【作者】 付宏渊；

【导师】 夏元友；

【作者基本信息】 武汉理工大学 ， 岩土工程， 2006， 博士

【摘要】 随着高等级公路建设在山区的开展，不可避免地会遇到桥头高填路基问题。桥头高填路基集中了许多技术难点，包括了高填方工后沉降控制，桥头跳车问题及桥台台背土压力计算。所以桥头高填路基往往是整条高速公路修建的控制性工程。基于工程实际意义，本文主要从高填路基沉降预测和桥台台背土压力两方面，对桥台高填方路基展开了系统研究。 首先，本文研究了高路堤沉降的变化规律，现有沉降预测方法都有各自的适应性，本文提出了高填方路堤沉降的非等时距皮尔曲线预测模型以及能考虑沉降、观测时间非等时距性、实测沉降数据的不断更新性和填土加载过程影响的高路堤灰色预测模型，并在衡枣、耒宜高速公路三个沉降观测断面进行了应用。由于沉降数据分析的工作量大，本文开发了高路堤沉降预测的可视化操作界面，并应用于工程实例检验预测的效果。本文在非线性Biot固结沉降有限元反分析程序基础上，对邓肯-张E-v和邓肯-张E-B两种非线性模型的计算参数进行了灵敏度分析，确定反演参数，然后以实际工程为例研究了参数反分析问题求解的方法。 本文以耒宜与衡枣两条高速公路沉降观测资料和路面状况调查为依据，分析研究了不同土质、不同填方高度对高路堤沉降稳定时间、工后沉降及路面质量的影响，提出了刚性路面底基层、基层和面层施工的沉降控制取值标准。通过桥头搭板的受力分析，研究了板下脱空长度与台背工后沉降的关系，同时认为台背路基最大工后沉降允许值的取值标准为搭板最大挠曲变形量的2倍。 台背为高填方的桥台其填料选择、施工控制和质量监测都不同于常规桥台，本文以一现场桥台土压力试验为依托，研究了桥台土压力的测试方法和试验细则，通过现场的长期测试，得到桥台台背土压力的实际大小和分布，对测试结果进行了系统分析，研究了台背土压力随填土高度的变化规律和随时间的变化规律。同时，本文针对了试验桥台及台后填土的特点建立了有限元模型，得出了桥台台背静止土压力分布和台背土压力随桥台位移的变化规律，有限元的计算结果与土压力试验结果相接近，进一步验证了试验结果的可靠性。更多还原

【Abstract】 With the construction of highway developing in the mountains, high filling embankment behind abutment will be inevitably encountered. The construction of high filling embankment behind abutment has many difficulties in technology, which involve the control of workable settlement, the problem of bump at bridge-head and the calculation of earth pressure behind abutment. High filling embankment behind abutment is always a critical project to the construction of the whole freeway. Considering its practical meaning, from the aspects of settlement prediction and earth pressure behind abutment, high filling embankment behind abutment is systematically studied in the thesis.At first, the settlement variable rule of high filling embankment is studied. Existing settlement prediction methods have their own adaptability. Peal curve prediction model of unequal time span is established to predict settlement of high filling embankment. Beside this, grey prediction model is also put forward that can consider the unequal span of observing time, the continuous renew of the settlement data and the influence of the loading of filling. The two methods are both applied in the settlement prediction of three section of Hengyang-Zaomupu freeway and Leiyang-Yizhang freeway. Because settlement data analysis needs too much time, video operating interface for settlement prediction of high filling embankment is developed. The interface is applied in the settlement prediction of practical project to prove its reliability. Based on finite element back-analysis procedure of Biot nonlinearity consolidation settlement, the sensitivity of the calculation parameters of E-v model and E-B model is analyzed. The solution of the problem of back-analysis is studied through practical projects.Based on settlement observation data and pavement condition survey of Leiyang-Yizhang freeway and Hengyang-Zaomupu freeway, the influence of different soils and different fill height on settlement stability time, workable settlement and pavement quality of high embankment is analyzed. Furthermore value standard for settlement control of construction of rigid pavement sub-base, base course and surface course is proposed. Through the mechanic analysis of approach slab, the relation of the length of void beneath slab and workable settlement is studied. At the same time, it deduce that allowable value standard of workable settlement is two times of更多还原