基于可靠度理论研究导流洞涌水概率及敏感性.

At present, the diversion tunnel is often used in the early stage of hydropower station construction, but the problem of water inrush often occurs in the process of excavation, so the determination and evaluation of the probability of water inrush has become the primary problem solved by geologists in recent years. For diversion tunnel water gushing limit characteristics, with the theory of reliability, determine its reliability limit state equation, and based on field test and probability statistics method, the equation of rock permeability coefficient K, diversion tunnel length L, the phreatic surface to the diversion tunnel bottom head height H, drain the water depth h, diversion tunnel radius R basic variables such as average, variation coefficient and the changing rule of the reliability index were studied. Diversion tunnel water gushing reliability index calculation model was established and at the same time it analyzed the reliability sensitivity of the basic variables. It obtains through the analysis that the reliability index of water inrush is the highest sensitivity to the permeability coefficient K of diversion tunnel rock mass, then is the phreatic surface to the aquifer water head height of the base plate, diversion tunnel length and radius of influence and the sensitivity to the drainage ditch water depth is the minimum. [ABSTRACT FROM AUTHOR]