本文選題：初始缺陷 + 超高礦柱　； 參考：《中國礦業(yè)大學學報》2017年02期

【摘要】：根據(jù)超高礦柱結(jié)構(gòu)及受力特點,并充分考慮初始幾何偏差,建立了簡化的壓桿力學模型.基于彈塑性理論對具有初始幾何缺陷的超高礦柱的撓度及內(nèi)力進行了分析,并基于Kachanov損傷理論,對超高礦柱的損傷過程和失穩(wěn)時間進行了研究.結(jié)果表明,在初始撓度的影響下,礦柱將出現(xiàn)不同程度的附加撓度,大小與初始撓度和壓力比(上覆壓力與礦柱極限荷載之比)有關(guān),隨著初始撓度和壓力比的增加而增加.工程實例分析表明,礦柱的損傷孕育時間和失穩(wěn)滯后時間與初始撓度、壓力比及抗壓強度有密切的關(guān)系,隨著壓力比和初始撓度增加,損傷孕育時間和失穩(wěn)滯后時間快速變小,抗壓強度越大,失穩(wěn)滯后時間越大,即礦柱越穩(wěn)定.
[Abstract]:According to the structure and stress characteristics of ultra-high ore column and taking into account the initial geometric deviation, a simplified mechanical model of compression bar is established. Based on the elastic-plastic theory, the deflection and internal force of ultra-high ore columns with initial geometric defects are analyzed. Based on the Kachanov damage theory, the damage process and instability time of ultra-high ore columns are studied. The results show that under the influence of initial deflection, additional deflection will appear in different degrees, and the size is related to the ratio of initial deflection and pressure (the ratio of overlying pressure to ultimate load of pillar), and increases with the increase of initial deflection and pressure ratio. The analysis of engineering examples shows that the damage incubation time and the unsteady lag time of the pillar are closely related to the initial deflection, pressure ratio and compressive strength. With the increase of the pressure ratio and the initial deflection, the damage incubation time and the unsteady lag time decrease rapidly. The greater the compressive strength, the greater the lag time of instability, that is, the more stable the pillar.
【作者單位】： 北京科技大學土木與資源工程學院金屬礦山高效開采與安全教育部重點實驗室;
【基金】：國家自然科學基金項目(51374033) 中國博士后科學基金項目(2016M591080)
【分類號】：TD853.391
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本文編號：1815666