Rock and Soil Mechanics ›› 2022, Vol. 43 ›› Issue (11): 3036-3046.doi: 10.16285/j.rsm.2022.0008

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Rock cutting characteristics with single pick and prediction of cutting force based on force chain

DONG Lei1, 2, ZHANG Hua1, LÜ Ji-shuang2, 3, SHI Rui-min1, 2   

  1. 1. School of Mechanical and Power Engineering, North University of China, Taiyuan, Shanxi 030051, China; 2. National Engineering Laboratory of Coal Mining Machinery Equipment, Taiyuan, Shanxi 030032, China; 3. Taiyuan Institution, China Coal Technology and Engineering Group, Taiyuan, Shanxi 030006, China
  • Received:2022-01-05 Revised:2022-07-13 Online:2022-11-11 Published:2022-11-29
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51875152), the Natural Science Foundation of Shanxi Province (20210302123065) and the Key Projects of Tiandi Science and Technology Co. , Ltd.(KY202054).

PDF (Chinese)

178

PDF (English)

9

Abstract: The pick is the main load-bearing object of the mining machinery for cutting coal, and the prediction of the cutting force from the working face is very important to reduce the wear of the pick. The rock was considered as a particle matter for single pick cutting simulation by using the particle flow code (PFC2D). The influence of the contact state on the cutting force of the single pick was discussed by studying the characteristics of the interparticle force chain during cutting. The cutting force test was carried out on a single pick cutting rock test equipment, and the changing law of normal and tangential force with cutting parameters and the characteristics of falling fragments were obtained. The research results show that the relationship between the number of force chains and the length of the force chains for rock particles cut by a single pick is consistent with the uniaxial compression test results, and the cutting state of the single pick can be simulated by using discrete element method. The force chain network spreads and extends along the point contact direction, which is related to the cutting angle. The average normal force direction is "peanut"-like whereas the tangential force direction is "petal"-like. In addition, the number of force chains decreases with the decrease of cutting angle and the increase of cutting depth. The length of force chains increases with the increase of cutting distance. The maximum average length is about 8 particle sizes. The force chains tend to form at larger cutting angles. Furthermore, the normal force and tangential force of single pick cutting of natural sandstone decrease with the increase of cutting angle and the decrease of cutting depth. The linear correlation between the size of the cutting fragments and the cutting tangential force is 0.87. Compared with the Evans prediction model, the accuracy of normal force and tangential force based on force chain length is improved by 17.6% and 16.9% respectively. The research results lay a certain research foundation for the design of cutting pick, mining machinery cutting system and the optimization of cutting technology.

Key words: granular material, single pick cutting, force chain, force prediction

CLC Number: 

  • TU 312
[1] YIN Zhen-yu, CHEN Jia-ying, WU Ze-xiang, JIN Yin-fu, . Development of elastoplastic model simulator using MATLAB GUI [J]. Rock and Soil Mechanics, 2022, 43(S2): 524-532.
[2] YANG Xiao-juan, MA Gang, ZHOU Heng, LU Xi, LI Yi-ao, ZHOU Wei, . Study on precursors of diffuse instability of granular materials based on complex network theory [J]. Rock and Soil Mechanics, 2022, 43(7): 1978-1988.
[3] LIU Yang, YU Peng-qiang, XU Shuo. Wave propagation in anisotropic granular materials based on micromorphic continua [J]. Rock and Soil Mechanics, 2022, 43(3): 635-648.
[4] LIU Biao, WANG Qiao, ZHANG Zong-liang, ZHOU Wei, FENG Y T, PENG Zhang-zhen, LI Yun-sheng, XU Jun, GUO Kai, . Calculation of stress field and particle breakage paths for granular system based on the combined boundary-discrete element method [J]. Rock and Soil Mechanics, 2022, 43(12): 3493-3502.
[5] JIANG Jing-shan, ZUO Yong-zhen, CHENG Zhan-lin, PAN Jia-jun, . Investigation of strength properties of coarse granular material at different densities using large-scale true triaxial tests [J]. Rock and Soil Mechanics, 2020, 41(8): 2601-2608.
[6] ZHAN Ya-tai, WANG Jin-an, LI Fei, YANG Liu, . Photo-elastic experimental study on force chain structure and evolution of fault fracture zone under shear [J]. Rock and Soil Mechanics, 2020, 41(8): 2627-2635.
[7] WU Qi-xin, YANG Zhong-xuan. Incremental behavior of granular soils: a strain response envelope perspective [J]. Rock and Soil Mechanics, 2020, 41(3): 915-922.
[8] JIANG Jing-shan, ZUO Yong-zhen, CHENG Zhan-lin, PAN Jia-jun, ZHANG Chao, WEI You-xin, . Effects of stress state on mechanical properties of coarse granular material using large-scale true triaxial tests [J]. Rock and Soil Mechanics, 2020, 41(11): 3563-3572.
[9] FU Long-long, ZHOU Shun-hua, TIAN Zhi-yao, TIAN Zhe-kan, . Force chain evolution in granular materials during biaxial compression [J]. Rock and Soil Mechanics, 2019, 40(6): 2427-2434.
[10] LIU Yang, LI Shuang. Numerical simulation and analysis of meso-mechanical structure characteristic at critical state for granular media [J]. , 2018, 39(6): 2237-248.
[11] XUE Long, WANG Rui, ZHANG Jian-min, . DEM numerical test method for granular matter under complex 3D loading [J]. Rock and Soil Mechanics, 2018, 39(12): 4681-4690.
[12] WANG Yin, AI Jun, YANG Qing,. A CFD-DEM coupled method incorporating soil inter-particle rolling resistance [J]. , 2017, 38(6): 1771-1780.
[13] GUO Xing-wen, ZHAO Qian, GU Shui-tao, CAI Xin, . Creep property of granular materials based on viscoelastic interface between micro structural granular [J]. , 2016, 37(S2): 105-112.
[14] ZHANG Duo , LIU Yang , WU Shun-chuan , . Simulation of strength characteristics of granular materials in true triaxial test for different stress paths and its mesoscopic mechanism analysis [J]. , 2016, 37(S1): 509-520.
[15] WU Ying，MA Gang，ZHOU Wei，YANG Li-fu. Optimization of gradation of rockfill materials based on the fractal theory [J]. , 2016, 37(7): 1977-1985.
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