胶结碎石土的折线型强度准则研究

Study on Polygonal Line Strength Criterion of Cemented Gravel Soil

针对胶结碎石土在低正应力和高正应力下的表现的差异性问题,基于摩尔-库伦强度准则,根据胶结碎石土在屈服应力前后的摩尔-库伦强度线,提出了胶结碎石土的折线型强度准则,推导了强度准则参数与单轴抗压强度和抗拉强度的关系,通过单轴压缩试验和直接拉伸试验计算了强度准则参数,并与三轴压缩试验直接获取的强度准则参数结果进行比较。结果表明,计算值与试验值误差在合理范围内,折线型强度准则对胶结碎石土具有一定的适用性。

In view of the difference between the performance of cemented gravel soil under low normal stress and high normal stress, based on the Mohr-Coulomb strength criterion, according to the Mohr-Coulomb strength line of cemented gravel soil before and after yield stress, a polygonal line strength criterion of cemented gravel soil was proposed. The relationship between strength criterion parameters and uniaxial compressive strength and uniaxial tensile strength was deduced. Uniaxial compression test and direct tensile test were carried out to calculate the strength criterion parameters and compare with the strength criterion parameters obtained by triaxial compression test. The results show that the error range between the calculated value and the experimental value is reasonable. The polygonal line strength criterion is suitable for cemented gravel soil.