爆破振动作用下东江拱坝动力响应的数值模拟
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摘要
爆破开挖引起的振动对近区水工建筑物的影响是事关工程安全的重大问题。以东江水电站为工程背景,基于LS-DYNA数值软件,模拟爆破开挖下拱坝的动力响应。对以大坝为中心的整体三维模型进行模态分析,确定阻尼系数;在爆源施加等效三角形近似荷载,计算过程中记录模型关键部位测点的振动速度时程曲线,以此来评价坝体的动力响应。结果表明:爆破振动作用下,坝体关键部位的振动速度都在控制标准内,拱坝能够安全运行。
The vibration caused by blasting has significant impact on the hydraulic structures nearby,therefore it is of great importance to the safety of the whole project. The dynamic response of the Dongjiang Arch Dam under blasting vibration effect is analyzed with the LS-DYNA software. After the construction of a whole three-dimensional model of the arch dam,a modal analysis is conducted to specify the damping coefficient. Then,an approximately equivalent triangle force is applied to the blasting source. Velocity history of several critical monitoring points is calculated,which is then used to evaluate the dynamic response of the dam. Results show that the vibration velocity of the critical parts in the arch dam is all under the controlling criteria,and the dam can operate safely.
The vibration caused by blasting has significant impact on the hydraulic structures nearby,therefore it is of great importance to the safety of the whole project. The dynamic response of the Dongjiang Arch Dam under blasting vibration effect is analyzed with the LS-DYNA software. After the construction of a whole three-dimensional model of the arch dam,a modal analysis is conducted to specify the damping coefficient. Then,an approximately equivalent triangle force is applied to the blasting source. Velocity history of several critical monitoring points is calculated,which is then used to evaluate the dynamic response of the dam. Results show that the vibration velocity of the critical parts in the arch dam is all under the controlling criteria,and the dam can operate safely.
引文
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[2]何蕴龙,刘俊林,熊堃.汶川地震冶勒大坝动力响应规律分析[J].四川大学学报:工程科学版,2009(3):157-164
[3]曹孝君,张继春,吕和林.频率对爆破地震作用下结构的动力响应的影响研究[J].爆破,2006,23(2):14-19
[4]何姣云,吴新霞,钱胜国.大坝爆破地震的动力响应计算[J].爆破,2002,19(4):1-3
[5]陈占军,朱传云,周小恒.爆破荷载作用下岩石边坡动态响应的FLAC3D模拟研究[J].爆破,2005,22(4):8-13
[6]曹攀,颜事龙,倪磊,等.基于UDEC岩体爆炸应力波衰减规律的研究[J].爆破,2014,31(1):42-46
[7]杨建华,卢文波,陈明,等.岩石爆破开挖诱发振动的等效模拟方法[J].爆炸与冲击,2012,32(2):157-163
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