scholarly journals The complexity of 3D stress-state changes during compressional tectonic inversion at the onset of orogeny

2012 ◽  
Vol 367 (1) ◽  
pp. 51-69 ◽  
Author(s):  
Koen Van Noten ◽  
Hervé Van Baelen ◽  
Manuel Sintubin
Keyword(s):  
Stress State ◽  
Tectonic Inversion ◽  
State Changes ◽  
3D Stress State

scholarly journals Time influence of tunnel support on the factor of safety

2020 ◽  
Vol 157 ◽  
pp. 06002
Author(s):  
Ivana Nedevska ◽  
Zlatko Zafirovski ◽  
Slobodan Ognjenovic ◽  
Ivona Nedevska ◽  
Vasko Gacevski
Keyword(s):  
Rock Mass ◽  
Stress State ◽  
Factor Of Safety ◽  
Tunnel Excavation ◽  
Tunnel Support ◽  
Plastic Deformations ◽  
Primary Stress ◽  
Reaction Curve ◽  
State Changes ◽  
The Moment

Before taking any measures to build a tunnel, the rock (soil) is in a primary stress state, which means that the stress state is a function of the thickness of the overburden. At the moment when the measures necessary to excavate a tunnel are taken, the rock state changes from primary to secondary, leading to stress concentration, especially in the tunnel abutments. If the rock is capable of accepting these stresses, a state of equilibrium is reached after certain deformations. Plastic deformations can occur if the stresses are larger than the strength of the rock mass. To avoid excessive deformations or collapse of the rock and the tunnel excavation, it is necessary to place a support. The achieved factor of safety is a function of both the support type and the time when the support is installed. This paper shall present a numerical example of different pressures considered in order to obtain the rock’s reaction curve.

One-Way Cyclic Behavior of Saturated Clay in 3D Stress State

2019 ◽  
Vol 145 (10) ◽  
pp. 04019077 ◽  
Author(s):  
Chuan Gu ◽  
Yongzheng Wang ◽  
YuJun Cui ◽  
Yuanqiang Cai ◽  
Jun Wang
Keyword(s):  
Stress State ◽  
Cyclic Behavior ◽  
Saturated Clay ◽  
3D Stress State

scholarly journals Stress state of metal dome meridional ribs at different stages of overhang erection process

2020 ◽  
Vol 16 (2) ◽  
pp. 111-121
Author(s):  
Evgeny V. Lebed ◽  
Vladimir P. Vershinin
Keyword(s):  
Mathematical Model ◽  
Stress State ◽  
Structural Reliability ◽  
Dead Weight ◽  
Bottom Up ◽  
Steel Strength ◽  
State Changes ◽  
The Relationship ◽  
Skeleton Stress

Research aim. The aim of the present research was an analysis of a metal ribbed ring-shaped dome metallic ribs stress state at different stages of a skeleton overhang erection process. The considered dome is hemispherical and is assembled bottom-up of individual elements. Due to a varying slope of meridional ribs elements at different relative elevations their stress state changes during mounting. The effect of the overhang erection process onto the stress state of the metal dome meridional ribs has been investigated. The relationship between the stress state of a meridional rib and mounting of each next dome skeleton tier has been established. Methods. A mathematical model of the metal ribbed ring-shaped dome assembled of steel H-shaped elements with rigid connections has been developed. Several extra models corresponding to different skeleton erection stages have been also generated to determine stresses in the meridional ribs at these stages. Response of each dome mathematical model under dead-weight load has been simulated. The obtained values of stresses in the meridional ribs within different models have been compared with corresponding design stresses values. Results. The dependence of the metal dome meridional rib stress state onto the stages of overhang erection process has been plotted. A degree of utilization of ribs steel strength at different erection stages has been represented by diagrams. An estimation of the dome skeleton stress state during overhang erection has been given. Imminence of assembly stresses during overhang erection and their influence onto dome structural reliability has been pointed out.

Finite Element Method in the Research on the Application of Contact Deformation

2012 ◽  
Vol 182-183 ◽  
pp. 1585-1589 ◽  
Author(s):  
Jia Jia Su ◽  
Jing Hu Chen
Keyword(s):  
Finite Element Method ◽  
Plastic Deformation ◽  
Finite Element ◽  
Stress State ◽  
Friction Coefficient ◽  
Contact Deformation ◽  
Matrix Surface ◽  
The Matrix ◽  
State Changes ◽  
Element Method

Wear is the matrix surface and plastic deformation as the basic factors of the phenomenon, this paper analyzed with abaqus finite element method friction deformation which stress. The results show that the stress state changes drastically with different friction coefficient and the distribution of plastic deformation regions also changes. The regions seriously damaged by friction lead to fatigue via plastic deformation, which is the main reason for material friction and then dislocation friction occurs.

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