共查询到12条相似文献,搜索用时 0 毫秒
1.
Static deformation of two monoclinic elastic half-spaces in welded contact due to a long inclined strike-slip fault situated
in one of the half-spaces is studied analytically and numerically. Closed-form algebraic expressions for the displacement
at any point of the medium are obtained. The variation of the displacement at the interface with the horizontal distance from
the fault is studied. The effect of anisotropy on the displacement field is examined. It is found that while the anisotropy
of the source half-space has a significant effect on the displacement at the interface, the anisotropy of the other half-space
has only a marginal effect. 相似文献
2.
The calculation of the deformation caused by shear and tensile faults is necessary for the investigation of seismic and volcanic
sources. The solution of the two-dimensional problem of a long inclined shear fault in two welded half-spaces is well known.
The purpose of this note is to present the corresponding solution for a tensile fault. Closed-form analytical expressions
for the Airy stress function for a tensile line source in two welded half-spaces are first obtained. These expressions are
then integrated analytically to derive the Airy stress function for a long tensile fault of arbitrary dip and finite width.
Closed-form analytical expressions for the displacements and stresses follow immediately from the Airy stress function. These
expressions are suitable for computing the displacement and stress fields around a long inclined tensile fault near an internal
boundary. 相似文献
3.
The solution of two-dimensional problem of an interface breaking long inclined dip-slip fault in two welded half-spaces is
well known. The purpose of this note is to obtain the corresponding solution for a blind fault. The solution is valid for
arbitrary values of the fault-depth and the dip angle. Graphs showing the variation of the displacement field with the distance
from the fault, for different values of fault depth and dip angle are presented. Contour maps showing the stress field around
a long dip-slip fault are also obtained 相似文献
4.
5.
An analytical solution of the plane strain problem of the deformation of a homogeneous, isotropic, poroelastic layer of uniform thickness overlying a homogeneous, isotropic, elastic half‐space due to two‐dimensional seismic sources buried in the elastic half‐space has been obtained. The integral expressions for the displacements, stresses and pore pressure have been obtained using the stress function approach by applying suitable boundary conditions at the free surface and the interface. The solution obtained is in the Laplace–Fourier transform domain. The case of a vertical dip‐slip line dislocation for the oceanic crust model of Earth is studied in detail. Schapery's formula is used for the Laplace inversion and the extended Simpson's formula for the Fourier inversion. Diffusion of pore pressure in the layer is studied numerically. Contour maps showing the pore pressure in the poroelastic layer have been plotted. The effect of the compressibility of the solid and fluid constituents on pore pressure has also been studied. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
6.
The solution of static elastic deformation of a homogeneous, orthotropic elastic uniform half-space with rigid boundary due to a non-uniform slip along a vertical strike-slip fault of infinite length and finite width has been studied. The results obtained here are the generalisation of the results for an isotropic medium having rigid boundary in the sense that medium of the present work is orthotropic with rigid boundary which is more realistic than isotropic and the results for an isotropic case can be derived from our results. The variations of displacement with distance from the fault due to various slip profiles have been studied to examine the effect of anisotropy on the deformation. Numerically it has been found that for parabolic slip profile, the displacement in magnitude for isotropic elastic medium is greater than that for an orthotropic elastic half-space, but, in case of linear slip, the displacements in magnitude for an orthotropic medium is greater than that for the isotropic medium. 相似文献
7.
利用Muki和Sternberg的虚拟桩法,研究了饱和土体地基中排桩对移动荷载引起振动的被动隔振效果。隔振桩作为一维杆,饱和土体满足Biot理论。利用已有的移动荷载作用下的饱和土体的自由波场解及饱和土体内部受竖向圆形分布荷载作用下的基本解,建立了频域内土-桩的第2类Fredholm积分方程。通过Fourier逆变换得到时间域内评价隔振效果的振幅比。与已知文献结果相比较,验证了方法的正确性。数值结果表明,荷载速度对排桩的隔振效果有一定影响,即在相同隔振系统情况下,单排桩对低速荷载引起振动的隔振效果比高速移动荷载效果好。同时,较高速时的最佳桩长比低速时要短。 相似文献
8.
9.
A single pile embedded in a layered poroelastic half‐space subjected to a harmonic lateral load is investigated in this study. Based on Biot's theory, the frequency domain fundamental solution for a horizontal circular patch load applied in the layered poroelastic half‐space is derived via the transmission and reflection matrices method. Utilizing Muki and Sternberg's method, the second kind of Fredholm integral equation describing the dynamic interaction between the layered half‐space and the pile subjected to a top harmonic lateral load is constructed. The proposed methodology is validated by comparing results of this paper with some existing results. Numerical results show that for a two‐layered half‐space, the thickness of the upper softer layer has pronounced influences on the dynamic response of the pile and the half‐space. For a three‐layered half‐space, the presence of a softer middle layer in the layered half‐space will enhance the compliance for the pile significantly, while a stiffer middle layer will diminish the dynamic compliance of the pile considerably. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
10.
The closed-form analytic expressions for the displacement and stresses at any point of an elastic layer lying over a base
due to a very long vertical strike-slip dislocation are obtained. The interface between the layer and the base is assumed
to be either ‘smooth-rigid’ or ‘rough-rigid’ or ‘welded’. The variations of displacement and stresses with the horizontal
distance from the fault for different types of coupling of the layer with the base have been studied. It is found that the
displacement for ‘welded interface’ lies between the displacements due to ‘smooth rigid’ and ‘rough-rigid’ interfaces for
different positions of the observer and different values of the ratio of rigidities of the layer and half-space. 相似文献
11.
Beach erosion has advanced in many countries of the world, especially in Japan, because of a decrease in sediment sources from rivers and a lack of longshore sediment transport from the adjacent coasts due to coastal structures. The former cause concerns the reduction of river deltas due to a decrease in sediment input from the river. Two timescales important in beach erosion, a longer timescale which concerns a change in the location of the river mouth, and a shorter one which is due to a decrease in longshore sediment transport, are discussed in the formation and reduction of the delta of the Kurobe River. Based on these timescales, beach erosion control is considered. 相似文献
12.
In intra-plate regions with low-seismic activity, seismic cycles last between 103 and 105 years and, consequently, quiescent faults may be capable of producing catastrophic earthquakes. Paleoseismic studies, which
are necessary to define capable faults in these regions and to establish their seismic parameters, are scarce and not always
possible. In order to overcome the scarcity of paleoseismic data, this paper proposes an approach to evaluate the capability
and seismic parameters of faults. This approach takes into account instrumental, historical, paleoseismological and geological
data. Assuming that in a given structural region with definite climatic and geological characteristics similar geomorphic
features reflect a similar structural-seismic evolution, the capability of faults is established by comparing the fault related
geomorphic features of the few proven seismogenic faults with those of the rest of the faults. The seismic parameters were
estimated using some mathematical relationships from geological and geomorphological data, where the slip rate of the faults
was determined from geological and geomorphological criteria. The case of eastern Iberia is presented to illustrate this approach.
This area is characterized by low seismicity, few historical destructive earthquakes, and only one fault with good paleoseismological
data. Of the 249 potential faults (longer than 10 km and adequately oriented with respect to the current stress field), 23
were regarded as capable faults. Some of these were located in seismic quiescent areas, and their main seismic parameters
were estimated. 相似文献