Advanced Materials Research Vols. 524-527

Abstract: Fuzzy sub-space, with analysis on generalized uncertainty of damage, is setup in this paper when topological consistency of damage fuzzy and randomness on [0,1] scale being demonstrated deeply. Furthermore, deduced under fuzzy characteristics translation are three fuzzy analytical models of damage functional, namely, half depressed distribution, swing distribution, combined swing distribution, by which, fuzzy extension territory on damage evolution is formulated here. With the representation of damage variable β probabilistic distribution as well as formulation on stochastic sub-space of damage variable, expended on the basis of extension criterion and fuzzy probability is damage model defined within generalized uncertain space, by which, introduced is fuzzy probabilistic integral algorithm of generalized uncertain damage variable that could be simulated by the forthcoming fuzzy stochastic damage constitution model based on three fuzzy functional models before. Moreover, in order to realize the joint of fuzzy input and output procedure on generalized uncertain damage variable calculation, fuzzy self-adapting stochastic damage reliability algorithm is, with the update on fuzzy stochastic finite element method within standard normal distribution probabilistic space by the help of foregoing fuzzy stochastic damage constitution model, offered in this paper on the basis of equivalent-normalization and orthogonal design theory.

Abstract: Northwest China is rich of coal energy. Mining activities bring serous impact on the environment and scarce water resources because of its shallow buried and severe mining impact. Stowing mining is one of the most effective measures to control strata movement and reduce surface subsidence. Based on the local surface widespread wind-blown sand for aggregate and combined with the knife pillar mining，this paper introduces the stowing mining technology.

Abstract: In gas prediction and prevention , it is important for the Mine-managers to know coal-seam gas-pressure. Because of the limitation of geological conditions,some seam can not use upward bore to measure gas pressure,so using downward bore is essential, but coal-seam gas-pressure measure is difficult on the this condition(QixiangYu. 1992) . In order to resolve this problem, the way of “subsection and time-sharing hole sealing” is propounded in this paper.by using this method, the crevice water of wall rock is blockaded effectively and the influence of measure gas pressure by crevice water is avoided. It can provide guarantee to measure gas pressure under the complicated condition.By the local practice,good effect is achieved.

Abstract: The article proposed the concept of correlative income from mineral resources exploration and development and described connotation and function of that. It was held that correlative income from mineral resources exploration and development refers to all the correlative income and fees produced through the series processes of prospecting, exploration, mining, processing, and transportation of mineral resources. It analyzed and studied the source of correlative income from mineral resources exploration and development, showed the composition of it, deeply analyzed the generation and distribution of it, and offered the principle of it at last. The conclusion of the article could help to distinguish various incomes which come from the process of developing and utilizing mineral resources, and help to distribute income reasonably. Then, the ownership income of state could be clarified and safeguarded.

Abstract: The coal side deformation and sliding can not be effectively controlled by use of the traditional bolt or cable support in the high stress crushed surrounding rock and large section roadway. For solving this problem, the new prestressed truss support technology is put forward, and its supporting principles of roof and two walls are stated. The mechanical model of cable-channel steel truss is established, and then the tensile strength of the cable and the maximum deflection of the channel steel are derived. By way of field investigation, mechanics theory analysis and actual production condition, the scheme is defined and applied in the replacement roadway. Measurement results of surrounding rock behavior show that the coal side displacement is no more than 254mm and the roof convergence is less than 172mm. Apparent economic and technical profits have been achieved.

Abstract: In order to study the effects of CBM temperature-rising desorption, the isothermal adsorption /desorption experiments on three coal-ranks （anthracite，coking coal and lignite）at different temperatures were designed based on the traditional CBM decompression desorption. The experimental results show that temperature-rising desorption is more effective in high-rank coal and raising the temperature of high-rank coal reservoir can reduce the negative effect of Coal Matrix Shrinkage in the process of production and improve the permeability of coal reservoir. It is also revealed that the technique of temperature-rising desorption used in higher-rank coal reservoir can enhance CBM recovery ratio. This study has provided theoretical support for the application of temperature-rising desorption technique to practical diacharging and mining projects and can effectively solve gas production “bottleneck” problem.

Abstract: It is great important for the development of China’s uranium mining to efficiently extract low seepage sandstone uranium ore rock. It is the objective of this paper to present the effects of the structural characteristics of the low seepage sandstone uranium ore rock on permeability. Samples of sandstone from a uranium mine in XinJiang province were used to carry out experimental research on permeability. These tests were carried out on ore rock with particle size and distribution characteristics determined by a homemade permeability test device. The research indicates that the sandstone uranium deposits may be classified as low seepage because the particle size falls within the range 0.1~1.6mm, that the distribution of particle sizes observed conforms to low seepage fractal characteristics, the permeability decreases when the value of the ore particle size distribution of fractal dimensions increases, and the permeability decreases with particle size decreasing, and that the decrease of the permeability is not a linear change, but is an obviously exponentially decreasing functional relationship.

Abstract: In order to study the influence of different fault dip angle on fault activation under different mining conditions, the supporting pressure distribution model of corresponding working face is established and the formula of stress on the fault plane is also derived. Combined with the Mohr-Coulomb yield criterion, the essay summarizes the critical factor of fault rock yield activation. The contributions of fault dip angle and base disturbance to critical factors are further analyzed. At the same time, by using FLAC software, the rules of different inclined fault in mining whose floor of the plastic zone around the propagation and the variation of the stress field characteristics are analyzed. The simulation results showed that connected condition of floor plastic zone and the regularity influence floor water inrush. The research shows: small obliquity faults and shallow area faults are more likely to be activated, and small obliquity faults are more susceptible to affect disturbance leading to the bottom of plastic failure. The results would have an important value to preventing against fault water inrush accident and projecting the waterproof pillar.

Abstract: For the support problem of set-up room to be 7.8m wide with thick and broken coal roof in Pangpangta coal mine, the truss cable support system is adopted to control the set-up room surrounding rock. The main support parameters, such as cable length, cable angle and distance between orifice and side of the truss cable support system are simulated and optimally designed by using numerical simulation software FLAC^3D, by which the support scheme is designed reasonably. The support scheme is successfully tested at set-up room No. 10101 in Pangpangta mine. The set-up room deformation is small, and the support system is safe and reliable. This kind of support technology can be widely used in the similar set-up rooms.

Abstract: Based on lots of gas emission from gob in mining faces, and the actual situation that gas accumulates in the top corner of the working face in Chang Ping coal mine, it is introduced in the paper that the successful experience about the technology of gas drainage to gob with long bore-holes along roof strike, the conclusion would be had obtained obvious security and economic benefits.