The collapse of terracebank in South Shaanxi province

especially terracing on the slope with distribution of yellow cinnamon soil is serious. Generally

about 30%~40% percent of the terrace conseructed in the year will collapse or slide in the rainyseason in the next year. In some of places trial methods of conseructing terracebank such as retainingplank

adding sand to clay soil

woven plastic bags have been tested and proved to be little effect. The reason which terracebank is difficult to stabilize are as follows: 1. Higher clay ontents in soil and lower water drainge capacity; 2.Rich rainfall and high rainfall intensity; 3. Steep slope gradient，4. No vegetation measures to protect terracebank even distroing the ridge of terraced field;5. Poor construction quality of terracebank i 6. Imperfect water drainge system.It has been tetified by practie that no single measure can roughly solve the problem of collapse of terracebank in South Shaanxi province

and comprehensive harnessment is essential. It is an efficient way of controlling collapse of terracebank to establish comprehensive controlling system which focuses on water drainge and terracebank steadiness

combines slope control engineering with vegetation

combines harnessment with exploitation.