CAJ | 학술논문

为从细观角度揭示渗滤系统的渗滤机理，利用颗粒流程序建立了充分考虑流固耦合效应的基土－滤层渗滤模型，对其进行不同层间系数下的系列数值模拟试验，并对渗流过程中基土、滤层及两者界面处的孔隙率、渗透率，基土流失量等参数随渗流作用时间的演化过程进行了监测。结果显示：层间系数的取值决定着滤层是否有效及渗滤系统水力特性的优劣；对于地下集水工程中的滤层设计，应能兼顾保土性与透水性的平衡，若其含水层为均匀基土，层间系数 D15／d85不宜大于5；数值模拟试验结果与太沙基准则一致，说明采用颗粒流的方法对渗滤系统进行模拟研究是可靠的，因此可用其做更深一步的研究。
위종세관각도게시삼려계통적삼려궤리，이용과립류정서건립료충분고필류고우합효응적기토－려층삼려모형，대기진행불동층간계수하적계렬수치모의시험，병대삼류과정중기토、려층급량자계면처적공극솔、삼투솔，기토류실량등삼수수삼류작용시간적연화과정진행료감측。결과현시：층간계수적취치결정착려층시부유효급삼려계통수력특성적우렬；대우지하집수공정중적려층설계，응능겸고보토성여투수성적평형，약기함수층위균균기토，층간계수 D15／d85불의대우5；수치모의시험결과여태사기준칙일치，설명채용과립류적방법대삼려계통진행모의연구시가고적，인차가용기주경심일보적연구。
In order to reveal the percolation mechanism of the filtration system from the meso-angle ,with the particle flow software PFC3D ,a percolation model of base soil-filter was established considering the coupling effect of solid and fluid . And then a series of simulation tests were conducted with this model with different coefficients in different layers ,and the variations of porosity ,permeability ,base soil loss of the interface between the base soil and filter were traced and record-ed during the evolution process .The results indicate that the hydraulic characteristics of base soil-filter system and the ef-fectiveness of the filter layers are greatly affected by the coefficients between the layers .Moreover ,in the filter design of the underground drainage engineering ,the balance between conserving soil and maintaining permeability should be up-held .As a result ,the value of D15/d85 should be smaller than 5 if the base soil is homogeneous .What’s more ,numeri-cal simulation results are consistent with the Terzaghi criterion ,which indicates that further investigations can be conduct-ed with the PFC3D .