Numerical simulation of propagation law of pore-fracture under uniaxial stress

Authors

GUO Xiucheng, Engineering and Technology Research Institute of Great Wall Drilling Engineering Co. Ltd., Panjin 124010, China

Abstract

in order to study the law of crack propagation under different pore-fracture conditions, the crack propagation process, acoustic emission law and stress-strain curve under different crack inclination angle and different heterogeneous coefficient were numerically simulated by using RFPA software. At the same time, the results are compared with the experimental results. The results show that the cracks of the intact specimen are produced along the shear direction, while the cracks of the specimens with pores occur along the side of the crack tip and the orifice. The secondary cracks in horizontal direction and bifurcation at the prefabricated crack tip or the side of the orifice at the same time are produced through the specimens with wing cracks, and the heterogeneity coefficient affects the strike of the secondary cracks. Pre-ballast specimen with tensile failure in the late stage of the main and ballast stage, the tensile-shear combination is mainly destroyed, and the generation of secondary cracks is related to the shear failure. The cumulative energy of the acoustic emission and the acoustic emission increased slowly in the early stage; and rapidly in the later stage, the smaller the inclination angle of the pre-cast crack, the larger the heterogeneous coefficient, the greater the accumulated energy of the acoustic emission, and the stress time curves of the test pieces at different crack inclination angles and different mean values are all subjected to three stages. The existence of the porosity reduces the peak strength of the samples and affects the brittleness of the specimens. The results of the study provide some reference for further understanding the law of the pore-gap interaction.

Keywords

uniaxial stress, pore-fracture action, acoustic emission, crack propagation, stress-strain curve, numerical simulation

DOI

10.3969/j.issn.1001-1986.2020.02.027

Recommended Citation

G. (2020) "Numerical simulation of propagation law of pore-fracture under uniaxial stress," Coal Geology & Exploration: Vol. 48: Iss. 2, Article 28.
DOI: 10.3969/j.issn.1001-1986.2020.02.027
Available at: https://cge.researchcommons.org/journal/vol48/iss2/28

Reference

[1] 冯彦军,康红普. 受压脆性岩石Ⅰ-Ⅱ型复合裂纹水力压裂研究[J]. 煤炭学报,2013,38(2):226-232. FENG Yanjun,KANG Hongpu. The initiation ofⅠ-Ⅱmixed mode crack subjected to hydraulic pressure in brittle rock under compression[J]. Journal of China Coal Society,2013,38(2):226-232.

[2] 严鹏,陈拓,卢文波,等. 岩爆动力学机理及其控制研究进展[J]. 武汉大学学报(工学版),2018,51(1):1-14. YAN Peng,CHEN Tuo,LU Wenbo,et al. A review of dynamic mechanism and controlling of rock burst[J]. Journal of Wuhan University(Engineering Edition),2018,51(1):1-14.

[3] 郭建强,刘新荣. 强度准则与岩爆判据统一的研究[J]. 岩石力学与工程学报,2018,37(增刊1):3340-3352. GUO Jianqiang,LIU Xinrong. Study on the uniformity between strength criterion and rock burst criterion[J]. Journal of Rock Mechanics and Engineering,2018,37(S1):3340-3352.

[4] 郭品坤. 煤与瓦斯突出层裂发展机制研究[D]. 徐州:中国矿业大学,2014. GUO Pinkun. Research on laminar spallation mechanism of coal and gas outburst propagation[D]. Xuzhou:China University of Mining and Technology,2014.

[5] 刘瑞峰,朱哲明,刘邦,等. 爆炸载荷下砂岩动态断裂特性的试验研究[J]. 岩石力学与工程学报,2019,38(3):445-454. LIU Ruifeng,ZHU Zheming,LIU Bang,et al. Experimental study on dynamic fracture characteristics of sandstones under blasting[J]. Journal of Rock Mechanics and Engineering,2019,38(3):445-454.

[6] 陈雪峰,赵孝学,汪海波,等. 节理充填岩体爆炸应力波传播规律模型试验与应用研究[J]. 中国安全生产科学技术,2018,14(12):130-134. CHEN Xuefeng,ZHAO Xiaoxue,WANG Haibo,et al. Model tests and application research on propagation laws of blasting stress wave in jointed and filled rock mass[J]. Journal of Safety Science and Technology,2018,14(12):130-134.

[7] 王飞,曹平,曹日红,等. 平行节理相互作用对节理岩体的力学行为影响[J]. 中南大学学报(自然科学版),2018,49(10):2498-2507. WANG Fei,CAO Ping,CAO Rihong,et al. Influence of parallel joint interaction on mechanical behavior of jointed rock mass[J]. Journal of Central South University(Science and Technology),2018,49(10):2498-2507.

[8] 岳中文,邱鹏,杨仁树,等. 切槽炮孔偏心装药爆源近区裂纹动态力学特征实验研究[J]. 岩石力学与工程学报,2017,36(增刊2):3792-3798. YUE Zhongwen,QIU Peng,YANG Renshu,et al. Experimental study on crack dynamic mechanical characteristic near blasting source of grooved borehole with eccentric decouple charge[J]. Journal of Rock Mechanics and Engineering,2017,36(S2):3792-3798.

[9] 李竟艳,高文学,宋肖龙. 岩石材料动载下泛形裂纹扩展数值模拟[J]. 振动与冲击,2018,37(22):88-91. LI Jingyan,GAO Wenxue,SONG Xiaolong. Numerical simulation on the extension of a ubiquitiformal crack of rock materials under dynamic loading[J]. Journal of Vibration and shock,2018,37(22):88-91.

[10] 李宏,张丽萍,邓清海,等. 非贯通裂隙岩体的单轴压缩颗粒流数值模拟[J]. 水力发电,2018,44(11):26-30. LI Hong,ZHANG Liping,DENG Qinghai,et al. Numerical simulation of uniaxial compression particle flow in non-penetrating fractured rock mass[J]. Water Power,2018,44(11):26-30.

[11] 周喻,刘冰,王莉,等. 单轴压缩条件下含双圆孔类岩石试样力学特性的细观研究[J]. 岩石力学与工程学报,2017,36(11):2662-2671. ZHOU Yu,LIU Bing,WANG Li,et al. Mesoscopic mechanical properties of rock-like material containing two circular holes under uniaxial compression[J]. Journal of Rock Mechanics and Engineering,2017,36(11):2662-2671.

[12] 章广成,胡静. 非贯通单节理岩体裂纹扩展方向研究[J]. 煤田地质与勘探,2011,39(4):43-48. ZHANG Guangcheng,HU Jing. Study on crack propagation direction of intermittent single jointed rock mass[J]. Coal Geology & Exploration,2011,39(4):43-48.

[13] 张力民,张慧,刘红岩. 单轴压缩荷载下非贯通闭合节理岩体损伤本构模型[J]. 煤田地质与勘探,2016,44(1):79-84. ZHANG Limin,ZHANG Hui,LIU Hongyan. A damage constitutive model for rock mass with non-persistently closed joints under uniaxial compression load[J]. Coal Geology & Exploration,2016,44(1):79-84.

[14] 姚改焕,宋战平,余贤斌. 石灰岩声发射特性的试验研究[J].煤田地质与勘探,2006,34(6):44-46. YAO Gaihuan,SONG Zhanping,YU Xianbin. Experimental study on acoustic emission characteristics of limestone[J]. Coal Geology & Exploration,2006,34(6):44-46.

[15] 骆中山,曹函,孙平贺,等. 水力压裂脉冲频率对煤岩预制孔密封效果影响[J]. 煤田地质与勘探,2018,46(2):190-195. LUO Zhongshan,CAO Han,SUN Pinghe,et al. Influence of hydraulic fracturing pulse frequency on precasting sealing effect of coal rock[J]. Coal Geology & Exploration,2018,46(2):190-195.

[16] 张帆,马耕,刘晓,等. 煤岩水力压裂起裂压力和裂缝扩展机制实验研究[J]. 煤田地质与勘探,2017,45(6):84-89. ZHANG Fan,MA Geng,LIU Xiao,et al. Experimental study on initiation pressure and mechanism of fracture propagation of hydraulic fracturing in coal and rock mass[J]. Coal Geology & Exploration,2017,45(6):84-89.

[17] 李地元,成腾蛟,周韬,等. 冲击载荷作用下含孔洞大理岩动态力学破坏特性试验研究[J]. 岩石力学与工程学报,2015,34(2):249-260. LI Diyuan,CHENG Tengjiao,ZHOU Tao,et al. Experimental study of the dynamic strength and fracturing characteristics of marble specimens with a single hole under impact loading[J]. Journal of Rock Mechanics and Engineering,2015,34(2):249-260.

[18] 王蒙,朱哲明,谢军. 岩石Ⅰ-Ⅱ复合型裂纹动态扩展SHPB实验及数值模拟研究[J]. 岩石力学与工程学报,2015,34(12):2474-2485. WANG Meng,ZHU Zheming,XIE Jun. Experimental and numerical studies of the mixed-modeⅠandⅡcrack propagation under dynamic loading using SHPB[J]. Journal of Rock Mechanics and Engineering,2015,34(12):2474-2485.

[19] 程龙,杨圣奇,刘相如. 含缺陷砂岩裂纹扩展特征试验与模拟研究[J]. 采矿与安全工程学报,2012,29(5):719-724. CHENG Long,YANG Shengqi,LIU Xiangru. Experimental and numerical investigation on crack expansion of sandstone containing flaws[J]. Journal of Mining & Safety Engineering,2012,29(5):719-724.