Study on anti-scouring and vegetation fitness of green-growing concrete slope protection based on orthogonal test method

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Abstract In this study, the orthogonal test method was used to test the effects of three factors, namely, the thickness of green-growing concrete, the thickness of soil cover and the slope ratio, on the growth of Cynodon dactylon and the amount of soil washout, and the height of grass growth, the length of root system, the total amount of roots per unit area, and the degree of cover were taken as the indicators of the growth test. The three influencing factors were determined by ANOVA to determine the order and significant level of the three factors, and the optimal combination of the three factors was screened and applied experimentally in the actual project. The test results show that: the degree of cover is the key element for evaluating the growth of vegetation; the thickness of green-growing concrete and slope gradient are the most significant factors affecting the growth of Cynodon dactylon and the amount of soil scour, respectively; when the thickness of green-growing concrete is 10cm, the thickness of mulch is 9cm, and the slope ratio is 1:3, the performance of green-growing concrete berms is optimal. Through the engineering demonstration application, the average scour depth of the green-growing concrete berm for 2 years is 0.91cm, and the vegetation growth condition is good, which can meet the requirements of slope protection, soil and water conservation and ecological restoration.