煤岩体耦合致裂作用下的强度劣化研究

doi:10.13722/j.cnki.jrme.2014.0564

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Abstract

To establish the relationship between the scheme of coupled-crack and strength deterioration for the coal and rock mass as the target，the interaction of injection water measure and blasting measure are defined as coupled-crack，and the coupled-crack mechanism is analyzed，giving the crack propagation criterion for the implementation of coupled-crack technology. Strength deterioration analysis method of fluid-solid coupling model affected by explosion is put forward. By using numerical simulation method，we establish the models for injecting water and obtaining explosion load，axially load is applied after finishing explosion loading，the strength degradation degree of overall model at different coupled-crack schemes is analyzed. The results show that: the essence of coupled-crack is that detonation gas and shock wave formed by explosion spreads in softened coal and rock mass，coupled-crack effect is greater than the simple superposition of basting and injection water；Improve water pressure can increase the strength degradation rate of coal and rock mass，model strength has a significantly decreased with the increase of drill diameter(explosion). The relationship between the coupled-crack parameters and strength deterioration degree of f is obtained，the damage degree of coal body caused by injection water pressure of explosive consumption is quantitatively evaluated. In engineering practice，the strength of coal mass from steeply dipping extra-thick coal seam after coupled-crack is 5.48 MPa，which has a decreased by 40.07% compared with the implementation of injection water. The working face recovery rate meets the requirements of national standards for thick coal seam，which realizes the objective of improving the top coal recovery rate，providing experiment method and basis for the quantitative evaluation of coupled-crack effect.

Key words： rock mechanics coal and rock mass blasting crack numerical simulation coupled-crack strength deterioration

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	Articles by authors
	CUI Feng1
	2
	LAI Xingping1
	2
	CAO Jiantao1
	2
	SHAN Pengfei1
	2

Cite this article:

CUI Feng1,2,LAI Xingping1, et al. STRENGTH DETERIORATION STUDY OF COAL AND ROCK MASS AFFECTED BY COUPLED-CRACK[J]. , 2015, 34(S2): 3633-3641.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.0564 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/IS2/3633

[1] 谢和平，王家臣，陈忠辉，等. 坚硬厚煤层综放开采爆破破碎顶煤技术研究[J]. 煤炭学报，1999，24(4)：350–354.(XIE Heping，WANG Jiachen，CHEN Zhonghui，et al. Study on top-coal blasting technique of full-mechanized caving in the hard thick coal seam[J]. Journal of China Coal Society，1999，24(4)：350–354.(in Chinese))

[2] 张子飞，来兴平. 复杂条件下急斜厚煤层高阶段综放开采超前预爆破[J]. 煤炭学报，2008，33(8)：845–849.(ZHANG Zifei，LAI Xingping. Segment pre-blasting of sublevel caving of steep and thick coal seam under complex conditions[J]. Journal of China Coal Society，2008，33(8)：845–849.(in Chinese))

[3] CUI F，LAI X P，CAO J T. Analysis on weakening effect of pre-blasting in top coal of steep and thick seams based on nonlinear dynamics[C]// CAI Meifeng ed. Proceedings of the 2nd ISRM International Young Scholar¢ Symposium On Rock Mechanics：Achievements and Ambitions. United States：Taylor and Francis Inc.，2012：775–778.

[4] 康天合，张建平，白世伟. 综放开采预注水弱化顶煤的理论研究及其工程应用[J]. 岩石力学与工程学报，2004，23(15)：2 615–2 621. (KANG Tianhe，ZHANG Jianping，BAI Shiwei. Theoretical study and application of weakening top coal using water pre-infusion in fully mechanized sublevel caving mining[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(15)：2 615–2 621.(in Chinese))

[5] 于斌，段宏飞. 特厚煤层高强度综放开采水力压裂顶板控制技术研究[J]. 岩石力学与工程学报，2014，33(4)：778–785.(YU Bin，DUAN Hongfei. Study of roof control by hydraulic fraturing in full-mechanized caving mining with high strength in extra-thick coal layer[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(4)：778–785. (in Chinese))

[6] HUANG B X，LIU C Y，FU J H，et al. Hydraulic fracturing after water pressure control blasting for increased fracturing[J]. International Journal of Rock Mechanics and Mining Sciences，2011，48(6)：976–983.

[7] 蔡美峰，冯锦艳，王金安. 露天高陡边坡三维固流耦合稳定性[J].北京科技大学学报，2006，28(1)：6–11.(CAI Meifeng，FENG Jinyan，WANG Jinan. Three-dimensional hydraulic coupled stability of a high steep open pit slope[J]. Journal of University of Science and Technology Beijing，2006，28(1)：6–11.(in Chinese))

[8] 潘鹏志，冯夏庭，吴红晓，等. 水压致裂过程的弹塑性细胞自动机模拟[J]. 上海交通大学学报，2011，45(5)：722–727.(PAN Pengzhi，FENG Xiating，WU Hongxiao. Modeling Hydraulic failure process using elasto-plastic cellular automaton[J]. Journal of Shanghai Jiaotong University，2011，45 (5)：722–727.(in Chinese))

[9] 倪冠华，林柏泉，翟成，等. 脉动水力压裂钻孔密封参数的测定及分析[J]. 中国矿业大学学报，2013，42(2)：177–182.(NI Guanhua，LIN Baiquan，ZHAI Cheng，et al. Borehole sealed parmeter measurement andlysis of pulsating hydraulic fraturing[J]. Journal of China University of Mining and Technology，2013，42(2)：177–182.(in Chinese))

[10] 张盛，王启智. 用5种圆盘试件的劈裂试验确定岩石断裂韧度[J].岩土力学，2009，30(1)：12–18.(ZHANG Sheng，WANG Qizhi. Determination of rock fracture toughness by split test using five types of disc specimens[J]. Rock and Soil Mechanics，2009，30(1)：12–18.(in Chinese))

[11] 吴礼舟，王启智，贾学明. 用人字形切槽巴西圆盘(CCNBD)确定岩石断裂韧度及其尺度律[J]. 岩石力学与工程学报，2004，23(2)：383–384.(WU Lizhou，WANG Qizhi，JIA Xueming. Determination of mode-I rock frature toughness with cracked chevron notched brazilian disc(CCNBD) and application of size effect law[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(2)：383–384.(in Chinese))

[12] 李夕兵，贺显群，陈红江. 渗透水压作用下类岩石材料张开型裂纹启裂特性研究[J]. 岩石力学与工程学报，2012，31(7)：1 317–1 324. (LI Xibing，HE Xianqun，CHEN Hongjiang. Crack initiation characteristics of opening-mode crack embedded in rock-like material under seepage pressure[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(7)：1 317–1 324.(in Chinese))

[13] 来兴平，崔峰，曹建涛，等. 特厚煤体爆破致裂机制及分区破坏的数值模拟[J]. 煤炭学报，2014，39(8)：1 642–1 649.(LAI Xingping，CUI Feng，CAO Jiantao，et al. Extra-thick coal blasting mechanism and numerical simulation of partition failure[J]. Journal of China Coal Society，2014，39(8)：1 642–1 649.(in Chinese))

[14] 刘新荣，傅晏，郑颖人，等. 颗粒流细观强度参数与岩石断裂韧度之间的关系[J]. 岩石力学与工程学报，2011，30(10)：2 084–2 089. (LIU Xinrong，FU Yan，ZHENG Yingren，et al. Relation between meso-parameters of particle flow code and fracture toughness of rock[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(10)：2 084–2 089.(in Chinese))

[15] 李江腾，古德生，曹平，等. 岩石断裂韧度与抗压强度的相关规律[J]. 中南大学学报：自然科学版，2009，40(6)：1 695–1 699.(LI Jiangteng，GU Desheng，CAO Ping，et al. Interrelated law between mode-I fracture toughness and compression strength of rock[J]. Journal of Central South University：Science and Technology，2009，40(6)：1 695–1 699.(in Chinese))

[16] 赵延林，曹平，汪亦显，等. 裂隙岩体渗流–损伤–断裂耦合模型及其应用[J]. 岩石力学与工程学报，2008，27(8)：1 634–1 643. (ZHAO Yanlin，CAO Ping，WANG Yixian，et al. Coupling model of seepage-frature in fractured rock mases and its application[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(8)：1 634–1 643. (in Chinese))

[17] 崔峰，来兴平，曹建涛，等. 煤体耦合致裂后整体-散体的等效转化及其垮放能力评估[J]. 岩石力学与工程学报，2015，34(3)：565–571.(CUI Feng，LAI Xingping，CAO Jiantao，et al. Overall-loose medium equivalent transformation of coal-mass after coupled-crack and assessment of its caving capability[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(3)：565–571.(in Chinese))