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我国工程土颗粒大小分析试验的比重计法过去一般采用苏联А·М·瓦西里也夫(Васильев)加氨煮沸方法。在土中遇有易、中溶盐时,必须淋洗后悬液才能保持稳定;黄土、类黄土、红土、膨胀土等含有大量高价阳离子、难溶盐或倍半氧化物时,仍然发生凝聚,致使试验不能完成。我国解放后一直应用这一方法,迄今已有30年了。为了解决这一问题,我国许多单位改用了六偏磷酸钠,这一改变影响了土的分散标准、用粒组成分定名及与其他物理力学性质对比的关系,涉及的面很广;研究这一问题也是重新认识过
The hydrometer method of the engineering soil particle size analysis test in China used the Soviet Union А. М. Vasilyev (Васильев) plus ammonia boiling method. In the case of easy and medium soluble salts in the soil, the post-suspension must be rinsed to maintain stability; loess, loess, red soil, expansive soil, etc. still contain a large amount of high-valent cations, insoluble salts, or sesquioxide. , so that the test could not be completed. This method has been applied after China’s liberation and has been for 30 years. In order to solve this problem, many units in China have switched to sodium hexametaphosphate. This change has affected the decentralized standards of soil, the use of granular composition and the comparison with other physical and mechanical properties, and the scope involved is very broad; One problem is to re-understand