高填方路堤沉降预估模型对比分析

发布时间：2018-02-07 16:11

本文关键词： 高速公路高填方路堤虚拟仪器变形沉降试验监测数值模拟　出处：《湖北工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：交通对于国民经济有先导和基础的作用,政府由始至终发展经济的重点都是交通运输,因此公路建设是国家基础建设的重中之重。十漫高速公路是位于湖北境内的最西段,它起自十堰市许家棚,接襄十高速公路,途径鄂陕交界处的漫川关,止于商州高速公路。全长107.136公里。项目由于多种因素的影响要具备高要求的施工技术。一是地形地质特殊。整个项目多处存在滑坡、崩塌等不良地质情况。二是工程技术复杂,质量控制难度大。四是施工条件艰难。施工区域远离城区,物资调运困难。全线地表岩石风化程度较严重,但下部岩石完整性一般较好。详细研究了高填方路堤的监测方法和沉降规律,并为预测路堤工后沉降的模型做了深入研究。本文研究内容包括:(1)基于虚拟仪器的研究,针对传统监测方法的不足,设计了一套高填方路堤实时监测系统,拟选传感器采用传感器,传输系统采用了GPRS和北斗卫星导航系统,并将两种传输系统技术融合,提高了虚拟仪器系统采集数据的能力,保障了监测的稳定性。(2)本章依托十漫高速公路建设项目,结合工程实际情况,选取有代表性的几个路段进行研究,其中包括K29+400~500标段的全填方路堤,K32+570~690标段的超高填方路堤,K36+660~900标段的填方路堤,K47+500~600和K47+700~900标段的填方路堤作为研究对象进行沉降试验,包括分层路基沉降剖面沉降仪观测,路基沉降桩测试等。通过对沉降的实验数据的整理和分析,得到了高填方路堤的总沉降量的构成,工后沉降的构成以及影响高填方路堤沉降的因素,并深入分析了路基沉降机理,为以后山区的高填方路堤的沉降做一定程度上的参考。(3)在建立高填方路基沉降预测模型的基础上,根据沉降试验的实测资料,运用Logistic增长模型,指数模型,对数模型以及Compertz成长模型对高填方路堤沉降量预测结果进行对比分析,并建立Logistic—Compertz的组合成长预测模型,Logistic增长预测模型能够收敛于一点,Compertz成长预测模型随时间的增长沉降量无限值,两者可以进行较好的互补。最后利用Logistic增长模型的收敛趋势,帮助组合模型确定收敛时间,再依据计算出的组合模型公式分别预测各监测点的最终沉降量。
[Abstract]:Traffic plays a leading and fundamental role in the national economy. The government's emphasis in developing the economy from beginning to end is transportation, so highway construction is the top priority of national infrastructure. Shi-man Expressway is the westernmost section in Hubei Province. It started from Xujiapeng, Shiyan City, followed by Xiang-Shi Expressway, and passed through the Manchuan pass at the junction of Hubei and Shaanxi. It stops at Shangzhou Expressway. The total length is 107.136 kilometers. The project must have high requirement construction technology because of the influence of many factors. First, the topographic geology is special. There are some bad geological conditions such as landslide and collapse in many places in the whole project. Second, the engineering technology is complex. Quality control is very difficult. Fourth, the construction conditions are difficult. The construction area is far away from the urban area, and the transfer of materials is difficult. The weathering degree of the surface rock on the whole line is serious. However, the integrity of the lower part of the embankment is generally good. The monitoring method and settlement law of the high embankment are studied in detail, and the model of predicting the settlement after the construction of the embankment is studied in depth. The research contents of this paper include: 1) the research based on virtual instrument. Aiming at the deficiency of traditional monitoring method, a real-time monitoring system for high fill embankment is designed. The sensor is chosen, the GPRS and Beidou satellite navigation system are adopted in the transmission system, and the technology of the two transmission systems is combined. The ability of virtual instrument system to collect data is improved, and the stability of monitoring is guaranteed.) in this chapter, based on the construction project of Shi-Man Expressway, several representative sections of highway are selected for research, in combination with the actual situation of the project. The settlement tests were carried out on the embankments including the full fill embankment K32 570,690, the super-high fill embankment K36,660,900, the embankment K47 500600 and the embankment K47,700,900, as the object of study, including the observation of the settlement profile settlement of the layered subgrade. Through the analysis of the experimental data, the composition of the total settlement of the high fill embankment, the composition of the post-construction settlement and the factors affecting the settlement of the high fill embankment are obtained. The mechanism of subgrade settlement is analyzed in depth, which provides a reference for the settlement of high embankment in mountainous area to a certain extent. On the basis of establishing the settlement prediction model of high embankment, the Logistic growth model is used according to the measured data of settlement test. Exponential model, logarithmic model and Compertz growth model are used to analyze the prediction results of settlement of high embankment. The combined growth prediction model of Logistic-Compertz and Logistic growth forecasting model can converge to the infinite value of the growth and settlement with time, and the two models can complement each other well. Finally, the convergent trend of the Logistic growth model is used. The convergence time is determined by the combined model, and the final settlement of each monitoring point is predicted according to the formula of the combined model.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.12

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