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| 1 | SV波入射情况下V型河谷地形对地震动的影响分析显示文摘基于局部人工边界的显式有限元方法,给出了二维V型河谷地形在SV波垂直入射下地面运动数值解,并分析其地震动分布规律以及两侧不同的边坡角度对于地震动分布规律的影响。数值结果表明:谷底的角点、两岸靠近河谷的点、两侧谷坡靠近谷底的点以及靠近两岸的点,对地表位移有放大作用,而对其邻近区域地表位移有抑制作用。这是由于角点处存在面的相交和转化,使角点处和角点附近波的散射更为复杂,故波形转换更加强烈,并且以其为中心有一定的影响区域,越靠近这些角点波形转换越为强烈。峰值结果、传递函数结果和观测点质点运动轨迹结果都显示了这一规律。整体而言,右岸和右坡坡顶附近波形转换要比左岸明显得多,且对应两侧河岸相同的X向位移峰值,左侧河岸的影响范围要比右侧的影响范围大,这可能是因为右坡坡度更大导致波形转换要更强所致。两侧河岸质点运动轨迹最终都呈现逆进运动轨迹,有些观测点的逆进椭圆轨迹较明显,这可能是由于在河岸处SV波转换成面波所致。 | 刘必灯 周正华 刘培玄 李小军 王伟 | 2011 | 地震工程与工程振动2011，31，2： | 10 |
| 2 | Dynamic response of an alluvial valley consists of three types of soil显示文摘Dynamic response of an alluvial valley consisting of three different types of soil was studied.In the twodimensional model,the alluvial valley was assumed to have half-cylindrical shape.The alluvial valley contained three different types of soil with different shapes.The valley was surrounded by a half-space.All of the soil types and the half-space were assumed to be isotropic,homogeneous and linear elastic.The half-space was excited by simple harmonic SH-waves radiated from a strike-slip fault.The fault was assumed to have circular-arc shape in the mathematical model.The governing equations were solved by using wave function expansion method where boundary conditions were relatively simple.In the regions where boundary conditions were more complex,finite difference method was employed.Consequently,the wave propagation problem was solved semi-analytically.The obtained numerical results showed that surface displacement amplitudes are significantly affected by the material properties of the different soil types of the alluvial valley.It was also observed that the shapes of the soil types in the alluvial valley played a considerable role in surface displacements. | Hasan Faik Kara | 2020 | Earthquake Engineering and Engineering Vibration2020，19，2： | 0 |
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