Triaxial unloading effects on pre-holed sandstone energy characteristics and damage evolution mechanism: Comparative analysis of diffrent borehole bottom locations

IF 3.3 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment Pub Date : 2025-04-23 DOI:10.1016/j.gete.2025.100676

Wenpu Li , Yaoguang Chen , Guorui Feng , Xingxing Xie , Minda Zhang , Zhiyuan Tian , Huan Zhang , Tao Wang , Ruiqing Hao , Yun Bai

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引用次数: 0

Abstract

Studying the failure mechanism of roof sandstone under the influence of drilling unloading and mining disturbance is crucial for preventing roof disasters and achieving safe and efficient mining in coal mines. Therefore, this research conducted unloading tests on sandstone with different borehole bottom location under varying radial stress gradients. First, the deformation and acoustic emission (AE) characteristics of sandstone during unloading were analyzed for different borehole bottom location. Next, the plastic and energy characteristics of the sandstone were examined and explained based on statistical damage theory. Finally, the damage mechanisms of sandstone under drilling pressure relief and support in the goaf with different borehole bottom location were discussed. The results indicate that different radial stress gradients have a detrimental effect on the mechanical properties of sandstone, and the depth of the hole exhibits a nonlinear degradation effect on these properties. By employing a damage constitutive model, energy evolution and acoustic emission characteristics validated the nonlinear degradation related to the borehole bottom location and effectively reflected the internal crack propagation in the rock. Appropriate borehole bottom location and support measures can effectively prevent roof fracturing while maintaining economic efficiency. This study aims to effectively mitigate damage to the roof under the influence of drilling unloading and mining disturbance, ensuring safe and efficient mining operations.

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三轴卸荷对预孔砂岩能量特征及损伤演化机制的影响：不同井底位置对比分析

研究钻孔卸荷和开采扰动作用下顶板砂岩的破坏机理，对于预防顶板灾害，实现煤矿安全高效开采至关重要。因此，本研究在不同径向应力梯度下，对不同井底位置的砂岩进行了卸载试验。首先，分析了不同井底位置下砂岩卸荷过程中的变形和声发射特征。其次，基于统计损伤理论对砂岩的塑性和能量特性进行了分析和解释。最后，讨论了不同井底位置采空区钻孔卸压支护作用下砂岩的破坏机理。结果表明：不同径向应力梯度对砂岩力学性能有不利影响，且孔深对其力学性能有非线性退化效应；利用损伤本构模型，能量演化和声发射特征验证了与井底位置相关的非线性退化，有效反映了岩石内部裂纹扩展。选择合适的井底位置和支护措施，可以有效防止顶板破裂，同时保持经济效益。本研究旨在有效减轻钻孔卸荷和开采扰动对顶板的破坏，保证开采安全高效。

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来源期刊

Geomechanics for Energy and the Environment Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

5.90

自引率

11.80%

发文量

期刊介绍： The aim of the Journal is to publish research results of the highest quality and of lasting importance on the subject of geomechanics, with the focus on applications to geological energy production and storage, and the interaction of soils and rocks with the natural and engineered environment. Special attention is given to concepts and developments of new energy geotechnologies that comprise intrinsic mechanisms protecting the environment against a potential engineering induced damage, hence warranting sustainable usage of energy resources. The scope of the journal is broad, including fundamental concepts in geomechanics and mechanics of porous media, the experiments and analysis of novel phenomena and applications. Of special interest are issues resulting from coupling of particular physics, chemistry and biology of external forcings, as well as of pore fluid/gas and minerals to the solid mechanics of the medium skeleton and pore fluid mechanics. The multi-scale and inter-scale interactions between the phenomena and the behavior representations are also of particular interest. Contributions to general theoretical approach to these issues, but of potential reference to geomechanics in its context of energy and the environment are also most welcome.