| The ecological bag slope protection technology has been widely used in related fields such as civil engineering,water conservancy,environment,and agriculture.In order to facilitate construction,the filling material is often sourced locally.Solid waste,such as fly ash,may be present in the material,which may pose a threat to the environment.Additionally,the stability of the ecological bag surface layer under settlement and fluid-solid coupling in waterfront environments is often difficult to accurately predict,and in many cases,estimates are made based on experience.However,the settlement and safety factors obtained from experience often have a significant difference from the actual situation,and in serious cases,it may even affect the safety of the structure.In view of the above issues,this article studied the precipitation rate,strength change law,settlement deformation law of fly ash soil used as the filling material in ecological bags under different ratios through indoor scouring tests,triaxial tests,uniaxial tests,and consolidation tests.The formula for calculating the surface layer settlement of ecological bags was proposed.Additionally,based on Abaqus finite element software,the consolidation settlement law of ecological bags under different compaction degrees and the stability changes of ecological bag slope test sections under different drainage conditions were simulated.The following research results and conclusions were mainly obtained:(1)By setting the fly ash content to 0%,5%,10%,15%,and 20% in five groups of tests,the ecological bag scouring test yielded final precipitation rates of 2.6%,1.50%,0.92%,1.12%,and 1.41% respectively after 4 days of scouring.The experimental results show that the addition of fly ash can reduce soil precipitation.The precipitation rate of soil with a fly ash content of10% was 64.6% lower than that of soil without fly ash.(2)By setting the fly ash content to 0%,5%,10%,15%,and 20% in five groups of tests,it was found that under the same water content and compaction degree,adding an appropriate amount of fly ash can improve the compressive strength of ecological bags.The compressive strength of ecological bags with a fly ash content of 20% was 7.4 MPa,which was 12% higher than that of the soil without fly ash.At the same time,by setting three groups of tests with filling degrees of 70%,80%,and 90%,the results showed that the strength of ecological bags decreased as the filling degree increased.(3)By using a self-made consolidation test device and setting a 4-level load to pressurize the ecological bag,the changes in settlement deformation were observed as the load increased.The results showed that as the preloading load increased,the total settlement days and settlement value of the ecological bag gradually decreased.Based on the hyperbolic method,the final settlement of the ecological bag was predicted,and the fitting degree gradually increased with the increase of the load.This indicates that the hyperbolic model is suitable for predicting the settlement of ecological bag riverbank slopes.(4)Based on the hyperbolic method,the settlement of the eco-bag was predicted,and the predicted data was in good agreement with the actual values.The hyperbolic model can be applied to predict the settlement of the eco-bag.Meanwhile,a settlement calculation formula for the structural surface layer of the eco-bag was proposed,and the settlement of the surface layer with different compaction degrees was calculated.The results showed that the preloading load had a significant effect on the settlement of the surface layer,and the settlement decreased linearly with the increase of compaction degree.When the preloading load was 1MPa,the settlement of the eco-bag decreased by 67.6% compared with the settlement without preloading.(5)Based on the secondary development of Abaqus finite element software,the consolidation settlement of ecological bags under different compaction degrees was simulated... |
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