CAJ | 학술논문

在完善平面应变条件下 Drucker-Prager 内切圆屈服准则推导过程的基础上,推导出Drucker-Prager 内切圆向外切圆直接转换系数,及内摩擦角强度增加系数的适用范围,提出有限元强度增加的非连续介质极限分析方法.建立由煤层和上覆岩层组成的综放开采有限元模型,通过煤岩体强度增加获得工作面周期来压时顶煤、上覆岩层的极限状态,以及上覆岩层的垮落形状和裂隙带分布,并采取经验方法验证冒落带、裂隙带高度的可靠性,从而为非连续介质临界状态特征分析提供一种新的分析方法.
재완선평면응변조건하 Drucker-Prager 내절원굴복준칙추도과정적기출상,추도출Drucker-Prager 내절원향외절원직접전환계수,급내마찰각강도증가계수적괄용범위,제출유한원강도증가적비련속개질겁한분석방법.건립유매층화상복암층조성적종방개채유한원모형,통과매암체강도증가획득공작면주기래압시정매、상복암층적겁한상태,이급상복암층적과락형상화렬극대분포,병채취경험방법험증모락대、렬극대고도적가고성,종이위비련속개질림계상태특정분석제공일충신적분석방법.
Based on the improving the derivation process on the yielding criterion of Drucker-Prager incircle under the condition of plain strain, the direct coefficient of transforming from Drucker-Prager incircle to circum-circle and the suitable application scope of strength increase on the internal friction angle have been deduced. Then based on the strength increase FEM, the limit analysis method of dis-crete medium has been put forward. The FEM model of the fully mechanized caving mine formed by coal seam and overlying strata has been built up. By the over-stratum and coal strength increasing, the model reaches its critical state in the roof and overlying strata under the periodic weighting. And the roof caving surface shape and the fissure distribution have been obtained automatically. The result of caving and fissure height by strength increase FEM has been confirmed by empirical method, resulting from which, a new method to analyze the features of discrete media of critical state has been provided.