潜南滑坡成因机制及其水泥土键治理

潜南滑坡位于江淮切岭段,属浅层牵引式滑坡。滑坡的主要原因是切岭边坡应力状态的改变、土体的超固结性、胀缩性以及干湿循环造成渠坡土体裂隙发育,雨水入侵促使土体膨胀、软化、强度下降。在对滑坡规模、滑坡区岩土工程地质特征等影响因素分析的基础上,采用水泥土键作为支挡结构,结合地表截、排水沟、坡内导渗盲沟、草皮护坡等措施进行综合治理。水泥土键作为支挡结构,施工方便,可就地取材,降低工程造价。对于砂石料缺乏或运输较困难的区域,优势明显。

Genetic mechanism of Qiannan landslide and its treatment with soil-cement key

Qiannan landslide,a retrogressive landslide,locates at Jiang-Huai Cutting-Ridge;of which the main causation is the development of the fissures on channel slope caused by the change of the stress state of the slope, over-consolidation,swell-shrink and wetting-drying cycle of the soil body as well as the soil expanding,softening and strength decrease due to the rain water invasion.Based on the analysis on the effects of the scale of the landslide and the geotechnical features of the landslide region,a comprehensive treatment measure consisting of taking the soil-cement keys as the supporting structure along with placing relevant surface cut-offs and drain ditches and the blind drains inside of the slope for seepage guiding and the grassed slope etc.is adopted therein.As the supporting structure,the soil-cement key has the significant advantages of convenient construction with local material and lower construction cost,therefore,the method is suitable for the regions lack of sand and rock materials or difficult to transport them.