模擬及預(yù)測研究[D];吉林大學(xué);2013年

3 王正帥;老采空區(qū)殘余沉降非線性預(yù)測理論及應(yīng)用研究[D];中國礦業(yè)大學(xué);2011年

4 吳啟紅;礦山復(fù)雜多層采空區(qū)穩(wěn)定性綜合分析及安全治理研究[D];中南大學(xué);2010年

相關(guān)碩士學(xué)位論文 前2條

1 姚康;采空區(qū)地表變形的機(jī)理及數(shù)值模擬研究[D];吉林大學(xué);2014年

2 馬云龍;采空區(qū)穩(wěn)定性分析及影響因子研究[D];中南大學(xué);2010年

，

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