三向格栅加筋桥头路堤的试验和数值模拟分析  

Experimental and numerical studies on triaxial geogrid-reinforced embankment at bridge approach

作　　者：马强[1] 肖衡林[1] 李丽华[1] 陶高梁[1] 

机构地区：[1]湖北工业大学土木工程与建筑学院,湖北武汉430068

出　　处：《岩土工程学报》2013年第S1期287-293,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51208187);教育部重点项目(2010133);湖北省教育厅优秀中青年人才项目(Q20111409);湖北省创新群体项目(2012FFA035)

摘　　要：依托长(治)平(顺)高速公路工程,在路桥过渡段进行了新型三向格栅加筋路堤的现场试验,对格栅与桥台之间锚固连接与无连接两种工况加筋路堤中格栅上、下表面的土压力与格栅变形进行了测试,分析了新型三向格栅加筋桥头路堤填土的有效长度和作用效果。并利用数值模拟分析了格栅刚度和路堤填料参数对桥头差异沉降和格栅锚固端拉力的影响。结果表明:三向格栅加筋处理桥台搭接路堤能够在一定程度上减小格栅下部土压力和路堤沉降,其有效加固长度约为6 m;格栅与桥台锚固能够有效提高格栅拉力,减小桥台邻近路堤的沉降,而格栅与桥台无连接时,格栅抗拉能力不能有效发挥,路堤沉降不能有效控制;格栅刚度与填料黏聚力对格栅拉力和路桥差异沉降具有较大影响,在工程中应根据工程条件选择适宜刚度的格栅和具有一定黏聚力的路堤填料。Field experiment on the embankment at bridge approach reinforced by triaxial geogrid is carried out in Changzhi to Pingshun expressway.The earth pressures of the embankment fill below and above the triaxial geogrid and the deformations of the triaxial geogrid measured in cases of its attachment to or not to the abutment.The effective length and the effect of the triaxial geogrid reinforcement in the embankment of bridge approach are investigated.In addition,the differential settlements at the bridge approach of and the tensile forces of the geogrid are analyzed through numerical simulations.The results show that the earth pressures and the settlements can be reduced by the triaxial geogrid reinforcement in the embankment in a certain extent,and the effect of the triaxial geogrid reinforcement is extend to nearly 6 m from the abutment.The tensile force of the triaxial geogrid can be increased and the settlement can be reduced with the triaxial geogrid attached to the abutment.While the effect of reinforcement without attachment is not obvious.The tensile stiffness of the geogrid and the cohesion of embankment fill have great effect on the tensile force and the settlement of the embankment.Thus the geogrid with appropriate tensile stiffness the embankment fill with suitable cohesion should be employed in practice.

关 键 词：加筋路堤 沉降 桥头 现场试验 数值模拟 

分 类 号：U416.12[交通运输工程—道路与铁道工程]