Advanced Materials Research Vols. 962-965

Abstract: The degree of difficulty of coal seam water infusion is the important basis of pouring water into coal beds, by fully analyzing influence factors of the degree of difficulty of pouring water into coal beds, the main influence factors of pouring water into coal beds was determined and the fuzzy clustering analysis model was build which base on the depth of burying of the coal seam, crack growth degree, porosity, moist edge, water saturation value-added and consistent coefficient. By comparing evaluation result of this model with Fisher evaluation result, the model result is accuracy and reliability. According to this model to predict South decurrent 18th layer 7th face Coal Seam of Shuangyashan Mining Group Dongrong No.2 Coal Mine,the predicted results are consistent with the actual situation and offering theoretical guidance to the choice of injection water parameters .

Abstract: Environment arround the vast Hulun Buir Grassland is susceptible to mining production, especially coal mining often leads to ecological structure and function damage of mining area or causes the ecological system to change in the direction that is not conducive to the survival of mankind. However, the grassland vegetation restoration engineering, whoes practice needs urgent theoretical guidance, is necessary to be systematically included in mining engineering. In order to prepare for further research on grassland restoration of mining area, this paper systematically analysised the damage on grassland due to mining, as well as the dependence on grassland of sustainable development of Hulun Buir regional economic, and explained that grassland ecological restoration is the economic ecological engineering that closely connects to regional social development.

Abstract: With the plenty of exploitation and application of underground space, the security of underground cavern under the explosive stress wave become the problem that urgent need to be solved. This article give a comprehensive description for the explosion stress wave disturbance effect of underground caverns from three aspects, (1) summarize the current research of the blasting load characteristics and its disturbance effect of the anchored caverns from theoretical research, experimental study and numerical simulation, etc.; (2) state the research status and achievements of rock bolt in anchored cavern under explosive stress waves; (3) according to the present problems of the research for explosion stress wave disturbance effect of underground caverns put forward that adopting multi parameters analysis method, utilizing the numerical simulation technology, the disturbance effect research of anchored caverns, which will be the future development direction.

Abstract: Block model is the precondition of open-pit mine optimization boundary design and mining design. In this paper, after studying the ore deposit model that using the optimization boundary, put forward to establish ore deposit quality block model based on the proposed Sandaozhuang engineering geological profile. Using prospecting line profile CAD drawings that obtained during the exploration phase, use two-dimensional coordinate conversion three-dimensional coordinates, the profile boundary curve smoothing, apply Delaunay triangulation and other technology to establish ore body contour model. Establish the ore body quality model based on the ore body contour model, use inverse distance weighted method in geostatistics for the assignment of ore body quality model, get the Sandaozhuang open pit quality block model. And based on this to estimate the reserves, lay the foundation for the follow work of the mine.

Abstract: KONIAMBO project affiliated to the OFFSHORE OIL ENGINEERING CO., LTD is the world's first smelting plant using large modular construction and integration, which is the first integrated, modular building project with many potential risks .In this paper, project risk management system, control method and requirements were built based on risk matrix assessment method, potential risks in each stage and aspect were evaluated, controlled and managed,then risk management guarantee is provided for KONIAMBO project implementation.

Abstract: Based on the introduction of the researches on the influence of the surrounding rock strength on the anchorage performance of resin anchored bolts at home and abroad, the numerical simulation was adopted to analyse anchorage system of single bolt support small-scale by using the finite difference program FLAC3D. The results showed that the stress distributions in resin capsules and surrounding rocks were different with the different strengths of surrounding rocks. The stresses in the surrounding rocks gradually decreased with the reduction of rock strength, but the plastic zone gradually expanded. On the basis, such technological approaches were brought forward to ensure support effect in the soft rock roadways by improving the materials and formulations of the resin capsules and increasing the support density and the anchorage length appropriately.

Abstract: Aimed at the comprehensive management of gas and spontaneous combustion in goaf of 5-2S fully mechanized caving face in five district of Hongmiao coal mine. The impacts on the air flow field and concentration distribution of the goaf are analyzed, that the changes of gas drainage value, and the location of drainage outlet as well as injection capacity of nitrogen. The results show that, the larger of the volume of gas drainage, the greater risk of gas explosion and spontaneous combustion. Appropriate increasing gas drainage volume is used to ensure the safety of the working face, with injecting nitrogen or accelerating the speed of face promote. The drainage outlet location should also be in an appropriate range (5~25 m) after the break line of the face. The result has important guiding significance in goaf of inflammable thick seam of gas mine, on the selection of gas extraction parameters, which is reasonable to prevent both gas explosion accident and spontaneous combustion caused by drainage excessive.

Abstract: The reserve proportion of thin coal seam in Sichuan Province is as high as 60%, of which the extremely thin coal seam mines with the coal thickness less than 0.6m take up 34.3% in the total number of Sichuan coal mines. Exploiting the extremely thin seam called Xiayuantan in Laoyingyan Coalmine confronts so many problems, such as small working space in coalface, difficulty in transporting, high labor intensity, poor production, and low stoping efficiency. Aiming at these problems, this paper puts forward the conventionally-mechanized coal winning technology, investigates the selection, matching, organization and management of equipment in mechanized mining face. Moreover, it demonstrates the rationality of associated equipment selection, that is, MG100-TP off-pan shearer is suitable for exploiting the extremely thin coal seam mechanically. There are less workers in the mechanized mining face, the raw coal production and the stoping efficiency have been enhanced, the roof condition of workface has been improved,serious injury and any other more serious accidents have been completely eradicated. The technology obtains remarkable economic effects and safety benefits.

Abstract: The haulage roadway of Face 12501 of Tunlan mine was a large-section and soft-rock roadway, and its deformation was very large, so the original support system could not satisfy the support demands. Three optimization schemes were proposed according to the geological conditions of the roadway, and the schemes were simulated by FLAC3D. The results showed that reducing the row & line space was not a good way to improve the supporting effect, however, it would effectively reduce the maximum stress of surrounding rocks and control the development of plastic zones by using long bolts instead of anchor cables, the maximum stress was reduced from 16.5MPa to13.9MPa, and the roof’s plastic damage range was reduced from 2.8m to 1.5m. The supporting effect is significant, and it could maintain the roadway’s stability effectively.

Abstract: As the change of diameter of the bearing push-extend reamed in the size, failure pattern of soil mass around the PEMUR pile has changes. Based on the finite element method, simulated analysis has been conducted about normal stress and shear stress of soil around pile under different plate diameter size, which has qualitatively identified that the PEMUR pile bearing capacity of single pile has influence on disc diameter, application for this type of pile design provides a theoretical basis.