Applied Mechanics and Materials Vol. 707

Abstract: According to functional characteristics of different regions of the ventilation network, the complicated ventilation network can be further divided into non-overlapping and exhaustive safety subregions, which can provide scientific basis on classification guidance for ventilation analysis in a concise point of view. Therefore, it is of great application significance. Specifically, a method is proposed to divide safety subregions of the ventilation network. Then, six different safety subregions are defined, and they are air-inlet subregion, air-outlet subregion, air-consuming subregion, upstream of air-consuming subregion, downstream of air-consuming subregion and bypass subregion. After that, with an air-consuming spot (working face and heading face) as the center, depth-first search (DFS) algorithm is adopted to perform traversal analysis on coalmine ventilation network. Besides, ventilation network partition is achieved in combination with safety subregion partition algorithm. The method proposed here can be used for coalmine safety production analysis and management. Finally, Huangling coalmine is taken as an example to verify the correctness and feasibility of the method proposed.

Abstract: Due to poor coalmine monitoring system data utilization and relatively high threshold for application of most application software in ventilation safety field, a multi-perspective coalmine ventilation management technology, with the goal of daily ventilation safety management, is introduced based on the real-time data from the coalmine monitoring system. Specifically, data acquisition unit is adopted to collect monitoring data in a real-time manner, and then integration of ventilation and coalmine gas data is made. After that, real-time online data analysis and display can be realized by using smart guidance and multi-screen linkage technologies according to chained features of the data. In this way, daily management interfaces based on specialized knowledge are shown in a friendly manner. Therefore, the technology proposed here can greatly improve coalmine management level and work efficiency. At the end, Huangling No. 2 coalmine is taken as an example to validate the relative technologies.

Abstract: According to GB/T3286.1-2012(The determination of calcium oxide and magnesium oxide content in limestone and dolomite), the mathematical model of magnesium oxide content determination in limestone by atomic absorption spectrometry was established. The various uncertainty factors of different elements for a sample were discussed and compared in the testing process. The confidence interval for the measurement result was (0.74±0.03)%,k=2 in uncertainty evaluation .The results showed that the variability of working curve and accuracy of standard solution volume for working curve were main influence factors of uncertainty. It could effectively reduce the uncertainty from the perspective of the main factors,and improve the quality of analysis.

Abstract: The discontinuity’s surface topography is often assumed as smooth and straight. To overcome non-considering roughness of discontinuity, direct shear numerical experiment is proposed to research influences of discontinuous roughness on its strength. Firstly, based on researched mechanical properties of discontinuity, the laws how asperity inclination angles and asperity heights of discontinuity and the mechanical behavior of discontinuity are studied. The results show that the failure of discontinuity considering roughness is not instantaneous. It is a complex process which goes through energy accumulation. The cohesive force increases with asperity inclination angle and asperity height increasing. The inner friction angle also goes through the same changes. However, when the normal stress reaches 500kPa for asperity inclination angle and 700kPa for asperity height, the shear strength experiences a decreasing process.

Abstract: Hydrogeochemy data is not only applied to the analysis of spatial and temporal variations of groundwater quality, but also provide information about groundwater hydrodynamic environment. To explore the cause, groundwater recharge source, etc., the hydrogeochemical analysis method has become to be a commonly used research techniques. Based on the geological data resent years,this article synthetically analyses thermal reservoir characteristic,and geochemical characteristic,and thinks that Yiliang geothermal field is a stratabound low temperature geothermal field.The thermal reservoir is Dengying Formation (Sinian). Hydrogeochemical field is determined by the hydrogeology of a geothermal field. This paper also discusses the chemical distribution characteristics of thermal reservoir fluid water, and the relationship between fluid chemical composition and temperature, etc. While chemical characteristics of reservoir fluid and the other basic geological characteristics of geothermal standard can be used as the reference to the planning and development.

Abstract: The earth is a huge heat reservoir and contains amounts of heat. The geothermal internal heat is about50000 times more than the energy in the oil and gas resources. In order to investigate the occurrence and formation of geothermal resources in Yiliang basin, several methods, such as electrical sounding, Very low frequency electromagnetic method, and Electrostatic α-card method are applied in the exploration area. The geothermal resource survey of the Yiliang basin has been carried out. Based on the above results, two investigation wells have been designed at the location of favorable geological conditions in the exploration area. The application of multiple geophysical prospecting methods obtains preferable effort in geothermal exploration and provides meaningful reference for the area with lower level of the geothermal survey work.

Abstract: China has huge shale gas resources potential. The exploitation of shale gas can effectively reduce atmosphere pollution and relieve the energy shortage in China. Organic rich shale in pre-Cambrian period mainly lies to North China and Yangtze areas. The shales were developed in continental shelf and restricted marine basin. The distribution is stable with the thickness ranging from 10m-150m. The geochemistry characteristics are favored for shale gas accumulation for pre-Cambrian shale. The shale mineral is mainly quartz and feldspar. The pre-Cambrian formations have favored geological condition for shale gas accumulation. The favored intervals and regions for development of shale gas are Doushantuo shale in Upper Yangtze areas and Hongshuizhuang shale in northern Hebei Province or Jianchang Basin in western Liaoning Province.

Abstract: Firstly, a model is established in Pro/E and imported into ANSYS. Static analysis is done through imposed corresponding boundary condition and loads in the condition of fully load. And then, testing its strength can meet the requirements. At the same time, the modal analysis of the third to the tenth steps is carried out and gets the nature frequency under the driving axle housing’s Free State. The vibration performance is analyzed at last.

Abstract: In the modern industrial areas, monitoring technology combined with Internet is very popular by enterprises and research workers. In this paper, the remote monitoring system based on Internet technology has been studied, PLC control and operation of the terminal as the site is used, collected field data through the PC and the web server, analog data to achieve a live remote users in real-time viewing and real-time control of field devices, through collection of data transmitted over the Internet. Specific monitoring system architecture is studied in detail in this article, and specific design.

Abstract: Water sprays shielding device for transport vehicle, by use of its own power system and storage devices, make the gases within the air tank filling the water storage tank, and jet out from the small hole of roof-shaped spray tube, by means of cyclone atomizing, to form water sprays wall with shielding effect at the top and around the transport vehicle, In order to eliminate exposure symptoms for transport vehicle in the optical, infrared and radar band, to improve the battlefield viability of transport vehicles.