An Analysis of Optimum Thickness of Inverted Filter Layer Made by Manufactured Sand. Issue 1 (March 2020)

• Record Type: Journal Article
• Authors: Shi, Jianxun; Hu, Lihang; Zhang, Xingkai; Liang, Jizong
• Is Part Of: IOP conference series. Volume 453:Issue 1(2020)
• Publication Date: 2020-03
• Subjects: Earth sciences -- Periodicals; Environmental sciences -- Congresses; Environmental sciences -- Periodicals; 550.5
• DOI: 10.1088/1755-1315/453/1/012021
• Languages: English
• ISSNs: 1755-1307

Abstract

Abstract: The soil stability problem caused by seepage is a hot issue in geotechnical engineering, which is widely existed in natural and artificial slope, embankment, earth-rock dam and other projects. The traditional seepage calculation only considers the saturated seepage, ignoring the unsaturated seepage, and in the design of the filter layer, the thickness of the filter layer is mainly determined by experience. This study, for above problems, finite element numerical simulation method was used to simulate different thickness of filter layer, and seepage analysis in the unsaturated zone was carried out and obtained that 0.8m was the optimal thickness of filter layer in the calculation example; due to the siphon effect of matric suction, water flow also exists in the unsaturated area, and the infiltration line is not the uppermost line in the flow network; when the free water is a little lower than the height of the corewall, it will increase the seepage flow on the corewall of the dam, intensify the seepage contact and erosion, cause damage to the dam body.