【作者】 张欣；

【导师】 李小青；

【作者基本信息】 华中科技大学 ， 岩土工程， 2005， 硕士

【摘要】 路堤是道路工程路基的主要结构形式之一,其施工过程和竣工后的质量对于整个道路的使用质量、行车安全、修建和运营经济性等,都起着至关重要的作用。高填方路堤相对一般路堤而言,具有沉降量大,最终沉降时间长,对地基承载力要求高等特点,其研究具有重要的现实意义。本文结合空军汉口新机场118 进场道路工程实际情况,采用理论分析和数值分析相结合的手段,对软基处理、填方路堤填筑过程以及路堤在特殊荷载作用下的稳定性进行分析。首先,通过室内试验研究和现场观测数据,建立了高填方路堤的有限元分析模型,运用大型有限元分析软件ANSYS 进行计算,预测路堤的沉降变形,通过分析、比较,推荐合理的地基处理方案; 然后,对不同的压实度、填筑厚度进行研究,以确定最优的高填方路堤快速填筑施工工艺,采用动力有限元法分析利用冲压法处理路堤对减少不均匀沉降的作用; 另外,路堤填筑完成后马上要作为梁的预制场地,分析评估预制场地是否达到预制品施工和行车的要求; 最后,对含有复杂地质条件的特殊路段进行分析,用有限元强度折减法分析边坡的稳定性,并验证处理方案是否满足要求。通过有限元分析,使地基处理方案及路堤填筑方案得到优化,预制场地达到生产要求,保证了工程安全、高效地完成,为工程单位节省时间,并产生良好的经济和社会效益。更多还原

【Abstract】 Embankment is main structure format of road engineering roadbed. The process of construction and quality of completion are of critical importance for service quality、traffic safety、maintenance、operation economic of entire road. Compared with other kinds of roadbed, high fill embankment has the characteristic of larger settlement、longer ultimate settlement time, and it requires higher ground carrying capacity. So the research has important practical significance. On ground of 118 entrance road project of Hankou Air Force new airport, this thesis employees a method of combined theoretical and numerical analysis, analysis the process of soft base、procedure of fill roadbed、stability of embankment under special load. Firstly, by indoor experiment and field observation data, a finite element analysis model of high fill embankment is built. Making use of a great finite element analysis software ANSYS, settlement deformation of roadbed can be predicted. Through analysis and comparison, reasonable base process scheme can be recommended. Then research various kind of degree of compaction and fill thickness, find best construction technique of high fill embankment. By dynamic finite element method analysis to what extent using tamping method to process embankment can reduce non-uniform settlement. Furthermore, once embankment is filled, it will immediately be a place for pre-cast beams, then analysis will be made to evaluate whether this site satisfy the demand of pre-cast construction and vehicle passage. Finally, analysis special road with complicated geology condition and stability of slope by strength reduction FEM, testify whether this process method meet need. Through finite element analysis, foundation treatment and embankment fill scheme can be optimized, pre-cast site satisfy the demand of production, And it insure project can be safely、efficiently finished, save much time for construction units, and create favorable economic and social effect.更多还原