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采用大型三轴压缩试验对各级围压下南宁地区两种常见的不同密实度圆砾土的抗剪强度、变形特性、内摩擦角等进行了分析比较,试验结果表明在中密状态下圆砾土表现出明显的应变硬化和剪缩特性,而在密实状态下圆砾土则表现出应变软化及剪胀特性,抗剪强度包络线由于圆砾土本身的颗粒形状特性以及围压的增大导致剪胀作用减弱呈近似的线性,随着密实度的增大,圆砾土的抗剪强度增大,内摩擦角增大,试验值相较南宁地区以往所取的经验值而言有较为明显的提高,有效地减小了实际工程中围护结构的受力及变形,为南宁地区工程设计的参数优化起到了一定的指导作用。
The large-scale triaxial compression test was used to analyze and compare the shear strength, deformation characteristics and internal friction angle of two kinds of common densified round gravel soil under various confining pressures in Nanning. The results show that under the condition of medium density The gravel soil shows obvious strain hardening and shear-shrinkage characteristics, while in the compact state, the gravel soil shows strain softening and dilatancy characteristics. The shear strength envelope due to the particle shape characteristics of the round gravel soil and the confining pressure As the density increases, the shearing strength of the rounded gravel soil increases and the internal friction angle increases. Compared with the previous empirical values of Nanning area, the experimental values Which has obviously improved and effectively reduced the stress and deformation of the envelope in the actual project, which played a guiding role in the parameter optimization of engineering design in Nanning.