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| A study of fracture range of tunnel surrounding rock under blasting |
| LI Fangtao1, HU Zhiping1,2, CHEN Nannan1, ZHANG Yonghui1, AN Xuexu1 |
1.The School of Civil Engineering，Chang’an University, Xi’an 710000, China;
2.Institute of Underground Structure and Engineering, Chang’an University, Xi’an 710000, China |
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Abstract The Fractures of tunnel surrounding rock under blasting load create good conditions for karst development and groundwater movement. In order to study the fracture range of surrounding rock under blasting load, considering the influence of medium principal stress and circumferential tensile stress, two kinds of calculation models of crushing area are obtained based on unified strength criterion and Mohr Coulomb strength criterion respectively. When the crushing area is filled with blasting gas, the secondary expansion range of fracture is calculated. Then, the scope of crushing area and fracture area is calculated through an engineering example, and the calculation results are compared and verified with the site experiment results. Finally, the following conclusions are obtained: (1) The calculation method of crushing area based on unified strength theory considers plastic damage, which is suitable for the calculation of tunnel crushing area. The theoretical calculation results are in good agreement with the site experiments results. This method can be used to design blasting parameters of tunnel with strict control of over excavation and under excavation; (2) The calculation method of crushing area based on Mohr Coulomb strength criterion does not consider plastic damage. Compared with the existing calculation methods based on Mohr Coulomb strength criterion, the circumferential tensile stress is considered, and the calculation unit body is more in line with the actual stress situation. The main difference between the two calculation methods of crushing area in this paper is whether the range of plastic damage is included. The two calculation methods should be selected according to different engineering requirements in practical application; (3) The site experiment results show that the calculation results of the fracture zone range based on the unified strength theory are close to the site experiments results, and this method can be used to calculate the fracture range of tunnel surrounding rock under similar blasting action.
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Received: 29 July 2021
Published: 28 April 2022
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[1] Jimeno E L,Carcedo F J A. Drilling and blasting of rocks[M]. Taylor & Francis Group,1995.
[2] Ouchterlony F, Moser P . On the branching-merging mechanism during dynamic crack growth as a major source of fines in rock blasting[C]// nternational Symposium on Rock Fragmentation by Blasting . Boca Raton : CRC Press ,2016.
[3] 钱七虎. 岩石爆炸动力学的若干进展[J]. 岩石力学与工程学报, 2009, 028(010):1945-1968.
QIAN Qi-hu. Smoe advances in rock blasting dynamics[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 028(010):1945-1968.
[4] Ouchterlony F, J.A. Sanchidrián. A review of development of better prediction equations for blast fragmentation[J]. Journal of Rock Mechanics and Geotechnical Engineering, 2019.
[5] 邵鹏, 东兆星, 张勇. 岩石爆破模型研究综述[J]. 岩土力学, 1999(03):92-97.
Shao Peng, Dong Zhao-xing, Zhang Yong. Comment on the Research of Rock Blast Models[J]. Rock and Soil Mechanics, 1999(03):92-97.
[6] 何晓光, 周传波. 裂隙岩体爆破理论研究进展[J]. 辽宁科技学院学报, 2005(04):4-8+10.
He Xiao-guang, Zhou Chuan-bo. Research Progression in Blasting Theory for Fracture Rock Mass. Journal of LiaoNing Institute of science and technology, 2005(04):4-8+10.
[7] Szuladzinski G. Response of rock medium to explosive borehole pressure[C]//Procedings of the Fourth International Symposium on Rock Fragmentation by Blasting-Fragblast-4. Vienna, Austria, 1993: 17-23.
[8] Hustrulid W A. Blasting principles for open pit mining-Theoretical foundations[M]. Rotterdam: CRC Press/ Balkema, 1999.
[9] Ghosh A. Fractal and numerical models of explosive rock fragmentation[D]. Tucson: The University of Arizona. 1990.
[10] 冷振东, 卢文波, 陈明, et al. 岩石钻孔爆破粉碎区计算模型的改进[J]. 爆炸与冲击, 2015, 35(1):101-107.
Leng Zhen-dong, Lu Wen-bo, Chen Ming et al. Improved calculation model for the size of crushed zone around blasthole[J].Explosion and shock waves, 2015, 35(1):101-107.
[11] Vovk A A, Mikhalyuk A V, Belinskii I V. Development of fracture zones in rocks during camouflet blasting[J]. Soviet Mining, 1973, 9(4):383-387.
[12] Kanchibotla S S. Valery W, Morrel S. Modelling fines in blast fragmentation and its impact on crushing and grinding[C]//Proceeding of Explo’99-A Conference on Rock Breaking. Kalgoorlie, Australia, 1999:137-181.
[13] S Esen,I Onederra,H.A Bilgin. Modelling the size of the crushed zone around a blasthole[J]. International Journal of Rock Mechanics and Mining Sciences,2003,40(4).
[14] 戴俊. 岩石动力学特性与爆破理论[M].北京：冶金工业出版社, 2002.
Dai Jun. Dynamic Behaviors and Blasting Theory of Rock [M].Beijing: Metallurgical industry press, 2002.
[15] 费鸿禄, 苏强, 蒋安俊, et al. 爆破载荷下隧道围岩破坏裂隙范围研究[J]. 爆破器材, 2019, 48(02):55-60.
Fei Honglu, SU Qiang, JIANG Anjun, et al. Damage Fracture Range of Tunnel Surrounding Rock under Blasting Load[J].Explosive Materials,2019, 48(02):55-60.
[16] 刘永胜, 彭立, 王梦恕, et al. 爆破作用下隧道裂隙围岩破裂范围[J]. 中国公路学报, 2015, 28(10).
Liu Yong-sheng, Peng Li, Wang Meng-shu, et al. Blast-induced Fractured Zone of Fractured Rock-mass Tunnel[J]. China Journal of highway and transport, 2015, 28(10).
[17] 胡荣, 朱哲明, 胡哲源, et al. 爆炸动载荷下裂纹扩展规律的实验研究[J]. 岩石力学与工程学报, 2013, 32(7):1476-1481.
Hu Rong, Zhu Zhe-ming, Hu Zhe-yuan, et al. Experimental study of regularity of crack prppagation under blasting dynamic loads [J]. Chinese Journal of Rock Mechanics and Engineering, 2013, 32(7):1476-1481.
[18] Yu M H. Unified Strength Theory and Its Applications[M]. Springer-Verlag, 2004.
[19] 王文龙. 钻眼爆破 [M]. 北京：煤炭工业出版社, 1984.
Wang Wen-long. Dring and Blasting[M].Beijing: China Coal Industry Publishing House, 1984.
[20] 杨永琦. 矿山爆破技术与安全 [M]. 北京：煤炭工业出版社, 1991.
Yang Yong-qi. Mine blasting technology and safety[M].Beijing: China Coal Industry Publishing House, 1991.
[21] 熊海华, 卢文波, 李小联, et al. 龙滩水电站右岸导流洞开挖中爆破损伤范围研究[J]. 岩土力学, 2004, 25(3):432-436.
Xiong Haihua, Lu Wenbo, Li Xiaolian, et al. Study on blast-induced damage zone for excavation of diversion tunnel at right bank of Longtan Hydroelectric Project[J]. Rock and Soil Mechanics, 2004, 25(3):432-436.
[22] 戴俊. 柱状装药爆破的岩石压碎圈与裂隙圈计算[J]. 辽宁工程技术大学学报(自然科学版)(2):144-147.
Dai Jun. Calculation of radii of the broken and cracked areas in rock by a Long Charge Explosion[J]. Journal of Liaoning Technical University(Natural Science) (2):144-147.
[23] 杨善元. 岩石爆破动力学基础 [M]. 北京：煤炭工业出版社, 1993.
Yang Shanyuan. Dynamic basis of rock blasing[M].Beijing: China Coal Industry Publishing House, 1993.
[24] 高金石, 张继春. 爆破破岩机理动力分析[J]. 金属矿山, 1989(09):8-14.
Gao Jinshi, ZhangJichun. Dynamic Analysis of Rock Blasting Mechanism[J]. Metal Mine, 1989(09):8-14.
[25] 俞茂宏. 岩土类材料的统一强度理论及其应用[J]. 岩土工程学报, 1994, 16(2):1-10.
Yu Maohong. Unified strength theory for Geo-materials and its applications[J], Chinese Journal of Geotechnical Engineering, 1994, 16(2):1-10.
[26] Ghosh A. Fractal and numerical models of explosive rock fragmentation[D]. Tucson: The University of Arizona. 1990.
[27] 宗琦. 爆生气体的准静态破岩特性[J]. 岩土力学, 1997(2):73-78.
Zong Qi. Investigation on features of rock quasi-static fragmentation by gaseous explosion product[J].Rock and Soil Mechanics, 1997(2):73-78.
[28] 张玉明,员永峰,张奇. 切缝药包破岩机理及现场应用[J]. 爆破器材，2001，30(5):5-8.
Zhang Yuming, Yuan Yongfeng, Zhang Qi. The Slit-charge Breaking Rock Mechanism and Application[J], Explosive Materials, 2001,30(5):5-8.
[29] 刘军,孙辉.一种岩石I型断裂韧度KIC估算方法[J].土木工程,2018,7(01):74-81.
Liu Jun, Sun Hui. An estimation method for modeⅠ fracture toughness KIC of rocks[J]. Journal of Civil Engineering, 2018,7(01):74-81.
[30] 许东俊, 耿乃光. 岩石强度随中间主应力变化规律[J]. 固体力学学报, 1985(01):77-85.
Xu Dongjun, Geng Naiguang. The variation law of rock strength with increase of intermediate principal stress[J]. Chinese Journal of Solid Mechanics, 1985(01):77-85.
[31] 李小春 ,许东俊.中间主应力对岩石强度的影响程度和规律[J].岩土力学,1991(01):9-16.
Li Xiaochun, Xu Dongjun. Law and Degree of Effect the Intermediate Principle Stress on Strength of Rock[J]. Rock and Soil Mechanics, 1991(01):9-16.
[32] 傅鹤林,史越,龙燕,张加兵,黄震.中主应力系数对岩石强度准则的影响[J].中南大学学报(自然科学版),2018,49(01):158-166.
Fu Heling, Shi Yue, Long Yan, et al. Influence of intermediate principle stress coefficient on rock strength criterion [J].Journal of Central South University(Science and Technology) ,2018,49(01):158-166.
[33] 乔兰,潘晓震,崔明.地质雷达在节理裂隙岩体预报中的应用[J].施工技术,2013,42(S2):256-259.
Qiao Lan, Pan Xiaozhen, Cui Ming. GPR for the forecast in jointed rock mass[J]. Construction Technology, 2013,42(S2):256-259.
[34] 李尧,李术才,刘斌,徐磊,张凤凯,聂利超.基于改进后向投影算法的地质雷达探测岩体裂隙的成像方法[J].岩土工程学报,2016,38(08):1425-1433.
LI Yao, LI Shu-cai, LIU Bin, XU Lei, ZHANG Feng-kai, NIE Li-chao. Imaging method of ground penetrating radar for rock fracture detection based on improved back projection algorithm[J]. Chinese Journal of Geotechnical Engineering, 2016,38(08):1425-1433. |
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