Research On Slope Ecological Protection Technology Of Straw Reinforced Cement-Soil Hollow Block

In the ecological protection of granite residual soil slopes,most of the protective forms had the disadvantages that grass seeds were easily washed away by rain and the survival rate of the grass was low before the vegetation was fully developed,which led to the failure of slope vegetation protection and serious loss of topsoil.As a form of ecological protection,the hollow hollow-grassed grass block has good rainwater washout performance and can provide plants with an excellent growing environment.However,the application of this method in engineering has the disadvantages of high cost,large consumption of cement gravel,and high transportation cost,which affects the popularization and application of this method.In view of the idea of waste utilization and sustainable development,this paper proposes a kind of straw-formed hollow block made of rice straw,waste soil after excavation and a small amount of cement.This kind of hollow block made from rice straw-reinforced cement-soil material can not only exert the advantages of preventing the strong rainfall scouring of the concrete hollow block,but also promote the rapid growth of vegetation on the slope surface,reduce the construction cost,and save energy and environmental protectionThe main research contents and research results of this paper are as follows:(1)Through the experiment of unconfined compressive strength,the suitable reinforcement length of rice straw reinforced concrete-cement hollow block is 15 mm,and the mass reinforcement ratio is 0.25%.(2)Simulate the rainfall scouring test through the indoor slope.The results show that compared with the three-dimensional geonet and the unprotected bare slope,the rice straw reinforced soil-cement hollow block has strong anti-erosion ability and can greatly reduce the drop of raindrops and make the slope of the cumulative sediment erosion reduce 70-80%.(3)MIDAS GTS/NX was used to carry out finite element numerical simulation on the slope protection of rice straw reinforced soil-cement hollow block.The simulation results show that the safety factor of the hollow block is higher than that of the unprotected slope.(4)Under the same specifications,the cost of rice straw reinforced cement hollow block is about 40%lower than that of ordinary concrete hollow block.Considering the practical application of the project and the cost of the project,the most economical and reasonable ratio of rice straw reinforced cement hollow block is:0.25%straw reinforcement,15mm reinforced length,15%cement,and 16%moisture content.