摘要
为研究Sandwich形加筋土桥台受力和变形性能,通过FLAC^(3D)软件建立Sandwich形加筋土桥台与传统的粗颗粒土加筋土桥台的数值计算模型,研究条形荷载作用下两种加筋土桥台的竖向沉降、水平变形、水平土压力及筋材处竖向压力的变化规律。研究中将计算结果与其他文献的结果进行比较,验证数值模型的正确性。结果表明:两种形式桥台的荷载—沉降变化规律一致,但Sandwich形加筋土桥台比粗颗粒土加筋土桥台极限承载力小8%;Sandwich形加筋土桥台比粗颗粒土加筋土桥台最大水平变形大4%;两类桥台的墙后水平土压力随着上部作用荷载的增大而逐渐增大,随着高度的增加而减小。Sandwich形加筋土桥台筋材处的垂直土压力沿水平方向呈非线性分布,最大值发生在筋材中后部,粗颗粒土加筋土桥台变形以及筋材受力分布较均匀。
In order to analyze the mechanical and deformation performance of the sandwich reinforced soil abutment,the nomerical models of sandwich reinforced soil abutment and traditional coarse-grained soil reinforced abutment were established using FLAC3 D.The variation of vertical settlement,horizontal displacement,horizontal earth pressure,vertical earth pressure of the sandwich reinforced soil abutment and the coarse-grained soil reinforced abutment under different load levels were studied.The correctness of the established model was verified by comparing the results of test.The results show that the load settlement law of the two types of abutments is similar,but the ultimate bearing capacity of the sandwich reinforced soil abutment was 8% less than that of the coarse-grained soil reinforced abutment.Sandwich reinforced soil abutment was 4% larger than the maximum horizontal deformation of coarse-grained soil reinforced abutment.The horizontal earth pressure behind the wall of the two types of abutments increases with the increase of the strip load.In addition,with the increase of height of the abutment,the horizontal earth pressure of the sandwich reinforced soil abutment decreased linearly.The vertical earth pressure at the sandwich reinforced soil abutment was nonlinearly distributed along the horizontal direction,and the position of maximum vertical earth pressure was at the back of the geogrid.The deformation and the stress distribution of reinforcement materials of coarse-grained soil reinforced abutment were relatively symmetrical.
作者
章苏亚
ZHANG Suya(Shanghai Highway Bridge(Group)Co.,Ltd.,Shanghai 200433,China)
出处
《现代交通技术》
2021年第3期33-38,共6页
Modern Transportation Technology
