| 兰州黄河阶地卵砾石层渗透系数测试研究 |
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| 引用本文： | 高宏刚,赵天宇,胡建芳,王朋伟.兰州黄河阶地卵砾石层渗透系数测试研究[J].水文,2018,38(1):46-52. |
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| 作者姓名： | 高宏刚 赵天宇 胡建芳 王朋伟 |
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| 作者单位： | 甘肃省交通规划勘察设计院股份有限公司; |
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| 摘 要： | 采用多孔抽水、钻孔注水和单环注水试验测得兰州黄河Ⅰ级阶地卵砾石层渗透系数分别为34.19m/d、32.68m/d和26.50m/d。颗粒分析成果表明,研究区卵砾石层孔隙体系形式为卵砾类骨架形成架空大孔隙,含量较少的中细砂小颗粒难以完全充填架空大孔隙,仅起到减少大孔隙通道的作用,其渗透系数大于中细砂但小于一般意义上不含或仅含极少量中细砂的卵砾石层。对比分析可知,基于特征粒径、不均匀系数的半经验渗透系数预测值具有很大的离散性和变异性,与实测值有较大差异,作为工程建设设计参数时应通过多种方法验证其准确性。依据水文地质测试成果,结合相关资料工程经验值及地区经验,推荐研究区降水方案设计含水层渗透系数取34.19m/d。
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| 关 键 词： | 黄河阶地 卵砾石 渗透系数 |
| 收稿时间： | 2016/12/2 0:00:00 |
Permeability Coefficient of Pebble and Gravel in Yellow River Terrace of Lanzhou |
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| GAO Honggang,ZHAO Tianyu,HU Jianfang,WANG Pengwei.Permeability Coefficient of Pebble and Gravel in Yellow River Terrace of Lanzhou[J].Hydrology,2018,38(1):46-52. |
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| Authors: | GAO Honggang ZHAO Tianyu HU Jianfang WANG Pengwei |
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| Abstract: | The permeability coefficient of pebble and gravel in the first terrace of the Yellow River in Lanzhou are 34.19m/d,32.68m/d and 26.50m/d, respectively, tested by pumping, injection in borehole and single ring water injection test. According toparticle analysis, the pebble and gravel formed skeleton of large pores, and the less fine sand are difficult to filling the much morelarge pores, which only to reduce the seepage paths. In this way, the permeability coefficient of porous medium is larger than thefine sand, but less than the pebble and gravel without or only contained very small amount of fine sand. Through the contrastiveanalysis, the predicted value of permeability coefficient by grain-size distribution appeared great discrepancy and variability, whichshould be argumented on design parameters of engineering construction. Base on hydrogeological test results, engineering practicesand regional empirical value, the permeability coefficient of pebble and gravel in the Yellow River terrace of Lanzhou wassuggested taking 34.19m/d. |
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| Keywords: | Yellow River terrace pebble and gravel permeability coefficient |
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