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从现有文献可以发现,含砾量、制样方法、相对密度和固结比等因素对饱和砂砾土动强度CRR的影响已有较多研究,但鲜有文献涉及细粒含量FC对砂砾土CRR的影响。通过一系列不排水循环三轴试验,研究了FC对细粒–砂粒–砾粒混合料CRR的影响。基于颗粒接触状态理论,将细粒–砂粒–砾粒混合料分为类粗粒土、类细粒土和中间性态土;引入“循环流动”和“循环液化”描述类粗粒土和类细粒土的循环破坏过程,提出了适用于混合料的循环破坏标准。试验结果表明:随着FC的增大,混合料的CRR呈现出先降低后增大的特征,当FC=30%时,混合料的CRR最低。通过分析发现,细粒–砂粒–砾粒混合料的CRR随骨架孔隙比e_k的增大而降低,且当FC<25%或FC>35%时,两者有较好的指数关系,说明e_k是合理地表征细粒–砂粒–砾粒混合料CRR的一个物理指标。
From the existing literature, it has been found that the influence of gravel content, sample preparation method, relative density and consolidation ratio on the CRR of saturated gravel soil has been studied more and more. However, Impact of CRR. Through a series of undrained cyclic triaxial tests, the effect of FC on the CRR of fine-grained sand-gravel mixture was studied. Based on the theory of particle contact state, the fine-gravel-gravel mixture is divided into coarse-grained soil, fine grained soil and intermediate soil. The introduction of “circulating flow” and “circulating liquefaction” Soil and fine-grained soil cyclic destruction process, put forward for the cycle of mixing damage standards. The experimental results show that the CRR of the mixture decreases first and then increases with the increase of FC. When FC = 30%, the CRR of the mixture is the lowest. It is found from the analysis that the CRR decreases with the increasing of void ratio e_k, and the exponential relationship between them is good when FC <25% or FC> 35%, indicating that e_k Is a physical indicator of the CRR characterization of fine-grained-gravel aggregates.