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采用总应力法,讨论了增湿条件下兰州地区Q3原状黄土应力-应变曲线特征,分析了增湿过程中含水量及围压对极限强度、抗剪强度参数的影响。结果表明:兰州地区Q3原状黄土的强度受含水量变化的影响较大,在低围压时含水量对黄土强度的影响更显著。随着含水量的增大,粘聚力、内摩擦角逐渐减小;粘聚力与含水量之间呈二次多项式关系,内摩擦角与含水量之间呈线性关系。利用摩尔库伦破坏准则得出兰州地区Q3原状黄土增湿条件下极限强度与含水量、围压的计算公式。
The total stress method is used to discuss the stress-strain curve of Q3 undisturbed loess in Lanzhou region under humid conditions. The influence of moisture content and confining pressure on the ultimate strength and shear strength parameters is analyzed. The results show that the strength of Q3 intact loess in Lanzhou is greatly affected by the change of water content, and the influence of moisture content on the loess strength is more significant when the confining pressure is lower. With the increase of water content, the cohesion force and internal friction angle decrease gradually. The relationship between cohesion and water content is quadratic polynomial, and the internal friction angle is linear with the water content. The formula of ultimate strength, water content and confining pressure under Q3 undisturbed loess in Lanzhou area is obtained by using Mohr coulomb failure criterion.