基于河道治理不同生态护坡的固土作用及效果分析

Soil Fixation Action and Effect Analysis based on Different Ecological Slope Protection of River Course Regulation

以辽宁省河道生态治理工程为依据,通过调查分析选择石笼、草皮和生态袋护坡为研究对象,探讨不同治理措施的固土作用及效果,并对草皮护坡的抗剪强度利用土样试验法进行研究。然后利用三维有限元模型和位移等值线、边坡安全系数指标评价了3种不同护坡技术的应用效果。研究表明:土体抗剪强度在草皮根系作用下明显提升,且随着含水率的增加坡抗剪强度逐渐减小;相对于水平、垂直根系复合根系具有更加明显的固土效果;生态袋、石笼和草皮生态护坡相对于无草边坡而言,均能在一定程度上提升整体边坡的稳定性及减小土体的滑动区域范围,可为河道治理和工程实践提供一定指导作用。

Based on the ecological regulation project of river course in Liaoning province,through the investigation and analysis to choose the stone cage,turf and slope protection with ecological bag as the research objects,this study explored the soil fixation function and effect of different control measures,and the shear strength of grass slope protection was researched with soil sample test method,then,3D finite element model,displacement isoline,slope safety factor index were used to evaluate the application effect of three kinds of different slope protection technology.The research shows that:shear strength of soil under the action of grass roots improves significantly,and shear strength of slope decreases with the increase of moisture content;compared with the horizontal and vertical composite roots,the soil fixation effect is more obvious;compared with the grass free slope,both ecological bag stone cage and turf ecological slope protection can improve the stability of the overall slope and reduce the sliding area of soil to a certain extent,which can provide some guidance for river management and engineering practice.