边坡加固中倾斜微型桩抗滑机理研究

Study on the anti-sliding mechanism of inclined micro-piles in slope reinforcement

在滑坡治理工程中,倾斜微型桩群可以提高边坡稳定性,研究倾斜微型桩的受力特点可为实际工程中微型桩的设计提供参考依据。基于有限元强度折减法,分别对竖直和倾斜微型桩群支护下的边坡进行了模拟分析,探讨了微型桩倾斜角度对其受力特点的影响。结果表明:倾斜微型桩群比竖直微型桩群具有更好的支护效果;竖直微型桩群与倾斜微型桩群抗滑机制不同,前者在抵抗滑坡推力时表现为三排桩协同受力,各排微型桩受力与变形一致,而后者在支护过程中形成一个刚架结构,其中迎土侧微型桩倾斜将受到的部分水平推力通过连梁传递至背土侧微型桩,背土侧微型桩则借助倾斜角度为迎土侧微型桩提供支撑,以抑制桩体与土体的整体滑移,从而提高了边坡的稳定性。

In landslide control,use of inclined micro-pile groups can improve the slope stability,and study of the force characteristics of the inclined micro-piles can provide a reference for the design of the micro-piles in the actual projects.Based on the finite element strength reduction method,this study simulated and analyzed the slopes under the support of vertical micro-pile groups and inclined micro-pile groups,and discussed the influence of the inclination angle of the micro-piles on their stress characteristics.The results showed that the inclined micro-pile groups exhibit the superior support effectiveness compared to the vertical micro-pile groups.The anti-sliding mechanism differs between vertical micro-pile groups and inclined micro-pile groups.In the case of the vertical micro-pile groups,three rows of piles acted synergistically to resist landslide thrust,with the force of each row of micro-piles consistent with the deformation.Conversely,the inclined micro-piles groups formed a rigid frame structure in the support process.The partial horizontal thrust of the inclined micro-piles on the soil-facing side was transferred to the micro-piles on the back soil side through connecting beams.Micro-piles on the back soil side provided support for the micro-piles on the soil-facing side through the inclination angle,which inhibited the overall slide of the piles and the soil,and improved the slope stability.