合肥风化土的强度与割线模量

STRENGTH AND SECANT MODULUS OF WEATHERED SOIL AT HEFEI CITY

本文以合肥红色粘土及含泥砂土进行的单轴压缩试验,得出抗压强度及抗剪强度指标,同时得出这类土的应力应变曲线的两种形态及试样破坏的两种形态。含泥砂土样的破坏形态及强度取决于砂土及夹杂于其中的粘土的性质及分布形态。风化土的应力应变关系基本上符合双曲线模式,并据此推导出风化土的割线模量的表达式。

Based on the uniaxial compression test of red clay and muddy sand at Hefei city, this paper obtains the indexes of compression strength and shearing strength. At the same time, it obtains the two modes of the stress-strain curves and the two modes of sample failure of these soils. The failure mode and strength of muddy sand sample depend on the properties and distribution mode of the sand and the contained clay. The stress-strain relation of weathered soil essentially conforms the hyperbola mode. Thence, it derives the expression of the secant modulus of the weathered soil.