土工织物反滤层对多孔管汇流量影响的试验研究

Experimental study on effect of geotextile filter layer on flow rate of perforated pipe

为了探究土工织物反滤层对多孔管汇流量的影响,以室内试验为主结合理论分析进行探究.设置5种面密度的短纤针刺非织造土工布、4种层数,共20组试验.观测记录不同工况下多孔管汇流量的情况.通过量纲分析土工织物反滤层对多孔管汇流量的关系函数式,对其进行回归分析,得到土工织物反滤层参数与多孔管汇流量之间的关系表达式,计算所得的汇流量与试验值误差较小,具有较高的准确度,可用于指导实际工程;在多孔管参数一定时,土工织物反滤层下多孔管的汇流量与土工织物的面密度和层数有关.通过试验数据分析可知:土工织物反滤层面密度一定时,多孔管汇流量随着土工织物层数的增加而减小,且速率减小;在土工织物层数一定时,多孔管汇流量随着面密度的增加而减小,因此在实际工程中合理地选择土工织物的面密度和层数可达到更好的技术效果和经济效果.

In order to explore the influence of the geotextile filter layer on the flow rate of the perforated pipe,indoor experiments were combined with theoretical analysis.5 kinds of staple fiber needle-punched nonwoven geotextiles with 4 kinds of areal density and 4 kinds of layers were set up for a total of 20 sets of tests.The flow rate of porous manifolds under different working conditions was observed and recorded.Through the dimensional analysis of the relational function formula of the geotextile filter layer to the flow rate of the porous manifold,regression analysis was performed to obtain the relationship expression between the parameters of the geotextile filter layer and the flow rate of the porous ma-nifold,and the calculated sink flow has a small error and high accuracy with the test value,which can be used to guide the actual project.When the parameters of the porous pipe were fixed,the confluence of the porous pipe under the geotextile filter layer was related to the surface density and the number of layers of the geotextile.The analysis of the test data shows that when the geotextile filter layer density is constant,the water volume of the porous manifold decreases with the increase of the number of geotextile layers,and the rate decreases.When the number of geotextile layers is constant,the water volume of the porous manifold decreases with the surface density increases.Hence,a reasonable selection of the surface density and number of layers of geotextiles in actual engineering can achieve better technical and economic effects.