土工格室坡面侵蚀特性

Erosion Characteristics of Geocell Slope Surface

土工格室坡面由于其独特的结构特性,其侵蚀过程与传统坡面有较大差异.本文采用变坡试验水槽,研究土工格室坡面在坡面流作用下的侵蚀规律.分析土工格室坡面流的流动特点及其与普通坡面流的差异,揭示了坡面侵蚀量随坡度、流量、切应力,以及绕流雷诺数的变化规律.结果表明,坡面侵蚀量远小于无格室的坡面;坡面累计侵蚀量和绕流雷诺数之间呈良好的对数函数正相关关系;平均侵蚀率与坡度、流量、切应力之间均呈良好的幂函数正相关关系,且流量对坡面流侵蚀率的影响大于坡度,随着流量的增大土工格室坡面流侵蚀能力的增率增大.

The erosion process of geocell slope surface is different from that of traditional one, because of its unique property. This paper presents the experimental results of the geocell slope erosion under overland flow. The experiment is done in an experimental flume with different inclinations of slope. This paper first emphasizes on the characteristics of overland flow on geocell slope and its differences from traditional overland flow. Also, the relationship between erosion and slope gradient, discharge, shear stress and turbulent flow Reynolds number are discussed respectively. Research results show that erosion of geocell slope is much lower than traditional slope without geocell. Moreover,there is a positive logarithmic relationship between accumulated erosion and turbulent flow Reynolds number. Average erosion rate has a positive power relationship with slope gradient, discharge and shear stress. It also can be concluded that the discharge magnitude has a larger influence on the slope gradient in terms of erosion rate of the slope, and with the increasing of discharge magnitude, the increment rate of erosion increase correspondingly .