Experimental Study On Stability Of Ecological Slope Borrowed Soil In Anchoring,Supporting,Encapsulating Solid-soil Structure With Double-layer Net

With the rapid development of national infrastructure,the problem of ecosystem degradation caused by human activities is becoming increasingly serious,which has restricted the sustainable development of our society and economy.Especially in the process of highway excavation and building construction,a large number of artificial rock and soil slopes are formed.The traditional slope protection technology used in the slope support process not only destroys the original local ecological balance,but also consumes a lot of non-environmentally friendly materials,its consumption is inconsistent with the concept of "green development".In order to solve such problems,ecological slope protection technology has been developed.On the other hand,for high-steep rock and soil slopes,it is difficult to maintain the stability of the borrowed soil with ordinary ecological slope protection technology,and anchoring,supporting,encapsulating solid-soil structure with double-layer net is specifically designed to solve the problem of stability of the borrowed soil on high-steep slopes.The new technology developed is a new technology integrating slope protection and greening.In this paper,the indoor full-scale test of slopes with varying slope angles is performed to study the stress modes of the main structures in anchoring,supporting,encapsulating solid-soil structure with double-layer net.The force sharing ratio and the change trend of the stress and strain of the diaphragm plate,the top reinforcement structure,and the bottom reinforcement structure after changing the distance between the diaphragm plate,and the failure mode of the borrowed soil are analyzed.On this basis,numerical simulations and field tests were carried out to verify the research results.The main work and research results of this article are as follows:(1)The laboratory full-scale test of indoor rock ecological slope stability of borrowed soil was carried out.By changing the angle of the slope model,the failure mode of the borrowed soil layer under anchoring,supporting,encapsulating solid-soil structure with double-layer net was observed and summarized.The conclusions are:the failure mode of the borrowed soil layer under anchoring,supporting,encapsulating solid-soil structure with double-layer net is divided into two parts,the upper part slides as a whole,the sliding surface is the interface between the borrowed soil layer and the original slope,and the lower part of the borrowed soil Stacking occurred above the diaphragm plate,the accumulation volume decreases with the decrease of the distance between the diaphragms until no accumulation occurs.In this failure mode,the possible failure modes of the solid-soil structure are as follows:diaphragm bursting and tearing failure,top reinforcement structure bursting and shearing failure,connecting structure pulling failure,anchor shear failure.(2)Collect the stress-slope angle curves of the diaphragm,the top reinforcement structure,and the bottom reinforcement structure by attaching strain gauges to the protective structure,and analyze the ratio of the three to the remaining sliding force of the borrowed soil layer.The results show that when the spacing between the diaphragms is 25cm?50cm and 75cm,the sharing ratios of the diaphragm,the top reinforcement structure and the bottom reinforcement structure to the remaining sliding force are 0.677:0.165:0.158?0.676:0.187:0.137?0.696:0.153:0.15?Increasing the distance between diaphragms to 150cm,and the accumulation of borrowed soil will cause the top reinforcement structure to bulge,and the sharing ratio of the top reinforcement structure will increase accordingly,the sharing ratio of diaphragm,top reinforcement structure and bottom reinforcement will increase,the sharing ratio of the three structures is 0.470:0.422:0.108.(3)Through the full-scale test of the stability of the borrowed soil of the rocky ecological slope,the angle of the failure slope of the borrowed soil layer under different protective structure in the anchoring,supporting,encapsulating solid-soil structure with double-layer net was recorded,and the protective capabilities of the various protection measures were compared.The results show that:the top reinforcement structure has the worst protection ability,and the slope rotates to 52 degrees for sliding failure;the bottom reinforcement structure with diaphragm plate takes second place,and the slope rotates to 57 degrees for sliding failure;the solid-soil structure with double-layer net has the strongest protection and protection ability,and the protection ability gradually increases with the decrease of the distance between the diaphragm plate:when the distance between the diaphragm plates is 150cm,the slope is rotated to 63 degrees and the slide is damaged.When the distance between the diaphragm plates is 75cm,the slope is destroyed.Rotate to 71 degrees for sliding failure.When the diaphragm plates spacing is 50cm,the slope is rotated to 82 degrees for sliding failure.When the diaphragm plates distance is 25cm,the slope is rotated to 90 degrees for sliding failure.(4)Through the combination of test and simulation results,it is found that after the borrowed soil is sprayed on the slope with the protection of anchoring,supporting,encapsulating solid-soil structure with double-layer net,the stability of the borrowed soil is enhanced.The ability is to increase the protective ability of the solid soil structure;after the spacing of the diaphragms is reduced,the tensile force of each solid soil structure is reduced to varying degrees;after the distance between the diaphragms plate decreases,the stability of the borrowed soil layer,that is,the protection ability of the solid-soil structure,increases;after the distance between the diaphragms plate decreases,the tensile force of each solid-soil structure decreases.(5)Field application shows that the borrowed soil layer has been kept in a stable state since the end of spraying,after rainfall,and during the growth of seedlings under the protection of anchoring,supporting,encapsulating solid-soil structure with double-layer net.And the seedlings grow well,the slope greening effect gradually increases with time.The anchoring,supporting,encapsulating solid-soil structure with double-layer net can maintain the stability of the borrowed soil layer of high-steep rock slopes and a good slope greening effect.