砂砾石料渗透特性试验研究

砂砾石料由于浑圆度较好,施工易离析,其渗流特性是工程界关心的重点。本文开展了砂砾石料分别在水平方向、从上向下以及从下向上三种水流方向下的渗流特性试验研究。试验结果显示,砂砾石料在水流方向水平向状态下的渗透系数明显高于垂直向渗透系数、水流方向从上向下状态下的破坏坡降明显高于水流方向从下向上的破坏坡降,同时对不同水流方向对砂砾石料渗流特性影响的的原因进行了初步的分析。坝体渗流计算时应根据水流方向的不同选择相应的试验参数。

Experimental Study on Seepage Properties of Sandy Gravel

Owing to its satisfactory roundness and easy separation in construction,the seepage property of sandy gravel has been highlighted by the engineering world.Here,the experimental studies on seepage properties of the sandy gravel are carried out under 3 kinds of flow directions,that is,horizontal,downward and upward directions.The test results show that the seepage coefficient of the sandy gravel under the horizontal direction of flows is evidently larger than that under the vertical direction of flows,and the failure gradient of the sandy gravel under the downward direction of flows is obviously larger than that under the upward direction of flows.Simultaneously,the causes for the influences of different flow directions on the seepage properties of the sandy gravel are preliminarily analyzed.For the calculation of seepage in dams,the relevant test parameters should be selected according to different flow directions.