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- The results indicate that the width of coal pillar has a great influence on the stress distribution of the gob-side entry. 研究表明:留设煤柱的宽度对孤岛面沿空巷道的应力分布有较大影响;
- Width of coal pillar 煤柱宽度
- Numerical simulation research of reasonable width of coal pillars in fully mechanized sublevel caving coalface with steep gradient 大倾角综放面合理区段煤柱宽度数值模拟研究
- The optimized Width of Narrow Coal Pillar 窄煤柱最佳宽度
- The roof rock was assumed in the elastic state,established the mechanical model of coal pillar and roof system. 假设顶板岩层处于弹性工作状态情况下,建立了煤柱-顶板系统的力学模型。
- When the destabilization of the coal pillar occurred, it needs much more strength of coal pillar to restore to the steady state than that when destroying. 煤柱一旦失稳,如要使其恢复到稳定状态,需要的煤柱强度要比煤柱破坏时的强度大的多;
- The stability of coal pillar of the short-wall mining was analyzed systemically by numerical simulation with the rock failure process analysis software (RFPA2D). 采用岩石破裂过程分析软件RFPA2D系统,对短壁机械化开采的煤柱稳定性进行数值计算与分析。
- Because the width of basemeat is small and vertical load is main load,the whole stability must be calculated in the design of coal mine steel headframe. 煤矿钢井架底座宽度小,纵向荷载为主要荷载,设计时应计算整体稳定。
- We know that hydraulic extrusion cracked coal bed of working-face, advanced the maximum main stress zone,improved the width of flaw zone,lowing the fatalness of coal outbrusting. 通过对3246风巷高压注水试验,水力挤出使工作面前方的煤体压裂,集中应力区向前推移,卸压带宽度增加,降低了煤的突出危险性,起到了消突作用。
- The width of the room is 20 feet. 这房间宽二十英尺。
- It is indicated that the span and flexural stiffness of cavern roof, the dimension and brittleness of coal pillar, the uniformity of coal material and the size of mineral grain are the important factors influencing rock burst of coal pillar. 分析表明,顶板的跨径、顶板的抗弯刚度、煤柱的尺寸、谋柱的脆性、煤岩材料的均匀性和矿物颗粒的大小是煤柱岩爆的重要影响因素。
- Put forward redistribution of stress in the mining area and Domino effect caused by unstability of coal pillar underground, resulting in sudden roof caving in the gob and surface subsidence. 提出了采场内煤柱失稳破坏引起采场应力重新分布,出现煤柱群连续失稳破坏的多米诺效应,从而导致采空区顶板大面积突然垮落和地表整体塌陷。
- Abstract This paper studies the deformation - failure of coal by means of white light digital speckle correlation method to measure the localization band width of coal deformation quantitatively. 摘 要 本文采用白光数字散斑相关方法对煤在单轴压缩下变形破坏进行研究,定量的测出了煤的变形局部化带宽度。
- The displacement angle of strata has a great bearing on the size of coal pillar for protection of buildings on very thick unconsolidated layers,and has a great economic potentials. 地层移动角参数对巨厚松散层矿井的建筑物保护煤柱尺寸影响很大,经济潜力十分巨大。
- We need to replenish our stocks of coal. 我们需要再次补充煤的储备。
- He paced out the length and width of the room. 他用步子量出那房间的长度和宽度。
- Prohibition was laid on the export of coal. 禁止煤炭输出。
- A space equal to half the width of an em. m字体的一半大小
- Choice of Coal Pillar Width for Gob Side Entry Retaining in Complex Condition 复杂条件下沿空掘巷煤柱宽度的选择
- He put a shovel of coal on to the fire. 他往火炉里加了一铲煤。