论文部分内容阅读
运用plaxis有限元软件分析地震作用下桩-网复合地基的路堤破裂面,揭示了地震荷载作用下复合地基路堤产生路面拉裂破坏,桩-网复合地基的破裂面发生在路堤两边缘的现象,表明土工格栅加筋可起到裂缝隔断作用和变形控制作用,路面张拉裂缝由于长筋的存在而不能向下继续扩展,坡面土体的侧向变形由于短筋的存在受到抑制,进而防止了路堤坡面滑塌。同时利用有限元强度折减法对桩一网复合地基的路堤加筋方式进行优化设计,得出不同加筋情况下的安全系数。研究表明,常规加筋设计时,动力安全系数为1.55,顶部增设通长筋时,动力安全系数为1.78,在中部再增设8 m短筋时,动力安全系数提高至2.35,比常规加筋情况下提高了51.6%。
The plaxis finite element software is used to analyze the embankment rupture surface of the pile-net composite foundation under earthquake action. The phenomenon that the composite foundation embankment cracks and cracks under the action of earthquake load and the rupture surface of pile-net composite foundation occurs on both edges of the embankment is revealed. It shows that geogrid reinforcement can play the role of fracture partition and deformation control. Because of the existence of long ribs, the tensile cracks of pavement can not continue to expand downward. The lateral deformation of slope soil is restrained by the existence of short ribs, Prevent the landslide on the slope of embankment. At the same time, the finite element strength reduction method is used to optimize the embankment reinforcement method of pile-net composite foundation, and the safety factor under different reinforcement conditions is obtained. The results show that the dynamic safety factor is 1.55 when the conventional reinforcement design is adopted and the dynamic safety factor is 1.78 when the long reinforcement is added to the top. When the additional 8 m short reinforcement is added to the middle, the dynamic safety factor is increased to 2.35. Compared with the conventional reinforcement Under the increase of 51.6%.