Simulated experiment of disturbance effect on crack defects of adjacent tunnel under dynamic and static load
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摘要: 为了探究动静组合应力场作用下邻近巷道背爆侧裂纹缺陷的扩展规律，采用动静加载透射式动态焦散线方法进行了模拟实验，并结合裂纹尖端的动态应力强度因子和能量释放率进行了分析。实验结果表明：在动静荷载作用下，邻近巷道背爆侧裂纹缺陷处也成为巷道主要扰动区，且爆炸荷载对背爆侧预制裂纹的起裂起主导作用；p=0.2 MPa时的相同动静组合应力场中，背爆侧预制裂纹的扩展位移差异与裂纹的倾角有关，当θ=75°时，爆炸应力波无法驱动裂纹起裂；在相同爆炸荷载作用下，θ=30°时，较小竖向荷载对裂纹的扩展具有抑制作用，且抑制作用随所施加的竖向荷载增加而增大，当p=0.4 MPa时，裂纹无法起裂；裂纹最终扩展位移，与裂纹尖端动态应力强度因子在极大值上下振荡变化的持续时间，或在裂纹扩展阶段能量释放率积累量，呈正相关。Abstract: To explore the mechanism of crack expansion in the adjacent tunnel under the influence of the combined stress field, a simulated experiment was carried out adopting the blast loading and static loading transmission of the dynamic caustics, and the result was analyzed combined with dynamic stress intensity factors and the energy release rate of the crack tip. The experimental results show that the region where cracks are located in the back-blast side of the adjacent model-tunnel is also the main disturbance zone of the tunnel and that the explosion load plays a leading role in inducing crack initiation in the combined stress field formed by the less vertical pressure and the explosion load. In the same combined stress field, with p=0.2 MPa, the prefabricated crack extension displacement is associated with the angle of the crack and, with θ=75°, the explosive stress wave cannot induce crack initiation. Under the effect of the same explosive stress wave, with θ=30°, the less vertical stress within a certain range has an inhibitory effect on the propagation of the crack, and this effect increases with the vertical pressure increase applied in the neighboring roadway. With p=0.4 MPa, the crack cannot induce crack initiation. Eventually the displacement of an extended crack occurred, which is positively correlated with the duration time of the dynamic stress intensity factor around its maximal value or with the accumulated value of the energy release rate in the stage of the crack propagation. The results of the present study will have a guiding significance for practical engineering in mining industry.
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图 2 透射式焦散线实验系统光路
Figure 2. Schematic diagram of transmission caustics experimental system
图 4 动静荷载应力场中倾角变化时的实验结果
Figure 4. Experimental results when the dip angle changes in the dynamic and static stress field
图 6 静荷载应力场中倾角变化时的裂纹扩展
Figure 6. Crack propagation when the dip angle changesin the dynamic and static stress field
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[1] 姚建国.中国矿业可持续发展与煤矿开采环境问题[J].岩土力学, 2003, 24(增刊):633-635. http://d.old.wanfangdata.com.cn/Conference/6735992Yao Jianguo. Sustainable development of China's mining industry and environmental pollution problem in coal mining[J]. Rock and Soil Mechanics, 2003, 24(Suppl):633-635. http://d.old.wanfangdata.com.cn/Conference/6735992 [2] 贺永年, 韩立军, 邵鹏, 等.深部巷道稳定性的若干岩石力学问题[J].中国矿业大学学报, 2006, 35(3):288-295. doi: 10.3321/j.issn:1000-1964.2006.03.002He Yongnian, Han Lijun, Shao Peng, et al. Some problems of rock mechanics for roadways stability in depth[J]. Journal of China University of Mining & Technology, 2006, 35(3):288-295. doi: 10.3321/j.issn:1000-1964.2006.03.002 [3] 蔚立元, 李术才, 徐帮树.舟山灌门水道海底隧道钻爆法施工稳定性分析[J].岩土力学, 2009, 30(11):3453-3459. doi: 10.3969/j.issn.1000-7598.2009.11.039Yu Liyuan, Li Shucai, Xu Bangshu. Stability analysis of Zhoushan subsea tunnel with drill-and-blast construction method[J]. Rock and Soil Mechanics, 2009, 30(11):3453-3459. doi: 10.3969/j.issn.1000-7598.2009.11.039 [4] 盖秉政.论弹性波绕射与动应力集中问题[J].力学进展, 1987, 17(4):447-465. http://www.cnki.com.cn/Article/CJFDTOTAL-LXJZ198704001.htmGai Bingzheng. The discuss of elastic wave diffraction and dynamic stress concentration problem[J]. Journal of Mechanics, 1987, 17(4):447-465. http://www.cnki.com.cn/Article/CJFDTOTAL-LXJZ198704001.htm [5] 刘殿魁, 盖秉政, 陶贵源.论孔附近的动应力集中[J].地震工程与工程振动, 1980, 1(1):97-109. http://d.old.wanfangdata.com.cn/Periodical/ytlx201203039Liu Diankui, Gai Bingzheng, Tao Guiyuan. The dynamic stress concentrations thoery near the hole[J]. Earthquake Engineering and Engineering Vibration, 1980, 1(1):97-109. http://d.old.wanfangdata.com.cn/Periodical/ytlx201203039 [6] 谭忠盛, 杨小林, 王梦恕.复线隧道施工爆破对既有隧道的影响分析[J].岩石力学与工程学报, 2003, 22(2):281-285. doi: 10.3321/j.issn:1000-6915.2003.02.023Tan Zhongsheng, Yang Xiaolin, Wang Mengshu. Effect of blast in double line tunnel on existing tunnel[J]. Chinese Journal of Rock Mechanics and Engineering, 2003, 22(2):281-285. doi: 10.3321/j.issn:1000-6915.2003.02.023 [7] 李宁, 顾强康, 张承客.相邻洞室爆破施工对已有洞室的影响[J].岩石力学与工程学报, 2009, 28(1):31-38. doi: 10.3321/j.issn:1000-6915.2009.01.004Li Ning, Gu Qingkang, Zhang Chengke. Influence of blasting on excavation of a new tunnel adjacent to existing tunnel[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(1):30-38. doi: 10.3321/j.issn:1000-6915.2009.01.004 [8] 李宁, 张承客, 周钟.边坡爆破开挖对邻近已有洞室影响研究[J].岩石力学与工程学报, 2012, 31(2):3471-3477. http://d.old.wanfangdata.com.cn/Conference/7895588Li Ning, Zhang Chengke, Zhou Zhong. Influence research of slope blasting excavation on adjacent existed tunnel[J]. Chinese Journal of Rock Mechanics and Engineering, 2012, 31(2):3471-3477. http://d.old.wanfangdata.com.cn/Conference/7895588 [9] 彭道富, 李忠献, 杨年华.近距离爆破对既有隧道的振动影响[J].中国铁道科学, 2005, 26(4):73-76. doi: 10.3321/j.issn:1001-4632.2005.04.015Peng Daofu, Li Zhongxian, Yang Nianhua. Vibration effect at existing tunnel Induced by close-in blasting[J]. China Railway Science, 2005, 26(4):73-76. doi: 10.3321/j.issn:1001-4632.2005.04.015 [10] 吴亮, 钟冬望.不同布置条件下邻近隧道掘进爆破对既有隧道的影响[J].煤炭学报, 2009, 34(10):1339-1343. doi: 10.3321/j.issn:0253-9993.2009.10.008Wu Liang, Zhong Dongwang. Effect of tunneling blasting on the existing adjacent tunnel under different conditions[J]. Journal of China Coal Society, 2009, 34(10):1339-1343. doi: 10.3321/j.issn:0253-9993.2009.10.008 [11] 钟冬望, 吴亮, 余刚.邻近隧道掘进爆破对既有隧道的影响[J].爆炸与冲击, 2010, 30(5):456-462. doi: 10.11883/1001-1455(2010)05-0456-07Zhong Dongwang, Wu Liang, Yu Gang. Effect of tunneling blasting on the existing adjacent tunnel[J]. Explosion and Shock Waves, 2010, 30(5):456-462. doi: 10.11883/1001-1455(2010)05-0456-07 [12] 王志亮, 李永池.防护层中孔穴对轴向应力波的绕射屏蔽效应研究[J].岩土力学, 2005, 26(8):1221-1226. doi: 10.3969/j.issn.1000-7598.2005.08.008Wang Zhiliang, Li Yongchi. Study on diffracting and screening effects of cavities on axial stress waves in defense layer[J]. Rock and Soil Mechanics, 2005, 26(8):1221-1226. doi: 10.3969/j.issn.1000-7598.2005.08.008 [13] 穆朝民, 齐娟.地下防护层中空穴形状对爆炸波衰减作用的影响[J].岩土力学, 2011, 32(12):3773-3779. doi: 10.3969/j.issn.1000-7598.2011.12.039Mu Chaomin, Qi Juan. Attenuation effects of cavity shape on blast wave in underground defense layer[J]. Rock and Soil Mechanics, 2011, 32(12):3773-3779. doi: 10.3969/j.issn.1000-7598.2011.12.039 [14] 郭东明, 杨仁树, 刘康, 等.一种用于模拟深部巷道爆破诱发灾害的实验系统: 中国, 201320510459.7[P].2014-02-05. [15] 王蒙, 朱哲明, 曾利刚.巷道周边裂纹应力强度因子的实验研究[J].四川大学学报, 2012, 44(1):99-103. http://www.cnki.com.cn/Article/CJFDTOTAL-SCLH2012S1017.htmWang Meng, Zhu Zheming, Zeng Ligang. The actual studies about stress intensity factor of crack surrounding roadway[J]. Journal of Sichuan University, 2012, 44(1):99-103. http://www.cnki.com.cn/Article/CJFDTOTAL-SCLH2012S1017.htm [16] 杨立云, 杨仁树, 许鹏, 等.初始应力场对爆生裂纹行为演化效应的实验研究[J].煤炭学报, 2013, 38(3):404-410. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=mtxb201303009Yang Liyun, Yang Renshu, Xu Peng, et al. Experimental study on the effect of initial compression stress field on blast-induced crack behaviors[J]. Journal of China Coal Society, 2013, 38(3):404-410. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=mtxb201303009 [17] Freund L B. Dynamic fracture mechanics[M]. Edinburgh: Cambridge University Press, 1990. [18] 杨仁树, 杨立云, 岳中文, 等.数字激光动态焦散线实验方法和系统: 中国, 201110366309.9[P].2012-07-04. [19] 胡荣, 朱哲明, 胡哲源, 等.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):1477-1481. http://d.old.wanfangdata.com.cn/Periodical/yslxygcxb201307024 -
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