下扬子区皖南地区含油气系统分析

利用BASIMS盆地模拟软件，通过对下扬子区皖南地区的盆地模拟研究，对该区从纵向上划分出三套含油气系统，并对这三套含油气系统从烃源（晚期生烃）、晚期成藏、有效保存三个关键因素出发，通过三套含油气系统四个关键时刻的平面评价分析，评选出有利勘探地区，主要上古生界及中新生界保存较好的地区：宣州－南陵、芜湖、潜山－望江和休宁四个地区。     

圆弧状多层沉积谷地在平面SV波入射下的动力响应

利用波函数的Fourier-Bessel级数展开法,推导出了含任意多个圆弧状沉积层的谷地在平面SV波入射下稳态动力响应的解析解,并分析了该级数形式的解析解随着截断项数的收敛问题.其结果表明,该级数解能够在一个非常宽的频带范围内收敛;通过在简化条件下与现有其他解析解的比较,验证了该解析解的正确性;并利用该解析解,以稳态地面运动的位移幅值和相位差为基本参数,在一个较宽的频带范围内讨论了谷地中沉积介质的成层性对地面运动的影响,其结果表明对于多层谷地而言,当入射波频率较高时,散射波之间的干涉显著并且出现了能量聚焦现象.     

基于局部斜率属性的VSP波场分离研究

基于垂直地震剖面(VSP)资料中上、下行波视速度的差异,利用地震剖面同相轴局部斜率属性参数,提出了一种分离上、下行波场的新方法.首先利用Fourier变换初步分离上、下行波场,然后利用平面波分解滤波器(Plane Wave Destruction (PWD) Filter)技术估计初始分离波场的同相轴局部斜率属性参数,在此基础上对VSP原始资料波场分离.该方法是一种时间域最小平方优化分离波场的方法,不存在其他滤波方法阈值滤波器边界的影响,减少了因镶边问题带来的假象.模拟和实际资料处理结果表明,该方法与传统方法相比,分离出的上、下行波噪声假象少,振幅保持好,更好地消除了上、下行波的相互影响.     

圆弧状凹陷地形对平面P波的散射:高频解答

利用波函数的Fourier-Bessel级数展开,推导了具有不同深宽比的圆弧状凹陷地形对入射平面P波二维散射问题的解析解.与现有解析解不同之处在于,为了使该解析解适用于更高的入射波频率,本文利用了柱函数的渐进性质,使得散射波的待定系数可以直接确定,避免了线性方程组的求解以及相关的数值计算问题,从而拓展了该解析解适用的频带范围.通过与现有解析解的比较,论证了该解析解的正确性,进而在一个较宽的频带范围内分析了圆弧状凹陷地形对入射平面P波的散射效应.     

圆弧状凹陷地形对平面SV波散射问题的宽频带解析解

利用波函数的Fourier-Bessel级数展开法,推导了具有不同深宽比的圆弧状凹陷地形对入射平面SV波二维散射问题的解析解。区别于现有其他解析解,利用柱函数的渐近性质,使得散射波的待定系数得以直接确定,避免了线性方程组的求解以及相应的高频波入射下的数值计算问题,从而拓展了解析解适用的频带范围。通过与已有解析解的比较论证了该解析解的正确性,并在一个较宽的频带范围内研究了圆弧状凹陷地形对入射平面SV波的散射效应。     

动力地貌过程与分形研究：以元谋盆地为例

文章认为动力地貌过程是个动态系统，处于混沌态，分形无处不在。为更好地进行地貌分形研究，作者引进复变函数和复平面作为计算机分形模拟的理论基础。该研究主要是在元谋盆地进行，作者在广泛野外勘测和室内计算机工作站精密跟踪、分析计算的基础上，提出元谋土林发育过程的复变函数表达式，并对其进行深入细致的分析模拟工作，得出部分形参意义，与地貌实体进行对照比较，结果较为理想。最后，文章反省该研究的缺陷与不足，提出存在的问题和今后的研究方向。     

斜入射平面SH波在层状半空间中沉积谷地周围的三维散射

The indirect boundary element method （IBEM） is used to study three-dimensional scattering of obliquely incident plane SH waves by an alluvial valley embedded in a layered half-space. The free-field response of the layered half-space is calculated by the direct stiffness method, and dynamic Green＇s functions of moving distributed loads acting on inclined lines in a layered half-space are calculated to simulate the scattering wave field. The presented method yields very accurate results since the three-dimensional dynamic stiffness matrix is exact and the moving distributed loads can act directly on the valley boundary without singularity. Numerical results and analyses are performed for amplification of obliquely incident plane SH waves around an alluvial valley in a uniform half-space and in single layer over half-space. The results show that the three-dimensional responses are distinctly different from the two-dimensional responses, and the displacement amplitudes around alluvial valleys in a uniform haft-space are obviously different from those in a layered half-space.     

瞬态面波在隧道工程滑坡处治中应用一例

结合工程实例,介绍隧道工程设计施工过程中利用瞬态面波勘探技术,可确定滑坡体的覆盖范围及基岩埋深,是高效、经济探查、处治方法。     

Vertical dynamic response of an inhomogeneous viscoelastic pile

The vertical dynamic response of an inhomogeneous viscoelastic pile embedded in layered soil subjected to axial loading has been investigated. The interaction between pile and soil is simulated by a general Voigt model, one that has been demonstrated by earlier investigators to be capable of representing the plane strain case of soil adequately. The analytical solutions of pile responses in the frequency domain are obtained by using the (two-sided) Laplace transform. The corresponding semi-analytical solutions in the time domain for the case of a pile subjected to an instantaneous half-sine exciting force applied at the pile top are obtained via Fourier transform inversion. Using these solutions, a parametric study of the influence of the pile and soil properties on the vertical dynamic responses has been undertaken. It is shown that an abrupt variation of the soil properties with depth cannot yield evident reflection signal that may lead geotechnical engineers to assess the pile integrity wrongly from the velocity curve of the pile top, and the influence of viscosity of the pile material on the response is different from that of the damping of the soil surrounding the pile. The theoretical model developed in the present paper has also been validated in field studies, where it is shown by means of three examples that the solution developed in this study has been adequately verified by comparison of the theoretical pile model and field measurements of the dynamic responses.