工程建设中淤泥质砂土剪切指标的确认研究

Study on the confirmation of shear indexes of mucky sand in engineering construction

根据标准贯入试验击数,采用地方规范经验公式、Dunham经验公式、Peck经验公式、冶金部武汉勘察公司经验关系多种方法对淤泥质砂土剪切指标进行计算,并与地方经验值、室内原状砂样剪切指标进行综合比对分析后确认了勘察报告中淤泥质砂土剪切指标的合理性。研究和实践表明在广州地区采用Dunham经验公式、地方规范经验公式计算的淤泥质砂土的内摩擦角值较为合理,与淤泥质原状砂样的等效内摩擦角基本一致。

According to the blow count of standard penetration test,the shear indexes of muddy sandy soil are calculated by using local standard empirical formula,Dunham empirical formula,Peck empirical formula and the empirical relationship from Wuhan Survey Company of the Ministry of Metallurgy.After comprehensive comparison and analysis with local empirical values and indoor shear indexes of undisturbed sand samples,the rationality of the shear indexes of muddy sandy soil in the survey report is confirmed.The study and practice show that the internal friction angle of muddy sand calculated by Dunham empirical formula and local code empirical formula in Guangzhou is more reasonable,which is basically consistent with the equivalent internal friction angle of muddy undisturbed sand samples.