To study the influence of weak interlayers on the stability of roadway surrounding rocks under dynamic disturbance, the finite element software Abaqus was used to numerically analyze the mechanical response of surrounding rocks of Dongguashan copper mine roadway under blasting, and an optimized support scheme was proposed. The results show that the vertical stress of roadway vault and bottom amplitude fluctuation of the roadway with weak interlayers are higher than those of the roadway without weak interlayers, and the bottom changed apparently, while the horizontal stress fluctuation amplitude of the roadway with weak interlayers is lower than that of the roadway with no weak interlayers. The deformation of the vault and two sides of the roadway is larger than that of the bottom, and roadway surrounding rocks without weak interlayers apparently have larger deformation than those with weak interlayers, and have larger deformation rate. The farther away from the explosion source, the smaller the stress and deformation of roadway surrounding rocks, but the change is not apparent, which tends to be stabilized after about 0.15 s under dynamic disturbance. Based on the investigation of Dongguashan copper mine, the destruction form of surrounding rocks is roof caving. Thus an optimized support scheme was proposed, with which the deformation of surrounding rocks is about 1/3 of that with no support, effectively reducing the deformation of roadway surrounding rocks.
[1] 王明洋, 周泽平, 钱七虎. 深部岩体的构造和变形与破坏问题[J]. 岩石力学与工程学报, 2006, 25(3): 448-455． Wang Mingyang, Zhou Zeping, Qian Qihu. Tectonic, deformation and failure problems of deep rock mass[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(3): 448-455.
[2] 何满潮, 谢和平, 彭苏萍, 等. 深部开采岩体力学研究[J]. 岩石力学与工程学报, 2005, 24(16): 2803-2813. He Manchao, Xie Heping, Peng Suping, et al. Study on rock mechanics in deep mining engineering[J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(16): 2803-2813.
[3] 李夕兵, 李地元, 郭雷, 等. 动力扰动下深部高应力矿柱力学响应研究[J]. 岩石力学与工程学报, 2007, 26(5): 922-928. Li Xibing, Li Diyuan, Guo Lei, et al. Study on mechanical response of highly-stressed pillars in deep mining under dynamic disturbance[J]. Chinese Journal of Rock Mechanics and Engineering, 2007, 26(5): 922-928.
[4] 朱万成, 左宇军, 尚世明, 等. 动态扰动触发深部巷道发生失稳破裂的数值模拟[J]. 岩石力学与工程学报, 2007, 26(5): 915-921. Zhu Wancheng, Zuo Yujun, Shang Shiming, et al. Numerical simulation of instable failure of deep rock tunnel triggered by dynamic disturbance[J]. Chinese Journal of Rock Mechanics and Engineering, 2007, 26(5): 915-921.
[5] 杨金林, 李夕兵, 周子龙, 等. 动力扰动对采空区稳定性影响的离散元分析[J]. 科技导报, 2010, 28(24): 48-52. Yang Jinlin, Li Xibing, Zhou Zilong, et al. Stability analysis of underground goaf influenced by dynamic disturbance with dimensional distinct element[J]. Science and Technology Review, 2010, 28(24): 48-52.
[6] 高富强, 高新峰, 康红普. 动力扰动下深部巷道围岩力学响应FLAC 分析[J]. 地下空间与工程学报, 2009, 5(4): 680-685. Gao Fuqiang, Gao Xinfeng, Kang Hongpu. FLAC analysis of mechanical response of surrounding rock mass in deep tunnel[J]. Chinese Journal of Underground Space and Engineering, 2009, 5(4): 680-685.
[7] 温颖远, 牟宗龙, 易恩兵, 等. 动力扰动下不同硬度煤层巷道围岩响应特征研究[J]. 采矿与安全工程学报, 2013, 30(4): 555-559. Wen Yingyuan, Mou Zonglong, Yi Enbing, et al. The response features of roadway surrounding rock in different hardness coal seams under dynamic disturbance[J]. Journal of Mining & Safety Engineering, 2013, 30(4): 555-559.
[8] 唐礼忠, 周建雄, 张君, 等. 动力扰动下深部采空区围岩力学响应及填充作用效果[J]. 成都理工大学学报: 自然科学版, 2012, 39(6): 623-628. Tang Lizhong, Zhou Jianxiong, Zhang Jun, et al. Mechanical response of deep stoped-out areas and filling effect under dynamic disturbance[J]. Journal of Chengdu University of Technology: Science & Technology Edition, 2012, 39(6): 623-628.
[9] 唐礼忠, 潘长良, 杨承祥, 等. 冬瓜山铜矿微震监测系统及其应用研究[J]. 金属矿山, 2006(10): 41-45. Tang Lizhong, Pan Changliang, Yang Chengxiang, et al. Establishment and application of microseismicity monitoring system in Donggua shan copper mine[J]. Metal Mine, 2006(10): 41-45.
[10] Brady B H G, Brown E T. Rock mechanics for underground mining[M]. Dordrecht: Springer, 2006: 166-167.
[11] 李夕兵, 廖九波, 赵国彦, 等. 动力扰动下高应力巷道围岩动态响应规律[J]. 科技导报, 2012, 30(22): 48-54. Li Xibing, Liao Jiubo, Zhao Guoyan et al. Dynamic response of surrounding rock in highly-stressed tunnel under dynamic disturbance[J]. Science and Technology Review, 2012, 30(22): 48-54.
[12] 陈国祥, 窦林名, 高明仕, 等. 动力扰动对回采巷道冲击危险的数值模拟[J]. 采矿与安全工程学报, 2009, 26(2): 153-157. Chen Guoxiang, Dou Linming, Gao Minshi, et al. Numerical simulation of dynamic vibration affecting rock burst in mining gateway caused by tremor[J]. Journal of Mining & Safety Engineering, 2009, 26 (2): 153-157.
[13] 龙源, 冯长根, 许全军, 等. 爆破地震波在岩石介质中传播特性与数值计算研究[J]. 工程爆破, 2000, 6(3): 1-7. Long Yuan, Feng Changgen, Xu Quanjun, et al. Study on propagation characteristics of blasting seismic waves in a rock medium and numerical calculation[J]. Engineering Blasting, 2000, 6(3): 1-7.
[14] 谷音, 刘晶波, 杜义欣. 三维一致粘弹性人工边界及等效粘弹性边界单元[J]. 工程力学, 2007, 24(12): 31-37. Gu Yin, Liu Jingbo, Du Yixin. 3D consistent viscous-spring artificial boundary and viscous-spring boundary element[J]. Engineering Mechanics, 2007, 24(12): 31-37.
[15] 刘晶波, 王振宇, 杜修力, 等. 波动问题中的三维时域粘弹性人工边界[J]. 工程力学, 2005, 22(6): 46-51. Liu Jingbo, Wang Zhenyu, Du Xiuli, et al. Three-dimensional viscoelastic artificial boundaries in time domain for wave motion problems[J]. Engineering Mechanics, 2005, 22(6): 46-51.
[16] Briaud J, Lim Y. Tieback walls in sand: numerical simulation and design implications[J]. Journal of Geotechnical and Geoenvironmental Engineering, 1999, 125(2): 101-110.
