Applied Mechanics and Materials Vols. 295-298

Abstract: To develop an appropriate rock damage criterion, a proper description of structure of the rock mass, indicating potential key rock blocks, its mechanical properties as well as the type and characteristics of the explosive used and the blasting mechanism, drill hole pattern, use of delayed detonation and sequence of blasting are required. In this paper the intended damage criterion has to be based on the mechanical response of the rock to cyclic loading which is related to the size of the blast and type of explosive used.

Abstract: The oil-in-water emulsifier is a key component of the emulsion explosive, experimental apparatus to simulate the environment of deepwater charge reusable research T155; the Span-80 are two commonly used emulsifier content of the emulsion explosive anti-Sham pressure performance the impact. Experimental results show that: T155, Span-80 emulsified explosive sample at the initial stage as the emulsifier content improved explosive performance and anti sham pressure performance has significantly improved, when the content is increased to a certain value against Sham pressure performance improvement is no longer a significant contribution small explosive performance; T155 content of 2% and 3% in Span-80, the emulsion explosives at this time there are a better anti-deepwater pressure performance and explosive performance.

Abstract: In the pre-drill prediction drillability, the current rock drillability evaluation method by drilling coring and laboratory test, combining with logging data to establish the relationship between the acoustic time and drillability. At last, to get drillability profile. Drillability predicted value often has a large error because of downhole lithology having complex, uneven thickness of the layers, it is difficult to meet the construction requirements, so the application is ineffective. New prediction methods about a three-dimensional drillability are introduced by this article, taking into account the different layers of different lithology ,discussing different layers, combining with fractal interpolation method to significantly improve the prediction accuracy before drilling, having provided favorable conditions for drilling speed and reducing the cost of drilling.

Abstract: Based on the geological conditions of 6# coal seam and 8# coal seam in Xieqiao Coal Mine, to determine reasonable entry layout of lower seam in multi-seam mining, alternate internal entry layout, alternate exterior entry layout and overlapping entry layout were put forward and simulated by FLAC3D. Then stress distribution and displacement characteristics of surrounding rock were analyzed in the three ways of entry layout, leading to the conclusion that alternate internal entry layout is a better choice for multi-seam mining, for which makes the entry located in stress reduce zone and reduces the influence of abutment pressure of upper coal seam mining to a certain extent,. And the mining practice of Xieqiao Coal Mine tested the results, which will offer a beneficial reference for entry layout with similar geological conditions in multi-seam mining.

Abstract: The displacement and stress of adjacent existing tunnel at different times after the new tunnel built are calculated by FEA models with ANSYS. The effects of each counting parameter of tunnel lining to results are analyzed, and some conclusions are educed, which can give references to the design and construction of siminiar engineerings.

Abstract: In order to select the reasonable coal mining method of large mine, analysing the main factors of affecting the mining method and establishing the evaluation index system of coal mining methods selection to large mine, then using Analytic Hierarchy Process (AHP) to calculate the weight of each index. The grey correlation evaluation model of mining method was established for large mine by using grey relevance analysis of the grey theory, this model can calculate grey relevance coefficient and grey relevance degree between the evaluation system indexes by determining the reference sequence and comparative sequence of the evaluation object, and according to the size of the grey relevance degree to determine the reasonable coal mining methods. The evaluating case analysis shows this model is practical to select the reasonable coal mining method of large mine, and it is a scientific decision-making method.

Abstract: In order to predict accurately gas concentration in driving ventilation process under different gas emission and different ventilation scheme conditions in coal mine, based on the analysis of various ventilation factors, the prediction model structure of gas concentration of driving ventilation was designed based on RBF neural network in this paper. Then MATLAB software and the observation data obtained from the coal mine sites were used to establish and test the prediction models of gas concentration in driving ventilation process based RBF. And then the better accuracy and performance prediction model based on RBF were obtained through testing and comparative analysis. Finally, the prediction model of gas concentration was applied to forecast gas concentration of heading face under different driving ventilation equipment layout and configuration parameters in the actual coal mine and then confirm the reasonable effective and energy-saving driving ventilation equipment layout and configuration parameter scheme. The research results can provide a certain theory basis for dynamics prediction of gas concentration and ventilation scheme optimization in the driving ventilation process.

Abstract: This article discusses a series of technologies of comprehensive utilization of coal resources,and puts forward countermeasures of comprehensive utilization of coal resources.These are benefical for comprehensive utilization of coal resources and maximize economic and social interests of coal resources.

Abstract: Aims at the problem on surface subsidence calamity in loess gully region , applies on the best result of surface subsidence disaster by mining, basis on analysis prediction model of level surface and character of surface movement and deformation in gully region, and combines the character of landslide and slip accompanies hilly surface movement and deformation by mining, and establishes theory model of surface movement and deformation and determine model of the landslide may occur, it is further verified correctness and rationality by project, and It has some significance on hilly surface movement and deformation and protect the object of risk assessment.

Abstract: The evaluation of engineering-construction suitability in mining subsidence area is a comprehensively decisive issue which is multi-factor and multi-level. Based on the analysis of basic influential factors of the engineering-construction suitability and the special influential factors of mining subsidence-area, uses the model and the technical route of Analytic Hierarchy Process (AHP), a hierarchical comprehensive evaluation index system is constructed. After making the qualitative and quantitative analysis, every index is assigned a value in different levels and the calculation model for evaluation on the suitability of land used for engineering construction in the mining subsidence area is built with the method of multi-factor weighted composite index. At last, the classification standard of suitability is offered On the basis of above-mentioned analysis.