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Study on stability mechanism and control techniques of surrounding rock in gob-side entry retaining with flexible formwork concrete wall

柔模混凝土墙沿空留巷围岩稳定机理及控制技术研究

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Abstract

Gob-side entry retaining (GER) is a technique in non-pillar mining, which maintains the original mining roadway along the edge of gob and retains it as a mining roadway for the subsequent working face. This technique offers significant advantages such as a high coal mining rate and cost-effective roadway retention. This paper focus on the GER implementation in 52605 panel of Daliuta Coal Mine and introduce an innovative technique involving the utilization of flexible formwork concrete wall (FFCW). To verify the feasibility of this technique, a numerical model was established. Furthermore, the stability mechanism of surrounding rock during the mining process of 52605 panel was thoroughly examined. Simulation results indicate that during the mining, the roadside backfill body (RBB) gradually bears load, causing peak stress transfer from gob side towards solid coal side. Moreover, plastic zone of roof and solid coal exhibited a noticeable increase, leading to a combined tensile-shear failure. Based on the stress and plastic zone evolution characteristics of surrounding rock during the mining process of the working face, control techniques were proposed and industrial experiment was successfully carried out. Ultimately, on-site monitoring results show that the deformation control effect of surrounding rock was good, and there was no obvious pressure manifestation in the working face.

摘要

沿空留巷是无煤柱开采中的一种技术, 是沿采空区边缘维护原回采巷道, 并将其保留作为下个工作面的一条回采巷道使用, 具有煤炭采出率高、巷道维护费用低等优点. 本文以大柳塔煤矿 52605 工作面沿空留巷为工程背景, 介绍了一种柔模混凝土墙沿空留巷的创新技术. 为了验证该技术的可行性, 本文根据现场地质条件建立了数值计算模型, 并研究了工作面回采过程中沿空留巷围岩的稳定机理. 数值模拟结果显示: 工作面回采期间, 巷旁充填体逐渐承载, 围岩应力峰值由回采侧向实煤体侧转移, 顶板和实煤体侧塑性区明显增大, 发生拉剪混合破坏. 基于工作面回采期间沿空留巷围岩的应力和塑性区演化特征, 提出了围岩控制技术并成功开展了工业性实验. 现场监测结果显示, 巷道围岩变形控制效果良好, 工作面无明显压力显现.

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Authors and Affiliations

  1. School of Mine, China University of Mining and Technology, Xuzhou, 221116, China

    Ding-chao Chen  (陈定超), **ang-yu Wang  (王襄禹), Fei-teng Zhang  (张飞腾), **ang-dong Wang  (王祥东) & Meng-long Li  (**梦龙)

  2. Daliuta Coal Mine, CHN Energy Shendong Coal Group, Shenmu, 719315, China

    Shuai Wu  (吴帅) & Zai-zhuang Fan  (樊在壮)

Authors
  1. Ding-chao Chen  (陈定超)
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  2. **ang-yu Wang  (王襄禹)
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  3. Shuai Wu  (吴帅)
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  7. Meng-long Li  (**梦龙)
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Contributions

CHEN Ding-chao developed the overarching research goals and edited the draft of manuscript. WANG **ang-yu conducted the literature review. WU Shuai and ZHANG Fei-teng established the models. FAN Zai-zhuang and WANG **ang-dong analyzed the results. LI Meng-long edited the manuscript.

Corresponding author

Correspondence to **ang-yu Wang  (王襄禹).

Ethics declarations

CHEN Ding-chao, WANG **ang-yu, WU Shuai, ZHANG Fei-teng, FAN Zai-zhuang, WANG **ang-dong, LI Meng-long declare that they have no conflict of interest.

Additional information

Foundation item: Project(52174132) supported by the National Natural Science Foundation of China; Project(2020YFB1314204) supported by the National Key Research and Development Program of China

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Chen, Dc., Wang, Xy., Wu, S. et al. Study on stability mechanism and control techniques of surrounding rock in gob-side entry retaining with flexible formwork concrete wall. J. Cent. South Univ. 30, 2966–2982 (2023). https://doi.org/10.1007/s11771-023-5436-z

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