Horizontal surface deformation due to dike emplacement in an elastic-gravitational layer overlying a viscoelastic-gravitational half-space

1995 ◽  
Vol 100 (B4) ◽  
pp. 6329-6338 ◽  
Author(s):  
M. A. Hofton ◽  
J. B. Rundle ◽  
G. R. Foulger
Keyword(s):  
Half Space ◽  
Surface Deformation ◽  
Horizontal Surface

A Three-Dimensional Model of Line-Contact Elastohydrodynamic Lubrication for Heterogeneous Materials with Inclusions

2016 ◽  
Vol 08 (02) ◽  
pp. 1650014 ◽  
Author(s):  
Kun Zhou ◽  
Qingbing Dong
Keyword(s):  
Film Thickness ◽  
Half Space ◽  
Surface Deformation ◽  
Three Dimensional ◽  
Elastohydrodynamic Lubrication ◽  
Lubricant Film ◽  
Line Contact ◽  
Lubricant Film Thickness ◽  
Equivalent Inclusion Method ◽  
Surface Contact

This paper develops a three-dimensional (3D) model for a heterogeneous half-space with inclusions distributed periodically beneath its surface subject to elastohydrodynamic lubrication (EHL) line-contact applied by a cylindrical loading body. The model takes into account the interactions between the loading body, the fluid lubricant and the heterogeneous half-space. In the absence of subsurface inclusions, the surface contact pressure distribution, the half-space surface deformation and the lubricant film thickness profile are obtained through solving a unified Reynolds equation system. The inclusions are homogenized according to Eshelby’s equivalent inclusion method (EIM) with unknown eigenstrains to be determined. The disturbed half-space surface deformations induced by the subsurface inclusions or eigenstrains are iteratively introduced into the lubricant film thickness until the surface deformation finally converges. Both time-independent smooth surface contact and time-dependent rough surface contact are considered for the lubricated contact problem.

Poroelasticity: Efficient modeling of strongly coupled, slow deformation processes in a multilayered half‐space

Geophysics ◽  
2003 ◽  
Vol 68 (2) ◽  
pp. 705-717 ◽  
Author(s):  
Rongjiang Wang ◽  
Hans‐Joachim Kümpel
Keyword(s):  
Half Space ◽  
Numerical Scheme ◽  
Surface Deformation ◽  
Fluid Pressure ◽  
Mirror Image ◽  
Excess Pore Pressure ◽  
Near Surface ◽  
Strongly Coupled ◽  
Image Technique ◽  
Subsurface Reservoir

We present a fast, powerful numerical scheme to compute poroelastic solutions for excess pore pressure and displacements in a multilayered half‐space. The solutions are based on the mirror‐image technique and use an extension of Haskell's propagator method. They can be applied to assess in‐situ formation parameters from the surface deformation field when fluids are injected into or extracted from a subsurface reservoir, or they can be used to simulate changes in pore‐fluid pressure resulting from matrix displacements induced by an earthquake. The performance of the numerical scheme is tested through comparison with observations of the surface deformation as recorded by tiltmeters in the vicinity of an iteratively pumped well. Modeling of near‐surface tilt data around a productive well is useful in constraining hydraulic diffusivity in the layered subsurface.

scholarly journals Research on Surface Subsidence of Long-Span Underground Tunnel

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Jun Yan ◽  
Xueying Liu ◽  
Xiaoyu Bai ◽  
Mingyi Zhang ◽  
Yujin Jiao ◽  
...  
Keyword(s):  
Surface Deformation ◽  
Vertical Surface ◽  
Surface Settlement ◽  
Horizontal Surface ◽  
Urban Rail Transit ◽  
Ground Subsidence ◽  
Underground Excavation ◽  
Management Level ◽  
Long Span ◽  
Geological Conditions

In the process of urban rail transit construction, underground excavation method is often used in subway station construction. Based on a large number of measured data of Qingdao Metro Line 3, this paper analyzes and studies the ground subsidence law of long-span shallow buried excavation station. The research results show that vertical surface settlement will be caused by the excavation of both sides of the guide hole, but the settlement is relatively small, basically within −10 mm. Large surface settlement will occur during the middle or middle guide hole excavation, with a large settlement up to −30 mm. Through data fitting, it is found that the regression analysis using cubic polynomial of one degree can get better fitting effect. The horizontal surface variation rules of underground excavation stations are affected by the tunnel depth, geological conditions, management level of monitoring units, monitoring layout and monitoring accuracy, and so on. The differences in horizontal surface deformation and settlement between stations are large. Wannianquan Road Station basically conforms to the deformation law of ground settlement trough in Peck, and Junfeng Road Station directly above belongs to the whole subsidence type. This study has accumulated a large number of surface settlement monitoring data, which can provide a certain reference for the subsequent design of similar lines.

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