软土路堤中土工格栅在填筑与地震作用下的受力特性

土工格栅在软土路基中已有广泛应用,与塑料排水板的配合使用可以加速软土路基的固结沉降。首先对软土路堤进行了静力加载填筑计算分析,分析加筋垫层土工格栅的受力特性和位移变形特性;其次对建成的软土路堤选择与场地类型相适应的地震波进行了地震动力响应分析,获得了土工格栅的受力特性及变形特性。结果表明,不等高反压平台的修建导致了后续土工格栅受力不均;但轴力值在容许值之内,地震响应下路堤主要以水平运动为主,土工格栅的运动及受力趋势可以为路堤整体性提供评价依据。

Filling and Seismic Mechanical Response of Geogrid in Soft Soil Embankment

Geogrids are widely used in soft soil embankment, especially cooperated with prefabricated vertical drain. Consolidation settlement acceleration can be achieved in soft soil embankment treated by geogrids and drainers. This paper aims to static load calculation and analysis of filling in soft soil embankment. The deformation and mechanical characteristics of geogrids in reinforcement layer were analyzed. Then seismic analysis of the soft soil embankment model stimulated by earthquake wave matched with the site of project was conducted. The deformation and mechanical characteristics of geogrids were obtained. The results implied that the force of geogrid was uneven because of the erection of unequal height berm, but the axial force values are under the allowed value. Horizontal movement was the mean trend stimulated by seismic wave, the movement and the forcing distribution of geogrids can be used as a reference for the evaluation of the overall embankment.