Research On The Infiltration And Stability Of The High-pressure Hydraulic Tunnel

The seepage and stress analysis of high pressure tunnel is a subject which contains hydraulics and rock mechanics. Looking at the development of the analysis of rock permeability, various methods are not really satisfactory solution to the practical problems. Identification of the theoretical model, constitutive model, parameters, simulation methods are specific to be done further in-depth study. With large-scale pumped-storage power station and the hydropower construction development to the mountain areas, the head of water tunnel increasing. How to solve the high-pressure hydraulic rock tunnel seepage and stability problems, ensure that the tunnel can be long-term, security, stability operations and how to meet the design and construction economic and reasonable are the problems which geotechnical engineering concerned and urgent need to solve.In this paper, with "The F15 fault zone of water pressure test of HeiMiFeng Storage Power Station high-pressure tube of bifurcation," the process of high-pressure hydraulic tunnel infiltration and stress fields of numerical simulation has been studied detailed. First, in the high-pressure, the seepage field of the fault of the 1st test hole has been studied, and then drawn on the 1st test hole water pressure and flow changes with time curve in the fast, medium and slow water pressure conditions and 2#, 5# pressure gauge infiltration pressure with time curve in the slow loading, at last the numerical simulation results and experimental results are compared and analyzed. On the basis of 1# test hole numerical simulation, establishing fault of diversion tunnel grid model and making the numerical simulation on the seepage field and stress field of tunnel, we obtained seepage water pressure and x direction and z direction of the stress cloud which was designed in accordance with the hydraulic operation and maintenance circumstances. After the analyses to the simulation results, we established viable options about tunnel operation and maintenance.With the support of the computer hardware continuously updated, numerical simulation technology development rapidly, as assistant tool of the large-scale and macro-known qualitative analysis and dealing with of the local known issues, numerical simulation technology provide valuable information for the engineers and for the safe,reasonable design and construction provides a theoretical basis.