Abstract
Based on the geological conditions of the fully weathered sandstone stratum in the expressway of the mountainous area, the Huizhou-Qingyuan section of the Yuzhan Expressway is used to analyze the mechanical parameters and creep characteristics of the surrounding rock of the tunnel through the indoor model test. It is concluded that: 1) The uniaxial compression deformation test measured the structural parameters of the fully weathered sandstone stratum structure, and obtained that the elastic modulus and internal friction angle φ of the fully weathered sandstone was 14.20°, and the cohesion c was 0.343Mpa. 2) The failure mode of fully weathered sandstone specimens was obtained by triaxial creep test. The creep curves of different weathered loads were analyzed and the Xiyuan rheological model was established. 3) The creep data was analyzed by MATLAB software, and the surrounding rock parameters under different surrounding rock were obtained.
Highlights
With the number of highways connecting cities has been increasing, and the engineering problems and difficulties is increasing exponentially
Liu Mengbo et al combined with the experimental data of soft clay in Shanghai area, using the creep model coupled with the time hardening rule and Druker-Prager yield criterion, using numerical simulation method to analyze the variation of soft soil creep characteristics and force with time [5]
The mechanical parameters of the fully weathered sandstone stratum are measured by laboratory
Summary
With the number of highways connecting cities has been increasing, and the engineering problems and difficulties is increasing exponentially. In Guangzhou, the rainwater is rich, which causes a lot of difficulties construction. The analysis of the mechanical and creep properties of the surrounding rock of the fully weathered sandstone tunnel is of great significance for selecting appropriate excavation methods, supporting parameters and selecting support timing and reinforcement measures [1,2,3]. The Creep Mechanics Parameters of the geological conditions of the carbonaceous slate were obtained by inversion of the field monitoring data through BP neural network [4]. The mechanical parameters of the fully weathered sandstone stratum are measured by laboratory
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