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三轴试验是获取土体强度和应力变形特性的一个重要室内试验手段。三轴试验中,排水固结阶段试样的孔压消散及固结完成情况是非常重要的两个核心要素,它是进行后续剪切试验的基础和依据。基于等应变假设,推导了土体三轴剪切试验排水固结过程的解析解,以用于分析整个排水固结过程的孔压消散和固结完成程度。针对室内三轴固结排水(CD)试验,利用所推导的解析解对其排水固结过程的孔压和固结度进行了验算对比。结果表明,解析解计算得到的固结度和孔压消散曲线与室内三轴剪切试验的相应曲线吻合得较好,说明解析解可应用于三轴剪切试验排水固结过程分析。
Triaxial test is an important indoor test method for obtaining soil strength and stress-strain characteristics. In the triaxial test, the dissipation of pore pressure and the completion of consolidation are the two most important core elements in the drainage consolidation stage. It is the basis and basis for the subsequent shearing test. Based on the assumption of equal strain, the analytic solution of drainage consolidation process of soil triaxial shear test is deduced, which can be used to analyze the pore pressure dissipation and consolidation completion of the entire drainage consolidation process. Aiming at the indoor three-axis consolidation drainage (CD) test, the pore pressure and the consolidation degree of the drainage consolidation process are compared with the analytical solutions deduced. The results show that the calculated consolidation degree and pore pressure dissipation curve are in good agreement with the corresponding curves of triaxial shear tests in laboratory, indicating that the analytical solution can be applied to the analysis of drainage consolidation process in triaxial shear tests.