对渗渠式集水廊道出水量计算中若干问题的讨论

渗渠式集水廊道是一种集取地下水的构筑物形式．结合工程实例，分析、讨论了渗透系数沿廊道长度方向变化、廊道底坡取值、廊道埋置深度、地表河水的位置等因素对这种集水廊道出水量的影响．结果表明：按区域渗透系数的平均值计算所得廊道出水量与按实际渗透系数分区计算所得廊道出水量相比，相差较大；在保证工程安全和满足下游引水条件的前提下，将集水廊道靠近地表河水布置、廊道底坡取陡于地面坡度时，可明显缩短廊道长度，节省工程量．

Discussion on Outflow Calculation in Infiltration Gallery

The infiltration gallery is widely used in the northeast and west-east areas of China to collect under-ground water. The changes of the terrain or the geological condition will affect the outflow calculation of the infiltration gallery the bigger the designed abstraction flow is, the longer the length of the infiltration gallery will be. Combined with engineering cases, the outflow effect is analyzed in the essay based on the permeability coefficient changing with the length of the gallery, the gradient and the depth of the gallery, and the location of the surface runoff. A great discrepancy in outflow calculation is also discussed by taking the average of the permeability coefficient or taking different coefficient in different areas. The methods such as lowering the location of the gallery than the surface runoff and steeping the gradient of the gallery than the ground are debated in the paper in order to reduce the length of the gallery distinctly and to save the cost of the project with safety guaranteed, as well as to satisfy the abstraction volume of the downstream section.