漳州平原砂土密实度特征及评价方法探讨

The evaluation method and density characteristics of sandy soil in zhangzhou plain

台湾海峡西岸经济区南部的漳州平原(芗城区、龙文区、龙海市),大面积分布着九龙江冲洪积、冲海积砂土层,其工程性质如何,能否作为持力层,牵涉到工程造价与安全。砂土的工程性质与砂土密实度关系密切,而密实度又与砂土的分布、厚度、颗粒组成、沉积时间长短、地下水因素影响有关,不同的评价方法,所得结果不一样;经过大量工程勘察,采用多种测试方法分析与对比,评价漳州平原砂土密实度的方法应以采用重型(63.5kg)圆锥动力触探为主,并适当参考标贯试验指标。

Zhangzhou plain,in southern region of the Taiwan straits west bank,has a large area of deluvial material and marine sediments.The mechanics and engineering properties of this sandy soil in Zhangzhou plain have a close tie with engineering costs and safety.The engineering properties of sandy soil are closely related with its density,which influenced by multiple factors,like distribution、thickness,grains、deposition time and groundwater.So,using different evaluation methods come out different results.Taking into account both of project investigation and test methods,we decide to use the heavy cone dynamic sounding tests first 、standard penetration tests second to assess the density of sandy soil in Zhangzhou plain.