Comparative study on tunnel boring machine and drilling-blasting methods for tunnels based on FLAC3D

Aiwu Cao; Jiayao Wu; Weijiang Chu; Dongfeng Wang; Yongjin Cheng

doi:10.1117/12.2681818

16 June 2023 Comparative study on tunnel boring machine and drilling-blasting methods for tunnels based on FLAC^3D

Aiwu Cao, Jiayao Wu, Weijiang Chu, Dongfeng Wang, Yongjin Cheng

Proceedings Volume 12639, Third International Conference on Mechanical Design and Simulation (MDS 2023); 1263939 (2023) https://doi.org/10.1117/12.2681818
Event: Third International Conference on Mechanical Design and Simulation (MDS 2023), 2023, Xi'an, China

Abstract

Excavation damage zone (EDZ) has a great influence on the stability and support design for tunnels. To better describe the difference of EDZ in hard rock caused by tunnel boring machine (TBM) and drilling-blasting (D&B) method, the scope and degree of EDZ were considered. The scope of EDZ was determined by the test results from similar engineering. The degree of EDZ was determined by the Hoek-Brown criteria and the EDZ analysis of underground caverns. Combined with Ninghai pumped storage power station, FLAC3D was used to analyze the difference. For an access tunnel with a diameter of 9.80m, the displacement with the TBM method is about 65-80 % compared with the D&B method, and the depth of the plastic zone is only half. The analysis results are also consistent with field test results. Which means the analysis method is reliable and effective.

Citation Download Citation

Aiwu Cao, Jiayao Wu, Weijiang Chu, Dongfeng Wang, and Yongjin Cheng "Comparative study on tunnel boring machine and drilling-blasting methods for tunnels based on FLAC^3D", Proc. SPIE 12639, Third International Conference on Mechanical Design and Simulation (MDS 2023), 1263939 (16 June 2023); https://doi.org/10.1117/12.2681818

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