【摘要】 为研究秦巴山区软弱变质岩路基填料浸水前后的变形特性,选用大型压缩仪对3种不同岩性的软弱变质岩路基填料进行浸水前后的常规压缩试验、循环荷载下的压缩试验与不同浸水荷载下的压缩试验。研究结果表明:水的浸入及循环荷载的施加加大软弱变质岩填料变形,但不同岩性的软弱变质岩填料由浸水及循环荷载引起的变形具有一定差异性;另外,随着浸水荷载的增大,软弱变质岩填料的湿化变形量增大,而总的压缩变形量却减小。通过常规压缩试验结果与循环荷载下的压缩试验结果对比分析可得:循环荷载加剧软弱变质岩路基填料的变形。因此,路基浸水与行车荷载是影响软弱变质岩路基变形不可忽视的2个重要因素。以上结论对采用软弱变质岩作为路基填料的秦巴山区公路建设具有一定的指导意义。更多还原

【Abstract】 In order to study the deformation characteristics of roadbed filling of soft metamorphic rock before and after soaking in Qinling—Bashan mountainous region,the conventional compression tests and other compression tests under cyclic loading and different soaking loadings on three different lithological roadbed fillings of soft metamorphic rocks are conducted by using large-scale compression apparatus. The research results show that both the water infiltration and the applied cyclic loading can increase the deformation of soft rock filling;and the deformation of different lithological soft metamorphic rock filling induced by water infiltration and cyclic loading is different. Moreover,the wetting deformation increases and the total compression deformation of roadbed filling decreases with the soaking load. By comparing the results of conventional compression tests with those of compression tests under cyclic loading,it is found that cyclic load increases the deformation of soft metamorphic rock roadbed filling. Therefore,the analysis indicates that the roadbed soaking and traffic loading are the two important factors affecting the deformation of soft metamorphic rock roadbed,which cannot be ignored. The above conclusions have certain guide significance for the highway construction of Qinling—Bashan mountainous region,where the soft metamorphic rock is used as roadbed filling.更多还原