断层破碎带对非发震断层场地地震动的影响
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摘要
运用动接触单元对断层场地中的非发震断层的实际运动状态进行了模拟,并结合有限元模型分析了断层场地中非发震断层对场地地震动的影响。通过计算和比较无摩擦力、有摩擦力和无断层三种工况,探讨了动接触单元模拟非发震断层的合理性。计算中还考虑了断层破碎带及断层破碎带土的一些性质,结果表明考虑断层破碎带的存在对于地震动是有影响的。同时还指出,在研究实际非发震断层对场地地震动影响时,应具体考虑场地诸因素的复杂性。
We use dynamic contact element to simulate the actual motion of the non-active fault, and analyze the effect of non-causative fault on ground motion in the fault site combining with finite element model. Through computing and comparing such three ground conditions as non-fault-friction, fault-friction and non-fault, we discuss the rationality to simulating non-causative fault with dynamic contact element. The fault fracture zone and some of its soil characters are taken into consideration in the calculation. The result shows that the fracture zone does have influence on ground motion. Meanwhile, it indicates that the complexity of related site factors should be considered comprehensively in practical study.
We use dynamic contact element to simulate the actual motion of the non-active fault, and analyze the effect of non-causative fault on ground motion in the fault site combining with finite element model. Through computing and comparing such three ground conditions as non-fault-friction, fault-friction and non-fault, we discuss the rationality to simulating non-causative fault with dynamic contact element. The fault fracture zone and some of its soil characters are taken into consideration in the calculation. The result shows that the fracture zone does have influence on ground motion. Meanwhile, it indicates that the complexity of related site factors should be considered comprehensively in practical study.
引文
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[2]刘书,刘晶波,方鄂华.动接触问题及其数值模拟的研究进展[J].工程力学,1999,16(6):14-28.
[3]KohnkeP.ANSYSTheoryRelease5.7[M].Southpointe:Ansy Inc,2001,14-186.
[4]宋战平,李宁,陈燕飞.高拱坝—坝基系统的三维静力非线性数值分析[J].西安建筑科技大学学报,2003,35(4):334-338,342.
[5]丁能根.斜齿轮三角有限元网格和接触单元的自动生成[J].合肥工业大学学报(自然科学版),2003,26(5):1094-1097.
[6]陈开旭,安关峰,鲁亮.采用有厚度接触单元对桩基沉降的影响[J].岩土力学,2000,21(1):92-96.
[7]孙若昧.地震波传播有限元差分模拟的人工边界问题[J].地球物理学进展,1996,11(3):53-58.
[8]LiaoZP,WangHL,YangBP,etal.ATransmittingBoundary forTransientWaveAnalysis[J].ScientiaSinica(SeriesA),1984,27(10):1063-1067.
[9]李仕栋,罗奇峰.非活动隐伏断层对结构地震反应的影响[J].自然灾害学报,2003,12(4):25-28.
[10]温瑞智,周正平,孙平善,等.断层场地地震动分析[J].地震工程与工程振动,2002,22(1):21-27.
[11]石玉成,陈丙午.非发震断层的地震效应问题[J].西北地震学报,1994,16(1):12-20.
[12]王明洋,杨林德,钱七虎.缓倾角断裂隔震效应的定量研究[J].同济大学学报,1999,27(1):34-37.
[13]曹炳政,罗奇峰.浅层断层对场地地震动影响的有限元分析[J].地震学报,2003,25(1):96-100.
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