摘要
静力触探(CPT)可以快速判别公路土层的性质,但CPT贯入阻力与土体力学参数的关系难以通过实验得到。将土体作为满足莫尔-库仑屈服准则的材料,采用塑性力学孔扩张理论,分析出影响静力触探贯入阻力的因素为:弹性模量、泊松比、黏聚力、内摩擦角、地应力、摩擦系数、孔隙比。在有限元分析中,采用任意拉格朗日-欧拉单元(ALE),通过37次有限元计算,分析各影响因素在合理范围取值时与贯入阻力之间的定量关系,得到有实用价值的拟合公式。结果表明,锥尖阻力的影响因素从大到小依次为内摩擦角、弹性模量、泊松比、黏聚力、初始地应力、孔隙比,侧壁摩阻力的影响因素从大到小依次为:内摩擦角、摩擦系数、孔隙比、初始地应力、黏聚力、弹性模量。
Static cone penetration test(CPT) can quickly identify the properties of highway soil layer, but the relationships between CPT penetration resistances and soil mechanical parameters is difficult to be obtained through experiments. Taking the soil as the material meeting the Mohr-Coulomb yield criterion and using the pore expansion theory of plastic mechanics, the factors affecting the penetration resistance of static contact test(CPT) are find out as?follows: elastic modulus, Poisson’s ratio, cohesion, internal friction angle, in-situ stress, friction coefficient and pore ratio. Through 37 finite element calculations with Arbitrary Lagrangian-Eulerian elements(ALE), the quantitative relationship between each influencing factor and penetration resistance in a reasonable range is analyzed, and a practical fitting formula is obtained. The influence of various parameters on penetration resistance is analyzed. By the descending order of influence degree, the influencing factors of cone tip resistance are internal friction angle, elastic modulus, Poisson’s ratio, cohesion, initial in-situ stress and void ratio;and the influencing factors of sidewall friction resistance are internal friction angle, friction coefficient, void ratio, initial in-situ stress, cohesion and elastic modulus.
作者
董立山
蔡晓枘
喻勇
DONG Lishan;CAI Xiaorui;YU Yong(Shanxi Jiaoke Highway Survey and Design Institute Co.,Ltd.,Taiyuan 030032,China;School of Mechanics and Aerospace Engineering,Southwest Jiaotong University,Chengdu 611756,China)
出处
《交通科技》
2022年第5期13-17,共5页
Transportation Science & Technology
基金
山西省交通科学研究院集团创新发展项目(20-JKCF-48)
山西交通控股集团科技项目(20-JKKJ-32)资助。
关键词
岩土工程
静力触探
敏感性分析
有限元
锥尖阻力
侧壁摩阻力
geotechnical engineering
cone penetration test
sensitivity analysis
finite element method
cone tip resistance
sidewall friction
