强风化泥岩和泥灰岩高切坡表层的破坏与防护

重庆市广泛分布泥岩、页岩、泥灰岩等易风化地层。公路路堑切坡多采用坡率法,导致坡表的表层破坏现象比较突出,不仅给养护工作带来长期影响,而且可能威胁整体稳定。根据两巫路巫溪段高切坡表层破坏来看,高切坡表层破坏主要有风化碎落、局部掉块和局部滑塌等类型,而且切坡后短时间即发生严重的表层和局部破坏现象,若不予以有效处置,则难以一劳永逸地解决养护和长期稳定性问题。竹筋喷射混凝土、铁丝网喷射混凝土和钢纤维喷射混凝土3种处置措施,既避免了素喷混凝土封层耐久性有限的不足,且不会大幅增加投资,是解决坡表风化碎落和局部稳定问题的有效手段。

Destruction and Protection of Strong Weathered Mudstone and Marl High-Cutting Slope Surface

Easily weathered strata,such as mudstone,shale and marl widely distribute in Chongqing Municipality.Highway cutting slope used slope method,resulting in the serious surface damage phenomena,is not only to bring about long-term effects for conservation work,and could threaten the overall stability.According to Wuxi-Wushan Highway high cutting slope field work,the surface damage could be classified as surface weathering damage,local swap blocks and partial collapse.If not be effective disposal,it is difficult to resolve the conservation and long-term stability problems.Three measures,such as bamboo bars shotcrete,barbed wire shotcrete and steel fiber shotcrete are presented.These measures not only avoid the noticeable problems of limited durability for shotcrete,and it will not substantially increase investment.Theses measures are effective means to solve surface weathering damage and local stability of strong weathered mudstone and marl high-cutting slopes.