梅城公路K93+946～K94+082段边坡稳定性分析与加固研究

针对广东梅城公路K93+946~K94+082段碎裂结构岩质高陡边坡,在充分研究现场工程地质条件基础上,基于离散元程序UDEC定量分析边坡开挖过程中各种工况下的应力应变趋势、可能出现的破坏模式与安全系数,获得边坡处于背斜的核部且节理裂隙发育,稳定性受岩层层面部分外倾影响较大;道路建设对山体开挖打破了原始平衡,引起坡体中部出现较大范围的剪切破坏区,整体出现类似于土坡的圆弧破坏;开挖后的边坡基本处于临界稳定状态,在一定触发因素作用下,可诱发大面积滑坡的结论。据此提出采用钢筋混凝土格构梁-锚杆(索)固脚强腰和稳固破碎岩体,加强排水系统并辅以浆砌块石护坡等措施的综合治理方案并实施,既保持了高等级公路沿线整体性,又达到边坡加固的目的。

Stability analysis and reinforcement study for the K93+946～K94+082 section of the slope of Meicheng highway

Aimed at cataclastic structure high steep rocky slope of K93 + 946 ～ K94 + 082 section of Meichen highway, the quantitative analysis of stress and strain tendency under kinds of operating mode stage, and possibly appeared destruction pattern and safety coefficient, is calculated by using UDEC discrete element method during stage excavation of side slope, in full research of the site engineering geology conditions. It can be concluded that, the slope is located in the kem of the anticline with the jointing crevasses growth, whose stability is majorly influent by extroversion of part of the rock layers; the path construction excavated to the mountain massif broke the primitive balance, causing the middle of the slope to produce wide-range shear failure area, the whole of which produces circular arc destruction similar to the soil slope; the side slope is basically at the critical steady state after excavation, and big area landslide may be induced if triggered. According to the above, it was pointed out using the reinforced concrete lattic frame beam-anchor bar (cable) to strengthen feet and waists of the slope, to firm rock mass and to strengthen the drainage system, assisted by masonry slope protection and things like such comprehensive measures to be put into effect, which maintains the integrity of first-class highway along the routes and achieves the goal of the slope protection.