IMHE OpenIR  > 山地灾害与地表过程重点实验室
Alternative TitleExperimental study on the uplift pressure of gravity check dam
Thesis Advisor游勇
Degree Grantor中国科学院大学
Place of Conferral北京
Degree Discipline建筑与土木工程
Keyword重力式拦砂坝 扬压力 坝基渗透 颗粒级配 泥石流性质
Other AbstractUplift pressure, one of the most important vertical loads acting on the check dam foundation, whose action mechanism and calculation are the crucial points for dam structural design as well as stability calculation. So far, designers usually determine the relevant parameters without scientific basis via their experience as a result of lacking reference literatures on debris dam uplift pressure home and abroad. Thus, It is urgent to study the critical technological problems that how to determine the uplift pressure’s reduction coefficient more scientific and cognize it’s action mechanism and changing process more comprehensive. Then it will get to make a better service for disaster prevention and mitigation.In order to explore uplift pressure’s action mechanism and changing process, a special experiment apparatus was designed to simulate the seepage process under the dam foundation, then a series of indoor simulation tests basing different properties of foundation soils and debris flows were conducted in this thesis. According to the analysis of experimental data, the main conclusions are listed as follows:(1) A judging criterion of seepage stability for debris dam foundation soils basing on grain composition is proposed. For the foundation soils containing clay, when 30%10%, the foundation soils are prone to be more stable; when P5≥50%, foundation deformation, foundation liquefaction and contact erosion tend to occur easily; and when P5≤30%, the dam foundation soil is susceptible to seepage deformation.(2) The properties of foundation soils and debris flows mainly affect uplift pressure’s intensity and distribution. A linear attenuation distribution characteristic of uplift pressure along the dam axis is confirmed, and the rate of attenuation are positive correlated with the uplift pressure value at the dam heel. With the prolonged deposition time of debris flow, the resultant force of the uplift pressure gradually decreases, and the resultant point gradually moves to the front of the dam.(3) A calculated formula for the uplift pressure reduction coefficient basing on the permeability coefficient of foundation soils’ has been put forward as:Ky=0.0207lnk+0.2054, and the permeability coefficient is in the range of 4.91×10-5cm/s<k<2.61×10-2cm/s.(4) Based on the fine particle concentration of debris flow slurry Cvf, a method to judge the sedimentary characteristics of debris flow with different properties is proposed as: when Cvf<0.06, the debris flow is dilute and has obvious particle sorting characteristics in the deposition process; when Cvf>0.14, the debris flow is viscous and dose not have particle sorting characteristics in the deposition process; when 0.06
Document Type学位论文
Recommended Citation
GB/T 7714
张莉. 泥石流重力式拦砂坝坝基扬压力实验研究[D]. 北京. 中国科学院大学,2018.
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