Mountain Tunnel Lining Stress Mechanism And Structure Design In High Pressure And Rich Water Stratum

To the tunnel structure security water pressure which was one of the main loads in the high water pressure formation has great significance. Practice proves that Water plugging and limited drainage and Whole-row of waterproof drainage design principles have much adverse impact. It is according to the groundwater environmental balance theory that Controlled-drainage not only can avoid the groundwater environment destruction for waterproof and drainage principle of Whole-row, and can reduce the investment risk and time limit for waterproof and drainage principle of Water plugging and limited drainage. However, people knew little about under the condition of high pressure tunnel stress mechanism.Based on the analysis of groundwater seepage theory, the finite element method is adopted to establish the tunnel seepage numerical model under the condition of the Controlled-drainage and tunnel drainage is considered and influence of tunnel water pressure related factors are studied, won a series of meaningful results:①To elucidate the tunnel grouting circle, coefficient of permeability, water pressure and surrounding rock in relation to each other, the selection of design parameters of grouting design has guiding significance.②Analysis and reveal the tunnel grouting circle and initial support thickness in bear the external water pressure of interaction, is conducive to choose the design of initial support parameters, optimization of design parameters of grouting.③Through analysis the relationship of drainage capacity, which was behind the lining under the condition of "Controlled-drainage", external water pressure and pressure of surrounding rock, reveals the distribution of external water pressure on lining and Put forward the lining external water pressure load calculation methods, and in the tunnel project on been successfully applied in and verified.The research in this paper is proof that the tunnel drainage system in high pressure formation to water pressure has control function under the condition of Controlled-drainage. It is suggested that In the process of the same type of tunnel design, construction, operation Improve the quality of the tunnel drainage system and ensure unobstructed.