Experimental Study And Simulation On Early Stability Of Borrowed Soil In Ecological Slope Protection

Resource extractionand engineering construction,for instance,quarry mining,highway railway and water conservancy etc,are often associated with the rock mass excavation landfill,which produce a large number of bare artificial slope,the serious destruction of original environment and ecological imbalance.The exposed artificial slope not only affects the appearance of beauty,but also has the hidden dangers of soil erosion and landslides and debris flow.There are two kinds of techniques for the treatment of artificial slope and some natural slopes: the traditional engineering slope protection technology and the emerging ecological slope technology.The traditional engineering slope protection technology uses stone sand and cement as the main materials,which erosion control effect is obvious on early slope instability,but it takes a long period for concrete slope surface weathering,resulting in the reduced intensity and repeated surface damage and it is not conducive to ecological restoration.The ecological slope protection technology is an integrated technology combined engineering mechanics,soil science,ecology botany and soil environment of slope structure,which can satisfy the growth of plants,and its root reinforcement effect can build the interaction between soil and rock surface of slope protection and greatly reduce the slope surface erosion.This technology can not only maintain the stability of the slope surface,but also restore the damaged ecological environment.In recent years,TBS vegetation slope protection afforestation technology(thick layer base material vegetation slope protection technology)has been widely applied,but in the process of the engineering practice,with the borrowed soil occurs instable phenomenon,even falls off.Stability of borrowed soil,especially one the early stage(it refers plants is under growing,the root has no reinforcement effect)is the key to the success of slope protection So in the early stage stability of borrowed is of great significance to carry out the theoretical and experimental research.Considering the factors affecting the stability of early stage borrowed soil,the main research content and research process are determined as following:According to the advantages and disadvantages of extensive laboratory tests and numerical simulations on borrowed soil slope,finite element strength subtraction was used for numerical simulation of borrowed soil slope stability.The test stand was developed for slope stability indoor tests and designed especially for ecological slope protection.The test stand is different from the existing indoor test facilitiesor the stability of borrowed soil,which includes slope adjustment system,spray seeding system and signal acquisition system.These features make the test stand comprehensive consider various factors to analyze the slope stability of borrowed soil.The results are greatly close to the actual working condition.The physical simulation experiment was carried out using the slope stability test stand with various composition and the slope angle of borrowed soil.The best ratio of the slope stability of borrowedsoil under the condition of laboratory its displacement plot versus increasing angles were obtained.The finite element strength subtractionof the ANSYS parametric design language,was applied to complie the programe for the slope stability analysis of borrowed soil.The numerical simulation results are basically consistent with the experimental results.The research content of this paper is mainly composed by the following aspects:(1)An experimental test stand for the stability is developed with an independent intellectual property.The experiment platform can study the stability of the soil by changing the slope,temperature and humidity.Experimental data analysis shows that the test stand has been tested and studied.Use of temperature and humidity sensor,displacement sensor,and displacement measurement of environmental soil temperature,temperature,humidity,soil slope of replace the displacement curve and relationships change,slope angle of replace the biggest influence of instability.(2)Optimized the base material matching ratioThe shear strength of each base material is obtained by the indoor shear test,and the optimized base material ratio of the soil content with 40% and 50% is calculated by using the orthogonal test table.(3)The slope range of the stability corresponding to base material is obtainedBy using testing experiment,the humidity was 55%,the temperature of 30 °,the test cycle for 7 days under the condition of experiment,five kinds of base material(i.e.,8,13,6,2,14 base material)range of critical slope,the scope of its corresponding critical slope is 60°-65°?60°-65°?55°-60°?45°-50°?30°-35°(4)The numerical simulation results agree with the experimental results.Numerical simulation analysis based on ANSYS APDL language,8,13,6,2,14 base material is used to numerically simulate research,and the corresponding critical slope value of the base material were obtained : 62.8°?63.5°?56.2°?50.3°?32.8°.The critical slope value of the base material is obtained by the numerical simulation.The numerical simulation results are consistent with the experimental results.The innovation points of this article:(1)A test stand for the stability of the soil slope with independent intellectual property rights is developed.Its main functions are:(1)Theconstruction of the slope is mainly rock.(2)The slope of the slope can be adjusted;(3)It can realize the spraying of the soil(substrate).(4)The monitoring system USES ultrasonic wave can measure the slope of the slope,the temperature and humidity of the soil at any tim(2)By analyzing the main components of the soil and using the orthogonal test method,the configuration scheme of the soil base material was developed,and the shear strength of each matched base material was measured by the shear test of the substrate.Base material shear strength have been measured using the value calculated in orthogonal experiment table for two kinds of optimal ratio of base material,and get 4 class classifying 18 kinds of base material base material,selection of representative the base material of indoor experiment table test and numerical simulation analysis.