林乃山
    （浙江省工程勘察院，宁波315012）

[摘要] 根据宁波市轨道交通1号线一期工程11个注水试验、13个单孔抽水试验及3组多孔抽水试验的实测数据，借助已有计算公式，求取宁波地区层③砂土（粉土）的渗透系数，并与室内渗透试验数值对比分析。认为采用野外现场水文地质试验综合求取的地基土渗透系数比室内渗透试验所得结果更客观、更能反应场地地基土特性。
[关键词] 砂土（粉土）；注水试验；抽水试验；渗透系数

    Calculation of the permeability coefficient for ③ layer sand (silt) of Ningbo area
    Lin Naishan
    (Zhejiang Province Engineering Survey Institute, Ningb0 3 15012, China)

Abstract: The permeability coefficient for ③ layer sand (silt) of Ningbo area was calculated on the basis of eleven injection tests, thirteen pumping tests and three groups of porous pumping tests measured data of the Ningbo Urban Rail Transit Line l phase, and then compared with the indoor penetration test values. It shows that the permeability coefficient from the field hydrogeological testing is more accurate than the result of indoor penetration test and more responsive to site characteristics of foundation soil.
Keywords: sand (silt); injection test; pumping test; permeability coefficient