风化料包边填砂路堤边坡稳定性分析

Analysis of Stability of Sand-filled Embankment Slope Covered with Weathered Rock Material

为研究风化料包边河砂填筑路堤的边坡稳定性,基于强度折减法计算分析了填料压实度、含水率、路堤高度、边坡坡度及风化料包边宽度等诸多因素对边坡安全系数的影响规律。结果表明,路堤高度确定时,随着边坡坡度的增大,路堤的边坡稳定性显著下降;随着砂含水率的减小,安全系数呈增大趋势。在文中涉及的工程条件下,风化料包边宽度不对安全系数起决定性作用,其宽度可依据施工压实要求和料源的丰足程度确定。方差分析表明,边坡坡度、风化料包边宽度及填料含水率3个因素对边坡稳定性影响的程度依次为:边坡坡度>含水率>风化料包边宽度。

To study the slope stability of river sand embankment covered with weathered rock material, based on strength reduction method, the effect of many factors including compaction degree of filler, water content, height of embankment, slope gradient and thickness of weathered rock material cover layer on the embankment slope safety coefficient is analyzed. The results indicate that （ 1 ） when the embankment height is determined, the slope stability of embankment significantly decreases with the increase of slope gradient; （2） the safety coefficient increases with the decrease of water content of sand. The thickness of weathered material cover layer does not play a decisive role on the safety coefficient under the engineering condition involved in the paper, and the thickness can be determined according to the requirement of compaction and fullness of material sources. The result of variance analysis shows that the sequence of three influencing factors in terms of the influencing degree on the slope stability is slope gradient 〉 water content of filler 〉 thickness of weathered material cover layer.