DEM simulation of two main influence factors on stress release in tunnel excavation in noncohesive granular material

2010 ◽  
pp. 525-530
Author(s):  
Li Zhuang ◽  
Yukio Nakata ◽  
Shunhua Zhou
Keyword(s):  
Granular Material ◽  
Influence Factors ◽  
Stress Release ◽  
Tunnel Excavation ◽  
Dem Simulation ◽  
Main Influence

scholarly journals Evolution of Internal Stress in Heterogeneous Electrode Composite during the Drying Process

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1683
Author(s):  
Zuoquan Zhu ◽  
Yaolong He ◽  
Hongjiu Hu ◽  
Fangzhou Zhang
Keyword(s):  
Internal Stress ◽  
Vinylidene Fluoride ◽  
Influence Factors ◽  
Lithium Ion ◽  
Integrated Analysis ◽  
Drying Time ◽  
Component Distribution ◽  
Poly Vinylidene Fluoride ◽  
Inactive Ingredients ◽  
Main Influence

The mechanical behavior of electrode composite during the drying preparation has played a crucial role in the electrochemical performance of lithium-ion batteries (LIBs). Our work aimed at developing an integrated analysis method to study the component distribution, mechanical properties, and internal stress of composite coating in the process of electrode drying. The main influence factors of drying stress were thoroughly investigated. It was found that this present model could capture not only the heterogeneity effect of inactive ingredients but also the porosity-dependent viscoelasticity of electrode composite. Meanwhile, the calculated effective modulus and stress evolution upon drying time were in acceptable accord with the experimental data. Furthermore, the rapid solidification markedly increased the drying stress in electrodes and significantly impaired the tensile strength of electrode composite due to the highly gradient distributed constituents. However, the stress level at high drying temperature could be significantly reduced by an aqueous sodium alginate binder instead of poly(vinylidene fluoride). The obtained results will be a great help in efficiently manufacturing LIB electrodes with adequate mechanical integrity.

Numerical study on pressure prediction and its main influence factors in pneumatic conveyors

2010 ◽  
Vol 65 (23) ◽  
pp. 6247-6258 ◽  
Author(s):  
A.C. Ma ◽  
K.C. Williams ◽  
J.M. Zhou ◽  
M.G. Jones
Keyword(s):  
Numerical Study ◽  
Influence Factors ◽  
Main Influence

Absolute Measurement of Aspheric Surfaces Using White-Light Interferometry

2007 ◽  
Vol 364-366 ◽  
pp. 80-85
Author(s):  
Su Ping Chang ◽  
Tie Bang Xie ◽  
Xuang Ze Wang ◽  
Jun Guo
Keyword(s):  
High Precision ◽  
White Light ◽  
Spherical Surface ◽  
Three Dimensional ◽  
Influence Factors ◽  
Horizontal Displacement ◽  
Absolute Measurement ◽  
Aspheric Surfaces ◽  
Interferometric Technique ◽  
Main Influence

White-light interferometric technique has been widely applied in the measurement of three-dimensional profiles and roughness with high-precision. Based on the characteristic of interferometric technique, a new method combined with image location and a three-dimensional stage is proposed to achieve the non-contact absolute shape measurement for aspheric and spherical surface in a slarge range. The interference fringes vary with the horizontal displacement of the measured surface, the surface information was obtained by locating the transformation of the maximal intensity in the interferograms. Two main influence factors are discussed; they are performance of the inerferimetric microscope and the stage. Since the performance of the stage directly determines the measurement precision, a three-dimensional displacement stage with a large range and a high precision was developed. Some experiments were carried out to verify the performance of the three-dimensional displacement stage and the validity of the new measurement method with satisfactory results.

Study on Influence Factors of Underground Joint Rock Cavern Displacement

2013 ◽  
Vol 353-356 ◽  
pp. 1515-1518
Author(s):  
Zhen Wang ◽  
Chun Han
Keyword(s):  
Lateral Pressure ◽  
Pressure Coefficient ◽  
Influence Factors ◽  
Two Dimensional ◽  
Tunnel Excavation ◽  
Lateral Pressure Coefficient ◽  
Rock Cavern ◽  
The Many ◽  
Rock Tunnel ◽  
Joint Rock

The safety response of joint rock underground tunnels is one of the many problems that draw the attention of geology specialists and scholars. Adopting two dimensional discrete element method, a numerical model of joint rock underground cavern is established to study its stability. The buried depth and the lateral pressure coefficient are considered respectively. The result shows: when the lateral pressure coefficient is identical, the depth is bigger the displacement is more bigger, and the displacement is strong influenced by the buried depth when the lateral pressure coefficient is big; In the same depth the tunnel is buried, the tunnel rocks displacement is slightly influenced by the lateral pressure coefficient when it is small, but the influence is seriously as the lateral pressure coefficient is big. The simulation in the context can be used to provide guide for joint rock tunnel excavation and supporting.

Analysis of Influence Factors of the Supply Chain Distribution Center Location Based on the ISM Method

2012 ◽  
Vol 220-223 ◽  
pp. 323-326
Author(s):  
Jun Long Zhang ◽  
Xi Fu Wang
Keyword(s):  
Supply Chain ◽  
Quantitative Methods ◽  
Influence Factors ◽  
Distribution Center ◽  
Distribution Centers ◽  
Qualitative And Quantitative Methods ◽  
Logistics Systems ◽  
Center Location ◽  
Main Influence ◽  
Distribution Center Location

Distribution center plays an important role in the whole supply chain, and distribution center location decision is the core content of logistics systems analysis. Based on the analysis of the object of supply chain distribution center location, the main influence factors of the supply chain distribution center location were divided by using the ISM model, and a multi-grade hierarchical structure diagram of distribution center location was designed. By combining qualitative and quantitative methods, the hierarchical relationship of the main influence factors of supply chain distribution centers location is clarified.

scholarly journals Study on Stability of Round Tunnel Surrounding Rock

2018 ◽  
Vol 175 ◽  
pp. 04016
Author(s):  
NIU Yan ◽  
Ji Yafei ◽  
Wang Zhao
Keyword(s):  
Evaluation Criteria ◽  
Surrounding Rock ◽  
Rock Stress ◽  
Stress Release ◽  
Circular Tunnel ◽  
Tunnel Excavation ◽  
Finite Element Software ◽  
Rock Stability ◽  
The Stability ◽  
Surrounding Rock Stress

Tunnel excavation will lead to the immediate surrounding rock unloading caused by the surrounding rock stress release, the stability of the surrounding rock have a certain impact. In this paper, finite element software ANSYS and finite difference software FLAC3D are used to simulate the excavation and lining process of circular tunnel. The influence of excavation on the rock stability around circular tunnel is analyzed, and the effect of applying lining on the stability of surrounding rock is analyzed. Evaluation criteria selection hole displacement, stress and plastic area of three factors.

scholarly journals Photodegradation of the benzothiostrobin in solution and on soil and glass surface

2017 ◽  
Vol 76 (2) ◽  
pp. 364-372 ◽  
Author(s):  
Zihao Zhou ◽  
Yu Yang ◽  
Zhangyu Zheng ◽  
Minghua Wang
Keyword(s):  
Organic Solvent ◽  
Glass Surface ◽  
Influence Factors ◽  
Soil Surface ◽  
Ultra Performance Liquid Chromatography ◽  
Initial Concentration ◽  
Degradation Rates ◽  
Liquid Chromatography Tandem Mass ◽  
Photodegradation Products ◽  
Main Influence

The photolytic characteristics of benzothiostrobin were investigated in solution and on soil and glass surface. The main influence factors such as initial concentration, organic solvent and the aqueous environmental substances, including NO2–, NO3–, Fe2+, Fe3+, H2O2 and turbidity were investigated. Three photodegradation products of benzothiostrobin were identified by ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). The photodegradation rates of benzothiostrobin increased with decreasing initial concentration of benzothiostrobin. The degradation rates of benzothiostrobin in different organic solvent showed the following order: n-hexane > methanol > acetonitrile > acetone. The photodegradation of benzothiostrobin was promoted by Fe3+, NO2– and H2O2, and were inhibited by Fe2+ and turbidity. The presence of NO3– had no effect on photodegradation. Benzothiostrobin was photodegraded at a slower rate on soil surface and glass surface compared to its photolysis in aqueous solution. The presumed photodegradation pathway was proposed to be the cleavage of the thioether bond in benzothiostrobin.

Aeration Settling Process on Treating ASP Produced Water of Oilfield

2014 ◽  
Vol 675-677 ◽  
pp. 391-394
Author(s):  
Guang Min Liu ◽  
Xin Jia ◽  
Mei Jun Liu ◽  
Wei Zhi
Keyword(s):  
Simulation Experiment ◽  
Produced Water ◽  
Influence Factors ◽  
Suspended Solid ◽  
Content Change ◽  
Major Factors ◽  
Settling Process ◽  
Main Influence ◽  
Reliable Basis

The concentration of suspended solid, oil, HPAM, surfactant, sulfide and silicate colloid was investigated by the simulation aeration and settling experiment. The major factors that influenced the content change of suspended solid were also determined in this study to provide reliable basis for the actual process.By the simulation experiment, the main influence factors that changed the concentration of suspended solid in ASP produced water were the precipitation of HPAM

Analysis on the Influence Factors of Multi-Functional Vibration-Absorption Enclosure Wall Structures

2011 ◽  
Vol 50-51 ◽  
pp. 319-322
Author(s):  
Ming Sheng He ◽  
Jun Wei Zheng ◽  
Gui Ju Shi
Keyword(s):  
Damping Ratio ◽  
Influence Factors ◽  
Control Mode ◽  
Mass Ratio ◽  
Vibration Absorption ◽  
Wall Structures ◽  
Optimal Value ◽  
Enclosure Wall ◽  
And Control ◽  
Main Influence

Enclosure wall multi-functional vibration-absorption structures (MVEW) is a new style of damping structure, it integrates the merits of infilled frame, tuned mass control (MTMD) and the energy dissipation structures. The main influence factors of MVEW is analyzed in the paper, The results indicate that there are optimal value of the mass ratio, the stiffness ratio and the damping ratio of substructure in MVEW, and the damping effect become obvious as the increase of the number of substructure, it also shows that the best location ought to synthetically consider the number of substructure, the tuned frequency ratio and control mode instead of being fixed. In the end, the paper proposed the determine principle of the damping device’s performance parameters as well as necessary optimization of MTMD parameters according to the specific case of actual structure1.

Sign in / Sign up

Export Citation Format

Share Document