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On the roof composite roof accident prevention

Resistance: aS. dd. On the side of the fracture surface may seem off the rock has been off and push down block hexahedral upward pull, in addition, Ying Shan corner pillars will push down on the hexahedral have a resistance. The friction is due to rock and broken clasp hexahedral refuse generated, in case of vibration, the clamping force will be reduced, so that friction will be smaller, may result in thrust over the next six-sided total resistance, resulting in collapse surface pure accident J0 From the perspective of the support that the problem is not with how the pillars supporting force, but rather support the stability of the system, if the hexahedron is a good stability under the able direction of low resistance from the level of support. You can also push down the block hexahedral. From the above analysis and mechanical model shows, the formation of thrust roof fall in on condition that: 1) support the low stability of the difference between setting load; 2) coal seam a certain angle; 3) The roof has a large area of separation three conditions are fulfilled indispensable. 3 Control Techniques Control Technology and compound roof face roof fall, divided into 10 1 Xiong Xiaoying, Li Junbin, cover the military: an accident of roof composite roof 61 of lung governance measures: 1) clear - identify the geological conditions, The exact pole grip composite roof lithology, structure, thickness, angle, structure and so on. 2) strict - strict management, in a clear, based on an establishment of procedures for the operation; strict engineering specifications and quality; in strict accordance with chapter operations. 3) Anti - prevent roof separation, and to take measures to protect the integrity of the roof. Starting from the anti-driving, and if the construction of complex roof off cut control requirements must be determined by cut in layout; driving up and down trough does not destroy the roof; try to avoid bias and face down trough arrangement. To raise the pillar mining setting load, according to the initial setting load of Huainan Mining empirical formula, consider the safety factor of 1.5 times,[link widoczny dla zalogowanych], taking different straight top or irregular rock caving zone thickness (ho) and the seam dip angle ( a),[link widoczny dla zalogowanych], were calculated in Table 2. Calculation 2 capsule support to save the value of tough wrapped 4) Pseudo - take oblique manner. Based on experience, the exploitation of coal seams dip at 35o below, the number of pseudo-gradient control in 50-1o. ; 35o a 55. , The local up to six. The big dip face, the largest pseudo-angle shall not exceed 15. Also the initial mining phase must cut mining. To ensure that when the first cut caving mining 1/3-1/2 length of appropriate long face, while non-reverse back. 5) low - during the early release due to lower cutting height, cutting height control of 1.6-1.8m. . 6) Stability - Setting up of special support or use other methods to increase support vertical and horizontal stability. 7) wide - and expand the control of the top distance, often face wider than normal 1-2m. Cool

Far - distance back to the column, under special circumstances can also use pull-down sub-cow back to the column. 9) monitor - set up supervision and inspection measures and top team performance. lO) irrigation - who are likely to form layered composite roof face, do a good job filling work on the layered, supplemented by sprinkling pulp and fill grouting before harvest to improve the regeneration of the integrity of the roof. 1O above measures, is of a universal,[link widoczny dla zalogowanych], some measures may not be applicable to some face in the practical work, must address the specific characteristics of each face, prepared in accordance with the above-mentioned possible technical measures to introduce comprehensive prevention and control, improve production safety. References: [1] rafters of the catfish. Concise Guide to Elasticity [M]. Beijing: Higher Education Press, l983.161-175. [2] Jia Xiangyun. Refeeding law easy falling roof buildings under its control [J]. Pressure and pull the top of mine management. 1993. 2:40-43. [3] Ming-Gao Qian. He Jian Lian. On theory of rock pressure scale mining [J]. China University of Mining Technology. 1994,3:28-31. (Continued from page 53) 4 Conclusion AUTODESK extended to our company's products, references to China: engineering and technical community has brought new technology,[link widoczny dla zalogowanych], its success has also brought E1] Wang Ping. CAD General technical specifications [M]. Beijing; Standards Press of China,[link widoczny dla zalogowanych], experience in marketing. In recent years, China also has several successful 1995.364 ~ 399. CAD software CAD software products in the domestic market has been compared [2] Fan Yuqing, Fengxiu Juan, Zhou Jianhua. CAD software development [M]. Beijing: Beijing is developing rapidly. As China's market economy and the further development of the University of Aeronautics and Astronautics Press, 1996.35 \CAD software to further enhance the level of domestic commercial CAD [3] Guo Guoqing. Shop the market business management - theory and model [M]. Beijing: China CAD software, the software will in the international market place. People, especially University Press -1996.46 *

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