龙永高速典型特殊土路基沉降特性研究
发布时间：2019-05-07 17:47
【摘要】：近年来,全国各类基础建设的重心开始由东部向西部转移,在湖南省内高速公路修建的趋势也在于此。然而不同土质在不同地区的工程应用情况有着明显差异,其他地区的不良土质工程施工经验不能直接照搬至西部山区的高速公路建设中来,因此,如何对山区高速公路建设中遇到的因不良土质填筑而引起的路堤稳定性问题进行有效判定并提出相应的处治措施和效果评价这方面的研究是必不可少的。本文以湘西自治州在建龙永高速公路工程为依托,对建设过程中两类典型特殊土的基本工程特性及其路基沉降变形机理进行了研究,较为全面的分析了路基沉降的影响因素；选取两类典型断面进行路基稳定性监测并分析了监测手段的优缺点及适用性；根据实测数据,采用灰色理论的GM(1,1)模型对路基未来一段时间后的沉降进行预测并依据预测的结果对这两类典型路基的稳定性进行判定；结合灰色预测模型判定的结果与各自的工程实际情况,提出针对于这两类路基各自不同情况的处治措施；针对现行路基稳定性判定规范中未考虑多项影响因素的差异性在沉降速率这一表征指标中所体现出的区别,而只是给出一个唯一限值的缺陷,引入加速度判定方法,通过侧向水平位移加速度和路堤中心沉降加速度的正负性来判定路基是否稳定,并结合工程经验与两类典型路基的工程实际情况,给出了针对该两类典型路基各自的稳定性判定阈值,并运用灰色系统理论Verhulst模型检验判定阈值标准的可靠性,以此为及时预警提供一定的参考依据。
[Abstract]:In recent years, the center of gravity of all kinds of national infrastructure began to shift from the east to the west, and the trend of highway construction in Hunan Province also lies in this trend. However, there are obvious differences in the engineering application of different soil quality in different areas, and the bad soil engineering construction experience in other areas can not be directly copied to the highway construction in the western mountainous areas, so the construction experience of bad soil engineering in other areas cannot be directly copied to the highway construction in the western mountain area. How to effectively judge the stability of embankment caused by bad soil filling in highway construction in mountain area and put forward the corresponding treatment measures and evaluation of the effect is necessary. In this paper, based on the Longyong expressway project under construction in Xiangxi Autonomous Prefecture, the basic engineering characteristics of two kinds of typical special soil and the deformation mechanism of subgrade settlement are studied, and the influencing factors of roadbed settlement are analyzed in an all-round way. Two kinds of typical sections are selected to monitor the stability of roadbed and the advantages and disadvantages and applicability of monitoring methods are analyzed. According to the measured data, the GM (1,1) model of grey theory is used to predict the settlement of roadbed after a period of time, and the stability of the two typical roadbed is determined according to the predicted results. Combined with the results of the grey prediction model and the actual situation of each project, the treatment measures for the two kinds of roadbed are put forward according to the different conditions of the two kinds of roadbed. In view of the difference in settlement rate which is not taken into account in the existing criterion for determining roadbed stability, the method of acceleration judgment is introduced, which only gives a unique limit value of the defect, and introduces the method of acceleration determination, which is not considered in the current criterion of roadbed stability. The stability of roadbed is judged by the acceleration of lateral horizontal displacement and the acceleration of central settlement of embankment, and combined with the engineering experience and the actual situation of two kinds of typical roadbed, The stability threshold values of the two typical roadbed are given, and the reliability of the threshold standard is tested by using the grey system theory Verhulst model, which provides a certain reference basis for the timely early warning.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1
，
本文编号：2471273
[Abstract]:In recent years, the center of gravity of all kinds of national infrastructure began to shift from the east to the west, and the trend of highway construction in Hunan Province also lies in this trend. However, there are obvious differences in the engineering application of different soil quality in different areas, and the bad soil engineering construction experience in other areas can not be directly copied to the highway construction in the western mountainous areas, so the construction experience of bad soil engineering in other areas cannot be directly copied to the highway construction in the western mountain area. How to effectively judge the stability of embankment caused by bad soil filling in highway construction in mountain area and put forward the corresponding treatment measures and evaluation of the effect is necessary. In this paper, based on the Longyong expressway project under construction in Xiangxi Autonomous Prefecture, the basic engineering characteristics of two kinds of typical special soil and the deformation mechanism of subgrade settlement are studied, and the influencing factors of roadbed settlement are analyzed in an all-round way. Two kinds of typical sections are selected to monitor the stability of roadbed and the advantages and disadvantages and applicability of monitoring methods are analyzed. According to the measured data, the GM (1,1) model of grey theory is used to predict the settlement of roadbed after a period of time, and the stability of the two typical roadbed is determined according to the predicted results. Combined with the results of the grey prediction model and the actual situation of each project, the treatment measures for the two kinds of roadbed are put forward according to the different conditions of the two kinds of roadbed. In view of the difference in settlement rate which is not taken into account in the existing criterion for determining roadbed stability, the method of acceleration judgment is introduced, which only gives a unique limit value of the defect, and introduces the method of acceleration determination, which is not considered in the current criterion of roadbed stability. The stability of roadbed is judged by the acceleration of lateral horizontal displacement and the acceleration of central settlement of embankment, and combined with the engineering experience and the actual situation of two kinds of typical roadbed, The stability threshold values of the two typical roadbed are given, and the reliability of the threshold standard is tested by using the grey system theory Verhulst model, which provides a certain reference basis for the timely early warning.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1
，
本文编号：2471273
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