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Furthermore, it analyzes other factors that affect the stability of tunnels, such as structural characteristics of surrounding rock, mechanics properties of rock mass and construction methods.
Furthermore, it analyzes other factors that affect the stability of tunnels, such as structural characteristics of surrounding rock, mechanics properties of rock mass and construction methods.
Mechanical properties of rock mass.
There are many factors affecting the formation of natural stress field of crustal rock, among which the most important factors are those that are associated with gravity, topography and tectonic movement.
The tunnel span is also an important factor affecting the stability of the tunnel vault, and it is a limiting factor to tunnel floor failure depth.

Machined surface quality improvement measures affecting factors and research Hongcai Yang1, a, Mingqing WU2,b 1Xijing University, Shaanxi Xi'an,710123,China; 2Shandong Transport Vocational College ,Shandong Weifang ,261206,China; aE-mail: yhc630619@163.com bE-mail:wmq1977@qq.com Keywords: Machining; surface quality; influencing factors; Control Measures Abstract.
This paper mainly affect parts of the surface roughness factor, parts of the surface layer of the physical and mechanical properties (surface work hardening, residual stress, microstructure change and grinding burn), surface quality performance parts and other factors affecting the analysis and research to improve the quality of machined surface process measures.
Factors affecting the quality of the workpiece surface 1.1 Process Systems vibration of the workpiece surface quality In the process of the system during machining vibrations sometimes occur that the cutting edge of the tool and the workpiece being cut between the surfaces of the cutting movement than the nominal addition, there will be a cyclical relative movement.
Because the factors that affect the surface quality is multifaceted, only by understanding and mastering effects machined surface quality factors before in the production practice, take appropriate technical measures, on the surface quality according to the need to introduce more economic suitability requirements, fewer parts quality defects due to surface quality problems caused by the processing, thus improving mechanical product performance, life and reliability.
References [1] Kouyuan Zhe, affect the machining surface quality factor analysis [J].

Factors Analysis of Mechanical Properties on AT/EPDM Rubber Composite Hao Guo1, a, Qingguo Tangb, *, Jinsheng Liang, Yan Ding, Lijuan Wang and Yulong Du 1Institute of Power Source and Ecomaterials Science，Hebei University of Technology, Tianjin 300130, China aguohao422@yahoo.com.cn, *bqingguo_tang@hebut.edu.cn Keywords: attapulgite, titanate, EPDM, rubber composite, mechanical property Abstract.
During rubber processing, many factors can affect the mechanical properties of rubber composite.
According to previous researches, the content of coupling agent and fillers can significantly affect the properties of rubber composites [7], while the temperature of rolls is also an important factor on mechanical properties of rubber productions [10, 11], however there is little information available in literatures about the effect of processing ambient temperature on the properties of rubber composites and the influence of titanate coupling agent on the mechanical properties of AT/EPDM composite.
The effect of the factors including ambient temperature and content of coupling agent and OAT were investigated on the mechanical properties of AT/EPDM rubber composite. 2.
Fig. 1 Effect of coupling agent content on mechanical properties of AT/EPDM Fig. 2 Effect of OAT content on mechanical properties of AT/EPDM 3.2 Effect of OAT content on mechanical properties of rubber composite As shown in Fig. 2, the stress at 100% elongation and stress at 300% elongation of rubber composite decrease gradually with the increase content of OAT.

In this study, full factorial design analysis was used to examine the effects of factors and their combination interactions on mechanical properties.
In this study, two-level full factorial design approach was employed to examina the effect of factors (ATH, MMT and irradiation dosage) on the mechanical properties (tensile strength and elongation at break) of LDPE-EVA composites.
According to Pareto chart (Fig.1(a)), the irradiation dosage factor was the second most significant factor in affecting the tensile strength.
Summary In conclusion, the ATH loading level is the most significant factor in affecting the mechanical properties (tensile strength and elongation at break) of LDPE-EVA blends.
He, Factorial design investigation on two-way quaternary factors of thermal aging of chlorinated nitrile latex tensile properties, J.

Therefore, besides building material mechanical properties and the cost, the structural designer also need to focus on the durability of reinforced concrete.
Introduction Nowadays, designers should consider not only the mechanical properties of structural building materials or input costs, but also the durability of the structure.
Factors affecting the durability of reinforced concrete Steel corrosion.
Therefore, factors affecting the corrosion rate of the steel need to be analyzed.
In addition, not only the mechanical properties of structural and building materials costs designers need to pay attention once put to use, but also need to consider the durability of concrete.

Factors Effecting the Fracture Strength of Freestanding Diamond Films J.H.
However, up to now, no systematic data have ever been published in concerning the mechanical properties.
However, there were no systematic studies in concerning the effect of the film quality on the mechanical properties of the freestanding diamond films.
Substrate temperature is the most important deposition parameter in affecting the fracture strength of the freestanding diamond films.
Li et al., A Review on Mechanical Properties of Freestanding Diamond Films, Advanced materials Rsearch, 490-495 (2012) 3059-3064 [10] F.X.

Study on Factors Affecting Properties of Silica Liu Quanxiao*, Xu Wencai, Lv Yubin, Li Jinli Beijing Key Laboratory of Printing & Packaging Materials and Technology, Beijing Institute of Graphic Communication, Beijing, 102600, China *Corresponding Email: drllqx@163.com Keyword: silica, precipitation method, specific surface area, DBP absorption value, particle size.
Abstract: Silica was prepared by precipitation method in the laboratory, and the factors which affect the performance of silica were evaluated.
When it is dried, the tri-particles are formatted and can affect the properties of silica.
The drying devices and drying conditions can also affect the properties of silica.
Conclusions (1) When the silica is prepared, the processing conditions will affect the size and formation of first particle and second particle, they are the most important factors which affect the properties of silica.

Analysis of Factors Influencing the Performance of Q460 Steel Zhuling Yan （Yan'an, Shan'xi, China, School of Architecture of Yan'an University,716000） （yzhl20081@126.com） Keywords: steel building structure; Q460; steel material; mechanical property; influence factor Abstract: With the development of technology, steel structures have been gaining increasingly widespread application, and the scope of research of steel types is also becoming increasingly broad.
This paper introduces the research status of Q460 steel, describes its mechanical properties and the requirements for steels used in steel building structures, and analyzes the main factors influencing the properties of Q460 steel, providing some reference for practical engineering application of Q460 steel.
Mechanical properties of Q460 steel 1) Mechanical performance indices of Q460 steel Q460 steel is a low-alloy high-strength steel with a theoretical yield strength ()of 460 MPa, like other steels, the strength properties of Q460 steel are measured by proportional limit , elastic limit , yield strength and tensile strength ; plastic properties are measured by elongation , the strength and plastic performance indices are obtained by unidirectional room temperature static-load tensile test; toughness properties of Q460 steel are measured by impact toughness test values; and metallurgical defects and comprehensive mechanical properties of Q460 steel are examined by cold bend test.
But these properties are influenced by the chemical composition, smelting process and other factors of the steel; to ensure the good performance of the steel, we must begin with the analysis and study of its influence factors. 2) Steel structure's requirements for performance of Q460 steel Q460 steel should possess the above mechanical properties, especially as a type of steel used in steel building structures, like Q235, Q345, Q390 and Q420 steels, Q460 steel must meet the following requirements: First, Q460 steel must have relatively high tensile strength and yield strength .
Therefore, the mechanical properties and influence factors of Q460 steel shall be analyzed and studied, various mechanical properties of Q460 steel shall be further studied, which shall be applied reasonably in practice engineering based on the consideration of various influence factors of Q460 steel.

China a qyq5991@163.com Keywords: Weld lines, Orthogonal experiment, Mechanical properties Abstract.
Influence of weld lines is important to the mechanical properties of the modified polypropylene products.
The factors which affect the mechanical properties at welding joints product vary, and how to select rational parameters is a difficult problem for production.
The velocity of filling and melt temperature are main factors affecting weld lines form.
Fig. 5 SEM in section Fig. 6 SEM in edge of weld lines Conclusions The study hereof is to confirm injection process parameters affecting the mechanical properties of the modification of polypropylene injection molded part with welding joints through orthogonal experiment.

The microstructure of the polyacrylonitrile (PAN) precursors can strongly affect the structure of the carbon fibers which determine the final mechanical properties of carbon fibers.
This may because that the supermoleculor structure of the PAN precursors can be retained in the finished fibers, which can strongly affect on the final mechanical properties of the carbon fibers [2].
The mechanical properties of the PAN precursors with different draw ratio From this analysis, we can find that the orientation of the PAN precursors give a great effect on the mechanical properties.
Summary The birefringence and the mechanical properties of the PAN precursors are measured.
Properly increasing the draw ratio results in the increase of the orientation as well as the mechanical properties.