發(fā)布時(shí)間：2018-01-02 21:25

  本文關(guān)鍵詞：煤體剪切破壞電荷感應(yīng)規(guī)律試驗(yàn)研究　出處：《安全與環(huán)境學(xué)報(bào)》2016年03期 　論文類型：期刊論文

  更多相關(guān)文章： 安全工程 煤體剪切破壞 電荷感應(yīng) 摩擦作用 變形破壞

【摘要】：為研究煤體剪切破壞過程中的電荷感應(yīng)規(guī)律,基于變角板法對(duì)某礦區(qū)煤體在不同剪切角度破壞下進(jìn)行電荷監(jiān)測(cè),探究了煤體在剪切破壞過程中的力-電感應(yīng)變化規(guī)律。結(jié)果表明:隨剪切角增大,煤體發(fā)生剪切破壞的強(qiáng)度逐漸減弱,失穩(wěn)破壞形式由壓剪破壞向張拉破壞過渡;煤體剪切破壞過程中有顯著電荷感應(yīng)信號(hào)產(chǎn)生,電荷信號(hào)異常區(qū)域?qū)?yīng)于剪應(yīng)力突變階段;隨剪切角增大,煤體應(yīng)力峰值前電荷信號(hào)逐漸減少并不斷向剪應(yīng)力峰值附近集中,剪應(yīng)力峰值前累計(jì)的電荷量也逐漸減少;提出了煤體剪切破壞過程中產(chǎn)生電荷的機(jī)理主要為摩擦作用的觀點(diǎn);電荷感應(yīng)信號(hào)峰值在剪應(yīng)力達(dá)到極限強(qiáng)度之前出現(xiàn),電荷信號(hào)峰值比剪應(yīng)力峰值提前出現(xiàn)時(shí)間隨剪切角度增加有減短趨勢(shì);在首次出現(xiàn)電荷峰值信號(hào)之后短時(shí)間內(nèi)煤體將發(fā)生較大幅度的應(yīng)力跌落過程;可以以電荷信號(hào)峰值的出現(xiàn)為基點(diǎn)來預(yù)測(cè)煤體將要發(fā)生變形破壞及通過電荷信號(hào)的整體分布特征來揭示煤體剪切破壞規(guī)律。
[Abstract]:As the charge induction rules in the process of destruction of the coal body shear, variable angle plate method in a mining area of coal charge monitoring at different shear angle of failure based on the exploration of coal in the shear process of stress variation of electric induction. The results showed that with the shear angle, shear failure of coal body the intensity gradually weakened, the failure form of shear to tensile failure transition; significant charge induction signal generated in the shear failure process of coal body, the corresponding charge signal abnormal area by the shearing stress mutation stage; with the shear angle increases, the peak stress of coal before the charge signal and to continue to gradually reduce the shear stress concentration near the peak stress, the peak shear stress before the amount of charge accumulated gradually reduced; mechanism of charge generation is put forward in the process of coal shear failure is mainly friction point; the charge induction signal peak in shear stress reached the pole Limit strength before the peak charge signal than the peak value of the shear stress shear angle increases with time in advance have reduced trend; after peak charge signal within a short time of coal will occur larger stress drop for the first time; to peak charge signal as the starting point to predict coal will happen to reveal the overall distribution of coal shearing by the charge signal failure pattern and deformation.

【作者單位】： 遼寧工程技術(shù)大學(xué)力學(xué)與工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金面上項(xiàng)目(11172121)
【分類號(hào)】：TD315
【正文快照】： 0引言隨著我國(guó)淺部煤炭資源的逐年減少,煤礦開采逐漸轉(zhuǎn)向深部,使得沖擊地壓、瓦斯突出和突水等日趨嚴(yán)重的礦山動(dòng)力災(zāi)害變得勢(shì)不可擋。煤礦開采的動(dòng)災(zāi)監(jiān)測(cè)方法和手段的研究已成為保障煤炭資源安全高效開采的重要科學(xué)問題�，F(xiàn)有研究成果[1-4]表明,煤體變形破裂過程產(chǎn)生的電荷信

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