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以上海某植物园一期和四期工程中填筑山体为例,研究了上海地区园林山体填土特性的变化规律。首先对施工期和工后一年填土的含水率、饱和度及压实度等物理指标进行了测试对比,结果表明上海等多雨地区的气候会使园林山体填土的物理特性发生变化;山体填筑完工后,山体表层填土的含水率和饱和度有较明显的增大,填土的压实度在浅表层有所下降,下部略有增大。然后对工后一年的填筑山体现场钻孔取样,在天然含水率下进行直接快剪试验,分析填土抗剪强度与含水率的关系,得出含水率的增大使填土抗剪强度降低;含水率主要通过填土粘聚力对抗剪强度产生影响,对内摩擦角影响不大。
Taking a mountainous area in the first and fourth phases of a botanical garden in Shanghai as an example, the changing regularity of the filling characteristics of garden lands in Shanghai was studied. First of all, physical indexes such as moisture content, saturation and compaction of filling soil during construction and one year after the end of the year are tested and compared. The results show that the climate in rainy areas such as Shanghai will change the physical characteristics of the mountainous landfills. After the completion of filling, the moisture content and saturation of the mountain surface soil filling have obviously increased, the compaction degree of the filling soil decreased slightly in the shallow surface and the lower part slightly increased. Then, after one year’s post-construction, a sample of mountain borehole was sampled and directly sheared at natural moisture content. The relationship between shear strength and water content was analyzed. It was found that the increase of moisture content makes the shear strength Decrease; moisture content mainly through the fill cohesion of shear strength impact, little effect on the internal friction angle.