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Model test study on large deformation mechanism of thin-bedded metamorphic sandstone tunnel

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Abstract

During the construction of the Changning tunnel, large deformation of surrounding rock was induced frequently due to the effects of geological conditions such as weak and broken rock mass, and high ground stress. In this paper, the deformation and failure mechanism were studied using field investigation, rock structure analysis, and physical model test. The surrounding rock is weathered metamorphic sandstone. The SEM observation of rock mass shows that the schistosity structure is obvious, and the structure of rock mass is relatively loose with well-developed pores. The content of clay minerals in the rock is high, and the main components are illite and chlorite. The model test results show that under the original rock stress, the stress and deformation of surrounding rock during excavation showed obvious asymmetry, and the stress of the 3D printed steel arch model gradually changed from tensile stress to compressive stress. In the process of overload, the surrounding rock has obvious slip and spalling, and the spalling mainly occurred in the shear sliding part of the stratum. With the more serious deformation of the steel arch, the stress concentration was obvious. The abnormal temperature area of the surrounding rock gradually expanded with the process of excavation and overload, and the temperature of the rock layer where shear sliding occurs was high. The research results show that the compression bending and shear sliding of rock strata caused by the rock structure and tectonic stress are the main reasons for the large deformation of the Changning tunnel, and reducing the slip deformation of the rock stratum is the key to controlling the deformation of the surrounding rock.

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Funding

This work was supported by the National Natural Science Foundation of China (Grant No. 41941018).

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Authors and Affiliations

  1. State Key Laboratory for Geomechanics & Deep Underground Engineering, Beijing, 100083, China

    Bo Zhang, Xiaoming Sun & Zhigang Tao

  2. School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing, 100083, China

    Bo Zhang

  3. School of Civil Engineering, Shaoxing University, Shaoxing, 312000, China

    Pengfei Guo

  4. Guanxi Road and Bridge Engineering Group Co., Ltd., 530200, Nanning, China

    Kang Yang

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  1. Bo Zhang
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  2. Xiaoming Sun
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  3. Kang Yang
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  4. Pengfei Guo
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  5. Zhigang Tao
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Correspondence to Zhigang Tao.

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Zhang, B., Sun, X., Yang, K. et al. Model test study on large deformation mechanism of thin-bedded metamorphic sandstone tunnel. Bull Eng Geol Environ 81, 436 (2022). https://doi.org/10.1007/s10064-022-02937-z

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  • DOI: https://doi.org/10.1007/s10064-022-02937-z

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