大跨度地下洞库爆炸荷载下破坏形态试验研究
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摘要
为分析不同药量的钻地武器爆炸对大跨度地下洞库产生的破坏效应,采用模型试验的方法对大跨度地下洞库的抗爆性能进行了分析研究,获得了不同爆炸荷载作用下洞库周边及衬砌的压力、加速度和位移的分布规律,并对比分析了围岩及洞室的整体破坏情况。试验结果表明:随着爆炸药量的增加,测点压力、加速度和位移的峰值基本均呈增大趋势,且相同测点位移峰值增大最明显;当爆炸药量增大时,先在洞室拱顶出现影响结构安全的纵向裂缝,且随着爆炸药量的继续增加,地下洞室裂缝的部位和数量逐渐增多、宽度逐渐加大,洞室衬砌甚至出现掉落现象;洞室拱顶围岩自两侧拱脚至爆心均出现了"八"字形的裂缝,且随着爆炸药量的增加,裂缝的宽度逐渐加大,甚至出现了拱顶围岩整体塌落的现象。其论文研究成果可为大跨度地下防护工程的抗力评估提供参考。
To analyze the damaged effects of large-span underground caverns under different blast loading of penetration weapons,the blast resistance of them were researched by model tests based on the theory of similarity. The pressure,acceleration and displacement response principle of surrounding rock and lining under different blast loading were obtained,the overall damage effect of surrounding rock and cavern was comparative analysised also. The test results show that: The pressure,acceleration and displacement peak values increases as the blast loading increases and the displacement peak values of same testing position increased significantly. When the explosive load increases,in the cave vault appears longitudinal cracks firstly which will affect the structural safety. And with the explosive energy continues to increase,the location and number of cracks in the underground caverns gradually increased,the width of cracks gradually increased also. Cave lining even appears drop phenomenon. The surrounding rock from the side of the arch to the heart of the explosion appeared"Chinese character eight"shaped cracks,and with the increase of the explosive load,the width of the crack increases gradually and even the collapse of the surrounding rock. The study can provide references to the resistance assessment of large-span underground protective projects.
To analyze the damaged effects of large-span underground caverns under different blast loading of penetration weapons,the blast resistance of them were researched by model tests based on the theory of similarity. The pressure,acceleration and displacement response principle of surrounding rock and lining under different blast loading were obtained,the overall damage effect of surrounding rock and cavern was comparative analysised also. The test results show that: The pressure,acceleration and displacement peak values increases as the blast loading increases and the displacement peak values of same testing position increased significantly. When the explosive load increases,in the cave vault appears longitudinal cracks firstly which will affect the structural safety. And with the explosive energy continues to increase,the location and number of cracks in the underground caverns gradually increased,the width of cracks gradually increased also. Cave lining even appears drop phenomenon. The surrounding rock from the side of the arch to the heart of the explosion appeared"Chinese character eight"shaped cracks,and with the increase of the explosive load,the width of the crack increases gradually and even the collapse of the surrounding rock. The study can provide references to the resistance assessment of large-span underground protective projects.
引文
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[8]徐干成,顾金才,袁伟泽,等.洞室围岩交叉锚固结构抗爆性能模型试验研究[J].地下空间与工程学报,2014,10(5):1078-1085.(Xu Gancheng,Gu Jincai,Yuan Weize,et al. Model test study on explosive resistance of intercross bolted rock mass structure in underground space[J]. Chinese Journal of underground space and Engineering,2014,10(5):1078-1085.(in Chinese))
[9]杨自友,顾金才,陈安敏,等.爆炸波作用下锚杆间距对围岩加固效果影响的模型试验研究[J].岩石力学与工程学报,2008,27(4):757-764.(Yang Ziyong, Gu Jincai, Chen Anmin. et al. Model experiment study on the reinforcement sffects of intervals of rock bolts in wall rock under the effect of explosive waves[J]. Chinese Journal of Rock Mechanics and Engineering,2008,27(4):757-764.(in Chinese))
[10]杨苏杭,梁斌,顾金才,等.锚固洞室抗爆模型试验锚索预应力变化特性研究[J].岩石力学与工程学报,2005,25(增2):3749-3756.(Yang Suhang,Liang Bin,Gu Jincai,et al. Research on characteristics of prestress change of anchorage cable anti-explosion model test of anchored cavern[J]. Chinese Journal of Rock Mechanics and Engineering,2005,25(Supp.2):3749-3756.(in Chinese))
[11]徐干成,袁伟泽,顾金才,等.地下洞库围岩外加固抗炸弹爆炸性能研究[J].岩石力学与工程学报,2015, 34(9):1767-1776.(Xu Gancheng, Yuan Weize,Gu Jincai,et al. Explosive resistivity research on anchored cavern surface rock[J]. Chinese Journal of Rock Mechanics and Engineering,2015,34(9):1767-1776.(in Chinese))
[2] Charles E J,George S. Rubin D B. Brick model tests of shallow underground magazines[M]. Department of the Army Waterways Experiment Station Corps of Engineers,March,1992.
[3] Rajmeny P K,Singhb U K,Sinha B K P. Predicting rock failure around boreholes and drives adjacent to stops in Indian mines in high stress regions[J].International Journal of Rock Mechanies&Mining Sciences,2002,39(2):151-164.
[4] Singh P K. Blast vibration damage to underground coal mines from adjacent open-pit blasting[J]. International Journal of Rock Mechanics&Mining Sciences,2002,39(8):959-973.
[5]陈剑杰,孙钧,林俊德,等.强爆炸应力波作用下岩石地下洞室的破坏现象学[J].解放军理工大学学报,2007,8(6):582-588.(Chen Jianjie,Sun Jun,Lin Junde, et al. Failure of rock openings under intensive explosion stress wave[J]. Journal of PLA University of Science and Technology,2007,8(6):582-588.(in Chinese))
[6]杨自友.锚固洞室的抗爆性能研究[D].合肥:中国科学技术大学,2008.(Yang Ziyou. Study on the antidetonating characteristics of underground opening reinforced by rock bolts[D]. Hefei:University of Science and Technology of China,2008.(in Chinese))
[7]徐景茂,顾金才,陈安敏,等.拱脚局部加长锚杆锚固洞室抗爆模型试验研究[J].岩石力学与工程学报,2012,31(11):2182-2186.(Xu Jingmao,Gu Jincai,Chen Anmin,et al. Model test study of antiexplosion capacity of anchored tunnel with local lengthening anchors in arch springing[J]. Chinese Journal of Rock Mechanics and Engineering,2012,31(11):2182-2186.(in Chinese))
[8]徐干成,顾金才,袁伟泽,等.洞室围岩交叉锚固结构抗爆性能模型试验研究[J].地下空间与工程学报,2014,10(5):1078-1085.(Xu Gancheng,Gu Jincai,Yuan Weize,et al. Model test study on explosive resistance of intercross bolted rock mass structure in underground space[J]. Chinese Journal of underground space and Engineering,2014,10(5):1078-1085.(in Chinese))
[9]杨自友,顾金才,陈安敏,等.爆炸波作用下锚杆间距对围岩加固效果影响的模型试验研究[J].岩石力学与工程学报,2008,27(4):757-764.(Yang Ziyong, Gu Jincai, Chen Anmin. et al. Model experiment study on the reinforcement sffects of intervals of rock bolts in wall rock under the effect of explosive waves[J]. Chinese Journal of Rock Mechanics and Engineering,2008,27(4):757-764.(in Chinese))
[10]杨苏杭,梁斌,顾金才,等.锚固洞室抗爆模型试验锚索预应力变化特性研究[J].岩石力学与工程学报,2005,25(增2):3749-3756.(Yang Suhang,Liang Bin,Gu Jincai,et al. Research on characteristics of prestress change of anchorage cable anti-explosion model test of anchored cavern[J]. Chinese Journal of Rock Mechanics and Engineering,2005,25(Supp.2):3749-3756.(in Chinese))
[11]徐干成,袁伟泽,顾金才,等.地下洞库围岩外加固抗炸弹爆炸性能研究[J].岩石力学与工程学报,2015, 34(9):1767-1776.(Xu Gancheng, Yuan Weize,Gu Jincai,et al. Explosive resistivity research on anchored cavern surface rock[J]. Chinese Journal of Rock Mechanics and Engineering,2015,34(9):1767-1776.(in Chinese))