高填方路基工后沉降监测及预测对比分析
发布时间：2019-05-24 21:33
【摘要】：我国由于地域面积辽阔,在高速公路建设中所遇问题也有很大差异。而高填方路基的沉降变形是路基工程中常见的通病之一,其原因不仅与路基的压实度和原有路基坡度有关,而且还与地质条件、填料的性质、施工技术等因素有关。高填方路基的变形破坏主要表现为:路基的不均匀沉降(填土路基的整体沉降和局部结构层破坏)、路面的开裂、边坡的崩塌等。鉴于此,为有效降低高填方路基的沉降变形,本文以兰永一级公路为研究对象,开展高填方路基工程的现场沉降监测、沉降规律特性的研究以及数值分析填方体沉降的影响因素研究。在国内外研究成果的基础上,借助单点沉降计和FLAC3D有限元软件,对高填方路基工程中所遇的软土地基的处治方法、沉降预测模型、填方路基的沉降因素进行详细的研究,具体的工作与成果如下:1.首先从理论角度出发,分析软土路基失稳破坏的变形机理,并分析介绍目前常用软土路基的处治方法;其次以组成土成份的角度考虑,分析软土的压缩特性和水平侧向变形,进而分析其主要变形规律特性;最后根据软土在工程方面的特性,分析介绍处理软土的工程方法与相应方法的使用范围和原理。2.在高填方路基中布置沉降磁环并设置沉降监测点,即分别在路肩位置与超车道位置埋设单点沉降计,采用单点沉降计对填方路基各个测点的工后沉降进行历时一年的原位监测,以现场沉降实测资料为研究基础,通过研究探讨填土路基的沉降机理,进而主要分析其填方体的沉降变形规律。3.根据现场实测沉降监测数据,运用Origin软件(Origin8.5)对高填方路基工后沉降进行曲线拟合,从而建立四种沉降预测模型。对比实测值与预测值,并且计算出每种预测模型的预测精度(相关系数R2)进行比较分析,由其分析结果提出一种新的组合模型:指数-双曲线模型。在利用最小二乘法原理的基础上,结合Matlab2012B编制的计算程序,最终确定出模型的权重系数(W)。4.在现场实测沉降监测的基础上,结合有限差分软件FLAC3D,分析探讨不同填筑高度、不同坡度、不同填料对高填方路基沉降的影响。利用模拟规律,结合Origin软件(Origin8.5)拟合路基坡度与水平位移和路基总沉降的表达式,为高填方工程在施工中提供一定的指导。5.在对高填方路基沉降问题数值分析的基础上,并与兰永一级公路第4标段高填方路基现场沉降监测结果对比分析,其结果表明:二者曲线形态一致,可清晰的反应路基实际施工过程,较准确的预测出高填方路基的最终沉降,为实际工程提供一定的指导作用。
[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.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.1
本文编号：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.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.1
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