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- Coal pillar protection size 煤柱尺寸
- wide coal pillar protecting the roadway 大煤柱护巷
- 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。
- Determining rational width of small coal pillar protecting roadways driving along next gob supported by bolting 锚杆支护沿空掘巷合理位置的确定
- 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。
- Secondly, simulation elicits wall rock transmogrification under the different coal pillar and different stress. 其次模拟研究分析了留设煤柱宽度不同时以及地应力大小不一时沿空巷道围岩变形情况，得到了一些认识；
- The coal pillar has mode-soft behaviour, so it is possible to estimate the destabilization. 煤柱失稳还具有模态软化特性，可以对失稳的可能性进行佑计。
- 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。
- Coal pillar for protection of buildings 保护煤柱
- coal pillar for protection of builings 保护煤柱
- 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；
- In the plastic limit analysis,the wrinkler's plate is smartly analyzed in yield-line theory to get the critical compression strength of the coal pillar. 在分析过程中,利用机动法对温克尔地基板(弹簧支撑板)进行了塑性极限分析,得出了煤柱抗压强度的临界值。
- The results show that the coal pillar destabilization has catastrophe and gradualness paths, which correspondingly cause the violent destroy and the gradualness "weak" destroy. 结果表明：煤柱失稳具有突变、缓慢2条路径，相应地形成了煤柱失稳的突然猛烈破坏和较缓慢的“瘫软”破坏；
- 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 formula of necessary and sufficient condition for instability and failure of strip coal pillar along strike is obtained according to the cusp catastrophi... 并根据模型对走向条带煤柱破坏失稳的机理进行了分析。为条带开采煤柱的稳定性及破坏失稳研究提供了新的理论方法。
- Also a comparison of the plastic status of the coal pillar is made respectively considering uncoupled and coupled situations, and the deformation and failure laws are researched. 结果表明：两种情况下的塑性区均呈现“马鞍”形状，这与以往的大量实测结果相一致。
- 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。
- Through studing the coal pillar width Parameter in 3246 along stull machine tunnel in QiDong Coal mine, ascertainment the coal pillar width Parameter in Similar geologic condition . 通过对我矿3246沿空机巷煤柱宽度参数的研究,确定了类似地质条件下的煤柱宽度参数,为今后的采区设计提供了理论依据。
- 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。
- At the critical point of destabilization, the destabilization of the coal pillar is divergent, which means the small changes of the control variables will cause the destabilization of the coal pillar. 在失稳临界点附近煤柱失稳具有发散性，即控制变量有微小的变化就会引起煤柱失稳；
