| 降雨作用下排水钉的性能及其对渗流场的影响 |
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| 引用本文： | 刘恒,余帅会,龚申,聂如松.降雨作用下排水钉的性能及其对渗流场的影响[J].福建工程学院学报,2022,0(4):327-331. |
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| 作者姓名： | 刘恒 余帅会 龚申 聂如松 |
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| 作者单位： | 中土集团福州勘察设计研究院有限公司 |
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| 摘 要： | 为探究降雨入渗作用下排水钉的排水性能及其对土体渗流场的影响，通过开展室内试验、建立排水钉数值模型、定义流量函数模拟降雨入渗过程，分析排水钉排水量及土体中体积含水率和孔隙水压力的变化规律。 结果表明:随着降雨时间的增加，排水钉排水量不断增大直至最大值，排水量处于最大值一段时间后，土体表面积水入渗完成，排水量开始大幅减小。 随着降雨入渗的发展，各监测点处体积含水率均达到土体饱和体积含水率，各处孔隙水压力值由负变正，降雨停止后，由于排水钉的排水作用，各处体积含水率均不断减小，最终，各监测点处体积含水率均小于初始状态，孔隙水压力值由正变负。 数值模拟结果能与室内试验结果具有良好的一致性。 研究结果说明排水钉具有良好的排水效果，可有效解决工程中降水的排出问题，能够为工程的排水设计提供借鉴。
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| 关 键 词： | 降雨入渗 排水钉 排水量 体积含水率 孔隙水压力 |
Performance of drainage nail under rainfall and its influence on seepage fields |
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| LIU Heng,YU Shuaihui,GONG Shen,NIE Rusong.Performance of drainage nail under rainfall and its influence on seepage fields[J].Journal of Fujian University of Technology,2022,0(4):327-331. |
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| Authors: | LIU Heng YU Shuaihui GONG Shen NIE Rusong |
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| Affiliation: | CCECC Fuzhou Survey & Design Institue Co., Ltd., |
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| Abstract: | In order to investigate the drainage performance of the drainage nail and its influence on the soil seepage field, laboratory tests were conducted so as to establish the numerical model of the drainage nail, and define the flow function to simulate the drainage infiltration process, and the drainage water volume and the changes of volumetric water content and pore water pressure in the soil were analyzed. Results show that the drainage water volume of the drainage nail increases to a maximum value as the rainfall time increases, then the drainage water volume keeps at its peak for a period of time; the drainage water volume decreases rapidly after a while owing to the completion of water infiltration on the soil surface. With the development of rainfall infiltration, the volumetric water content at each monitoring point reaches the saturated volumetric water content, and the pore water pressure changes from negative to positive. Due to the drainage effect of the nail, the volumetric water content at each monitoring point decreased continuously after the rainfall stopped. Finally, the volumetric water content at each monitoring point was smaller than the initial state, and the pore water pressure value changed from positive to negative. The numerical simulation results are consistent with the laboratory tests. Such results show that the drainage nail has good drainage effects, which can effectively solve the problem of drainage in engineering and provide reference for drainage design. |
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| Keywords: | rainfall infiltration drainage nail water drainage volumetric water content pore water pressure |
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