加筋垫层法处理涵洞吹填土地基

结合吹填土的工程特性,介绍了涵洞吹填土地基的处理原则及流程。通过有限元计算模型的建立,对加筋垫层法处理涵洞地基的效果进行了研究,分析了不同的垫层宽度、厚度、土性参数和不同格栅层数、间距及刚度时,涵洞的土压力及位移规律,并对多层加筋时格栅的轴向拉力进行了分析。结果表明：加筋垫层法能有效地减小吹填土地基上涵洞的沉降,涵顶土压力随加筋垫层宽度的增大而减小,随垫层厚度的增加呈非线性增大,并逐渐趋于稳定;格栅层数和格栅刚度的增加对减小涵体沉降有一定的作用,但同时会使涵顶土压力增大。

Settlements and Pressures of a Culvert With Reinforced Cushion on the Dredger Fills

With the consideration of the engineering properties of the dredger fill, the procedure of the ground treatment for culverts are introduced. Finite element model is principle and established to study the pressure and settlement of culvert with the reinforced cushions treating the dredger fills. The analyses are conducted to investigate the pressure and settlement of culvert influenced by the reinforced cushion with different width, thickness, strength parameters, layers and stiffness of geogrid, in addition the distribution of geogrid axial forces are also obtained when the cushion is reinforced with 3 layers of geogrid. The results show that reinforced cushion can effectively reduce the culvert settlement, the earth pressure on the top of culvert decreases with the increase of width of reinforced cushion. While the number of reinforced layers and the thickness of reinforced cushion increase, the settlement of culvert decreases, but the earth pressure on the top of culvert increases.