Study On Land Identification And Reclamation Mode Of Landslide Damaged Farmland In Chongqing

This paper summarized the types of landslide damaged farmland through literature review, analysis of landslide mechanism and field survey. There are5types of landslide damaged farmland including:disintegration of farmland soil layer in trailing edge of landslide by tension and pull stress, the damage of the top soil in central part of landslide by composite stress, the damage of raw soil layer at the toe of landslide by accumulation and extrusion, the damege of raw soil layer at the toe of landslide by accumulation and extrusion, the erosive damage in front of landslide with material flowing. On this basis, the evaluation unit of landslide damaged farmland was defined. Meanwhile, the farmland damage degree and reclamation suitability were evaluated. Comparison analysis with the result of Jingzhuwuji landslide was performed. The result indicated that the selection of reclamation mode should be based on the types of landslide damaged farmland. According to the reclamation obstacles and various features of different types, the paper proposed three farmland reclamation mode of trailing edge, central part and the toe of landslide, and analyzed the corresponding key technologies of reclamation, including:subsurface drainage, cutting slope and unloading, sealing crack and ecological slope protection. Finally, the reclamation project was carried out in Shuangxin Village, Xiaba Town, Jiangjin District, Chongqing.