Rock and Soil Mechanics ›› 2022, Vol. 43 ›› Issue (12): 3453-3462.doi: 10.16285/j.rsm.2022.0600

• Geotechnical Engineering • Previous Articles     Next Articles

Stability calculation of backfill roof in downward roadway under multifactor influence

WANG Xiao-jun1, 2, GUO Peng1, HUANG Wei-sheng3, CHEN Zhi-hong3, CHEN Qing-lin1, 2, ZHAO Kui1, 2   

  1. 1. School of Resources & Environment Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China; 2. Jiangxi Key Laboratory of Mining Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China; 3. Wushan Copper Mine, Jiangxi Copper Industry Co., Ltd., Ruichang, Jiangxi 332200, China
  • Received:2022-04-25 Revised:2022-06-23 Online:2022-12-28 Published:2023-01-05
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(52104085), the Jiangxi Province “Double Thousand Plan” Scientific and Technological Innovation High-End Talents Project (jxsq2019201043) and the Young Jinggang Scholars Award Program in Jiangxi Province(QNJG2018051).

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Abstract:

In the downward drift cut and fill mining method, the stability of the backfill roof is very important to the safety of the mining process. However, the calculation of the superimposed load of the slicing and backfill is always a difficulty in the stability analysis of the roof. In this paper, an equilibrium differential equation of the roof is derived and its theoretical solution of the static load of the roof is obtained by fully considering the engineering practice such as the load of the mining rock, the dip angle of the ore body, the staggered arrangement of the adjacent layered roadway, and the contact between the backfill and the surrounding rock. By combining with the mining process, a mechanical model of “multi-span beam” is established, and the theoretical calculation formula of tensile stress of roof is obtained. The four important theoretical factors affecting stability of roof were analyzed: the upper load of roof σ v, the roadway span l, the thickness of 1:4 backfill h, and the tensile strength of backfill itself [σ t]. In order to fully consider the influence of static load and blast load on the roof, FLAC3D is used to simulate the orthogonal calculation of roof stability under the influence of multiple factors. According to the simulation results, the influence of various factors on the roof tensile stress is analyzed, and the stability evaluation model of roof under the influence of multiple factors is established by using the method of multiple nonlinear regression. The model is applied to the field practice of a copper mine test stope, showing good practicality.

Key words: multi-span beams, orthogonal experiment, multiple nonlinear regression, numerical modeling

CLC Number: 

  • TU457
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