三维土工网防护边坡侵蚀特性的试验研究

发布时间：2018-06-22 22:26

本文选题：三维土工网垫 + 坡面流　；参考：《水土保持研究》2017年01期

【摘要】：为了揭示三维土工网防护坡面侵蚀规律,利用室内模拟放水冲刷试验,定量研究了不同坡度(5°,10°,15°,20°,25°,30°)、不同流量(1 m~3/h,1.5 m3/h,2 m~3/h)条件下,三维土工网防护坡面的侵蚀过程及侵蚀特征。结果表明:(1)累积侵蚀量随坡度和流量的增大而增大,且冲刷最初10min内得到的侵蚀量占侵蚀总量的70%左右,而冲刷末期的坡面流含沙率仅在0.01~0.04g/cm~3内波动;(2)随着坡度增大,累积侵蚀量的贡献率增大,流量对累积侵蚀量起主导作用,在大流量冲刷的条件下,流量对累积侵蚀量的贡献率比流量较小时更加显著;(3)累积侵蚀量与坡度呈正相关的幂函数关系,相关性显著;(4)三维土工网防护边坡的坡面流为紊流,累积侵蚀量与雷诺系数的关系可以表示为:M=0.186Re0.672,相关系数R~2=0.9429。
[Abstract]:In order to reveal the erosion law of three dimensional earth network protection slope, the erosion process and erosion characteristics of three dimensional earth network protection slope under different slope (5 掳~ 10 掳~ 15 掳~ 15 掳~ 20 掳~ 20 掳~ 25 掳~ 30 掳~ 30 掳) and different flow rate (1 m ~ 3 / h ~ 1.5 m ~ (3 / h) ~ 2 m ~ (3 / h) were quantitatively studied by using indoor simulated flushing test. The results show that: (1) the cumulative erosion amount increases with the increase of slope and flow rate, and the erosion amount in the initial 10min accounts for about 70% of the total erosion amount, while the sediment content in the slope flow at the end of scour only fluctuates in the 0.01~0.04g/cm~3, (2) with the increase of the slope, The contribution rate of cumulative erosion amount increases, and the flow rate plays a leading role in the cumulative erosion amount. The contribution rate of the flow rate to the cumulative erosion amount is more significant than that of the small flow rate; (3) there is a positive correlation between the cumulative erosion amount and the slope gradient, and the correlation is significant; (4) the slope flow of the slope protected by the three-dimensional geotechnical network is turbulent. The relationship between the cumulative erosion amount and the Reynolds coefficient can be expressed as: 1 / M0. 186 Re0. 672, and the correlation coefficient Ru 2 0. 9429.
【作者单位】：山东大学土建与水利学院;
【基金】：国家自然科学基金“三维土工网防护边坡坡面流特性及侵蚀动力机制研究”(11372165)
【分类号】：S157

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