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对某堆石坝覆盖层砂卵砾石料进行了不同干密度试样中型三轴试验,试验包括常规各向等压固结的三轴排水剪试验(CID试验)和各向不等压(K0)固结的三轴排水剪试验(CK0D试验),对试验结果进行对比分析,研究2种试验方法对试验结果的影响。结果表明,2种试验所得到的应力—应变关系曲线总体规律比较一致,大小略有差异,CK0D试验的剪胀性比CID试验明显;不同围压下,2种试验的偏应力峰值差异(相对峰值)平均幅值为3.9%;对应3种密度(2.17、2.22、2.40g/cm3),CK0D试验各围压下的平均内摩擦角分别比CID试验的内摩擦角大0.88°、0.48°、0.43°;随着密度增大,2种试验的强度均显著增大,且强度指标随密度近似线性增大。列出并比较了2种试验的邓肯模型参数,两者没有显著的差异。
The medium-scale triaxial tests with different dry density samples for a sand-gravel aggregate of a rockfill dam were carried out. The tests included the triaxial shear test (CID test) and the constant unequal pressure (K0 ) Consolidated three-axis drainage shear test (CK0D test), the comparative analysis of test results to study the impact of two test methods on the test results. The results show that the general laws of stress-strain curves obtained by the two kinds of tests are consistent and their sizes are slightly different. The dilatancy of CK0D test is more obvious than that of CID test. Under different confining pressure, the difference of peak deviatoric stress The average internal friction angle under confining pressure of the CK0D test is 0.88 ° and 0.48 ° greater than the internal friction angle of the CID test respectively corresponding to the three kinds of densities (2.17, 2.22 and 2.40 g / cm3) 0.43 °. With the increase of density, the strength of the two kinds of test significantly increased, and the intensity index increased linearly with the density. The Duncan’s model parameters for the two trials are listed and compared, with no significant difference between the two.