Long-tern field test and numerical simulation of foamed polyurethane insulation on concrete dam in severely cold region

2019 ◽  
Vol 212 ◽  
pp. 618-634 ◽  
Author(s):  
Bo Chen ◽  
Mingming He ◽  
Zishen Huang ◽  
Zhongru Wu
Keyword(s):  
Numerical Simulation ◽  
Field Test ◽  
Cold Region ◽  
Concrete Dam

Field test and numerical simulation of the section mill in U-shaped wells of coalbed methane

2020 ◽  
Vol 84 ◽  
pp. 103681
Author(s):  
Jiaqi Che ◽  
Hanxiang Wang ◽  
Yanwen Zhang ◽  
Yuting Wang ◽  
Yanxin Liu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Field Test ◽  
Coalbed Methane ◽  
Section Mill

scholarly journals Study on reasonable grouting parameters based on UDEC numerical simulation

2019 ◽  
Vol 118 ◽  
pp. 02013
Author(s):  
Fengfeng Yang ◽  
Liping Bai ◽  
Ruiqing Su ◽  
Jufeng Zhang ◽  
Tai Xu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Field Test ◽  
Surrounding Rock ◽  
Frequent Occurrence ◽  
Roof Collapse ◽  
Grouting Reinforcement ◽  
Rock Roadway

In view of the frequent occurrence of roof collapse and chipping accidents in the broken surrounding rock roadway in the goaf, grouting reinforcement is applied to the surrounding rock of the ro ent ratio. The field test proves that the selected grouting parameters are reasonable and achieve the purpose of controlling the deformation of the surrounding rock of the roadway.

Renovation of existing steel railway bridges: Field test and numerical simulation

2017 ◽  
Vol 21 (6) ◽  
pp. 809-823 ◽  
Author(s):  
Weiwei Lin ◽  
Nozomu Taniguchi ◽  
Teruhiko Yoda ◽  
Masanori Hansaka ◽  
Shinya Satake ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Field Test ◽  
Railway Bridges

The Application of Particle Motion Equation in Coal Handling System of Dissipation Dust Law

2013 ◽  
Vol 313-314 ◽  
pp. 702-705
Author(s):  
Shao Cheng Ge ◽  
Yao Xuan Feng ◽  
De Ji Jing
Keyword(s):  
Numerical Simulation ◽  
Field Test ◽  
Particle Motion ◽  
Theoretical Basis ◽  
Coal Dust ◽  
Motion Equation ◽  
Dust Concentration ◽  
Dust Particles ◽  
Space Application ◽  
Handling System

For getting the effectiveof application in dissipation dust law with particle motion equation atcoal handling system of belt machine tail, must be to proceed related numerical simulation in the way of dust particles motion incoal handling system of belt machine tail and dust concentration of diffusion inoperation space. Application particlemotion equation theory for numerical simulation to coal dustparticles, obtained dust coal dissipation law in coal handling system, at thesame time combine with the data of the field test of dust concentration andfallout dispersion for analyzing and comparing. The results of comparison showthat: the data of numerical simulation with particle motion equationin coal dust dissipation law is coincide with reality dissipation law. Accordingto the conclusion of this research, it is provides theoretical basis forprevention and treatment in coal mine of coal handling system of dustdissipation.

Acoustic Emission (AE) Propagation Attenuation Theory and Rule in Non-Perfect Elastic Coal and Rock

2013 ◽  
Vol 477-478 ◽  
pp. 620-623
Author(s):  
Guo Wei Dong
Keyword(s):  
Numerical Simulation ◽  
Acoustic Emission ◽  
Quality Factor ◽  
Field Test ◽  
Propagation Distance ◽  
Signal Propagation ◽  
Emission Signal ◽  
Ae Signal ◽  
Propagation Rule ◽  
Quality Factor Q

Propagation rule of acoustic emission (AE) signal in coal and rock is an important basis when AE technique forecasts coal and rock dynamical disasters. Based on correlative theory of quality factor Q, Acoustic emission signal propagation attenuation formula in non-perfect elastic coal and rock are analyzed, Based on the theoretic formula, Effects of different quality factor and propagation distance on AE propagation attenuation are theoretically analyzed ;Based on theoretic analysis results, AE signal propagation numerical simulation and field test programs are designed, AE signal propagation rules in elastoplastic coal and rock are obtained. Field test and numerical simulation experimentation results validate rationality of theoretic forumla. Study production can guide AE technique that forecasts mine and rock dynamical disasters.

Numerical simulation for the coupled problem of temperature and seepage fields in cold region dams

2002 ◽  
Vol 40 (5) ◽  
pp. 631-635 ◽  
Author(s):  
Lai Yuanming ◽  
Liu Songyu ◽  
Wu. Ziwang ◽  
Wu Yaping ◽  
J.M. Konrad
Keyword(s):  
Numerical Simulation ◽  
Cold Region ◽  
Coupled Problem

Study on the Wind-Sand Flow Movement Characteristics and the Shielding Effect of the Wind-Break Wall along the Railway in Gobi Area

2012 ◽  
Vol 178-181 ◽  
pp. 1653-1657 ◽  
Author(s):  
Jian Jun Cheng
Keyword(s):  
Numerical Simulation ◽  
Field Test ◽  
Shielding Effect ◽  
Leeward Side ◽  
Field Surveys ◽  
Movement Characteristics ◽  
Large Vortex ◽  
Sand Flow ◽  
Term Monitoring

Based on the large number of field surveys and long-term monitoring data of Hongceng, Hongliu and MengliuDong monitoring points, the wind-sand flow movement characteristics along the railway in Gobi area was analyzed. The shielding effect of the wind-break wall was evaluated by the methods of numerical simulation and field test. Conclusions drawn as followings: the wind-sand flow movement in Gobi area is characterized by stable of direction, seasonal, high-velocity,long-term,and shorting of starting-up time and moresand content. Numerical simulation shows that the wind flow form a large vortex region on the leeward side of wall, the flow field elements occurs significant changes. Both field test data and numerical simulations indicated that 3.0m height of wind-break wall meet the requirement of shielding wind-sand flow.

Numerical Simulation of Fracture Process of Concrete Dam due to Freezing and Thawing with Finite Element Method

2007 ◽  
Vol 348-349 ◽  
pp. 941-944
Author(s):  
Li Juan Cao ◽  
Shou Ju Li ◽  
Zi Chang Shangguan
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Thermal Stress ◽  
Cold Climate ◽  
Temperature Fields ◽  
Stress Fields ◽  
Freezing And Thawing ◽  
Concrete Dam ◽  
Element Method

Freezing and thawing damage is one of the major problems of concrete dams in cold climate. Cracking and splitting are the most common results of freezing and thawing deterioration in concrete dam. The cracking problem owing to freezing and thawing was investigated by making sue of finite element methods. The interpretation of the mechanism of failure was also given. In order to compute the thermal stress fields of concrete dam caused by freezing and thawing, the temperature changes versus seasons is determined according to measured data. The temperature fields of concrete dam versus seasons are simulated by using finite element method. Basing on the computational results of the temperature fields of concrete dam, the thermal stress fields are calculated numerically. The researches show that the first principal stress of concrete dam at downstream surface can exceed the tensile strength of concrete material. The numerical simulation results of fractured regions of concrete dam agreed with practical observed data.

Numerical Study on Effect of Covered Water in Thawing Frozen Soil by Explosive Load

2013 ◽  
Vol 767 ◽  
pp. 211-216
Author(s):  
Hideki Hamashima ◽  
Toshiaki Watanabe ◽  
Hironori Maehara ◽  
Kazuyuki Hokamoto ◽  
Shigeru Itoh
Keyword(s):  
Numerical Simulation ◽  
Numerical Study ◽  
Frozen Soil ◽  
Experimental Result ◽  
Cold Region ◽  
Explosive Load ◽  
Simple Experiment

It is known to be able to expect the improvement of the harvest if the cropping time can be made early in a cold region such as Russia, Norway, Sweden and Hokkaido in Japan. Therefore, for the purpose of making cropping time early as much as possible, we researched the destruction of the frozen soil by the explosive. In the simple experiment, as compared with the experiment which placed the explosive directly on top of the frozen soil, it broke greatly in the experiment which poured out water 20 mm in height after placing an explosive directly on top of the frozen soil. Furthermore, it was found that the thawing time of residual frozen soil in the experiment using water is shorter than without water. In this research, in order to investigate the effect of the covered water in thawing frozen soil by explosive load, the numerical simulation was performed. The result of the numerical simulation was well in agreement with the experimental result, and it was clarified that destruction effect is increased by covering with water.

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