本文選題：煤巖組合體 + 卸載　； 參考：《煤炭學報》2017年12期

【摘要】：利用MTS 815試驗機對深部煤巖組合體進行分級循環(huán)加卸載試驗,研究了卸載過程中煤巖組合體軸向裂紋的張開效應,得出其軸向裂紋閉合應力(應變)和張開應力(應變)。研究結(jié)果表明:隨著循環(huán)次數(shù)的增加,加載和卸載過程中煤巖組合體的裂紋閉合應力(應變)和張開應力(應變)具有增大的趨勢;由于分級荷載的逐步增加,煤巖組合體產(chǎn)生新的裂紋,軸向裂紋閉合應變差、軸向裂紋張開應變差、軸向裂紋應力差隨循環(huán)次數(shù)增大而增大;推導出軸向裂紋張開模型,并利用試驗數(shù)據(jù)進行驗證,模型理論值與試驗值較為吻合,能有效描述卸載條件下軸向裂紋張開效應。
[Abstract]:The axial crack opening effect of deep coal rock assemblage was studied by using MTS 815 test machine. The axial crack closing stress (strain) and opening stress (strain) were obtained. The results show that the crack closing stress (strain) and opening stress (strain) of coal and rock assemblage tend to increase with the increase of cycle times during loading and unloading. New cracks appear in coal rock assemblage, axial crack closure strain difference, axial crack opening strain difference and axial crack stress difference increase with the increase of cycle times, axial crack opening model is derived and verified by test data. The theoretical values of the model are in good agreement with the experimental values, which can effectively describe the axial crack opening effect under unloading conditions.
【作者單位】： 中國礦業(yè)大學(北京)力學與建筑工程學院;河南理工大學河南省礦產(chǎn)資源綠色高效開采與綜合利用重點實驗室;中國礦業(yè)大學(北京)煤炭資源與安全開采國家重點實驗室;
【基金】：國家自然科學基金優(yōu)秀青年基金資助項目(51622404);國家自然科學基金資助項目(11572343) 河南省礦產(chǎn)資源綠色高效開采與綜合利用重點實驗室開放基金資助項目(S201601)
【分類號】：TD313
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本文編號：2013741