The Computation Research Of Rock Permeability Of Water And Tunnel Surge Water Amount

Tunnel is an important part of communication lines. Surge water amount of tunnel is the main mark of evaluating the complex degree of tunnel water filling condition, and the major basis of drainage design. Pre-estimating tunnel surge water amount is very important to the correct design of tunnel. Usual methods of computing tunnel surge water amount include: theoretical formula method, numerical method and empirical equation method. With the rapid development of national economy and massive construction of submarine tunnel, the geology disaster of surge water during construction and operation of tunnel has become an important problem considered during the reconnaissance design phase. And the pre-estimating of surge water zone and surge water amount is the key to this problem. At the same time, this problem is a grave research topic of domestic and foreign scholar and expert.The surge water seriously affects the stability of adjacent rock and the safety of tunnel. So we must grasp and understand the tunnel line condition of groundwater distribution, water height, water amount, supply and drainage, and pre-estimate the underground surge water of particular geology zone, and make technical measures. The pre-estimation of surge water must penetrate the whole process from reconnaissance design to construction. During the construction phase, continuously inverse correct the computation result of design phase, to perfect the accuracy rate of tunnel pre-estimation increase the surge water prediction effect of front palm plane, and serve the construction.Quasi-constructed Xiamen East Passage Submarine Tunnel Construction, NE50°in direction and about 5.9 kilometers in the whole length with about 4.2 kilometers' sea area include, locates between the Wutong Village in Huli Region of northeast end of Xiamen Island and Xibin Village in Tong'an Region. East Passage Construction is the important element of Xiamen highway diaphysis networks planning, its built will play an important role in the economic development of Xiamen, especially the east part of Xiamen. Meanwhile, Xiamen Xiamen East Passage Submarine Tunnel is the first submarine tunnel of Chinaplanned to construct. For this construction is in the seabed, the supply water of pervious rock is infinite. So to check out the hydrogeologic condition of tunnel engineering area and to research the excavation surge water amount, is the grave engineering geological problem to be solved during the construction.According to the existing hydrogeologic data and field test result, study the equivalence of permeability coefficient of fracture dielectric rock, then check out the permeability of engineering rock, fracture(structural plane),and deep and thick weathering(groove) belt,computer the excavation surge water amount by formula method and numerical method, and then evaluate the seepage damage, to provide theoretical basis for tunnel construction.