回填方式对天然土质边坡稳定性影响分析

Analysis of backfilling way on stability of natural soil slopes

回填压坡是提高天然边坡稳定性的常用手段,回填方式对边坡稳定性的提高效果及工程费用影响较大,为研究不同回填方式对稳定性的影响,采用有限差分软件FLAC^(3D)对某一天然土质边坡水平、坡脚、坡腰、坡底4种回填压坡方案进行了模拟分析,研究了稳定系数、潜在滑裂面位置及坡顶位移等方面的变化规律。结果表明:回填可显著提高边坡稳定系数,同时将使坡顶位置产生向坡体内的变形趋势,回填土自身稳定性会影响到坡体潜在滑裂面位置的变化,同一回填体积下,采用坡脚回填的方式对于边坡稳定性的提高效果最好。研究结果对于天然土质边坡回填压坡方案设计具有一定的参考意义。

Backfilling is a common means to improve the stability of natural soil slope,and backfilling schemes have large influence on the improvement of slope stability and engineering cost. To study the influence of different backfilling schemes on stability,we analyzed stability coefficient,location of potential slip plane and slope crest displacement of four backfilling schemes（ horizontal,slope toe,midslope and slope bottom） by using finite difference software FLAC^（3D）. The results show that backfilling can improve the stability coefficient of the slope obviously,and cause a inward deformation tendency at slope crest; moreover,the self- stability of backfilling soil affect the location of potential slip plane; for same backfilling volume,the backfilling from slope toe has the best effect to improve slope stability. The results are of great significance to the design of backfilling scheme for natural soil slope.