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Development of a New Gob-Side Entry-Retaining Approach and Its Application

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  • Hengjie Luan

    (State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China)

  • Yujing Jiang

    (State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China)

  • Huili Lin

    (Mine Safety Technology Branch of China Coal Research Institute, Beijing 100013, China)

  • Guofeng Li

    (Dongtan Coal Mine, Yanzhou Mining Industry Group, Zoucheng 273512, China)

Abstract

Gob-side entry retaining plays an important role in the sustainable exploitation of coal resources and has been widely used in coal mining. However; some disadvantages, such as high labour intensity and low efficiency of wall construction, have gravely restricted the application of this technique. To solve this issue, this paper developed a new gob-side entry retaining approach including a lightweight and high-strength foam concrete and a mortise-and-tenon structure hollow-block wall. The experiment results show that the preparation of foam concrete with a density of 1200 kg/m 3 ; with uniaxial compressive strength greater than 15 MPa, can be realized by the chemical-foaming method. The method is performed by adding silica fume, slag and fly ash to a system of “cement and sand” structure collocation and by optimizing the proportioning of the materials. The density of foam concrete is reduced by 50% relative to that of common concrete which can greatly reduce the weight of the blocks. Compared with the conventional gob-side entry-retaining wall the new wall structure has many advantages. For example, it can improve stability by increasing the width-to-height ratio of the wall and save 44.44% of the material, and at the same time; it can save manpower and improve labour efficiency. Finally, the new approach was tested in the 3203 gob-side entry-retaining working face in a Chinese coal mine and the application effect proves that the new approach is well suited for entry retaining. The wall structure and parameters are reasonable. This work can contribute to the sustainable and efficient exploitation of underground coal resources.

Suggested Citation

  • Hengjie Luan & Yujing Jiang & Huili Lin & Guofeng Li, 2018. "Development of a New Gob-Side Entry-Retaining Approach and Its Application," Sustainability, MDPI, vol. 10(2), pages 1-15, February.
  • Handle: RePEc:gam:jsusta:v:10:y:2018:i:2:p:470-:d:131196
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    References listed on IDEAS

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    1. Hong-sheng Wang & Dong-sheng Zhang & Lang Liu & Wei-bin Guo & Gang-wei Fan & KI-IL Song & Xu-feng Wang, 2016. "Stabilization of Gob-Side Entry with an Artificial Side for Sustaining Mining Work," Sustainability, MDPI, vol. 8(7), pages 1-17, July.
    2. Dongjing Xu & Suping Peng & Shiyao Xiang & Yunlan He, 2017. "A Novel Caving Model of Overburden Strata Movement Induced by Coal Mining," Energies, MDPI, vol. 10(4), pages 1-13, April.
    3. Zhiyi Zhang & Hideki Shimada & Takashi Sasaoka & Akihiro Hamanaka, 2017. "Stability Control of Retained Goaf-Side Gateroad under Different Roof Conditions in Deep Underground Y Type Longwall Mining," Sustainability, MDPI, vol. 9(10), pages 1-19, September.
    4. Yubing Gao & Dongqiao Liu & Xingyu Zhang & Manchao He, 2017. "Analysis and Optimization of Entry Stability in Underground Longwall Mining," Sustainability, MDPI, vol. 9(11), pages 1-19, November.
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    Cited by:

    1. Zhiqiang Wang & Jiao Zhang & Jingkai Li & Peng Wang & Chao Wu & Lei Shi, 2022. "Research of Surrounding Rock Control of Gob-Side Entry Retaining Based on Deviatoric Stress Distribution Characteristics," Sustainability, MDPI, vol. 14(9), pages 1-21, May.
    2. Zhaowen Du & Shaojie Chen & Junbiao Ma & Zhongping Guo & Dawei Yin, 2020. "Gob-Side Entry Retaining Involving Bag Filling Material for Support Wall Construction," Sustainability, MDPI, vol. 12(16), pages 1-20, August.
    3. Dong Wang & Yujing Jiang & Xiaoming Sun & Hengjie Luan & Hui Zhang, 2019. "Nonlinear Large Deformation Mechanism and Stability Control of Deep Soft Rock Roadway: A Case Study in China," Sustainability, MDPI, vol. 11(22), pages 1-20, November.
    4. Zhijun Tian & Zizheng Zhang & Min Deng & Shuai Yan & Jianbiao Bai, 2020. "Gob-Side Entry Retained with Soft Roof, Floor, and Seam in Thin Coal Seams: A Case Study," Sustainability, MDPI, vol. 12(3), pages 1-22, February.
    5. Krzysztof Skrzypkowski, 2020. "Decreasing Mining Losses for the Room and Pillar Method by Replacing the Inter-Room Pillars by the Construction of Wooden Cribs Filled with Waste Rocks," Energies, MDPI, vol. 13(14), pages 1-20, July.

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