奥林匹克水上公园填方工程的试验研究

Experimental Study of Reclamation Project of Olympic Rowing-cannoeing Park

奥运水上公园工程中，静水赛道开挖出大量的砂质粉土和粉细砂，而又必须将这些工程特性极差的土料用于动水赛道的填筑。本文通过室内试验研究了以不同掺量的水泥、粉煤灰作为加固剂，养护不同龄期后砂质粉土的物理力学特性；通过现场足尺试验研究了水泥加固土填方和加筋挡土墙的性能；通过试验选择了合理的施工方式，为大面积正式施工做准备。结果表明：水泥加固后，砂质粉土的强度明显提高，其中粘聚力提高尤为明显；搅拌机拌和的均匀性要高于圆盘耙拌和；正常工作状态下，挡土墙中土工格栅的拉力大小只相当于其极限抗拉强度的2．1～15．9％，采用土工格栅加筋挡土墙具有较高的安全系数。

In the project of Olympic Rowing-cannoeing Park, the excavation of the static water area produces pie the nty of sandy silt and fine sand, which are bad in engineering properties and have to be used for construction of dynamic water area. In this paper, mechanical properties of the sandy silt and fine sand mixed with cement and fly ashes in different amounts after different ages curing are researched through laboratory tests ; the capability of the embankment filled with cementing sandy silt and geogrid reinforced retaining wall is researched through the in-situ full-scale tests; the reasonable construction manner is chosen, which is prepared for formal large-area construction. The results indicate that the strength of sandy silt is obviously improved after cementing, and the cohesion is improved more obviously. The homogeneity of the soil mixed by mixer is better than mixed by disc harrow. In normal state, the stress of the geogrid equals from 2.1 to 15.9 percent of the ultimate tensile strength of geogrid, and the safety coefficient of the reinforced retaining wall is quite high.