Advanced Materials Research Vols. 962-965

Abstract: Due to the influence of geology, mining technology, supporting strength, fully mechanized coal face sometimes would happen large area caving and weighting over great extent, causing casualties. Theoretical and experimental analysis shows, not only hard roof could happen weighting over great extent, but softer roof upon long wall face could happen, the only difference was the location of disaster and the failure forms. The paper analyzed weighting over great extent upon fully mechanized coal face with non-hard roof based on measured data. The results show that, the important factors of support break-off were the setting load of hydraulic support, drawing speed of working face and support efficiency, and it would achieve support break-off warning help to analyze the open rates of safety valve.

Abstract: In this paper,based on the fuzzy mathematics theory, established prediction function model about the surface movement deformation caused by underground mining. On the basis of the measured data of a large number of engineering, determined the fuzzy measure expression. The function model is applied to a surface movement deformation prediction in the mines, combine with the Matlab, implement the surface movement deformation’s 3D visualization. The results of prediction was coincident with the test data, illustrated that the function model has certain validity and practicability. The method provided an exploration for the reserch of Surface Movement Deformation Prediction method.

Abstract: In order to understand the characteristics and law of development of coal research in the field of safety management, the papers published data from 1993--2013 based on Web of Science database and the Java platform development CitespaceIII visualization software for scientific knowledge map drawing is used. Through the knowledge map visualization analysis, it shows the origin of the research of international coal safety management and foundation of knowledge, and its basic and frontier disciplines. The results show that: through the visual keywords co-occurrence knowledge mapping analysis, high frequency keywords and high degree of heart keyword ranked in the top 10. It also shows the hot spot area and the development trend in the research field of coal safety management; from the literature co-citation results, classical literature and knowledge of basic research on coal safety management field, it plays an important role in the development process of the research in the field of visualization; through the journal co-citation analysis of knowledge map, it gets higher yield and literature journal, such as SAFETY SCI, COAL SCI TECHNOLOGY, CHINA COAL and the like, which shows that in the study of coal safety management field quantity of periodicals, China is the first, which explains China's leading position in the field of safety management of coal.

Abstract: The accidents of coal mine can be prevented by managing the coal mine near miss efficiently. In this paper, the cause of near miss of coal mine is investigated based on literature review and field survey. The relationship between safety climate and near miss of coal mine is analyzed. The statistical analysis of survey data is done by using the software SPSS16.0 and AMOS7.0. The results indicate that the coal mine safety climate affects employee’s safety behavior and employee’s safety behavior directly affect coal mine near miss. Among them, the influences of the safety communication and safety consciousness of employee on safety behavior are most significant. Coal mining enterprises should improve safety communication skills and safety consciousness of staff by the various means and methods to reduce the occurrence of unsafe behavior, so as to prevent the near miss of coal mine.

Abstract: In view of visualization about coalmine safety production,this thesis gives a detailed of the establishment process about mine 3D geological platform and researches secondary development of CAD technology,ADO technology,ActiveX technology,VC technology, SQL \ ACCESS database technology,technology of ACIS geometric modeling and inverse distance weighted method improved, and uses theory and technology above to establishes a set of complete and geological generalization which has early warning function of 3D visualization transparent platform.

Abstract: In order to reduce the cost of stowing materials in Yuyang coal mine, and localize the stowing material, a series of experiments were conducted, which were based on the sampling and testing of aeolian sand to analyze the reaction mechanism of paste-like stowing slurry. The influence of different aeolian sand and auxiliary material content on stowing material was also studied in the experiment. Experimental results indicate that the main components of aeolian sand are SiO₂ and Al₂O₃. The stowing material density increases by 23.4% with more aeolian sand additive amount, and the material cost falls to 93 yuan/m³, reduced by 25.6%. With the increase of auxiliary gelatinization material dosage, the 28-day strength of material increases by 59.4%, the hardening rate of stowing material reaches up to 109.5%, increased by 23%, and the stowing material shows micro expansion.

Abstract: the paper determines and calculates variation of gas and heating capacity in a combustible organic rock, the experiment shows that organic sample radiating intensity is low when temperature is below 110 °C, it gradually increased more than 110 °C when the heat release rate increases considerably. the speed of CO and CO₂ production rates increased slowly nevertheless the temperature is up to 65°C and raised faster and finally enhanced dramatically. Organic rock combustion can be inhibited effectively by lowering the temperature and reduce Organic Rock oxidation velocity.

Abstract: According to the stability of open-pit slope, the main influence factors of the slope stability is analyzed firstly. Then, based on the basic principle and method of fuzzy mathematics, the slope stability analysis of fuzzy and comprehensive evaluation further more model is established and the grading index of the slope stability is determined. Finally, by analyzing an example of large open-pit mine slope engineering, the stability of the slope is evaluated. The results show that the evaluation model could consider the uncertain properties in actual slope problems,and the evaluation result is reasonable.

Abstract: The broken characters of roadway in deep in China were statistical analyzed. Taking unit length anchor body as studying element, interrelations of the maximum shear force max、cementation strength and confining pressures were analyzed, researched and development grouting cable, put forward grouting-anchor coupling support for surrounding rock control in deep. The relation between different water cement ratios (0.5:1-1:1), different grout pressures (0.5:1-1:1) and diffusion radius were analyzed by means of numerical software UDEC. The surrounding rock controlling problems of dynamic pressure impact and large deformation roadway in deep was solved in CHANGCUN mine of Lu’an coal mining area in China.

Abstract: There are many problems such as depth, high in-situ stress, high ground temperature and rockburst proneness etc. in deep mining. And it is an acknowledged and urgent mining technical puzzle about mining method of gently inclined and medium-thick ore bodies. For such an ore body in West wing of Dongguashan copper mine, if we use traditional mining method, it is hard to conquer such difficulties as high in-situ stress, large open area in roof, removal of mined ore by gravity etc. The theory of “large panel and lower sublevel height” will be easy to solve such problems. This paper use numerical technology to analyze and compare the technical and economical effectiveness for different selected mining method and its structure. The sublevel (at a height of 12 m) open stoping with back-filling by extraction in two steps is quite suitable for ensuring safety, increasing efficiency, productivity and reclaiming resource. The selected method is feasible and well worth spread.