Abstract
In order to solve the adverse effect that the lining of high groundwater level channels is prone to damage when subjected to heavy rainfall, the response law of internal structural state of high groundwater level channels under different rainfall conditions was studied. Based on the non-seepage seepage theory, the seepage pressure (total water head) in the tunnel under four different rainfall types is analyzed and studied. The results show that the most unfavorable rainfall types for the lining structure safety are the frontal rainfall and uniform type rainfall. Therefore we should pay more attention to the front type and uniform type rainfall from the perspective of seepage. The research results can provide reference for slope and seepage control design of high groundwater level channels.
Highlights
In the layout and structure design of large flow and long distance water supply or irrigation channel, it is often encountered that the channel passes through the area of high groundwater level due to the influence of topographic and geological conditions
Rainfall is one of the important factors affecting the safety of slope and lining structure of high groundwater level channel
Zeng Ling et al [4] proposed a method for stability analysis of embankment slope based on saturated-unsaturated seepage and unsaturated shear strength theory
Summary
In the layout and structure design of large flow and long distance water supply or irrigation channel, it is often encountered that the channel passes through the area of high groundwater level due to the influence of topographic and geological conditions. Rainfall is one of the important factors affecting the safety of slope and lining structure of high groundwater level channel. Due to the lack of corresponding drainage system, some high groundwater channels will produce large uplift pressure under the condition of heavy rainfall and cause damage to the lining structure of the channels [6].For example, the groundwater level near a section of the main canal of the middle route of the South-to-North Water Diversion Project is high. The rise of groundwater level caused by river leakage seriously affects the stability of the canal lining structure [7] It is an important content in the design of canal to eliminate the adverse effect of groundwater on the lining plate by taking engineering measures. The results can be used as the reference of optimal design of high groundwater canal slope and management
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