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中文摘要：
根据渗流理论，以不同密实度的无砂混凝土板为研究对象，通过模型试验，探讨无砂混凝土板在经过含沙水流过流前后，其渗水效率产生的变化以及规律。根据试验结果可以得出：含沙水流对无砂混凝土板的淤塞效果是明显的，渗流量成倍数减小。在淤塞前，无砂混凝土板的密实度越小渗流量越大；在淤塞后，无砂混凝土板密实度越小，其淤塞效果越明显。无砂混凝土板的表面淤积层对板的渗流能力起到重要的影响作用。无砂混凝土板经过反冲洗，其渗流能力能有明显的恢复。
英文摘要：
According to the seepage theory ,this paper ,discusses the change and the rule on the seepage efficiency before and after the silted to the sandless concrete slab with different densities of no sand concrete slab as the research object ,through the model test . According to the experimental results obtained：the silted effect is obvious seepage flow into ratio ;the smaller density of the sandless concrete slab ,the larger seepage quantity .After the silted ,the smaller density of the sandless concrete slab the more obvious of the silted effect .Sandless concrete board after backwashing ,the seepage capacity can be restored obviously .
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3-D numerical investigation of the wall-bounded concentric annulus flow around a cylindrical body wi
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