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由于常规的三轴剪切试验不能反映实际工程中多种应力路径对土体力学特性的影响,以福州地区花岗岩残积砾质粘性土为研究对象,进行了常规三轴固结排水剪切试验、K_0固结排水剪切试验、K_0固结侧向卸荷试验和K_0固结侧向卸荷轴向加载试验等多种室内试验,对不同应力路径条件下土体的抗剪强度、应力应变的变化情况做出比较分析,总结了花岗岩残积土在复杂应力路径下土体的变形特性及强度特征。研究表明,在不同的土体应力路径情况下,土体所对应的强度参数及变形参数,具有明显的差异性,花岗岩残积土在不同的应力路径情况下应力应变曲线均呈现应变硬化型,在实际工程中,应综合考虑各种工况,以应对土体强度及变形的变化对工程进展的影响。
Since the conventional triaxial shear test can not reflect the effect of various stress paths on the mechanical properties of soil in practical engineering, the conventional triaxial consolidation drainage and drainage tests were conducted on the granite residual gravelly clayey soil in Fuzhou area. K0 consolidation drainage test, K0 consolidation lateral unloading test and K0 unloading axial unloading axial load test and other laboratory tests were conducted under different stress path conditions of soil shear strength, stress and strain Make a comparative analysis, summarize the deformation characteristics and strength characteristics of granite residual soil in complex stress path. The results show that under different soil stress paths, the corresponding strength parameters and deformation parameters of soil have obvious differences. The stress-strain curve of granite residual soil shows strain-hardening under different stress paths. In practical engineering, various working conditions should be considered synthetically to deal with the influence of soil strength and deformation on the progress of the project.