高填方路基工后沉降監(jiān)測及預(yù)測對比分析
發(fā)布時(shí)間：2019-05-24 21:33
【摘要】：我國由于地域面積遼闊,在高速公路建設(shè)中所遇問題也有很大差異。而高填方路基的沉降變形是路基工程中常見的通病之一,其原因不僅與路基的壓實(shí)度和原有路基坡度有關(guān),而且還與地質(zhì)條件、填料的性質(zhì)、施工技術(shù)等因素有關(guān)。高填方路基的變形破壞主要表現(xiàn)為:路基的不均勻沉降(填土路基的整體沉降和局部結(jié)構(gòu)層破壞)、路面的開裂、邊坡的崩塌等。鑒于此,為有效降低高填方路基的沉降變形,本文以蘭永一級公路為研究對象,開展高填方路基工程的現(xiàn)場沉降監(jiān)測、沉降規(guī)律特性的研究以及數(shù)值分析填方體沉降的影響因素研究。在國內(nèi)外研究成果的基礎(chǔ)上,借助單點(diǎn)沉降計(jì)和FLAC3D有限元軟件,對高填方路基工程中所遇的軟土地基的處治方法、沉降預(yù)測模型、填方路基的沉降因素進(jìn)行詳細(xì)的研究,具體的工作與成果如下:1.首先從理論角度出發(fā),分析軟土路基失穩(wěn)破壞的變形機(jī)理,并分析介紹目前常用軟土路基的處治方法;其次以組成土成份的角度考慮,分析軟土的壓縮特性和水平側(cè)向變形,進(jìn)而分析其主要變形規(guī)律特性;最后根據(jù)軟土在工程方面的特性,分析介紹處理軟土的工程方法與相應(yīng)方法的使用范圍和原理。2.在高填方路基中布置沉降磁環(huán)并設(shè)置沉降監(jiān)測點(diǎn),即分別在路肩位置與超車道位置埋設(shè)單點(diǎn)沉降計(jì),采用單點(diǎn)沉降計(jì)對填方路基各個(gè)測點(diǎn)的工后沉降進(jìn)行歷時(shí)一年的原位監(jiān)測,以現(xiàn)場沉降實(shí)測資料為研究基礎(chǔ),通過研究探討填土路基的沉降機(jī)理,進(jìn)而主要分析其填方體的沉降變形規(guī)律。3.根據(jù)現(xiàn)場實(shí)測沉降監(jiān)測數(shù)據(jù),運(yùn)用Origin軟件(Origin8.5)對高填方路基工后沉降進(jìn)行曲線擬合,從而建立四種沉降預(yù)測模型。對比實(shí)測值與預(yù)測值,并且計(jì)算出每種預(yù)測模型的預(yù)測精度(相關(guān)系數(shù)R2)進(jìn)行比較分析,由其分析結(jié)果提出一種新的組合模型:指數(shù)-雙曲線模型。在利用最小二乘法原理的基礎(chǔ)上,結(jié)合Matlab2012B編制的計(jì)算程序,最終確定出模型的權(quán)重系數(shù)(W)。4.在現(xiàn)場實(shí)測沉降監(jiān)測的基礎(chǔ)上,結(jié)合有限差分軟件FLAC3D,分析探討不同填筑高度、不同坡度、不同填料對高填方路基沉降的影響。利用模擬規(guī)律,結(jié)合Origin軟件(Origin8.5)擬合路基坡度與水平位移和路基總沉降的表達(dá)式,為高填方工程在施工中提供一定的指導(dǎo)。5.在對高填方路基沉降問題數(shù)值分析的基礎(chǔ)上,并與蘭永一級公路第4標(biāo)段高填方路基現(xiàn)場沉降監(jiān)測結(jié)果對比分析,其結(jié)果表明:二者曲線形態(tài)一致,可清晰的反應(yīng)路基實(shí)際施工過程,較準(zhǔn)確的預(yù)測出高填方路基的最終沉降,為實(shí)際工程提供一定的指導(dǎo)作用。
[Abstract]:Due to the vast area of our country, there are also great differences in the problems encountered in highway construction. The settlement and deformation of high fill subgrade is one of the common problems in subgrade engineering, which is related not only to the compactness of subgrade and the slope of original subgrade, but also to the geological conditions, the nature of packing, construction technology and so on. The deformation and failure of high fill subgrade are mainly manifested as follows: uneven settlement of subgrade (overall settlement of filled subgrade and failure of local structural layer), cracking of pavement, collapse of slope and so on. In view of this, in order to effectively reduce the settlement and deformation of high fill subgrade, this paper takes Lanyong first grade highway as the research object, and carries out the field settlement monitoring of high fill subgrade project. Study on the characteristics of settlement law and numerical analysis of the influencing factors of settlement of fill. On the basis of domestic and foreign research results, with the help of single point settlement meter and FLAC3D finite element software, the treatment method of soft soil foundation encountered in high fill subgrade engineering, settlement prediction model and settlement factors of fill subgrade are studied in detail. The specific work and results are as follows: 1. Firstly, from the theoretical point of view, the deformation mechanism of instability and failure of soft soil subgrade is analyzed, and the treatment methods of soft soil subgrade are analyzed and introduced. Secondly, from the point of view of soil composition, the compression characteristics and horizontal lateral deformation of soft soil are analyzed, and then the main deformation characteristics of soft soil are analyzed. Finally, according to the engineering characteristics of soft soil, this paper analyzes and introduces the engineering method of dealing with soft soil and the application scope and principle of the corresponding method. A settlement magnetic ring is arranged in the high fill subgrade and a settlement monitoring point is set up, that is, a single point settlement meter is buried in the shoulder position and the superlane position respectively, and the post-construction settlement of each test point of the fill subgrade is monitored in situ for one year. Based on the measured settlement data in the field, the settlement mechanism of the fill subgrade is discussed, and then the settlement deformation law of the fill body is mainly analyzed. 3. According to the measured settlement monitoring data, Origin software (Origin8.5) is used to fit the post-construction settlement of high fill subgrade, and four kinds of settlement prediction models are established. The prediction accuracy (correlation coefficient R2) of each prediction model is compared and analyzed by comparing the measured values with the predicted values, and a new combined model, exponential hyperbolic model, is proposed from the analysis results. Based on the principle of least square method and the calculation program compiled by Matlab2012B, the weight coefficient (W). 4 of the model is finally determined. On the basis of field measured settlement monitoring, combined with finite difference software FLAC3D, analysis, the effects of different filling height, different slope and different filling on the settlement of high fill subgrade are discussed. By using the simulation law and Origin software (Origin8.5), the expressions of subgrade slope, horizontal displacement and total subgrade settlement are fitted, which provides some guidance for the construction of high fill project. 5. Based on the numerical analysis of the settlement problem of high fill subgrade, and compared with the field settlement monitoring results of high fill subgrade in the fourth section of Lanyong first grade highway, the results show that the shape of the two curves is the same. It can clearly reflect the actual construction process of subgrade, accurately predict the final settlement of high fill subgrade, and provide certain guidance for the actual project.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U416.1
本文編號：2485195
[Abstract]:Due to the vast area of our country, there are also great differences in the problems encountered in highway construction. The settlement and deformation of high fill subgrade is one of the common problems in subgrade engineering, which is related not only to the compactness of subgrade and the slope of original subgrade, but also to the geological conditions, the nature of packing, construction technology and so on. The deformation and failure of high fill subgrade are mainly manifested as follows: uneven settlement of subgrade (overall settlement of filled subgrade and failure of local structural layer), cracking of pavement, collapse of slope and so on. In view of this, in order to effectively reduce the settlement and deformation of high fill subgrade, this paper takes Lanyong first grade highway as the research object, and carries out the field settlement monitoring of high fill subgrade project. Study on the characteristics of settlement law and numerical analysis of the influencing factors of settlement of fill. On the basis of domestic and foreign research results, with the help of single point settlement meter and FLAC3D finite element software, the treatment method of soft soil foundation encountered in high fill subgrade engineering, settlement prediction model and settlement factors of fill subgrade are studied in detail. The specific work and results are as follows: 1. Firstly, from the theoretical point of view, the deformation mechanism of instability and failure of soft soil subgrade is analyzed, and the treatment methods of soft soil subgrade are analyzed and introduced. Secondly, from the point of view of soil composition, the compression characteristics and horizontal lateral deformation of soft soil are analyzed, and then the main deformation characteristics of soft soil are analyzed. Finally, according to the engineering characteristics of soft soil, this paper analyzes and introduces the engineering method of dealing with soft soil and the application scope and principle of the corresponding method. A settlement magnetic ring is arranged in the high fill subgrade and a settlement monitoring point is set up, that is, a single point settlement meter is buried in the shoulder position and the superlane position respectively, and the post-construction settlement of each test point of the fill subgrade is monitored in situ for one year. Based on the measured settlement data in the field, the settlement mechanism of the fill subgrade is discussed, and then the settlement deformation law of the fill body is mainly analyzed. 3. According to the measured settlement monitoring data, Origin software (Origin8.5) is used to fit the post-construction settlement of high fill subgrade, and four kinds of settlement prediction models are established. The prediction accuracy (correlation coefficient R2) of each prediction model is compared and analyzed by comparing the measured values with the predicted values, and a new combined model, exponential hyperbolic model, is proposed from the analysis results. Based on the principle of least square method and the calculation program compiled by Matlab2012B, the weight coefficient (W). 4 of the model is finally determined. On the basis of field measured settlement monitoring, combined with finite difference software FLAC3D, analysis, the effects of different filling height, different slope and different filling on the settlement of high fill subgrade are discussed. By using the simulation law and Origin software (Origin8.5), the expressions of subgrade slope, horizontal displacement and total subgrade settlement are fitted, which provides some guidance for the construction of high fill project. 5. Based on the numerical analysis of the settlement problem of high fill subgrade, and compared with the field settlement monitoring results of high fill subgrade in the fourth section of Lanyong first grade highway, the results show that the shape of the two curves is the same. It can clearly reflect the actual construction process of subgrade, accurately predict the final settlement of high fill subgrade, and provide certain guidance for the actual project.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U416.1
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 朱彥鵬;陳琰嬌;;蘭永公路軟土地基處理后的沉降預(yù)測研究[J];路基工程;2017年01期
2 朱彥鵬;蔡文霄;楊校輝;;高填方路堤沉降模型現(xiàn)場試驗(yàn)[J];建筑科學(xué)與工程學(xué)報(bào);2017年01期
3 王濤;;路基沉降影響因素分析[J];北方交通;2016年07期
4 李慧潔;巨玉文;王文正;鄭雪梅;;幾種黃土高填方路堤沉降預(yù)測模型的對比研究[J];中國科技論文;2016年01期
5 李爽;郭曉昕;王文國;高艷平;;星野法在某發(fā)電廠地基沉降預(yù)測中的應(yīng)用[J];水利科技與經(jīng)濟(jì);2015年08期
6 霍曉龍;陳壽根;衛(wèi)苗苗;趙玉報(bào);;基于FLAC3D的季節(jié)凍土路基凍融變形分析[J];地下空間與工程學(xué)報(bào);2015年03期
7 趙國旺;;CFG樁在高等級公路地基加固中的應(yīng)用[J];公路交通科技(應(yīng)用技術(shù)版);2015年06期
8 肖衡林;李麗華;郭小川;馬強(qiáng);;山區(qū)高填方路堤沉降預(yù)測方法[J];應(yīng)用基礎(chǔ)與工程科學(xué)學(xué)報(bào);2015年01期
9 李白露;;改進(jìn)的“三點(diǎn)法”預(yù)測模型在高速鐵路橋梁沉降觀測中的應(yīng)用研究[J];高速鐵路技術(shù);2014年04期
10 張成良;;兩種預(yù)測軟基沉降方法的對比分析[J];路基工程;2013年04期
相關(guān)博士學(xué)位論文 前3條
1 谷復(fù)光;吉林省某路段高填方路基沉降分析與研究[D];吉林大學(xué);2011年
2 孫昊月;堆載預(yù)壓法處理軟土地基沉降量預(yù)測研究[D];吉林大學(xué);2010年
3 張軍輝;軟土地基上高速公路加寬變形特性及差異沉降控制標(biāo)準(zhǔn)研究[D];東南大學(xué);2006年
相關(guān)碩士學(xué)位論文 前5條
1 陳琰嬌;某一級公路軟基處理及沉降預(yù)測研究[D];蘭州理工大學(xué);2016年
2 劉望坤;山區(qū)高速公路軟土路基變形特性研究[D];重慶交通大學(xué);2013年
3 曾煒;CFG樁在軟土地基處理中的應(yīng)用研究[D];重慶交通大學(xué);2012年
4 鐘麗;高速公路路基沉降計(jì)算及不均勻沉降對路面結(jié)構(gòu)影響研究[D];中南大學(xué);2012年
5 袁輝明;高速公路運(yùn)營期軟土路基沉降監(jiān)測與預(yù)測[D];華南理工大學(xué);2010年
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