Simulation Analysis of the Long-Term Stability for Frozen Soil Roadbed

The global warming will lead to rising temperature in Tibetan plateau which will cause some trouble to the long-term stability of frozen soil roadbed. Of course, the temperature is the most important to stability analysis and study of frozen soil roadbed. In this paper, taking the frozen soil roadbed in Tibetan plateau as an example, the numerical simulation model is established. Firstly, the characteristics of temperature fields of frozen soil roadbed in the future 50 years are analyzed, and then the vertical and horizontal displacements without load and under dynamic load are analyzed.

Download Full-text

Numerical Simulation Analysis on Stability of Coal Pillar of Empty Mine Goaf in North of Shanxi Province

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.470.205 ◽

2013 ◽

Vol 470 ◽

pp. 205-210

Author(s):

Hao Tang ◽

Zi Guang He ◽

Hai Bo Lian

Keyword(s):

Numerical Simulation ◽

Simulation Analysis ◽

Coal Pillar ◽

Shanxi Province ◽

Analysis Model ◽

Term Stability ◽

Long Term Stability ◽

The Law ◽

The Stability

The analysis model of coal pillar of a empty mine goaf in north of Shanxi province was constructed and the process of coal pillar from formation to weathering was simulated through the application of software of FLAC3D in this article. The stressstrain and the law of plasticity transformation of coal pillar from formation to weathering were analyzed and the long-term stability of coal pillar was forecasted. The result showed that the stability of coal pillar was bad for excessive excavated and weathering and the coal pillar will be broken easier for pressure and shear.

Download Full-text

Design and Verification of a Sensing Device for Deformation Measurement of High Temperature Pipes

Journal of Pressure Vessel Technology ◽

10.1115/1.4003461 ◽

2011 ◽

Vol 133 (4) ◽

Cited By ~ 6

Author(s):

J. H. Jia ◽

X. Y. Hu ◽

Z. L. An ◽

F. Z. Xuan ◽

S. T. Tu

Keyword(s):

Numerical Simulation ◽

High Temperature ◽

Power Plants ◽

Design Procedure ◽

Term Stability ◽

Long Term Stability ◽

Pipe Model ◽

Working Principle ◽

Excellent Stability

In this paper, a sensing device specifically for measuring deformations of high temperature pipes is designed, and its applicability is verified both experimentally and theoretically. First, the design procedure and the working principle of the sensing device are described in detail. Then, experiments are carried out to prove the accuracy and the long-term stability of the sensing device. To verify the accuracy of the device, numerical simulation of the deformation of a pipe model is carried out using finite element method. Results from the experimental measurements are in good agreement with results from the numerical simulation. The long-term stability of the device is validated by monitoring the deformation. Conclusions are drawn that the designed sensing device has high accuracy and excellent stability and can be used for measuring deformations of high temperature pipes in power plants.

Download Full-text