加筋高填方边坡稳定性影响因素分析

Analysis on Influencing Factors of Reinforced High Fill Slope Stability

由于西南山区地形复杂,该地区机场常使用高填方的方式来建设地基,其中加筋土边坡是高填方工程的一种重要形式。为研究加筋高填方边坡稳定性影响因素,对自然工况与多种雨强工况下2种坡度加筋高填方边坡进行离心模型试验,分析加筋高填方边坡的变形和稳定性特性。结果显示在天然工况与降雨工况下,加筋边坡稳定性与坡度之间都存在近似线性的负相关关系,但在降雨工况下,加筋边坡稳定性对坡度变化带来的影响更加敏感。同时利用PLAXIS与Geostudio分别对2种工况\,2种坡度加筋高填方进行稳定性数值模拟。结果表明随着坡度增加,坡体孔压分布等值线由同心圆形逐渐转换成层状,渗流中心随坡度增加存在“坡体中心位置-坡脚位置-基覆界面水平斜面交界处”移动趋势。

Due to the complex terrain of southwest mountainous area,the airport in this area often uses high fill method to construct foundation,among which reinforced soil slope is an important form of high fill engineering.In order to study the influencing factors on the stability of reinforced high fill slope,centrifugal model tests were carried out on two kinds of slope reinforced high fill slope under natural conditions and different rain intensity conditions,and the deformation and stability characteristics of reinforced high fill slope were analyzed.It is known that there is approximately linear negative correlation between reinforced slope stability and slope under natural and rainfall conditions,but the influence of reinforced slope stability on slope change is more sensitive under rainfall condition.PLAXIS and GeoStudio were used to simulate the stability of reinforced high fill under two conditions and two slopes respectively.It can be seen that with the increase of slope gradient,the distribution contour of pore pressure gradually changes from concentric circle to layered,and the vadose center has a moving trend,slope center position to slope toe to interface of horizontal and slope junction,with the increase of slope gradient.