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| The influence of different excavation methods on the stability of surrounding rock of tunnel in coal-bearing strata |
| ZUO Yujun, WAN Ruzhen, SUN Wenjibin, LIU Hao, LIN Jianyun, LOU Yili
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| Mining School, Guizhou University, Guiyang 550025, Guizhou, China |
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Abstract Aiming at the common problems of tunnel excavation in coal-bearing strata in road construction at present, taking Taoziya Tunnel of Zhengxi Expressway as an example, the whole construction process of three construction methods for coal-bearing strata excavation was simulated. The stability of the surrounding rock and the supporting structure were analyzed, and the variation rules of stress, displacement and other parameters during the construction process were obtained and the construction suggestions were put forward. The results showed that the excavation method and temporary structure affected the stress distribution and deformation of surrounding rock and tunnel structure: for the step method, the temporary structure might be appropriately arranged to control the deformation in the lower half section; at the interface of the inclined rock strata, the CRD method and the core soil method should adjust the surrounding rock of each section to stabilize the rear surrounding rock according to the working conditions, and control the surrounding rock deformation during excavation. According to the above results, the construction scheme and supporting design could be optimized, which has reference significance for similar tunnel construction.
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Received: 03 September 2019
Published: 09 March 2020
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