煤矸石路基填料震陷变形特性分析

Analysis on Subsidence Deformation Characteristics of Coal Gangue Subgrade Fill

采用动三轴试验研究了循环动荷载下煤矸石路基震陷变形特性,依据试验结果建立了围压、动荷载幅值因素下煤矸石震陷变形公式,并采用有限差分程序分析了煤矸石路基的地震响应特性。结果表明:煤矸石试样轴向累积应变的对数值与动荷载幅值成正比;煤矸石路基在随机地震荷载作用下,路肩会出现剪切带,产生滑坡现象,且随着地震荷载强度的增加而变得严重;其路面残余变形呈两边大,中间小的情形,这与车辆动荷载作用下的路面沉降规律不同,为煤矸石应用于路基工程的抗震设计提供了一定的参考。

Based on laboratory dynamic triaxial tests,the seismic subsidence deformation characteristics of coal gangue subgrade under cyclic dynamic loads are studied. The formula of coal gangue’s seismic subsidence considering the confining pressure and dynamic stress is established based on experimental result.The seismic response characteristics of coal gangue subgrade are analysed by using the finite difference program. The result shows that（ 1） the relationship between the logarithm of coal gangue’s cumulated axial strain of and amplitude of dynamic loads is linear;（ 2） the shoulder would appear shear zone and landslide under random seismic load,which would be more seriously when the strength of earthquake swells;（ 3） the residual deformation of pavement is large at outside and small at middle,which is different from subsidence deformation of pavement under dynamic load of vehicle. The result could provide a reference for seismic design of coal gangue subgrade.