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陈亮,陈成,何健健.考虑相对暴露度的无粘性土临界流速计算方法探讨[J].河北工程大学自然版,2019,36(1):54-58
考虑相对暴露度的无粘性土临界流速计算方法探讨
A Theoretical Calculation of Critical Flow Velocity of Non-cohesive Soil Considering Relative Exposure
投稿时间:2018-10-18  
DOI:10.3969/j.issn.1673-9469.2019.01.012
中文关键词:  临界流速  相对暴露度  无粘性土  渗流方向
英文关键词:critical flow velocity  relative exposure  non-cohesive soil  relative exposure degree
基金项目:国家自然科学基金资助项目(51778210);江苏省自然科学基金资助项目(BK20151495)
作者单位
陈亮 河海大学 岩土力学与堤坝工程教育部重点试验室, 南京 210098
河海大学 岩土工程科学研究所, 南京 210098 
陈成 河海大学 岩土力学与堤坝工程教育部重点试验室, 南京 210098
河海大学 岩土工程科学研究所, 南京 210098 
何健健 河海大学 岩土力学与堤坝工程教育部重点试验室, 南京 210098
河海大学 岩土工程科学研究所, 南京 210098 
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中文摘要:
      研究建立了基于泥沙运动力学理论的土颗粒起动模型,在考虑相对暴露度基础上,推导了土体渗流引起内部侵蚀的临界流速计算公式。通过与试验测得临界流速值对比,发现试验值与计算值较为一致。讨论了临界流速计算值与试验值的差异和相对暴露度与临界流速关系。渗流过程中颗粒堆积,会导致颗粒运移通道阻塞,使临界流速试验值大于计算值。临界流速与土颗粒相对暴露度正相关,不同渗流方向下相对暴露度对临界流速影响程度不同,水平渗流时相对暴露度影响较大,垂直渗流时,相对暴露度对临界流速几乎没有影响。
英文摘要:
      In this paper, a soil particle starting model based on the theory of sediment motion mechanics is established. Based on the relative exposure, the formula for calculating the critical velocity of internal erosion caused by soil seepage is derived. Comparing with the critical flow rate measured in the test, it is found that the test value is consistent with the calculated value. The difference between the calculated value of the critical flow rate and the experimental value and the relationship between the relative exposure and the critical flow rate are discussed. The accumulation of particles during the seepage process will cause the particle transport channel to block, and the critical flow rate test value is greater than the calculated value. The critical flow rate is positively correlated with the relative exposure of soil particles. The relative exposure degree has different influence on the critical flow rate in different seepage directions. The relative exposure has a great influence on horizontal seepage. For the vertical seepage, the relative exposure has little effect on the critical flow velocity.
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