地下工程改扩建中施工爆破对衬砌危害的三维数值模拟研究
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摘要
应用LS-DYNA3D软件对某地下工程改扩建中施工爆破作业进行了三维数值模拟,分析了围岩与衬砌中爆炸应力波的传播特征,指出了原有洞室混凝土衬砌的破坏主要为施工爆破诱发的反射拉伸波使衬砌拉应力超过混凝土抗拉强度所导致拉裂破坏,且破损现象主要发生在洞室的侧墙部位,为控制衬砌破损的进一步发展,建议采用台阶法开挖,计算表明台阶法开挖能明显改善衬砌拉应力水平和质点振速。
Drilling-blasting excavation for underground cavern enlarging is simulated and analyzed by using the LS-DYNA 3D software.The characteristics of the propagation of stress wave in rock stratum and lining under explosive loading are analyzed.The results of numerical simulating indicate that reflecting tensile wave directly results in concrete lining fracture owing to tensile stress over the tensile strength of concrete and the damage usually locates in lining wall.It is also demonstrated that steps excavation method is better than full section excavatio because of decreasing the lining tensile stress and particle vibration velocity.
Drilling-blasting excavation for underground cavern enlarging is simulated and analyzed by using the LS-DYNA 3D software.The characteristics of the propagation of stress wave in rock stratum and lining under explosive loading are analyzed.The results of numerical simulating indicate that reflecting tensile wave directly results in concrete lining fracture owing to tensile stress over the tensile strength of concrete and the damage usually locates in lining wall.It is also demonstrated that steps excavation method is better than full section excavatio because of decreasing the lining tensile stress and particle vibration velocity.
引文
[1]耿永常.地下空间建筑与防护结构[M].哈尔滨:哈尔滨工业大学出版社,2005.
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[9]Daniel J L,Krauthammer T.Assessment of numerical simula-tion capabilities for medium-structure interaction systems under explosive loads[J].Computers and Structures,1997,63(5):875—887.
[10]言志信,王永和,江平,王后裕.爆破地震测试及建筑结构安全标准研究[J].岩石力学与工程学报.2003,22(11):1907—1911.
[2]Eaylot J T.Effect of soil flowchanges on structure loads[J],Journal of Structural Engineering.2000,126(10):1434—1441.
[3]Thabet A,Haldane D.Three-dimensional numerical simula-tion of the behavior of standard concrete test specimens whensubjected to impact loading[J].Computers and Structures.2001,79(1):21—31.
[4]李欢秋,卢芳云,吴祥云,赵玉祥,任辉启.应力波在有地下复合结构的岩石介质中传播规律的研究[J].岩石力学与工程学报.2003,22(11):1832—1836.
[5]赵以贤,王良国.爆炸载荷作用下地下拱形结构动态分析[J].爆炸与冲击.1995,15(3):201—211.
[6]Livermore Software Technology Corporation.LS-DYNA Key-word User’s Manual(970v)[M].Livermore,2003.
[7]杨军,金乾坤,黄风雷.岩石爆破理论模型及数值计算[M].北京:科学出版社,1999.
[8]龚自明,方秦,柳锦春,余强.混凝土靶体尺寸及边界约束对侵彻深度影响的数值研究[J].防护工程.2004,26(6):50—57.
[9]Daniel J L,Krauthammer T.Assessment of numerical simula-tion capabilities for medium-structure interaction systems under explosive loads[J].Computers and Structures,1997,63(5):875—887.
[10]言志信,王永和,江平,王后裕.爆破地震测试及建筑结构安全标准研究[J].岩石力学与工程学报.2003,22(11):1907—1911.
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