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| Effect of the permeability dynamic evolution of saturated rock on the stability of diversion tunnels |
| WU Guojun1，CHEN Weizhong1，2，TAN Xianjun1，DAI Yonghao1 |
| (1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. Research Center of Geotechnical and Structural Engineering，Shandong University，Jinan，Shandong 250061，China) |
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Abstract Hydro-mechanical coupling analysis has been a focus and difficulty in the study on the stability of deep buried diversion tunnels in hydropower station. Based on the effective stress principle of porous media，an improved model regarding the dynamic evolution of porosity and permeability of saturated rock with respect to volumetric strain is derived，which can realize the real hydro-mechanical coupling analysis in the process of failure of surrounding rock. Being introduced into the code ABAQUS through the secondary development of user-defined subroutines，the evolution model is applied to a large deep buried diversion tunnel. The calculation results by the proposed evolution model are compared with field monitoring data and traditional hydro- mechanical coupling calculation results in terms of the permeability distribution and displacement in the surrounding rock，and it is shown that the proposed model is more precise and more practical. In order to study the influence of filling and draining water on the stability of the diversion tunnel during operation period，a numerical simulation with 5 calculation steps is conducted. Compared the traditional case taking the permeability as an invariant，for the surrounding rock，the pore water pressure after the periods of filling and draining water decreases more rapidly from the border to deep ground，the displacement at the roof is much larger by up to 100% and larger by 180% to 200% at the floor，and the scope and extent of the plastic zone are far greater. For the lining of the tunnel，the tensile stress in the linings with a constant permeability increases by approximately 11% from filling water to draining water while the calculation result by the proposed evolution model increases by up to 35% with a larger value，which should be paid more attention.
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2020, Vol. 39 
