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ORIGINAL RESEARCH article

Front. Earth Sci.
Sec. Solid Earth Geophysics
Volume 12 - 2024 | doi: 10.3389/feart.2024.1501420
This article is part of the Research Topic Advanced Materials and Technologies for Sustainable Development of Underground Resources View all 15 articles

Pressure Relief for Drilling (Trenching) and Support Technology in Deep Soft Rock Tunnels

Provisionally accepted
Ling Yang Ling Yang 1*Ying Xu Ying Xu 2
  • 1 Anhui Jiangnan Blasting Projectlimited company, xuancheng, China
  • 2 China University of Mining and Technology, Xuzhou, Jiangsu Province, China

The final, formatted version of the article will be published soon.

    Controlling surrounding rock stability in deep soft rock tunnels solely by increasing the support strength is challenging. The key areas where the surrounding rock of a roadway is prone to "instability" should be treated with comprehensive measures, such as drilling to relieve pressure, grouting of the surrounding rock, floor trenching technology, and secondary support, to achieve overall stability of the roadway surrounding rock. In this paper, based on a typical straight wall semi-circular arch roadway project in the Huaibei mining area of Anhui Province, mechanical parameters, such as cohesion, internal friction angle, Poisson's ratio, and elastic modulus of the surrounding rock, were measured. Displacement stress distribution in surrounding roadway rock were simulated and analyzed using FLAC 3D, and the key parts of the surrounding rock prone to instability under the original roadway support conditions were determined. A suitable arrangement and parameters of the borehole pressure relief in the side roadway, floor grouting, floor trenching, and floor bolt secondary support were selected. Engineering measurements indicated that the engineering techniques were successful. It provided a significant reference for the comprehensive management and treatment of the surrounding rock stability in deep soft rock roadway on a global scale.

    Keywords: Deep soft rock roadway, numerical simulation, Displacement stress distribution, Drilling pressure relief, Floor grouting, Floor trenching, secondary support of floor bolts

    Received: 17 Oct 2024; Accepted: 28 Nov 2024.

    Copyright: © 2024 Yang and Xu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Ling Yang, Anhui Jiangnan Blasting Projectlimited company, xuancheng, China

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