IMHE OpenIR  > 山地灾害与地表过程重点实验室
Alternative TitleExperimental Study on Characteristics of Debris Flow Deposition and the Uplift Pressure of a Check Dam
张莉1,2,3; 游勇1,2; 柳金峰1,2; 孙昊1,2,3; 刘道川1,2,3
Corresponding Author游勇
Source Publication山地学报
Contribution Rank1
Other AbstractSediment deposition and pore water dissipation are two processes in which excess pore water pressure evolves into effective stress during debris flow deposition. Pore water dissipation directly affects the magnitude and variation of dam foundation uplift pressure,thus compromising the stability of check dams. In this study,a special experimental apparatus was designed to simulate debris flow deposition and dam foundation seepage. In order to investigate the sediment sorting characteristics and its influence on uplift pressure,six groups of laboratory model experiments were conducted. During each test,pore water pressure at the depositional bottom of debris flow and uplift pressure at check dam foundation were collected using six water pressure sensors. Slurry deposition rates of debris flows with different densities were measured by video recorders. The results indicated that sediment sorting and pore water dissipation properties were interrelated with the uplift pressures in the debris flow deposition process. Particle sorting occurred when dilute debris flows started to deposit,where the upper slurry deposition rates was found to be negatively correlated with debris flow density. Experimental results indicated that the pore water pressure at the depositional bottom attenuated logarithmically with an attenuation coefficient that correlated linearly with the upper slurry deposition rate. Meanwhile, the dam foundation uplift pressure attenuated logarithmically and showed a linear variation with the pore water pressure at the depositional bottom. By this study a comprehensive understanding about uplift pressure generating mechanisms in check dam foundations was obtained,with particular focus on the debris flow deposition and pore water dissipation processes. New perspective has been gained in determining uplift pressures in check dam designs,thus providing better technical support and reference for debris flow disaster prevention and mitigation.
Keyword泥石流 拦砂坝 颗粒沉降 孔隙水压力消散 扬压力
Indexed ByCSCD
Citation statistics
Cited Times:2[CSCD]   [CSCD Record]
Document Type期刊论文
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
张莉,游勇,柳金峰,等. 泥石流拦砂坝坝前沉积与坝基扬压力实验研究[J]. 山地学报,2018,36(2):271-279.
APA 张莉,游勇,柳金峰,孙昊,&刘道川.(2018).泥石流拦砂坝坝前沉积与坝基扬压力实验研究.山地学报,36(2),271-279.
MLA 张莉,et al."泥石流拦砂坝坝前沉积与坝基扬压力实验研究".山地学报 36.2(2018):271-279.
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