Open AccessAn Analysis of Optimum Thickness of Inverted Filter Layer Made by Manufactured Sand
Author(s) -
Jianxun Shi,
Lihang Hu,
Xingkai Zhang,
Jizong Liang
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/453/1/012021
Subject(s) - geotechnical engineering , geology , filter (signal processing) , suction , layer (electronics) , levee , finite element method , sand filter , flow (mathematics) , infiltration (hvac) , engineering , materials science , mechanics , structural engineering , composite material , geomorphology , mechanical engineering , physics , electrical engineering , inlet
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.