螺旋钢桩加固土质边坡稳定性分析

为研究螺旋钢桩快速加固土质边坡效果,首先验证有限元软件PLAXIS运用强度折减法计算土质边坡稳定系数的可靠性,其次采用正交试验设计方法,选取螺旋钢桩加固位置、桩长以及螺旋叶片直径3个因素对加固效果进行参数敏感性分析,每个因素下选3个水平,并以边坡稳定系数和失稳滑动范围作为加固后土质边坡的评价指标。基于有限元强度折减法分别对9组正交试验对算例中的土质边坡分析。结果表明,加固后边坡稳定系数均有提高;螺旋钢桩在边坡中的桩长为边坡加固中应首要考虑的因素,在一定范围内,桩长越大边坡稳定系数也增大,边坡失稳滑动的范围将减小;加固位置影响次之,叶片直径影响最小。

Stability Analysis of Soil Slope Reinforced with Screw Piles

In order to study the practical effect of the soil slope fast reinforced by screw piles,the reliability of finite element software PLAXIS in calculating soil slope stability coefficient by strength reduction method is verified first,then,the orthogonal test method is adapted to analyze parameter sensitivity of reinforcement effect,taking three factors into consideration:the location of screw piles,the length of piles and the diameter of helix.Each factor is designated with three different levels,and the stability coefficient of the slope and the instability slide range are regarded as evaluation indicators of the reinforced soil slope.Nine groups of orthogonal tests are conducted to analyze the stability of the soil slope in question based on finite element strength reduction method.The results show that the stability coefficient of the slope is improved after reinforcement,and the length of the screw piles embedded in slope is the primary consideration in slope reinforcement;and the longer the pile,the larger the stability coefficient of slope and the smaller the range of instability slide will be;the second consideration is the location of the reinforcement,and the factor of diameter of helix has the least effect on reinforcement.