高速公路煤矸石路基包边土厚度分析

Analysis on tipping soil thickness of coal gangue subgrade under freeway

为确定煤矸石路基包边土的合理厚度,通过分析煤矸石填筑路基成型过程,建立了具有包边土的煤矸石路基简化有限元模型,分析了不同包边土厚度对煤矸石路基包边土内竖向最大压应力及竖向最大剪应力的影响规律,研究了包边土厚度对煤矸石路基中心沉降量、煤矸石路基边缘沉降量、包边土边缘沉降以及包边土差异沉降、路基最大差异沉降的影响程度。结果表明:路基高度相同时,包边土内竖向最大压应力及竖向最大剪应力随包边土厚度增加而增大,当路基高度小于5m时,内力受包边土厚度影响相对较小;包边土厚度变化对煤矸石路基中心沉降量、煤矸石路基边缘沉降量及包边土边缘沉降量影响较小,对包边土差异沉降量影响较大,随着厚度增加,差异沉降逐渐增大,但差异沉降量均在1.5 cm以内。

To determine the reasonable tipping soil thickness of coal gangue subgrade, through analyzing the process of building coal gangue subgrade, a simplified finite element model of gangue subgrade tipping soil is developed. The influence law of the different tipping soil thickness on coal gangue subgrade tipping soil vertical side within the maximum compressive stress and vertical maximum shear stress is analyzed. The influence degree of tipping soil thickness on eoal gangue subgrade center settlement, edge settlement of tipping soil and coal gangue roadbed, differential settlement of tipping soil and the subgrade maximum differential settlement is studied. The results show that： both the maximum vertical compressive stress and the maximum vertical sheer stress increase with the increasing of tipping soil thickness when the embankment height is identical; while the embankment height was less than 5 m, the influence of tipping soil thickness on internal force is relatively small; the influence of tipping soil thickness on coal gangue subgrade center settlement, edge settlement of tipping soil and coal gangue roadbed is relatively small; the influence on differential settlement of tipping soil is relatively lager, differential settlement increases with the increase of tipping soil thickness, however, all the differential settlements are less than 1.5 cm. 6 tabs, 5 figs, 10 refs.