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公路工程遇到的全强风化岩高边坡的情况很多。风化岩体的物理力学特性与未风化岩体物理力学性质有很大差异,特别是全强风化岩体,原岩的结构面已被风化改造,对边坡的稳定性已不起控制作用,其工程性质更接近于粗粒土,因此全强风化岩高边坡极易发生破坏。以贵州凯里~麻江高速公路鹅山冲全强风化岩高边坡为例,发现全强风化岩高边坡经常会出现从浅部到深部不同深度的破坏面,圆弧是滑动面的主要形式,并提出了可以采用浅层压力灌浆、中部锚固和下部支挡等措施,分别针对不同深度的破坏面进行加固。这一综合方案不仅有效加固了高达157 m的全强风化岩高边坡,而且防止了水土流失,保护了环境,是一种经济有效的加固方式。鹅山冲高边坡加固已完成5年,一直稳定,植被完好,从中积累的全强风化岩边坡加固模式具有非常典型的意义。
There are many cases of high strength weathering rock slopes encountered in highway engineering. The physical and mechanical properties of weathered rock mass are quite different from the physical and mechanical properties of non-weathered rock mass, especially in all-weathering rock mass. The structural surface of the original rock has been weathered and rebuilt, which has no control effect on slope stability. Its engineering properties are much closer to the coarse grained soil, so the high-intensity weathering rock slopes are prone to damage. Taking the high-slope of Goosehanchong strong all-weathering rock in Guizhou Kaili-Majiang Expressway as an example, it is found that the high-grade all-weathering rock slopes often have different depths from shallow to deep, and the arcs are sliding surfaces The main forms and proposed measures such as shallow pressure grouting, anchoring in the middle and lower support can be used to reinforce the damaged surface at different depths. This comprehensive program not only effectively strengthens the entire strong weathered rock slope up to 157 m, but also prevents water and soil loss and protects the environment. It is a cost-effective reinforcement method. Goose Hill Chong Gao slope reinforcement has been completed for 5 years, has been stable, intact vegetation, from which the accumulation of all strong weathering rock slope reinforcement mode has a very typical significance.