發(fā)布時(shí)間：2019-01-12 07:44

【摘要】：隨著中國(guó)煤炭開采深度逐漸加深,煤巖組合體的力學(xué)特性與應(yīng)力 應(yīng)變關(guān)系顯得越來越重要。煤巖組合體的原生裂紋和煤巖體之間的界面對(duì)其力學(xué)性質(zhì)有較大影響。為了探知裂紋和界面的影響,主要研究了軸向裂紋應(yīng)變隨應(yīng)力、應(yīng)變的演化特征,并基于工程應(yīng)變和自然(真實(shí))應(yīng)變的概念,建立軸向裂紋閉合模型(axial crack closure model,簡(jiǎn)稱ACCM)及軸向裂紋擴(kuò)展模型(axial crack propagation model,簡(jiǎn)稱ACPM),最后建立了峰前應(yīng)力 應(yīng)變關(guān)系模型。分析發(fā)現(xiàn),軸向裂紋應(yīng)變與軸向應(yīng)變關(guān)系可分為4個(gè)階段,即初始階段、穩(wěn)定階段、緩慢增長(zhǎng)階段和快速增長(zhǎng)階段,軸向裂紋應(yīng)變與軸向應(yīng)力關(guān)系與之類似。軸向裂紋閉合模型、軸向裂紋擴(kuò)展模型與峰前應(yīng)力 應(yīng)變模型均能夠較好地與試驗(yàn)數(shù)據(jù)吻合,能夠描述應(yīng)力 應(yīng)變關(guān)系的非線性特點(diǎn)。
[Abstract]:With the deepening of coal mining depth in China, the relationship between mechanical properties and stress and strain of coal-rock assemblages is becoming more and more important. The primary crack and the interface between coal and rock mass have great influence on the mechanical properties of coal and rock assemblage. In order to understand the influence of crack and interface, the evolution characteristics of axial crack strain with stress and strain are studied. Based on the concepts of engineering strain and natural (real) strain, the axial crack closure model (axial crack closure model, is established. The axial crack growth model (axial crack propagation model,) and the axial crack growth model (ACPM),) are used to establish the stress-strain relationship model before the peak. It is found that the relationship between axial crack strain and axial strain can be divided into four stages: initial stage, stable stage, slow growth stage and rapid growth stage. The relationship between axial crack strain and axial stress is similar. The axial crack closure model, the axial crack growth model and the pre-peak stress and strain model are in good agreement with the experimental data, and can describe the nonlinear characteristics of the stress-strain relationship.
【作者單位】： 中國(guó)礦業(yè)大學(xué)(北京)力學(xué)與建筑工程學(xué)院;河南理工大學(xué)河南省礦產(chǎn)資源綠色高效開采與綜合利用重點(diǎn)實(shí)驗(yàn)室;中國(guó)礦業(yè)大學(xué)(北京)煤炭資源與安全開采國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金優(yōu)秀青年基金項(xiàng)目(51622404);國(guó)家自然科學(xué)基金項(xiàng)目(51374215,11572343) “萬人計(jì)劃”青年拔尖人才 河南省礦產(chǎn)資源綠色高效開采與綜合利用重點(diǎn)實(shí)驗(yàn)室開放基金項(xiàng)目(S201601)聯(lián)合資助項(xiàng)目
【分類號(hào)】：TD313
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本文編號(hào)：2407520