Study On Bio-Slope-Engineering Technology For Rock Slope In Zhan-Kun Railway

Scientific research and field experiment on rock slope planting protection technology have been developed in many newly-built trunk railways in recent years because of ecologic environment protection. Zhan-kun railway being constructed is locating in Yun-gui plateau monsoon climate region, where is high altitude, small rainfall, large evaporating capacity and windy winter and spring. To apply widely bio-slope-engineering technology in rock slope in Yun-gui plateau railway construction, existing bio-slope-engineering technology is mended on the base of geotechnical and climate features of rock slope in Zhan-kun railway and successful experiences in existence.Taking synthetically into account geographic region, climate region, field investigation, cultivation experiment and field experiment, vegetational types for rock slope planting in Yunnan monsoon climate region are selected. Technology of spraying mixed grass seeds and transplanting shrub are put forward to found steady diverse plant community in rock slope. It is suggested that Bermuda grass or bermuda grass and korean lovegrass and green bristlegrass is used as main species, whereas red clover and india lovegrass and calliopsis and maidenhair are used as accessorial species to improve the plant community diversity and its landscape.Based on the effects of content of soil, organic matter, water absorbent and bonding agent on physical chemical characteristic and stability of base material, optimal compounding ratio of base material applying to Zhan-kun railway is given by compounding ratio experiments.According to rock types in Zhan-kun railway, classification method of bio-slope-engineering is given. Packaged technology of bio-slope-engineering for Zhan-kun railway rock slope, including hydro-seeding, hydro-seeding in herringbone intercept water framework, three-dimensional vegetation netting and organic basal material spraying and shrub transplanting, are put forward on the base of rock weathering and slope height and its stability. Then, applicability of packaged technology and capability of base material are studied by several field experiments in Zhan-kun railway, which validates the rationality of vegetational types and base material in the view of engineering test.