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采用大型三轴剪切仪对不同相对密度的双江口心墙坝覆盖层料,进行了0K固结及各向等压固结条件下的排水剪切试验,探讨了0K固结及各向等压固结条件下粗粒土剪胀性的差异,并检验了修正Rowe剪胀方程对0K固结粗粒土的适用性。结果表明:粗粒土在0K固结条件下,较各向等压固结条件下的剪胀性明显,且这种差异性在密度较小的粗粒料中体现较为突出,而随着密度的增加,差异性逐渐减弱;对试验数据进行非线性拟合,总结出剪胀因子P D与相对密度r D、围压3?之间的关系式,据此可分析不同紧密程度粗粒料剪胀性的强弱;对0K固结粗粒土,修正Rowe剪胀方程能较好地描述其剪胀性。
A large triaxial shear instrument was used to test the drainage shear of Shuangjiangkou core wall dam with different relative densities under 0K consolidation and isocline consolidation conditions. The difference of dilatancy of coarse grained soil under pressure consolidation condition and the applicability of modified Rowe dilatancy equation to 0K consolidated coarse grained soil are tested. The results show that the dilatancy of coarse grained soil under consolidation condition of 0K is more obvious than that under the condition of uniform isotropic consolidation, and this difference is more prominent in the denser coarse aggregate. With the density , And the difference is gradually weakened. By fitting the experimental data nonlinearly, the relationship between dilatancy factor PD and relative density r D and confining pressure 3? On the 0K consolidation coarse grained soil, the modified Rowe dilatancy equation can describe its dilatancy better.