Determination of Deformation Characteristics of Permafrost from Impression of a Spherical Plate

2004 ◽  
Vol 41 (2) ◽  
pp. 60-64 ◽  
Author(s):  
L. T. Roman ◽  
É. G. Veretekhina
Keyword(s):  
Deformation Characteristics ◽  
Spherical Plate

scholarly journals Research on the Deformation Characteristics and Support Technology of a Bottom Gas Extraction Roadway under Repeated Interference

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Rongkun Pan ◽  
Zhihui Ma ◽  
Minggao Yu ◽  
Shuaidong Wu
Keyword(s):  
Coal Mine ◽  
Maximum Shear Stress ◽  
Mechanical Analysis ◽  
Gas Extraction ◽  
Deformation Characteristics ◽  
Maximum Displacement ◽  
Multiple Disturbances ◽  
Mining Disturbance ◽  
Mining Face

Taking Pingbao Coal Mine as the engineering background, the stress distribution, surrounding rock displacement, and plastic zone distribution characteristics of a bottom gas extraction roadway are simulated by FLAC3D under multiple disturbances. The mining disturbance due to the overlying coal seam is obtained: the deformation of the roof subsidence and lower rib closure of the bottom gas extraction roadway are larger than the floor heave and upper rib closure, respectively. According to the mechanical analysis of the bottom gas extraction roadway, the equations for calculating the displacement at each point on the surface of the bottom gas extraction roadway and the methods for calculating the maximum displacement, the maximum normal stress, and the maximum shear stress are obtained to reasonably explain the deformation of the bottom gas extraction roadway under multiple disturbances. Then, the bolt-mesh-anchor and ladder beam support mode are designed. After onsite observation of the bottom gas extraction roadway of the 12030 coal mining face of the Pingbao Coal Mine, it is concluded that the deformation characteristics of the bottom gas extraction roadway basically conform to the abovementioned equations and that the support is effective. This paper can provide a reference for the optimization of bottom gas extraction roadway positioning, the determination of support parameters, and the deformation prediction around a bottom gas extraction roadway under similar conditions.

Determination of the deformation characteristics of permafrost by the method of probe thawing

1986 ◽  
Vol 23 (6) ◽  
pp. 248-251
Author(s):  
E. S. Maksimenko ◽  
V. D. Ponomarev ◽  
V. A. Sorokin ◽  
Yu. G. Fedoseev
Keyword(s):  
Deformation Characteristics

Model of the Deformation Process under Thermo-Mechanical Fatigue Conditions

2012 ◽  
Vol 726 ◽  
pp. 143-149
Author(s):  
Jerzy Okrajni ◽  
Grzegorz Junak
Keyword(s):  
Deformation Process ◽  
Low Cycle Fatigue ◽  
Hysteresis Loops ◽  
Fatigue Tests ◽  
Mathematical Representation ◽  
Deformation Characteristics ◽  
Cycle Fatigue ◽  
Calculation Algorithm ◽  
Mechanical Fatigue

The paper focuses on the development of a mathematical representation of deformation characteristics under the conditions of an elevated changeable temperature and mechanical loads. The method proposed in the paper is based on the use of characteristics determined in low-cycle fatigue tests at constant temperatures. Hysteresis loops reflecting the behaviour of a material under the conditions of low-cycle loads at an elevated temperature were primarily used. The effect of relaxation on the course of the hysteresis loop was taken into account. The steady state of the material is referred to in the proposed representation. A calculation algorithm was developed to enable the determination of the stress value for subsequent increases of strain over time. The results obtained were compared with experimentally determined characteristics.

scholarly journals I mpact of compaction and thaw conditionson deformation characteristics of thawing soils

2017 ◽  
pp. 58-63
Author(s):  
P. I. Kotov ◽  
L. T. Roman ◽  
M. N. Tsarapov
Keyword(s):  
Physical Properties ◽  
Experimental Determination ◽  
Sandy Loam ◽  
Three Dimensional ◽  
Deformation Characteristics ◽  
Clay Loam ◽  
Laboratory Studies ◽  
Compression Coefficient ◽  
Plane Parallel

The results of laboratory studies of the effect of thawing conditions (plane-parallel or three dimensional) on the deformation characteristics (thawing and compression coefficients) thaw- ing soils (sand, sandy loam, clay loam) with desired physical properties of massive and layered cryogenic textures presented in the article. It was found that the values of the thawing coefficient bigger after three dimensional thawing, and compression coefficient after plane- parallel thaw- ing. The obtained data allowed to establish the applicability of the experimental determination of thawing soils deformation characteristics regardless of thawing conditions.

Determination of the deformation characteristics of polycaproamide fabrics

1998 ◽  
Vol 30 (1) ◽  
pp. 42-47
Author(s):  
A. M. Stalevich ◽  
Z. I. Vakhitova
Keyword(s):  
Deformation Characteristics

scholarly journals Experimental Testing of Masonry Subjected to Concentrated Load in Direction of Bed Joints

2020 ◽  
Vol 12 (22) ◽  
pp. 9474
Author(s):  
Marie Kozielova ◽  
Lucie Mynarzova ◽  
Petr Mynarcik
Keyword(s):  
Modulus Of Elasticity ◽  
Experimental Testing ◽  
Experimental Tests ◽  
Deformation Characteristics ◽  
Concentrated Load ◽  
Direction Parallel ◽  
Laboratory Facilities ◽  
Deformation Properties ◽  
Masonry Units

One of the options for rehabilitating existing masonry buildings is a post-tensioning of masonry. The deformation properties of the masonry in the direction parallel to bed joints are essential for the design of a suitable value of the applied force. However, these values are usually not available or are defined only roughly. The aim of this study was to determine, as accurately as possible, the deformation characteristics of the masonry in the direction parallel to the bed joints. Experimental measuring of masonry samples was carried out in laboratory facilities designed specifically for testing the triaxial state of stress of the masonry. The obtained deformations were used to determine the modulus of elasticity of the masonry in the direction of bed joints. Within these experimental tests, laboratory measuring of mechanical masonry properties was carried out, and deformation characteristics were defined on the basis of calculations. The strengths of masonry units and mortar were tested in the laboratory and, according to the tests results, the modulus of elasticity in the direction perpendicular to bed joints was determined. The modulus of elasticity in the direction parallel to bed joints was verified through a simple numerical model. The calculated deformations were compared with the measured values. On the basis of the determination of the deformation characteristics of masonry in the direction of bed joints, the ratios of the modulus of elasticity in the direction perpendicular and parallel to bed joints were concluded.

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