不同土壤前期含水量对土壤分离临界水动力学特性及其抗剪强度的影响

发布时间：2018-04-15 04:27

本文选题：土壤分离 + 土壤前期含水量　；参考：《水土保持学报》2017年01期

【摘要】：通过实测不同土壤前期含水量(5%~23%)和坡度(1°~10°)条件下黄壤坡面土壤分离临界水动力参数,并结合不同土壤含水量(3%~23%)对土壤抗剪强度的影响,综合分析及探讨不同土壤前期含水量、坡度和土壤抗剪强度与临界水动力特性的关系。结果表明:临界流量与不同土壤前期含水量和坡度呈幂函数减小关系,并提出一种能够体现土壤前期含水量和坡度共同作用对临界水动力参数影响的预测方程。在坡度小于5°时,土壤前期含水量对临界水动力学参数影响较小,可直接采用简化的幂函数关系进行计算。土壤黏聚力随土壤含水量的增加先出现峰值后逐渐减小至稳定;与土壤黏聚力的变化趋势不同,土壤分离临界水动力参数则逐渐减小。
[Abstract]:In this paper, the critical hydrodynamic parameters of soil separation on yellow soil sloping surface were measured under the conditions of different soil water content (5 ~ 23) and slope degree (1 掳~ 10 掳). Combined with the effect of different soil moisture content on soil shear strength, the water content of different soil Prophase was comprehensively analyzed and discussed.The relationship between slope and soil shear strength and critical hydrodynamic characteristics.The results showed that the critical flow rate was reduced by power function with different soil water content and slope, and a prediction equation was put forward, which could reflect the influence of soil water content and slope on the critical hydrodynamic parameters.When the slope is less than 5 掳, the influence of soil water content on the critical hydrodynamic parameters is small, and the simplified power function can be directly used to calculate the soil moisture content.With the increase of soil water content, the soil cohesion appeared at first peak and then decreased to stability, and the critical hydrodynamic parameters of soil separation decreased gradually, which was different from the change trend of soil cohesion.
【作者单位】：北京林业大学水土保持学院;北京林业大学重庆缙云山三峡库区森林生态系统国家定位观测研究站;
【基金】：国家自然科学基金项目(41401299)
【分类号】：S157.1

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