砂穴式入渗初步试验研究

以双重介质渗流理论为基础, 借鉴复合地基施工技术, 选取冲积砂、河砂等作为试验填充材料, 在粉砂、中砂地 层中开展砂穴式入渗试验, 研究了砂穴这一入渗方式的入渗效率。结果表明: 分选好的多孔介质更适宜作为砂穴填 料; 河砂作为填料比冲积砂入渗效果更好; 入渗效率受受水介质影响明显。在不同岩性中利用穴式入渗, 入渗效率 明显不同。中砂地层的入渗效率是粉砂地层的 71 6 倍, 是粉砂地表入渗的 481 1 倍。在同一岩性中利用不同的入渗 方式, 其入渗效率有很大差距。在粉砂地层中利用穴式入渗, 其入渗效率是粉砂地表的 61 3 倍。砂穴式入渗是一种 可以加快入渗速率可操控性的技术方法, 它将促进渗流理论转化为减轻雨洪灾害的技术形成生产力服务于城市( 或 者山区) 洪涝减灾, 提高水资源的有效利用水平, 促进水循环体系自我恢复和良性发展。 Acco rding to the double por osity media f low theor y and the co nstr uction technolog y of com posite f oundatio n, with al2 luv ial sand and riv er sand as ex perimental padding, we carried out a sand ho le infilt ratio n test in the silt and medium sand st rata, and studied the efficiency of sand ho le infiltr atio n. The r esults show ed that the separated por ous media w as mor e suitable for filling sand holes. River sand was mor e effective as padding than alluvial sand. Infilt ratio n efficiency was o bv io usly affected by a2 queo us medium. Using sand hole infiltration for differ ent litho log ical char acteristics showed obviously differ ent infilt ratio n effi2 ciency. The infiltration eff iciency of medium sand st ratum w as 71 6 t imes o f that of the silt str atum and 481 1 t imes o f that of the silt surface. U sing different infiltration mo des for the same lit ho lo gical char acteristic also show ed v ery different infiltrat ion effi2 ciency. The infilt ratio n efficiency of silt stratum was 61 3 times of that of t he silt surface. Sand hole infiltration is a manag eable technical metho d w hich can speed up the inf ilt ratio n r ate. It w ill pr omot e the co nv ersio n of the per co lation t heo ry into t echnolo2 g ies for alleviating flo od disasters in urban o r mountainous ar eas. It w ill enhance the effect ive ut ilizat ion of water resources, and pr omot e t he self2r ecover y and healt hy dev elopment of w ater cycle sy stem. 中国地质科学院基本业务费项目( YYFM 201624)