Influential factors of inclined fracture induction logging based on numerical simulation and physical experiment

2021 ◽  
pp. 1-12
Author(s):  
Z. Y. Nan ◽  
J. Li ◽  
M. J. Tan
Keyword(s):  
Numerical Simulation ◽  
Physical Experiment ◽  
Influential Factors ◽  
Induction Logging

Study on a straightening process by reciprocating bending for metal profiles

2021 ◽  
Vol 118 (6) ◽  
pp. 605
Author(s):  
Qingdang Meng ◽  
Gaocao Yu ◽  
Xueying Huang ◽  
Honglei Sun ◽  
Jun Zhao
Keyword(s):  
Numerical Simulation ◽  
Elastic Deformation ◽  
Quality Parameter ◽  
Area Ratio ◽  
Physical Experiment ◽  
Rectangular Section ◽  
Residual Deflection ◽  
Section Profile ◽  
Different Shapes

The straightness is a critical quality parameter of metal profiles, and straightening is a necessary process in metal profile production. Due to the limitations of the existing straightening methods, the straightening process by reciprocating bending for metal profiles is proposed. The curvature is unified by multiple reciprocating bending, and then the straightening is completed by reverse bending. The process has the advantages of high straightening efficiency, flexibility, and wide straightening range. In order to verify the feasibility of the process, numerical simulation and physical experiment are carried out with the rectangular section profile with “C” shape and “S” shape. The results show the profiles of different shapes are unified into arcs of the same size after multiple reciprocating bending. In addition, the smaller the elastic area ratio (ratio of elastic deformation to overall deformation) is, the better the effect of unification curvature is. The residual deflection is basically the same after straightening, and straightness is within 0.1%.

scholarly journals Analysis of the Compressibility Effect of Overburden in a Deep Shield Tunnel Based on the Effect of the Pressure Arch

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Ping Lei ◽  
Xin Han ◽  
Fei Ye ◽  
Xing Liang ◽  
Biao He ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Soil Mass ◽  
Influential Factors ◽  
Planning System ◽  
Shield Tunnel ◽  
Building Structure ◽  
Concentrated Force ◽  
Compressibility Effect ◽  
Arch Effect ◽  
Translational Displacement

With the continuous improvement of the planning system for urban subway construction, shield tunnels are being more frequently constructed, and thus, the floating problem of shield tunnels in construction has been paid increasingly more attention. In view of this, in this paper, with the combination of numerical simulation and theoretical analysis, the problem of floating segments compressing the overburden in the deep shield tunnel is discussed. The influential factors of the pressure arch effect are analysed using numerical simulation, the compressive displacement of soil in the plastic zone is investigated in a focused manner based on the pressure arch effect, and the problem of floating segments that the Mindlin solution is applied to under the actions of distributed force and concentrated force is solved. The results show the following: (1) the displacement of the segment is composed of the shield tail gap, the compressive displacement of the soil, and the translational displacement of the soil; (2) the intensity of the pressure arch effect is interactively influenced by the thickness-diameter ratio and the soil properties; (3) the compressive displacement of the soil mass accounts for a larger proportion of floating segment-induced displacements; and (4) the perturbation influence calculation formula of the surrounding strata and the building structure is obtained based on the Mindlin solution.

Numerical Simulation of Influence of Mudstone Interlayer on Compressive Strength of Salt Rock

2012 ◽  
Vol 512-515 ◽  
pp. 1953-1956
Author(s):  
Feng Shan Han ◽  
Song Li
Keyword(s):  
Numerical Simulation ◽  
Compressive Strength ◽  
Natural Gas ◽  
Radioactive Waste ◽  
Mechanical Behavior ◽  
Uniaxial Compressive Strength ◽  
Failure Process ◽  
Physical Experiment ◽  
Salt Rock ◽  
Oil And Natural Gas

Salt rock is think of ideal storage location for oil and natural gas and radioactive waste deposited, interlayer has negative effect on stability of cavern of storage for oil and natural gas and radioactive waste deposited in salt rock, It is difficult to make complete specimen layered salt rock with interlayer. In this paper Based on Rock Failure Process Analysis Code RAFP2D, influence of mudstone interlayer on uniaxial compressive strength of salt rock is investigated by numerical simulation. Numerical simulation shown that when mechanical parameters such as elastic modulus poison’s ratio and uniaxial compressive strength for salt rock and pure mudstone interlayer and content of mudstone interlayer in salt rock are known, compressive strength and mechanical behavior for salt rock with mudstone interlayer can be effectively and accurately analyzed using RFAP2D. The results for numerical simulation are agreement with true physical experiment of salt rock with mudstone interlayer. It should be noticed that the true physical experimental uniaxial compressive strength of rock is in range of 30% mean uniaxial compressive strength of rock element in RFPA2D，in this case the results for numerical simulation can reflect phenomenon and behavior for true physical experiment of salt rock with mudstone interlayer. That provides new method and avenue to analyze and investigate mechanical behavior for multilayer rock mass based on RAFP2D

Analysis of the Influential Factors of Waterlogging Caused by a Reservoir Impoundment and Evaluation of the Related Solutions

2013 ◽  
Vol 726-731 ◽  
pp. 3222-3228
Author(s):  
Shuo Zhang ◽  
Gang Chen ◽  
Cheng Hu ◽  
Long Zhang
Keyword(s):  
Numerical Simulation ◽  
Water Table ◽  
Influential Factors ◽  
Simulation Methods ◽  
Capillary Water ◽  
Reservoir Impoundment ◽  
Drainage Channels ◽  
Numerical Simulation Methods

After the impoundment of large reservoirs, the cut-off wall, originally built into the bedrock to cope with the immersion effects, can block the river backwater zone and minimize the risk of the consequential submergence. However, it also hinders the groundwater at the reservoir bank from flowing into the river, resulting in some sort of waterlogging disasters and causing some impact on the crops and buildings alongshore. This paper mainly focuses on the following three factors, i.e. the water table of the backwater zone, the rising height of capillary water and the characteristics of infiltration and evaporation. All of them are the most straightforward factors of the waterlogging of a reservoir. To tackle the issue, the paper has proposed a solution that combines the relief wells and drainage channels on the basis of the numerical simulation methods.

Probing the influential factors of NMR T 1 – T 2 spectra in the characterization of the kerogen by numerical simulation

2015 ◽  
Vol 260 ◽  
pp. 54-66 ◽  
Author(s):  
Xinmin Ge ◽  
Yiren Fan ◽  
Hua Chen ◽  
Shaogui Deng ◽  
Yingchang Cao ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Influential Factors

Calibration response simulation of a triaxial induction tool with a metal mandrel

Geophysics ◽  
2016 ◽  
Vol 81 (4) ◽  
pp. D419-D425 ◽  
Author(s):  
Wei Xu ◽  
Shizhen Ke ◽  
Chengfang Yin ◽  
Ming Jiang ◽  
Liangang Ma ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Azimuthal Angle ◽  
Simulation Method ◽  
Quantitative Agreement ◽  
3D Finite Element ◽  
Induction Logging ◽  
Simulation Results ◽  
Large Water ◽  
3D Finite Element Method ◽  
Water Tanks

The calibration of triaxial induction logging tools is commonly performed in large water tanks, which are costly and complicated to use. In contrast, calibration with a metal loop is relatively economical and convenient. A tilted metal loop is introduced to calibrate all the components of a triaxial induction tool simultaneously. We have evaluated and optimized parameters such as radius, resistance, azimuthal angle, and position of the calibration loop with the 3D finite-element method. For validation, the accuracy of the simulation method is verified with analytical solutions with consideration of the metal mandrel effect. A quantitative agreement is found between the simulation results and the measurements of a realistic triaxial induction tool with a metal mandrel. Numerical simulation results demonstrate that the presence of the metal mandrel causes the nine components of the tool to change nonlinearly with the formation conductivities in the double logarithmic coordinate. This nonlinear effect can be reduced by eliminating the background signals from the metal mandrel. After the optimization of the parameters of the calibration loop, the responses of the triaxial induction tool can be calibrated accurately.

Study on Deformation Coordination in Upsetting Forging Process of the Crank of Continuous Fiber Crankshaft for Marine

2011 ◽  
Vol 418-420 ◽  
pp. 1324-1329 ◽  
Author(s):  
Bing Wang ◽  
Bao Feng Guo ◽  
Miao Jin ◽  
Wen Cheng Zhao ◽  
Shi Yan Zhao ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Theoretical Basis ◽  
Physical Experiment ◽  
Continuous Fiber ◽  
Marine Engine ◽  
Forging Process ◽  
Good Accordance ◽  
The One

In upsetting forging process of the crank of crankshaft the defects such as lap and caving probably occurs since the bending and upsetting is not in good coordination. In this paper, aiming at 305 crankshaft for marine engine, the coordinative relation between bending and upsetting was thoroughly studied based on 3-step crank upsetting forging approach, i.e. bending-upsetting, upsetting and finish forming. Numerical simulation was carried out to find the reasonable stroke matches of bending and upsetting and physical experiment of using lead sample reduced at the ratio 1:6 in size was conducted to verify the match scheme gained from numerical simulation. The result found from numerical simulation is in good accordance with the one gained through experiment. The work in this paper provides theoretical basis for practice of upsetting forging technique of crank.

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