Research Of Cure Technology For Water Inflow Into Extra-Long Deep Tunnels On Construction

"Much,long, huge, deep" will be the general develop trend of extra-long tunnel(cavity).Along with the longth and deepth of tunnel(cavity) increased,the forecast and disposal of geological natural calamity become the biggest obstacle in reconnaissance, design and construction deep and extra-long tunnel (cavity) in future.One of the biggest geological calamity in the construction of deep and extra-long tunnel(cavity) is water inflow.Water inflow in tunnel's construction not only decrease the stability of wall rock,but also bring many bad affections to the tunnel' s construction.Specialy in the case of a great deal of high pressure water inflow exists in construction, it will make fetel accidents usually.On the other hand, adopting much drainage to solve the ground water calamity problom would bring the environment problom at section that the tunnel go through.This paper summarized the dewatering technique and succeed experiments in domestic and overseas construction of deep and long tunnel(cavity),on this base,this paper gave an analysis and demonstration to the dewatering technique in tunnel construction and the plan that may be adopted in the deep long tunnel of Jinping Grade 2 Water Power Station.There are four water tunnels in Jinping Grade 2 Water Power Station,the excavation radius is 12m, the radius after lining is 11m,the average length is 16.60km.The buried deepth is biggish,the common deepth is 1500-2000m,and the biggest one is 2525m.How to construct safely and protect the environment upon the tunnel is the difficulty in dewatering technique in water tunnel construction.it' s the key to water tunnel construction.The paper research the section that exists water inflow and its characteristic on the base of the hydrological and geological characterof water tunnel, and put forward to the principle--exploring beforegrubbing, giving priority to protection, protection linking with drainage---in deep long water tunnel's construction in Jinping Grade 2 Water Power Station. During the construction,it based itself upon...