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).

PDF (Chinese)

93

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
[1] ZHANG Tao-lin, GENG Han-sheng, XU Hong-fa, MO Jia-quan, LIN Yi-fan, MA Lin-jian. Experimental study on calcareous sand grout material preparation and performance of consolidated solids [J]. Rock and Soil Mechanics, 2022, 43(S2): 327-336.
[2] SHARAFUTDINOV Rafael. Statistical and regression analyses of sands stiffness in triaxial tests and application of the results [J]. Rock and Soil Mechanics, 2022, 43(10): 2873-2886.
[3] FU Hong-yuan, LIU Jie, ZENG Ling, BIAN Han-bing, SHI Zhen-ning, . Deformation and strength tests of pre-disintegrating carbonaceous mudstone under loading and soaking condition [J]. Rock and Soil Mechanics, 2019, 40(4): 1273-1280.
[4] CAI Qi-peng, GAN Gang-lu, NG C. W. W., CHEN Xing-xin, XIAO Zhao-yun, . Study on failure mechanism and setback distance of a pile group in sand subjected to normal faulting [J]. Rock and Soil Mechanics, 2019, 40(3): 1067-1075.
[5] CUI Fang-peng, XU Qiang, YIN Yue-ping, HU Rui-lin, CHEN Zi-juan, LIU Wei,. Dynamic response of slope based on fracture mechanisms of strip-shape hypocenter [J]. , 2018, 39(1): 320-330.
[6] WANG Peng, SHU Cai, SHI Feng, HU Guo-zhong, WANG Hong-tu,. Orthogonal experimental study of similar materials properties of different densities, sand-binder ratios and residual moisture contents [J]. , 2017, 38(S2): 229-235.
[7] SUN Kai-qiang, TANG Chao-sheng, LIU Chang-li, LI Hao-da, WANG Peng, LENG Ting. Research methods of soil desiccation cracking behavior [J]. , 2017, 38(S1): 11-26.
[8] LI Jian-bin, LIU Han-long, KONG Gang-qiang, XIAO Yang, CHU Jian，. Analysis of settlement of reinforced operating expressway using lateral radiation grouting technique [J]. , 2017, 38(S1): 479-487.
[9] YU Peng-cheng, ZHANG Ying-bin, ZHAO Xing-quan, HUANG Xiao-fu，. An improved contact searching method in 2D-DDA [J]. , 2017, 38(3): 902-910.
[10] LI Guo-wei , GU Zhong-we , HE Guan-jun, ZHANG Jun-biao, WANG Run, HU Long-sheng，. Anchorage scheme against imminent failure of slope based on on-site monitoring and 3D numerical modeling [J]. , 2016, 37(5): 1408-1416.
[11] JIANG De-yi , ZHANG Jun-wei , CHEN Jie , REN Song , YANG Chun-he , . Analysis of influencing factors of salt rock’s shear characteristics in brine soak environment [J]. , 2015, 36(2): 333-339.
[12] LIU Xiao-min ，SHENG Qian ，CHEN Jian ，KE Wen-hui ，YANG Ji-hua,. Seismic shaking table test for large-scale underground cavern group (Ⅰ): Proportioning test on similar materials of surrounding rock [J]. , 2015, 36(1): 83-88.
[13] SONG Wei-dong ，CAO Shuai ，FU Jian-xin ，JIANG Guo-jian ，WU Feng，. Sensitivity analysis of impact factors of pillar stability and its application [J]. , 2014, 35(S1): 271-277.
[14] JIA Chao，ZHANG Kai，ZHANG Qiang-yong，XU Kun. Research on multi-factor optimization of underground laminated salt rock storage group based on orthogonal experimental design [J]. , 2014, 35(6): 1718-1726.
[15] WANG Xiao-jun , FENG Xiao , ZHAO Kui , SHAO Hai , YE Zi-huan，. Study of critical thickness of roof of level pillar stoping under multifactor influence [J]. , 2013, 34(12): 3505-3512.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
[1] YAO Yang-ping, HOU Wei. Basic mechanical behavior of soils and their elastoplastic modeling[J]. , 2009, 30(10): 2881 -2902 .
[2] XU Jin-ming, QIANG Pei, ZHANG Peng-fei. Texture analysis of photographs of silty clay[J]. , 2009, 30(10): 2903 -2907 .
[3] XIANG Tian-bing, FENG Xia-ting, CHEN Bing-rui, JIANG Quan, ZHANG Chuan-qing. Rock failure mechanism and true triaxial experimental study of specimens with single structural plane under three-dimensional stress[J]. , 2009, 30(10): 2908 -2916 .
[4] SHI Yu-ling, MEN Yu-ming, PENG Jian-bing, HUANG Qiang-bing, LIU Hong-jia. Damage test study of different types structures of bridge decks by ground-fissure[J]. , 2009, 30(10): 2917 -2922 .
[5] XIA Dong-zhou, HE Yi-bin, LIU Jian-hua. Study of damping property and seismic action effect for soil-structure dynamic interaction system[J]. , 2009, 30(10): 2923 -2928 .
[6] XU Su-chao, FENG Xia-ting, CHEN Bing-rui. Experimental study of skarn under uniaxial cyclic loading and unloading test and acoustic emission characteristics[J]. , 2009, 30(10): 2929 -2934 .
[7] ZHANG Li-ting, QI Qing-lan, WEI Jing HUO Qian, ZHOU Guo-bin. Variation of void ratio in course of consolidation of warping clay[J]. , 2009, 30(10): 2935 -2939 .
[8] ZHANG Qi-yi. Study of failure patterns of foundation under combined loading[J]. , 2009, 30(10): 2940 -2944 .
[9] YI Jun, JIANG Yong-dong, XUAN Xue-fu, LUO Yun, ZHANG Yu. A liquid-solid dynamic coupling modelof ultrasound enhanced coalbed gas desorption and flow[J]. , 2009, 30(10): 2945 -2949 .
[10] TAO Gan-qiang, YANG Shi-jiao, REN Feng-yu. Experimental research on granular flow characters of caved ore and rock[J]. , 2009, 30(10): 2950 -2954 .
Copyright © Rock and Soil Mechanics, All Rights Reserved.
Tel: 027-87198484, 87199252, 87199253, 87198752　E-mail: ytlx@whrsm.ac.cn
Powered by Beijing Magtech Co. Ltd