【作者】 侯峰；

【导师】 刘树堂；

【作者基本信息】 山东大学 ， 道路与铁道工程， 2010， 硕士

【摘要】 本文以青临高速公路建设为工程依托,由于青临高速公路所经临沂市河东区路段全部为填方路基,而该地区土质筑路资源匮乏,因此,采用河砂和风化料为路基填料。研究河砂和风化料的路用性能可以极大地丰富和发展这一领域的成果并起到指导施工、保证工程质量和加快进度的目的。本文通过室内试验,研究砂和风化料的物理及力学特性,主要测试项目包括含颗粒级配、比重、砂的含泥量、击实试验、毛细上升高度、直剪试验和三轴试验等。试验结果表明砂和风化料的路用性能很好,适合作为路基填料。在青临高速经过的临沂市河东区第20、21合同段范围内,选择长220m试验段(桩号K189+580～K189+800),以河砂和风化料为主要的路基填料,通过采用不同的填筑方式(纯砂芯路基、纯风化料路基和河砂-风化料复合路基)、压实方式、河砂和风化料的压实标准、路基排水方式和上封层材料从而最终确定合理的填砂-风化料路基的施工工艺。利用室内试验测得砂和风化料的力学参数,使用FLAC3D分别对纯砂芯路基、纯风化料路基和河砂-风化料复合路基三种填筑方式下路基的变形特性进行数值模拟,并且分析路基高度、路基填筑速率和地下水位等不同影响因数对路基沉降特性的影响,研究填砂-风化料复合路基的沉降特性及其沉降规律。计算结果表明：①路堤的最大沉降量发生在路堤中心。三种不同填筑方式下,风化料路堤的沉降量最大,河砂-风化料复合路堤的沉降量次之,砂路堤的沉降量最小。②随着路基高度的增加,三种填筑方式下地基的沉降量和工后沉降均增加；随着地下水位的降低和路基填筑速率的增加,三种填筑方式下路基的沉降和工后沉降均增加。同时,利用指数曲线、指数曲线组合函数曲线、双曲线、泊松曲线模型对试验路段的实测数据进行数据拟合分析,可知,对于三种断面下的实测数据指数曲线组合函数曲线拟合效果均最好,双曲线和泊松曲线次之,指数曲线较差。更多还原

【Abstract】 The paper was finished with the background of Qin-Lin highway construction. The Linyi city where the highway pass through were filling subgrade but the soil resources there, was scarce. There were a lot of river sand and weather material in the Linyi city, Therefore, the sand and weather material will become the best option. Therefore, study on road performance of sand and weather material could Enriched and developed the results of the field and ensured the quality and speeded up the construction.Representative of sand and weather material was chosen for particles gradation test, specific gravity test, mud content test, compaction test, capillary rise test, direct shear test and triaxial test in order to investigate the physical and mechanical properties of sand and weather material. Test results showed that sand and weather material has good road performance and were suitable for road fillings.In the regions where the highway pass through, it was chosen 220m road for test road. It was mainly used sand and weather material as filling materials, through different filling ways (pure sand, pure weather material and sand-weather material composite roadbed), compaction ways, compaction standards, drainage ways, up-sealing layer materials in order to determine the construction techniques of roadbed. During construction of test road, buried related components instrument in order to monitor the road settlement. FLAC3D software was used to investigate the deformation properties of roadbed in the three filling ways by the parameters through laboratory test. The factors of road height, filling rate and ground water level was also considered to investigate the impact on roadbed and the law of depositional deformation. It showed that the biggest settlement happened in the center of the embankment. The settlement of weather material embankment was biggest, composite embankment taken the second place and sand embankment had the least settlement. As the height of embankment increased, the settlement and settlement after of all three kind of roadbed increased. As the level of groundwater decreased and filling rate increased, the settlement and settlement after of all three kind of roadbed increased.It also used exponential curve, combined exponential curve, hyperbola and poisson curve models to fit and predict the measured data. Results showed that Combined exponential curve had the best fitting, hyperbola and poisson curve took the second place and exponential curve had the worst fitting effect.更多还原