CAJ | 학술논문

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K0固结及各向等压固结条件下的排水剪切试验，探讨了K 0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K 0固结粗粒土的适用性。结果表明：粗粒土在K0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DP与相对密度Dr、围压s3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K 0固结粗粒土，修正Rowe剪胀方程能较好地描述其剪胀性。
채용대형삼축전절의대불동상대밀도적쌍강구심장패복개층료，진행료K0고결급각향등압고결조건하적배수전절시험，탐토료K 0고결급각향등압고결조건하조립토전창성적차이，병검험료수정Rowe전창방정대K 0고결조립토적괄용성。결과표명：조립토재K0고결조건하，교각향등압고결조건하적전창성명현，차저충차이성재밀도교소적조립료중체현교위돌출，이수착밀도적증가，차이성축점감약；대시험수거진행비선성의합，총결출전창인자DP여상대밀도Dr、위압s3지간적관계식，거차가분석불동긴밀정도조립료전창성적강약；대K 0고결조립토，수정Rowe전창방정능교호지묘술기전창성。
Using large-scale shearing device, 0K consolidation-drained triaxial test and isotropic consolidation-drained triaxial test under different confining pressures are performed for three relative densities (0.9, 0.8, 0.7) overburden material of ShuangJiangKou earth dam. The difference between dilatancy behaviours of coarse-grained soil under 0K -consolidation and isotropic consolidation is investigated. Meanwhile, applicability of the modified Rowe dilatancy equation for coarse-grained soils under 0K -consolidation is tested. The test results show that the dilatancy under 0K -consolidation is more remarkable than that under isotropic consolidation;and this difference is more obvious for coarse-grained soils with lower density. By means of the nonlinear fitting of the results of triaxial tests, a relationship formula for coarse-grained soils under 0K -consolidation and isotropic consolidation among dilatancy factor and relative density and confining pressure is obtained, according to which, the dilatancy’ strength of coarse-grained soil under different consolidations can be judged. For the coarse-grained materials under 0K -consolidation, of which dilatancy characteristics can be reflected well by the modified Rowe dilatancy equation.