Research On The Ecological Restoration And Stability For Pisha Sandstone Slope

The perfusion planting coil technology is a new type of flexible ecological slope protection technology,which reconcile the efficiency of protection and effectiveness of planting.It can be used for protection and greening of soil or even rock slopes such as highways and rivers.Aiming at the special lithological characteristics of Pisha sandstone,the designed vegetation coil layers were anchored and fixed on the slope surface,and then injects seeds and special materials into the vegetation coils through special mechanical pressure.Herein,he slope surface forms a stable and long-term.The base layer of plant growth achieves the purpose of improving the ecological environment of the slope,and gradually realizes the harmony and unity of slope protection and landscape benefits.Focusing on the ecological slope protection technology of arsenic rock,the following efforts were carried out in current study:(1)The effects of rice husk charcoal,water retaining agent,vermiculite and organic fertilizer on soil hardness,plant germination rate,p H change,water stable aggregates,total porosity were experimentally investigated via single factor test method.It is concluded that the base material has a significant influence on the effect of ecological slope protection.After analyzing the function of the substrate,it is determined that the components of the plant substrate are: Pisha sandstone,water retention agent,rice husk charcoal,vermiculite,plant seeds,organic fertilizer,etc.The comprehensive performance of the benchmark base material obtained from the test is relatively well.(2)The orthogonal method was used to investigate the influence of humus soil,vermiculite,and rice husk charcoal,water-retaining agent on soil hardness,p H value,germination rate,and stable infiltration.The correlation between all norm and the four main influencing factors is compared,and the correlation between each factor is used to obtain an optimized formula,which effectively improves the average germination rate of the plant.(3)Based on the theory of strength reduction,the universal finite element software ABAQUS was used to simulate the slope stability coefficient before and after the rainfall on the slope protection with planting coiled material.During the perfusion type vegetation roll material is covered,the changes in the the slope stability has the rainfall process for analyzed.This change can indicate to a certain extent in the degree change of the vegetation coil to the Pisha sandstone slope.(4)Based on the optimized ratio of indoor experiments,a demonstration project for the application of on-site slope ecological restoration supporting technology was carried out;the construction and monitoring schemes of high and low slopes and road slopes dominated by arsenic sandstone were systematically summarized.The results show that the proposed ecological restoration technical scheme can effectively solve the difficult problems of high and steep slope construction.The modification of plant base materials and the combination of anti-corrosion and seepage control composite materials can more effectively achieve the goal of slope consolidation and greening,and at the same time can reduce the risk of soil erosion in the long term.