填埋场高密度聚乙烯膜缺陷渗漏试验及计算模型研究

Study on leakage test and calculation model of the defects high density polyethylene membrane at landfill

因施工等原因造成土工膜渗漏十分常见,但渗漏量的计算是工程建设和运营面临的重大难题。本研究通过室内试验,测试了不同高密度聚乙烯(HDPE)膜厚度(w=0.5、1.0mm)、缺陷孔径(φ=3、5、10 mm)和膜上不同压力水头(h=0.3、0.5、0.65、0.8 m)时的缺陷渗漏量,并建立数学模型进行拟合。结果表明:相对于膜厚度而言,膜缺陷大小和压力水头高度对渗漏量的影响更大;渗漏量可表达为膜缺陷大小和水头高度的幂函数,但不同工况下的系数有别,因此实际工程应通过试验方式确定。

Geomembrane leakage caused by construction and other reasons is very common,but the calculation of leakage is a major challenge in engineering construction and operation.Through laboratory experiment,this study tested the leakage of the defected geomembrane at different thickness of high density polyethylene（HDPE） film（w=0.5,1.0 mm）,different defect aperture（φ=3,5,10 mm）,and different pressure head（h=0.3,0.5,0.65,0.8 m）,and then established a mathematical model.The fitted results show that：The defect aperture and pressure head had a greater influence on the leakage than the film thickness.The leakage could be expressed as the power function of the defect aperture and pressure head,but the coefficients in different working conditions were different;therefore,it should be determined experimentally for the actual project.