淤地坝对黄土高原坡沟系统重力侵蚀调控研究

坡沟系统是黄土高原的特有问题,目前有关坡沟系统重力侵蚀的研究相对较少,针对这种情况,采用了国际上最为通用的大型有限元分析软件ANSYS,结合强度折减理论,对碾庄沟流域坡沟系统概化模型在不同典型淤积厚度下的边坡稳定进行了计算,分析了随着流域淤地坝系淤积至不同的典型淤积厚度时坡沟系统的第一主应力和Y方向位移的变化云图,建立了稳定系数和淤积厚度、滑塌体积与淤积厚度的相关方程,揭示了随着淤积厚度的增加,坡沟系统稳定性逐渐增大,重力侵蚀量或侵蚀潜力显著减少的规律.

Study on the adjust-control effect of check dam on gravity erosion of slope-gully systems in the Loess Plateau

Slope-gully system is a peculiar problem in the Loess Plateau. The study on gravity erosion of slope-gully systems is relatively small. Aiming at this situation,and by means of ANSYS software and strength reduction theory, the slope stability under different typical deposition thickness is calculated by slope-gully systems physical model of Nianzhuang vally. The mutative figure first principal stress and displacement of Y direction under different typical deposition thickness are analyzed. The relationship of stability factor and deposition thickness, volume slump and deposition thickness are respectively established. Law of stability of slope-gully systems gradually increasing and gravity erosion significant reduction with increasing of deposition thickness was revealed.