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绢云母片岩粗粒料大量用于谷城—竹溪高速公路路基填筑,为研究不同应力路径下绢云母片岩粗粒料的力学特性,采用大型三轴试验机,对绢云母片岩粗粒料分别进行常围压下的固结排水、固结不排水三轴试验以及等p应力路径下的固结排水试验。研究表明,低围压条件下,应力–应变曲线均表现为应变硬化型,但是在高围压条件下,却出现了应变微软化现象。在整个试验过程中,体积应变均以剪缩为主,并没有出现低围压剪胀的现象;并通过分析该粗粒料的破碎特征阐述了出现这种反常现象的原因。另外,通过对不同应力路径下的绢云母片岩粗粒料进行强度分析,验证了Duncan非线性强度准则对绢云母片岩粗粒料具有良好的适用性。
In order to study the mechanical properties of sericite schist coarse aggregates under different stress paths, a large number of sericite schist coarse aggregates are used in the filling of Gucheng-Zhuxi expressway. Large-scale triaxial test machines are used to study the effects of sericite schist coarse aggregates Respectively, under constant pressure around the consolidation drained, consolidated undrained triaxial test and consolidation p drainage path under the stress-displacement test. The results show that the stress-strain curves show strain hardening under low confining pressure, but strain softening occurs under high confining pressure. During the whole experiment, the volumetric strain was dominated by shearing and shrinking, and the phenomenon of low confining pressure dilatancy was not observed. The reason of this anomalous phenomenon was explained by analyzing the crushing characteristics of the coarse aggregate. In addition, through the strength analysis of sericite schist aggregates under different stress paths, it is verified that Duncan nonlinear strength criterion has good applicability to sericite schist coarse aggregates.