本文關(guān)鍵詞： 循環(huán)擾動 高應(yīng)力 應(yīng)力幅值 損傷模型　出處：《煤炭學報》2017年09期 　論文類型：期刊論文

【摘要】：設(shè)計3種不同類型的巖石在不同應(yīng)力幅值下的循環(huán)擾動試驗。試驗結(jié)果表明:當擾動應(yīng)力幅值較小時,巖石在循環(huán)加載下出現(xiàn)彈性模量強化效應(yīng),不同類型的巖石彈性模量強化程度不同;循環(huán)動力擾動加載試驗存在應(yīng)力上限門檻值,只有大于應(yīng)力上限門檻值,試樣才會發(fā)生破壞;擾動應(yīng)力幅值對巖石的破壞影響顯著,在高應(yīng)力幅值下,循環(huán)次數(shù)迅速減少;在低應(yīng)力幅值下,試件破壞形態(tài)為剪切破壞,在高應(yīng)力幅值下,破壞形態(tài)復雜,出現(xiàn)板裂化破壞和碎塊彈射。建立了循環(huán)擾動作用下的應(yīng)變損傷模型,通過分析不同應(yīng)力幅值下?lián)p傷變量的變化規(guī)律,得出如下結(jié)論:巖石損傷可劃分為迅速增長階段、平穩(wěn)發(fā)展階段、快速增大階段,且隨著擾動應(yīng)力幅值的增加,平穩(wěn)發(fā)展階段的循環(huán)數(shù)顯著減少;當應(yīng)力幅值提高,損傷變量變化率顯著提高,應(yīng)變迅速增加,巖石破壞。
[Abstract]:The cyclic disturbance tests of three different types of rock under different stress amplitudes are designed. The experimental results show that when the amplitude of disturbance stress is small, the elastic modulus strengthening effect appears under cyclic loading. Different types of rock have different strengthening degree of elastic modulus, the stress upper limit threshold exists in cyclic dynamic disturbance loading test, only when the stress threshold value is larger than the upper limit value, the specimen will be destroyed, and the disturbance stress amplitude has a significant effect on rock failure. Under the high stress amplitude, the number of cycles decreases rapidly, the failure mode of the specimen is shear failure at low stress amplitude, and the failure form is complex under the high stress amplitude. The strain damage model under cyclic disturbance is established. By analyzing the variation of damage variables under different stress amplitudes, it is concluded that rock damage can be divided into rapid growth stages. The cycle number of the steady development stage decreases significantly with the increase of the amplitude of disturbance stress, and the rate of change of damage variable increases significantly, the strain increases rapidly, and the rock failure occurs when the stress amplitude increases.
【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;北京市信息服務(wù)工程重點實驗室;中南大學高等研究中心;
【基金】：中國礦業(yè)大學深部巖土力學與地下工程國家重點實驗室開放基金資助項目(SKLGDUEK1418) 湖南省自然科學基金資助項目(2017JJ3390)
【分類號】：TD315
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本文編號：1506433