CAJ | 학술논문

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。
견운모편암조립료대량용우곡성-죽계고속공로로기전축，위연구불동응력로경하견운모편암조립료적역학특성，채용대형삼축시험궤，대견운모편암조립료분별진행상위압하적고결배수、고결불배수삼축시험이급등p 응력로경하적고결배수시험。연구표명，저위압조건하，응력-응변곡선균표현위응변경화형，단시재고위압조건하，각출현료응변미연화현상。재정개시험과정중，체적응변균이전축위주，병몰유출현저위압전창적현상；병통과분석해조립료적파쇄특정천술료출현저충반상현상적원인。령외，통과대불동응력로경하적견운모편암조립료진행강도분석，험증료Duncan비선성강도준칙대견운모편암조립료구유량호적괄용성。
Coarse aggregates of sericite schist are widely used in the construction of Gucheng-Zhuxi expressway as subgrade fillings. In order to study the mechanical properties of coarse aggregates of sericite schist,a series of large-scale triaxial tests under different stress paths were carried out,including the conventional drained triaxial, conventional undrained triaxial and constant p tests. All of the stress-strain curves under the low confining pressures exhibited the strain hardening phenomenon. However,the stress-strain curves exhibited the weak strain softening behavior under the high confining pressures. The volumetric strains were found to be mainly shear contraction under different confining pressures,and no shear dilatancy behavior appeared under low confining pressure. The reason of the abnormal strain change behaviour was explained through the analysis of the breakage characteristics of particles. In addition,it is verified that the Duncan′s nonlinear strength criterion has a good applicability for the sericite schist coarse aggregates .