汤屯高速公路某反倾边坡变形破坏模式分析及支护设计

对汤屯高速公路上一典型反倾高边坡的变形破坏机理进行了系统研究。对边坡的地质条件及岩体结构特性进行了深入分析,表明该边坡将发生2种不同类型的失稳模式:小桩号侧主要以松弛和架空的碎裂-碎块的倾倒变形体为主,其变形破坏受最大剪应力面控制;大桩号侧岩体为较完整岩体,岩体质量较好,可能产生局部掉块失稳。利用极限平衡方法对小桩号侧的倾倒变形体的稳定性进行分析,并提出相应的支护措施。

Model Analysis of Deformation and Damage on Flare Slope in Tangkou-Tunxi Expressway and Its Support Design

This paper systematically studies the deformation and damage mechanism of a typical flare slope in Tangkou-Tunxi Expressway.Also it intensively analyzes the geological conditions of the slope and the structural property of the rock body.Results show this slope may have two different instability modes: The small pile number side will be mainly influenced by slack/hollow cracks-debris incline deformation,the deformation damage is controlled by max.shear stress surface;The big pile number side rock body is relatively integrated rock body with good quality,it may have partial abscission and instability.This paper analyzes the stability of inclined deformation at small pile number side with method of limit equilibrium,and suggests corresponding support measures.