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- Its strata behaviors are violent and affected by pillar robbing sequence. 老頂初次垮落步距較常規開採大,且失穩突然;
- Secondly, simulation elicits wall rock transmogrification under the different coal pillar and different stress. 其次模擬研究分析了留設煤柱寬度不同時以及地應力大小不一時沿空巷道圍岩變形情況,得到了一些認識;
- The coal pillar has mode-soft behaviour, so it is possible to estimate the destabilization. 煤柱失穩還具有模態軟化特性,可以對失穩的可能性進行佑計。
- The roof rock was assumed in the elastic state,established the mechanical model of coal pillar and roof system. 假設頂板岩層處於彈性工作狀態情況下,建立了煤柱-頂板系統的力學模型。
- 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:留設煤柱的寬度對孤島面沿空巷道的應力分佈有較大影響;
- 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. 在分析過程中,利用機動法對溫克爾地基板(彈簧支撐板)進行了塑性極限分析,得出了煤柱抗壓強度的臨界值。
- The results show that the coal pillar destabilization has catastrophe and gradualness paths, which correspondingly cause the violent destroy and the gradualness "weak" destroy. 結果表明:煤柱失穩具有突變、緩慢2條路徑,相應地形成了煤柱失穩的突然猛烈破壞和較緩慢的「癱軟」破壞;
- 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. 煤柱一旦失穩,如要使其恢復到穩定狀態,需要的煤柱強度要比煤柱破壞時的強度大的多;
- The formula of necessary and sufficient condition for instability and failure of strip coal pillar along strike is obtained according to the cusp catastrophi... 並根據模型對走向條帶煤柱破壞失穩的機理進行了分析。為條帶開採煤柱的穩定性及破壞失穩研究提供了新的理論方法。
- 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. 結果表明:兩種情況下的塑性區均呈現「馬鞍」形狀,這與以往的大量實測結果相一致。
- The stability of coal pillar of the short-wall mining was analyzed systemically by numerical simulation with the rock failure process analysis software (RFPA2D). 採用岩石破裂過程分析軟體RFPA2D系統,對短壁機械化開採的煤柱穩定性進行數值計算與分析。
- 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 . 通過對我礦3246沿空機巷煤柱寬度參數的研究,確定了類似地質條件下的煤柱寬度參數,為今後的採區設計提供了理論依據。
- 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,頂板的跨徑、頂板的抗彎剛度、煤柱的尺寸、謀柱的脆性、煤岩材料的均勻性和礦物顆粒的大小是煤柱岩爆的重要影響因素。
- 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. 提出了采場內煤柱失穩破壞引起采場應力重新分佈,出現煤柱群連續失穩破壞的多米諾效應,從而導致採空區頂板大面積突然垮落和地表整體塌陷。
- 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. 在失穩臨界點附近煤柱失穩具有發散性,即控制變數有微小的變化就會引起煤柱失穩;
- 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. 地層移動角參數對巨厚鬆散層礦井的建築物保護煤柱尺寸影響很大,經濟潛力十分巨大。
- The study indicates that with the increase of the coal pillar width the peak mining stress delays its appearance and the increase of the displacement and stress are not synchronous. 研究表明,綜放沿空留巷受采場礦壓影響時間和程度隨留巷煤柱寬度的增加表現出明顯帶后現象以及位移和壓力增長的不同步現象。
- Preferable safety and economy technicalbenefit may be obtained through reasonable and economical method of non coal pillar Gob-side Entry Retaining Mining and the layout of normal heading stope. 通過合理、經濟的無煤柱沿空留巷方法布置正規採煤工作面進行回採可獲得較好的安全、經濟技術效益。
- The mechanical model of key strata supported by coal pillar is set up according to the layout of coal pillars in the coalface of short wall mining. 根據短壁開採條件下保護煤柱的布設特點,建立由保護煤柱支承的關鍵層力學分析模型。
- Dividing partition coal pillars and region coal pillars, and selecting parameter are key to prevent disaster. 區分隔離煤柱和區內煤柱,選擇合理開採參數,是防止災變的關鍵。