摘要
为研究粤港澳大湾区的软土抗剪强度与含水率的关系,采用粤港澳大湾区主要九座城市的大量软土样本,以城市为统计对象,将含水率为自变量,以直接抗剪强度指标中的黏聚力与内摩擦角为因变量,按二次多项式关系拟合得到了各个城市的回归方程与拟合优度。结果显示,拟合优度为0.478~0.825,均达到中度相关以上,可见直接快剪强度指标与含水率之间有较好的二次多项式相关性。为验证拟合公式的可行性,选用了江门与中山的两个实际工程项目的数据进行验证,以实测含水率为自变量,通过拟合公式计算其内摩擦角与黏聚力,并与实测值进行对比,结果显示两者较为接近。本文以城市为统计对象,样本较充足,提出的拟合关系式在拟合优度上有较好的代表性,可为粤港澳大湾区的软土地基处理工程设计提供一定参考。
To study the relationship between shear strength and moisture content of soft soil in the Guangdong-Hong Kong-Macao Greater Bay Area,a large number of soft soil samples from nine major cities in the Guangdong-Hong Kong-Macao Greater Bay Area were used,the city was taken as the statistical object,the moisture content was taken as the independent variable,and the cohesion and internal friction angle in the direct shear strength index were used as the dependent variables,and the regression equation and goodness of fit of each city were obtained by fitting according to the quadratic polynomial relationship.The results showed that the goodness-of-fit ranged from 0.478~0.825,all of which reached a moderate correlation or above,indicating that there was a good quadratic polynomial correlation between the direct fast-shear strength index and the moisture content.To verify the feasibility of fitting the formula,the data of two actual engineering projects in Jiangmen and Zhongshan were selected for verification,and the measured moisture content was used as the independent variable,and the internal friction angle and cohesion were calculated by fitting the formula,and compared with the measured values,the results showed that the two were relatively close.In this paper,the city is taken as the statistical object,the sample is sufficient,and the proposed fitting relationship has a good representativeness in the goodness of fit,which can provide a certain reference for the design of soft soil foundation treatment engineering in the Guangdong-Hong Kong-Macao Greater Bay Area.
作者
廖广超
LIAO Guangchao(Foshan Branch of China Coal Jiangnan Construction Development Group Co.,Ltd,Foshan,Guangdong 528226)
出处
《中国煤炭地质》
2024年第9期50-54,共5页
Coal Geology of China
关键词
地基稳定性
软土
回归方程
拟合优度
抗剪强度
含水率
粤港澳大湾区
foundation stability
soft oil
regression equation
goodness of fit
shear strength
moisture content
Guangdong-Hong Kong-Macao Greater Bay Area
