Research And Development Of Ecological Concrete Composite Planting Blanket And Numerical Simulation Of Slope Protection

The construction of highways inevitably results in the excavation of a large number of hills and the exposure of the surface layer of the rock and soil on the slopes,which has a serious impact on soil and water conservation and ecological balance.In order to complete the task of slope protection and ecological conservation,highway slopes need to give priority to plant protection,in which there are technical problems such as "difficult to protect,difficult to survive,easy to scour" in the plant protection of high and steep slopes,if the protection is not appropriate,it will cause scour damage,soil erosion,or induce geological disasters such as slope landslides,resulting in huge economic losses and This can cause huge economic losses and casualties.Therefore,it is necessary to research new slope protection technology for high and steep slopes of highways.In this paper,a three-dimensional spacer fabric and sulphate aluminate cement are used as the main materials to develop an ecological concrete composite vegetation blanket with the pore environment,PH value and certain strength required for plant growth.The main research elements include:(1)42.5 grade sulphate aluminate cement was selected as the research object,modified for its properties,and the ratio of the ecological concrete cementing material was optimised and studied.In view of the problem that the alkalinity of concrete ecological slope protection is high and cannot meet the requirements of vegetation,and taking into account the compressive strength of concrete,different admixtures were selected,and the trial mixing test of cementitious materials was carried out and the corresponding performance was measured.The results show that it is feasible to use sulphate of alumina cement as the main part of the cementitious material;the addition of mineral admixtures to the cementitious material can reduce the alkalinity,but the effect is not very obvious;gypsum has a higher alkali control ability compared to other mineral admixtures and the compressive strength of the concrete obtained also reaches a more desirable situation.The test concluded that sulphate aluminate cement mixed with 5% silica fume,20% gypsum and 15% mineral powder can make the alkalinity and compressive strength of concrete reach a more ideal condition.(2)Using modified sulphate aluminate cement as the cementitious material and fine aggregate as the main skeleton,the aim was to investigate an eco-concrete suitable for three-dimensional spacer fabrics.The test mixes for the eco-concrete were designed by the orthogonal test method using a five-factor,three-level orthogonal design table,where the last column is a blank group.Three levels of variation in the four factors of target porosity,water to ash ratio,organic matter admixture and ash to bone ratio were considered separately in this section of the study.The test results were analysed and compared to explore the major and minor factors affecting the strength and PH of the ecological concrete.The results of the orthogonal tests were analysed by anova to obtain the optimum mix ratio under the combination of the above four factors.(3)A three-dimensional spacer fabric was used as the framework of the blanket and ecological concrete was used as the filling material to prepare a planting blanket that could be cured by watering.In this paper,the interfacial shear properties and tensile properties of the vegetation blanket were tested and analysed.The results show that the vegetation blanket has a high tensile strength of 3.87 MPa and a friction angle of 27.7° with the sandy soil.(4)Simulation calculations were carried out with the help of FLAC3 D software,and the homogeneous and strongly weathered rocky slope was used as the research object.Simulations were carried out in different slope angles,support modes,rock anchor spacing,vegetation types and reinforcement layer thicknesses,etc.The corresponding safety coefficients of slope stability were obtained,and their intrinsic laws were analysed,and some guiding conclusions were drawn,which can be used as reference for engineering practice.