帮助 关于我们

返回检索结果

泥石流拦砂坝坝前沉积与坝基扬压力实验研究
Experimental Study on Characteristics of Debris Flow Deposition and the Uplift Pressure of a Check Dam

查看参考文献22篇

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  
文摘 泥石流在坝前堆积固结的过程发生泥石流浆体中固体颗粒沉降和孔隙水压力消散,它直接影响了坝基扬压力大小和变化,对坝体稳定性造成影响。本文通过自制实验模型装置模拟不同密度泥石流作用在坝前的沉积渗透过程,观测不同密度泥石流坝前沉积特征和浆体细颗粒沉降速率,并通过水压传感器测得坝前沉积底部孔隙水压力和坝基扬压力随沉积时间的变化过程,最后结合不同密度泥石流沉积特征分析了泥石流沉积过程对扬压力衰减过程的影响。研究结果表明:稀性泥石流沉积过程中具有明显的颗粒分选性,且浆体细颗粒沉降速率与泥石流密度表现出线性负相关性;泥石流沉积底部孔隙水压力随沉积时间呈指数衰减趋势,拟合指数函数系数与上部浆体细颗粒沉降速率满足线性正相关性;沉积过程中坝基扬压力与坝前沉积底部孔隙水压力具有相同的对数衰减趋势,两者呈线性正相关性。本研究着眼于拦砂坝扬压力产生机制,研究了泥石流坝前颗粒沉积和水力扩散过程对坝基扬压力变化过程的影响,为拦砂坝扬压力计算提供了新的视角,具有一定的工程和理论意义。
其他语种文摘 Sediment 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.
来源 山地学报 ,2018,36(2):271-279 【核心库】
DOI 10.16089/j.cnki.1008-2786.000322
关键词 泥石流 ; 拦砂坝 ; 颗粒沉降 ; 孔隙水压力消散 ; 扬压力
地址

1. 中国科学院山地灾害与地表过程重点实验室, 中国科学院山地灾害与地表过程重点实验室, 成都, 610041  

2. 中国科学院、水利部成都山地灾害与环境研究所, 成都, 610041  

3. 中国科学院大学, 北京, 100049

语种 中文
文献类型 研究性论文
ISSN 1008-2786
学科 地质学
基金 中国科学院STS项目 ;  国家科技支撑计划项目
文献收藏号 CSCD:6241019

参考文献 共 22 共2页

1.  Iverson R M. A depth-averaged debris-flow model that includes the effects of evolving dilatancy.I.Physical basis. Proceedings of the Royal Society A Mathematical Physical & Engineering Sciences,2014,470(2170):20130819 被引 23 次    
2.  Cui Peng. Study on conditions and mechanisms of debris flow initation by means of experiment. Chinese Science Bulletin,1992,37(9):759 被引 32 次    
3.  Takahashi T. Debris flow:mechanics, prediction and countermeasures,2014:1-36 被引 1 次    
4.  Iverson R M. The physics of debris flows. Reviews of Geophysics,1997,35(3):245-296 被引 160 次    
5.  崔鹏. 泥石流运动阻力特性及其研究进展. 四川大学学报(工程科学版),2016,48(3):1-11 被引 10 次    
6.  费祥俊. 泥石流运动机理与灾害防治,2004:22-33 被引 3 次    
7.  倪晋仁. 阵性泥石流运动与堆积的欧拉─拉格朗日模型──Ⅰ.理论. 自然灾害学报,2000,9(3):8-14 被引 9 次    
8.  Haas T. Effects of debris flow composition on runout,depositional mechanisms,and deposit morphology in laboratory experiments. Journal of Geophysical Research-Earth Surface,2015,120(9):1949-1972 被引 12 次    
9.  Major J J. Gravity-Driven Consolidation of Granular Slurries:Implications for Debris-Flow Deposition and Deposit Characteristics. Journal of Sedimentary Research,2000,70(1):64-83 被引 6 次    
10.  Major J J. Debris-flow deposition:Effects of pore-fluid pressure and friction concentrated at flow margins. Geological Society of America Bulletin,1999,111(10):1424-1434 被引 22 次    
11.  Hampton M A. Buoyancy in Debris Flows. Journal of Sedimentary Research,1979,49(3):753-758 被引 1 次    
12.  Pierson T C. Dominant particle support mechanisms in debris flows at Mt Thomas,New Zealand,and implications for flow mobility. Sedimentology,1981,28(1):49-60 被引 11 次    
13.  He Songtang. Natural consolidation characteristics of viscous debris flow deposition. Journal of Mountain Science,2016,13(10):1723-1734 被引 2 次    
14.  Boerr D. The effect of uplift in liquidsaturated porous solids-Karl Terzaghi's contributions and recent findings. Geotechnique,1997,47(2):289-298 被引 4 次    
15.  金峰. 扬压力问题存在的分歧及最新进展. 水力发电学报,2009,28(3):62-68 被引 4 次    
16.  Barla G. Stress and seepage analyses for a gravity dam on a jointed granitic rock mass. Proceedings of the First International UDEC/3DEC Symposium. 29,2004:263-268 被引 1 次    
17.  钟敦伦. 泥石流灾害及防治技术,2014:250-251 被引 2 次    
18.  李德基. 泥石流减灾理论与实践,1997:96-98 被引 2 次    
19.  邱贤德. 堆石体粒径特征对其渗透性的影响. 岩土力学,2004,25(6):950-954 被引 36 次    
20.  康志成. 中国泥石流研究,2004:119-123 被引 1 次    
引证文献 3 篇

1 刘兴荣 泥石流拦挡坝破损分析及优化对策———以陇南市武都区为例 山地学报,2020,38(3):473-482
被引 4 次

2 刘茂 水平岩土层实体拦砂坝基底水压力研究 工程地质学报,2020,28(5):1140-1146
被引 2 次

显示所有3篇文献

论文科学数据集

1. 中国强震区泥石流淤埋沉积物固结特性与承载力试验数据（2019-2021）

2. 西藏林芝古乡沟天磨沟培龙沟泥石流监测部分数据（2019-2020）

数据来源：
国家青藏高原科学数据中心

1. 岷江上游土地利用对泥石流发生敏感性分析数据集（2005-2013年）

2. 龙溪河流域泥石流及其土地利用背景数据集（2011）

数据来源：
国家对地观测科学数据中心
PlumX Metrics
相关文献

 作者相关
 关键词相关
 参考文献相关

版权所有 ©2008 中国科学院文献情报中心 制作维护：中国科学院文献情报中心
地址：北京中关村北四环西路33号 邮政编码：100190 联系电话：(010)82627496 E-mail:cscd@mail.las.ac.cn 京ICP备05002861号-4 | 京公网安备11010802043238号