【摘要】 为分析煤矸石中掺土作为高速公路路堤填料的可行性,通过掺土煤矸石的动三轴试验,对掺土煤矸石在循环荷载作用下的动力特性进行试验研究。研究结果表明:在煤矸石中掺入适当比例的黏土,其强度均有不同程度的提高,其中以煤矸石与土的干质量为3∶1～4∶1时效果较为明显;掺土煤矸石的动应力–应变骨干曲线可采用双曲线拟合,得出4种试验煤矸石样的等效非线性动力本构H-D模型参数。试验结果可用于分析煤矸石路堤在交通荷载作用下的稳定性及变形性状。采用掺土煤矸石作为路基填料,其力学性能完全满足高速公路的设计要求。更多还原

【Abstract】 In order to analyze the technical feasibility of coal gangue mixed with soil as fillings of road embankment,the mechanical behaviors of coal gangue samples mixed with soil were studied by the consolidated undrained triaxial dynamic tests.For coal gangue with mixed soil samples,ratios of dry weight of coal gangue to that of soil are prepared with 4∶1,3∶1,and 2∶1,respectively.The results of dynamic strength tests indicate that dynamic stress σd of gangues mixed with soil increases with the proportion of soil;and there exists an optimum ratio between 3∶1 and 4∶1.The dynamic stress-strain curves can be fitted by hyperbolic curve;the dynamic hyperbolic model and its parameters are also obtained.The maximum dynamic modulus increases with the increase of confining pressure in the relation of exponential function through regression.All of these results can be used to analyze the stability of the coal gangue embankment under traffic load and its deformation.To further verify the results of indoor tests,an in-situ experiment was performed in actual road;and its ground deflections were determined.It is found that the strength of coal gangue mixed with soil as filling can meet the requirements of road embankment.更多还原