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紫色土丘陵山区地形起伏不平,不同的地形部位形成不同的土地利用类型,具有不同路基基础.本文针对紫色土丘陵山区冲田(冬水田)、塝田(水旱轮作田)和旱地路基基础,进行田间道路基分析及路基处理研究.冲田粘粒含量最大,达到41.35%;塝田次之,含量为22.25%;旱地最小,含量只有11.23%.冲田的塑性指数最大,达到21.47;塝田次之,为16.98;旱地最小,只有8.11.田间道过冲田段主要为填方路段,淤泥较多,力学性质差,路基处理时先挖除1m厚的淤泥,然后换填取自旱地的路基土,并分层碾压,压实度大于90%,道路两侧设计条石挡土墙;塝田段先换填0.5m厚的淤泥,同时增高路基以保证道路连续,然后碾压;旱地段只需清除表层腐殖土后铺设路面材料,不做特殊处理.
Purple terrain hilly terrain undulating, different topographic parts of the formation of different types of land use, with different subgrade foundation.This paper for the red soil hilly area Okita (winter paddy field), 塝 field (flood and drought rotation) and dry land subgrade, carried out Field roadbed analysis and subgrade treatment.The content of clay in Nuoda was the highest (41.35%), the latter was 22.25% in Nuoda, and the lowest in dry land was 11.23% .The plastic index of Okita was the highest, reaching 21.47% , The lowest was 16.98; the dry land was the smallest, only 8.11. The field passing through the section of the main section of the Tiantian section was filled with more silt and poor mechanical properties. First, 1m thick silt was dug during roadbed treatment, And stratified laminated compaction degree of more than 90%, the design of stone retaining walls on both sides of the road; Gao Tian first replaced by 0.5m thick silt, while increasing the roadbed to ensure continuity of the road, and then rolling; dry section only Need to clear the surface of humus soil pavement material, do not do special treatment.