Support Optimization of Open TBM Tunneling in Luohe Formation Sandstone by CT Test and Numerical Simulation

Author:

Kang Xin12,Li Anyun3,Xie Xiongyao12,Zhang Kai4,Zhou Biao12,Kang Yuanfeng3

Affiliation:

1. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China

2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China

3. Urban Rail Transit Engineering Co., Ltd., China Railway 15th Bureau Group, Yangzhou 225001, China

4. Railway Third Survey and Design Institute Group Co., Ltd., Tianjin 300142, China

Abstract

As underground engineering extends into the western and deeper regions of China, more and more Luohe Formation sandstone layers will be encountered, which have weak cementation and high water content. It is a significant challenge to apply the open TBM, and the support system is crucial in determining whether TBM can excavate quickly and safely. Therefore, in order to optimize the support scheme, this paper analyzes the pore structure and porosity through CT scanning, the results indicate that the volume percentage of pores ≥34 μm is 2.3% and 1.5%, respectively, the large pore apertures are predominant, the surrounding rock has strong permeability, and there is a high risk of rock burst and roof collapse accidents, hence requiring reinforced support measures. On this basis, numerical simulations were conducted to evaluate the support effectiveness. The results show that replacing the “bolt + mesh” with a “bolt + cable + mesh + steel belt”, and replacing the top three bolts with 7.3 m anchor cables, can better control the deformation and provide sufficient thrust force for the TBM, ensuring excavation speed. After the implementation of this scheme at the Kekegai coal mine in Shaanxi, China, the TBM excavation speed increased by 70%, from the previous 10 m/day to 17 m/d, significantly reducing the project duration and construction costs.

Funder

the Science and Technology Project of China Railway 15th Bureau Group Co., LTD.

Publisher

MDPI AG

Subject

Fluid Flow and Transfer Processes,Computer Science Applications,Process Chemistry and Technology,General Engineering,Instrumentation,General Materials Science

Reference22 articles.

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2. Tian, L., Liu, W., Zhang, J., and Gao, H. (2023). Cataclastic Characteristics and Formation Mechanism of Dolomite Rock Mass in Yunnan, China. Appl. Sci., 13.

3. Physical and mechanical properties and failure mode of Luohe Formation sandstone after thawing;Ren;Coal Eng.,2021

4. Vertical hydrogeological characteristics of Luohe aquifer and its significance of water-preserved coal mining;Li;J. China Coal Soc.,2019

5. Deng, H., Tian, G., Yu, S., Jiang, Z., Zhong, Z., and Zhang, Y. (2020). Research on Strength Prediction Model of Sand-like Material Based on Nuclear Magnetic Resonance and Fractal Theory. Appl. Sci., 10.

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. A new stage control device for open TBM tunnel lining support in water-rich weakly cemented soft rock;International Journal of Rock Mechanics and Mining Sciences;2024-07

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