Large-scale deformation associated with ridge subduction   总被引：1，自引：0，他引：1  

Eric L. Geist  Michael A. Fisher  David W. Scholl 《Geophysical Journal International》1993,115(2):344-366

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Time-dependent thermal state of the lithosphere in the foreland of the Eastern Carpathians bend. Insights from new geothermal measurements and modelling results     

C. Demetrescu  H. Wilhelm  M. Tumanian  S.B. Nielsen  A. Damian  V. Dobric&#;  M. Ene 《Geophysical Journal International》2007,170(2):896-912

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Core–mantle boundary deformations and J₂ variations resulting from the 2004 Sumatra earthquake     

V. Cannelli  D. Melini  P. De Michelis  A. Piersanti  F. Florindo 《Geophysical Journal International》2007,170(2):718-724

The deformation at the core–mantle boundary produced by the 2004 Sumatra earthquake is investigated by means of a semi-analytic theoretical model of global coseismic and postseismic deformation, predicting a millimetric coseismic perturbation over a large portion of the core–mantle boundary. Spectral features of such deformations are analysed and discussed. The time-dependent postseismic evolution of the elliptical part of the gravity field ( J ₂) is also computed for different asthenosphere viscosity models. Our results show that, for asthenospheric viscosities smaller than 10¹⁸ Pa s, the postseismic J ₂ variation in the next years is expected to leave a detectable signal in geodetic observations.  相似文献   

Modelling of mantle postglacial relaxation in axisymmetric geometry with a composite rheology and a glacial load interpolated by adjusted spherical harmonics analysis     

G. Dal Forno  P. Gasperini 《Geophysical Journal International》2007,169(3):1301-1314

Although studies on glacial isostatic adjustment usually assume a purely linear rheology, we have previously shown that mantle relaxation after the melting of Laurentide ice sheet is better described by a composite rheology including a non-linear term. This modelling is, however, based on axially symmetric geometry and glacial forcing derived from ICE-3G and suffers from a certain amount of arbitrariness in the definition of the ice load. In this work we apply adjusted spherical harmonics analysis to interpolate the ice thicknesses of ICE-3G and ICE-1 glaciological models. This filters out the non-axisymmetric components of the ice load by considering only the zonal terms in the spherical harmonics expansion. The resulting load function is used in finite-element simulation of postglacial rebound to compare composite versus purely linear rheology. Our results confirm that composite rheology can explain relative sea level (RSL) data in North America significantly better than a purely linear rheology. The performance of composite rheology suggests that in future investigations, it may be better to use this more physically realistic creep law for modelling mantle deformation induced by glacial forcing.  相似文献   

Scaling of fracture length and distributed damage     

Vladimir Lyakhovsky 《Geophysical Journal International》2001,144(1):114-122

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土工格栅加筋碎石土大型三轴试验研究   总被引：27，自引：6，他引：27  

赵川  周亦唐 《岩土力学》2001,22(4):419-422

在大型三轴仪上进行了素碎石土和加筋碎石土的三轴排水剪切试验，探讨了加筋碎石土的强度及变形特性；分析了塑料土工格栅的加筋机理，为加筋碎石土的理论计算提供了依据。  相似文献   

正常固结饱和粘性土的不排水强度     

侯龙清  黄松华  罗嗣海 《上海国土资源》2001,(Z1):59-61

本文以有效应力强度理论和Henkel孔隙水压力公式为基础,建立了各种类三轴与平面应变试验条件下正常固结饱和粘土的不排水强度公式及相互关系;初步估计了粘土强度随固结增长的计算公式.  相似文献   

含粘粒砂土抗液化性能的试验研究   总被引：20，自引：1，他引：20  

衡朝阳  何满潮  裘以惠 《工程地质学报》2001,9(4):339-344

通过对含粘粒砂土所作的试验研究, 包括: 粘粒矿物成分不同、粘粒含量不同的重塑土样所作的室内动三轴试验; X光衍射试验, 试验结果对比分析后, 得出了含粘粒砂土抗液化性能的特性。并得出以下结论: (1)粘粒矿物成分不同, 也引起砂土动力稳定性的变化; (2 )动剪应力强度与粘粒含量并非呈单调增加关系, 而呈抛物线型, 并给出回归方程; (3)含粘粒的砂土, 其抗液化能力最低点总是在粘粒含量 8.5～ 9.5 %之间。  相似文献   

Cyclic strength and deformation of crushable carbonate sand     

Masayuki Hyodo  Noritaka Aramaki  Masayuki Itoh  Adrian F.L. Hyde 《Soil Dynamics and Earthquake Engineering》1996,15(5):331-336

Cyclic triaxial tests have been carried out on a skeletal carbonate sand from the west coast of Eire. Results are presented for undrained cyclic shear tests on samples with 80% of relative density consolidated under both isotropic and anisotropic conditions. Failure was defined as a 5% double amplitude cyclic strain and a 5% peak axial strain for stress-reversal and non-reversal stress conditions, respectively. Using this definition the cyclic strength for isotropically consolidated samples was affected by the confining pressure although the angular platey nature of the sand resulted in higher cyclic strengths than for a comparable silica sand. For anisotropically consolidated samples the cyclic strength increased with increasing initial static shear stress while on the other hand the cyclic strength normalised in the usual way with respect to the initial confining pressure decreased as this pressure increased.  相似文献   

大陆岩石圈流变学研究   总被引：2，自引：1，他引：2  

索书田 《地质科技情报》1992,11(2):6-10

简单介绍了流变学的概念和两种基本研究方法,基于大陆岩石圈较大洋岩石圈有更为复杂的流变特征客观事实,指出研究大陆岩石圈流变学的重要性,并提出几个主要的研究方向和领域。  相似文献