粉砂土路基边坡稳定性影响因素研究

Study of Influence Factors on Silty Soil Embankment Slope Stability

基于粉砂土路基,采用有限元折减强度法研究路基边坡高度、坡度和粘聚力、内摩擦角、回弹模量、剪胀角等力学指标对路基边坡安全稳定系数的影响,给出粉砂土路基边坡稳定性分析时力学指标的推荐值以及路基边坡合理的高度和坡度。结果表明:粉砂土路基填方路基高度小于8m,坡度小于1∶1.25;挖方路基高度小于12m,坡度小于1∶0.7。采用有限元强度折减法分析粉砂土路基边坡的稳定性时,对于路基填土而言,粘聚力取值大于25kPa,内摩擦角大于25°,回弹模量宜取10 000kPa,剪胀角宜取0°;对于地基土而言,粘聚力取值大于5kPa,内摩擦角大于15°,回弹模量宜取10 000kPa,剪胀角宜取0°。

With silty soil embankment,study the effect of embankment slope height,gradient,cohesive force,internal friction angle,rebound modulus and dilative angle and other mechanics index on embankment slope safety stability coefficient by use of finite element shear strength reduction method,and give recommended value of mechanics index when analyzing embankment slope stability and reasonable height and gradient of embankment slope.The researches show that the height of silty soil embankment fill subgrade is less than 8m,the gradient less than 1∶1.25;when analyzing silty soil subgrade slope stability by use of finite element shear strength reduction method,as far as subgrade filling earth,the cohesive force is more than 25 kPa,inter frictional angle more than 15°,rebound modulus 10 000 kPa and dilative angle 0°.