Deformation mechanisms of sidewall in layered rock strata dipping steeply against the inner space of large underground powerhouse cavern

2022 ◽  
Vol 120 ◽  
pp. 104305
Author(s):  
Ang Li ◽  
Yi Liu ◽  
Feng Dai ◽  
Ke Liu ◽  
Kun Wang
Keyword(s):  
Deformation Mechanisms ◽  
Underground Powerhouse ◽  
Layered Rock ◽  
Rock Strata

Use of an improved ANN model to predict collapse depth of thin and extremely thin layered rock strata during tunnelling

2016 ◽  
Vol 51 ◽  
pp. 372-386 ◽  
Author(s):  
Dong-Fang Chen ◽  
Xia-Ting Feng ◽  
Ding-Ping Xu ◽  
Quan Jiang ◽  
Cheng-Xiang Yang ◽  
...  
Keyword(s):  
Ann Model ◽  
Layered Rock ◽  
Rock Strata

scholarly journals Prediction of the Required Supporting Pressure for a Shallow Tunnel in Layered Rock Strata Based on 2D and 3D Upper Bound Limit Analysis

2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Hong-tao Wang ◽  
Chi Liu ◽  
Ping Liu ◽  
Xin Zhang ◽  
Yong Yang
Keyword(s):  
Upper Bound ◽  
Shallow Tunnel ◽  
Support Design ◽  
Tunnel Support ◽  
Layered Rock ◽  
Supporting Pressure ◽  
Tunnel Design ◽  
2D And 3D ◽  
Support Cost ◽  
Rock Strata

Determination of the required supporting pressure is the premise of tunnel support design. Only when the support design meets the requirements can the tunnel be safe and stable during construction and operation. This paper focuses on a shallow tunnel in layered rock strata and proposes a method for predicting the required supporting pressure. In this method, the 2D and 3D failure mechanisms are constructed, respectively. The analytical solutions of the supporting pressure corresponding to the two cases are derived on the basis of upper bound theorem and Hoek–Brown failure criterion. Then, the proposed method is validated by comparing with the results of existing research studies. Furthermore, a shallow tunnel in two-layer rock strata is chosen to illustrate the difference between the two solutions. The comparison shows that the supporting pressure in the 2D case is greater than that in the 3D case in general and it tends to be conservative for tunnel design. Conversely, the 3D solution may help to reduce the support cost. Furthermore, the change laws of the supporting pressure and failure range corresponding to varying parameters are obtained. These results may practically provide theoretical references for tunnel support design in layered rock strata.

The Effect of Secondary Metalworking Processes on Susceptibility of Aircraft to Catastrophic Failures and Prevention Methods

2013 ◽  
Vol 58 (4) ◽  
pp. 1207-1212
Author(s):  
E.S. Dzidowski
Keyword(s):  
Dynamic Recovery ◽  
Fatigue Cracks ◽  
Shear Bands ◽  
Adiabatic Shear ◽  
Deformation Mechanisms ◽  
Processing Maps ◽  
Adiabatic Shear Bands ◽  
Flow Localization ◽  
Catastrophic Failures ◽  
Prevention Methods

Abstract The causes of plane crashes, stemming from the subcritical growth of fatigue cracks, are examined. It is found that the crashes occurred mainly because of the negligence of the defects arising in the course of secondary metalworking processes. It is shown that it is possible to prevent such damage, i.e. voids, wedge cracks, grain boundary cracks, adiabatic shear bands and flow localization, through the use of processing maps indicating the ranges in which the above defects arise and the ranges in which safe deformation mechanisms, such as deformation in dynamic recrystallization conditions, superplasticity, globularization and dynamic recovery, occur. Thanks to the use of such maps the processes can be optimized by selecting proper deformation rates and forming temperatures.

The effect of seismic deformation mechanisms on fluid migration in accumulation area of gold ore concentrations

2019 ◽  
Vol 484 (1) ◽  
pp. 87-92
Author(s):  
T. M. Zlobina ◽  
V. A. Petrov ◽  
K. Yu. Murashov ◽  
A. A. Kotov
Keyword(s):  
Fluid Flow ◽  
Flow Control ◽  
Deformation Mechanisms ◽  
Fluid Migration ◽  
Fluid Regime ◽  
Gold Ore ◽  
Fluid Flow Control ◽  
Seismic Deformation ◽  
Fluid Inflow ◽  
Main Influence

This study investigates the effect of mechanisms of paleode formations during the period of fluid inflow into the accumulation sphere of gold concentrations. Such mechanisms are believed to correspond to DC- and NDC- type seismic mechanisms, whose main influence on fluid migration lies on the formation of different, relative to fluid regime parameters, structural and hydrodynamic organizations of the ore-forming system, and fluid flow control within the area of the accumulation of ore concentrations.  

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