Study On Ecological Slope Protection Technology Of Collapsible Loess

With the implementation of the strategy of western development in China,there are more and more engineering buildings in collapsible loess area,but the research and engineering application of vegetation protection technology of collapsible loess slope is relatively few.This paper takes the collapsible loess in the southwest side of the foundation of the tree source teaching building in the Dou Jia Shan campus of Lanzhou Institute of Resources and Environment as an example to carry out the related research on vegetation slope protection technology of collapsible loess slope in Lanzhou area.In the past,most of the methods used to strengthen or protect collapsible loess slopes were anti-slide piles,prestressed anchor cables,retaining walls and other passive measures.With the concept of "green engineering" deeply rooted in peopleundefineds hearts,In order to grasp the stress law of collapsible loess slope and the analysis of vegetation restoration,as the restoration project of ecological vegetation protection of the basic slope in collapsible loess area,the corresponding slope protection greening is carried out in detail,which not only stabilizes the slope,but also improves the stability of the slope.It also realizes soil and water conservation,beautifies environment,and provides certain technical reference for vegetation restoration of the same type collapsible loess slope in the future.Study on Ecological Restoration Technology of vegetation slope protection on collapsible loess slope in Lanzhou area.Based on vegetation investigation and vegetation restoration effect test,according to local natural climate conditions,the herbaceous plant Zoysia japonica,which is suitable for local planting and has fast root growth and less developed root system,is selected.Its varieties are low and neat,like sunshine,strong adaptability to external environment and drought tolerance.Cold resistance,trampling resistance,strong regeneration,and less developed roots have little impact on soil self-weight and a wide range of soil adaptability.It can grow and spread in collapsible loess soil,and is a good material for soil consolidation and slope protection.The stability and anti-slide property of collapsible loess slope can be further improved by rehabilitating slope vegetation,so as to improve the practicability of rehabilitating slope vegetation.Generally speaking,for collapsible loess,the slope gradient is less than 25 degrees,conventional turf planting is enough;the slope gradient is 25-35 degrees,in addition to the above plants,some shrubbery plants should be added;when the slope is more than 36,we should consider planting-some dense herbaceous plants,and take corresponding engineering reinforcement measures to protect the slope.Now,the collapsible yellow of this project case is taken.The vegetation restoration of soil slope is analyzed.The results show that the cohesion of collapsible loess increases due to vegetation restoration,and the volume moisture content varies in different depth soil layers,in which the water infiltration rate decreases gradually with the power function.The collapsibility of loess keeps a relatively stable trend in a certain period.Because of the anchoring effect of plant root system,the stability of vegetation restoration of collapsible loess slope meets the requirements of the criterion,which can effectively prevent the landslide and collapse of collapsible loess slope and control the soil erosion of collapsible loess slope.