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西安市北郊排水工程,地处渭河漫滩地带,地基地质属流沙软基,水下饱和,承载能力低,施工开挖易产生液化。水上部分,承载力提高,边坡稳定,成为沙壤土层。根据实测资料,土层为淤积质粉细沙,空隙率42.4%,持水率29.5%,渗水系数 K=4.46～431.2米/日,摩擦系数0.25～0.35,饱和土承载力8～10吨/米~2。北排工程指挥部的技术人员,大胆采用拱结构,从实践中探索出在流沙软基上设计拱结构成功经验,并取得一些成果。现择要论述,以供探讨。
The northern suburbs of Xi’an drainage project, is located in the floodplain Weihe area, the foundation of the soft sediment is soft sand, saturated underwater, carrying capacity is low, prone to liquefaction during excavation. Water part of the bearing capacity increased slope stability, a sandy loam soil. According to the measured data, the soil layer is sediment silt, the porosity is 42.4%, the water holding rate is 29.5%, the seepage coefficient K is 4.46 ~ 431.2m / day, the friction coefficient is 0.25 ~ 0.35, the saturated soil bearing capacity is 8 ~ 10t / M ~ 2. The technicians of the North Ramp Command headquarters boldly adopted the arch structure to explore the successful experience of designing the arch structure on the soft sand foundation and to achieve some results. Now to be discussed for discussion.