This paper analyzes the function of coverage water on film, effective consolidation depth, sealing curtain technique, as well as the influence of underlying strong permeable stratum of vacuum preloading method through indoor test and engineering practice, so as to provide a reference for corresponding p.

Based on the field experiment,the effects of cultivation technique of water collection by mulching upon the soil water content,yield of flue-cured tobacco field and WUE were studied.

We have obtained the bound of the cover pebbling number of connected graph of order n,which is the best possible.