Research on the correlation between PMT and SPT in loess silty clay
FAN Jiawei1，ZHANG Yufang2，YUAN Kun2，ZHOU Wenjiao2
(1. China Academy of Railway Sciences，Beijing 100081，China；2. Railway Engineering Research Institute，
China Academy of Railway Sciences Co.，Ltd.，Beijing 100081，China)
Abstract：Pressuremeter test and standard penetration test are two common in-situ test methods. Pressuremeter modulus，limit pressure，and standard penetration blows are the parameters to describe the mechanical properties of soil. The standard penetration test is a simpler and more cost-effective method. Pressuremeter test can obtain multiple mechanical parameters of soil，but the operation is complicated and expensive. This paper aims to reveal the characteristics of the loess silty clay pressuremeter modulus，limit pressure，and standard penetration blows with the change of natural moisture content of soil，and then to explore the experience expressions of pressuremeter modulus and limit pressure regarding to standard penetration blows. For this purpose，a railroad loess subgrade in Zhengzhou，Henan region was selected. 47 sets of pressuremeter tests and standard penetration tests were carried out. The empirical relationship among pressuremeter modulus，limit pressure，standard penetration blows，and natural moisture content of the soil was obtained by regression analysis. Hypothesis testing was carried out based on statistical analysis methods to verify the validity of the empirical relationship. The research results show that：with the increase of natural moisture content，the standard penetration blows，pressuremeter modulus，and limit pressure of loess silty clay in Zhengzhou area decrease linearly，respectively. When the natural moisture content increases to the plastic limit，the linear reduction rate of the standard penetration blows，pressuremeter modulus，and limit pressure all increase，respectively. A linear relationship between the pressuremeter modulus and the standard penetration blows is existed，and a linear relationship between the limit pressure and the standard penetration blows is existed. The hypothesis testing method F-test verifies the validity of empirical expressions for pressuremeter modulus and limit pressure. Compared with previous scholars' research，the empirical expressions obtained in this experiment has a higher coefficient of determination. The empirical expression fitting analysis method of the correlation between PMT and SPT used in this experiment is more applicable in loess silty clay. The research results provide a reference for the accurate and efficient acquisition of loess mechanical parameters in the survey and design of Zhengzhou loess area.
范家玮1，张玉芳2，袁 坤2，周文皎2. 黄土状粉质黏土PMT与SPT相关性研究[J]. 岩石力学与工程学报, 2023, 42(S1): 3823-3831.
FAN Jiawei1，ZHANG Yufang2，YUAN Kun2，ZHOU Wenjiao2. Research on the correlation between PMT and SPT in loess silty clay. , 2023, 42(S1): 3823-3831.
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2023, Vol. 42 
