依托当地原料设计制备水工反滤料

Design and Preparation of Hydraulic Filter Media Based on Local Raw Materials

按照当地现有砂石骨料特性设计反滤料上下包线、配备反滤料可有效降低施工成本。以反滤料的“填充细料”来保护防渗土体的“填充细料”,以刚好填满反滤料的“骨架粗料”间隙为设计依据,符合《碾压式土石坝设计规范》用防渗土体的“细粒部分”来设计宽级配反滤料“细粒部分”的原则,保证反滤料发挥排水、反滤、裂后自愈、自身稳定等基本功能。施工图设计前先筛查清楚当地一定范围内可利用的人工、天然的砂石骨料理学性质,选取级配曲线最好的一、二种料,以此设计出切合当地实际的反滤料上、下包线。施工时,通过对几种当地砂石骨料筛分、自由组合、调整各组分比例的方法,调制出介于设计上、下包线之间反滤料。

According to the local existing sand and gravel aggregate characteristics,the upper and lower wrapping lines of filter media are designed and equipped with filter media.The“filling fine material”of anti-seepage soil is used to protect the“filling fine material”of antiseepage soil,and the gap of the“skeleton coarse material”just filling the anti-seepage soil is used as the design basis,which is in line with the principle of designing the“fine part”of wide-graded anti-seepage soil in the Design Code of Roller Compacted Earth-Rock Dams so as to ensure that the anti-seepage material can fulfill the basic functions of drainage,anti-filtration,self-healing after cracking and self-stabilization.Before the design of the construction drawing,the physical properties of the artificial and natural sand and gravel aggregates available in a certain local area should be screened clearly,and the first and second materials with the best gradation curve should be selected so as to design the upper and lower envelopes of the filter material which are in line with the local reality.During construction,the filter material between the designed upper envelope and the lower envelope was prepared by screening several local sand and gravel aggregates,freely combining and adjusting the proportion of each component.