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基于室内大三轴试验对河北某高速公路中隧道围岩黄土与碎石混合体的力学性质进行试验研究,分析了碎石含量对黄土-碎石混合体力学性质的影响,试验结果表明:在相同级别围压下,随碎石含量增加,偏应力与轴向应变关系曲线在初始阶段的斜率逐级增加,达到最大偏应力值时所对应的轴向应变在减少,土石混合体表现脆性变形特点;内摩擦角随着含石量增加而增加,而黏聚力相应减少;进而提出采用双屈服模型模拟黄土-碎石混合体力学本构关系,并给出确定模型参数的方法。
Based on the indoor large triaxial test, the mechanical properties of the loess and gravel mixture in the tunnel surrounding rock mass in a highway in Hebei Province were studied. The effect of the gravel content on the mechanical properties of the loess-gravel mixture was analyzed. The experimental results show that in the Under the same confining pressure, with the increase of gravel content, the slope of deviatoric stress versus axial strain increases gradually in the initial stage, and the axial strain corresponding to the maximum deviatoric stress decreases, and the brittle deformation of soil-rock mixture The internal friction angle increases with the increase of rock content and the cohesion decreases correspondingly. Then, the mechanical constitutive relationship between loess and gravel mixture is simulated by double yield model and the method to determine the model parameters is given.