Study on shallow stability of new assembled ecological protection slopes
Slope ecological protection can protect the slope from rainwater erosion which leads to instability failure.However,in the most of the existing slope ecological protection structures,concrete pouring construction and grouting anchor are used,which are relatively cumbersome and require a long on-site operation time.In response to these problems,a new assembled ecological protection structure is proposed,which consists of small umbrella anchors,assembled concrete slope protection components and as-sembled ecological vegetation layers.And the shallow stability of the soil slope using new assembled ecological protection structure was studied.Firstly,indoor model tests were conducted to verify the anchoring performance of small umbrella anchors.Secondly,based on the composition and mechanical characteristics of the new protection structure,a formula for the safety factor of shallow stability of the protected slope was derived.Combined with a practical slope in reconstruction and extension project of Lijiang air-port,the influence of key factors such as anchor force and anchor spacing on the shallow stability of the slope was analyzed.Final-ly,based on the limit equilibrium method,a numerical analysis was conducted to study the potential instability states of slopes un-der different protection conditions.The results showed that the suitable range for the anchor spacing of the new assembled slope protection structure was 1.5～2.5 m,and compared to simple small umbrella anchor support and lattice support,the new assem-bled ecological protection structure can not only strengthen the shallow stability of the slope,but also avoid local damage,give full play of the strength of the underlying soil layers,and improve the overall stability of slopes.Meanwhile,the new structure has the advantages of convenient construction,taking effective immediately after installation,and easy local demolition and replacement.
国家科技期刊平台
NSTL
万方数据
