桥涵台后沉降病害防治技术研究

【作者】 岳鹏飞；

【导师】 申爱琴；

【作者基本信息】 长安大学 ， 材料学， 2003， 硕士

【摘要】 本文通过对惠州辖区公路桥涵台后病害的深入调查，对该地区普遍存在的“桥头跳车”产生原因及影响因素进行了分析研究。通过沉降计算的理论研究，提出了模拟施工进程的台背路基沉降计算理论和模型，并编写了相应的应用软件。为了提供理论计算所需参数，对惠州地区典型台背填土的压缩特性进行了试验研究。首次研制开发了“多功能沉降测定板”装置，并应用于惠州西林河大桥台背沉降观测。通过对理论计算值与实际观测值的系统分析，验证了本研究提出的路基沉降计算理论的可行性，并揭示了台背回填区路基沉降规律。 为有效防止桥涵病害发生，本文对地基处治及台背回填处治进行了研究。提出对台背回填进行刚柔过渡设计，提出了台背路基工后沉降控制标准，提出了台背回填长度确定公式；对惠州典型填料的技术性能进行了研究；为解决路桥衔接处压实和排水问题，对无砂大孔混凝土在台背回填中的应用进行了深入研究。 针对惠州地区的土质、地质情况，利用研发的软件对不同填土高度、不同地基状况的台背路基沉降进行了计算；通过对差异沉降的量化分析，结合沉降控制标准，为惠州桥涵台后沉降病害的防治提供了多种综合方案，方案囊括了各种填土高度、涵盖了惠州地区的三种典型地基状况。西林河大桥增城桥台台背采用病害防治技术推荐方案，处治效果良好，验证了室内研究结果的可行性。更多还原

【Abstract】 According to deep inquiry on distress at approaches to bridges and culverts in Huizhou Area, the paper discusses the main causes and influential factors of bump at the end of bridges .On the basis of studying the theory of settlement calculation , the paper puts forward the theory of calculating bridge approach settlement and calculating model which simulates construction procedure of bridge approach embankment . In the meantime, the matching software is developed. Besides, the experimental study is made on compression property of the typical earth fills in Huizhou Area. "Multi-function settlement plate" is first developed and applied to Xi Lin He Bridge. The analysis of numerical result and observed value proves the feasibility of the calculating theory and reveals the rule of bridge approach settlement.To prevent the occurrence of distress efficiently, the paper studies foundation treatment and the treatment of back filling .The paper puts forward the design of "rigidity-flexibility transition" for approach embankment and expounds the controlling criterion of the remaining settlement of approach embankment. To realize the design, the paper puts forward the formular to calculate the length of back filling area. The paper studies the performance specification of typical fills in Huzhou Area. To overcome the problems of compaction and drainage exit at embankment-bridge structure interface,the paper studies the application of no-fines concrete.In view of the nature of soil and geological of Huizhou Area, the software is used to calculate the settlement of approach embankment which has varies height and varies subgrade. By means of analyzing the calculating result and combined with the controlling criterion, the paper puts forward the projects so as to protect approaches to bridges and culverts from distress. The projects take varies height of approach embankment and three typical foundation conditions in Huizhou Area in consideration. The project is applied to Xi Lin He Bridge and good result is acquired. It proves the practicability of the result of laboratory study.更多还原