【摘要】：為得到不同類型煤體在壓縮破壞過程中應力和電荷的變化規(guī)律,利用自主研制的電荷感應測試系統(tǒng)進行室內(nèi)試驗。試驗分別對沖擊型原煤試樣、突出型原煤試樣及型煤試樣壓縮破壞過程進行實時電荷監(jiān)測。結(jié)果表明,不同類型的煤樣在壓縮過程中產(chǎn)生的應力變化曲線有明顯的區(qū)別,沖擊型煤樣在加載過程中的應力-應變曲線在達到峰值應力前表現(xiàn)為較好的線性關系,峰后區(qū)的應力-應變曲線一般主要表現(xiàn)為近似豎直的直線。突出型煤樣在加載過程中峰前區(qū)的應力曲線出現(xiàn)了多個峰值,在峰后區(qū)應力-應變曲線一般表現(xiàn)為上凹形的曲線。型煤試樣的應力曲線峰前區(qū)有更為明顯的壓密階段、線彈性階段及彈塑性階段,峰后區(qū)的應力-應變曲線一般表現(xiàn)為上凸的曲線。3種不同類型煤體壓縮破裂時電荷感應信號峰值出現(xiàn)的位置及電荷感應信號的集中或分散程度也不同。沖擊型煤樣的電荷感應信號出現(xiàn)的位置相對比較集中,主要出現(xiàn)在峰值應力前后和試樣完全失穩(wěn)破壞階段。突出型煤試樣的電荷感應信號則比較分散,一般出現(xiàn)在應力出現(xiàn)峰值前后或應力急劇增加階段。型煤試樣的電荷感應信號一般出現(xiàn)在應力軟化階段,在峰值應力前階段并沒有收集到電荷感應信號。利用不同類型煤體在壓縮破壞時的電荷感應信號不同,可以為礦山災害的發(fā)生提供預報信息。
[Abstract]:In order to obtain the variation of the stress and charge of different types of coal in the process of compression and failure, the indoor test was carried out by the independent developed charge induction test system. The real time charge monitoring was carried out on the compression failure process of the impacted raw coal samples, the outstanding raw coal samples and the briquette samples. The results showed that different types of coal samples were in the test. The stress variation curve produced in the compression process is distinctly different. The stress strain curve of the briquette sample in the loading process shows a good linear relationship before the peak stress is reached, and the stress strain curve in the post peak area is generally mainly shown as a straight straight line. The stress strain curve in the post peak area usually shows a concave curve in the post peak area. The stress curve in the pre peak area of the briquette sample has more obvious compaction stage, linear elastic stage and elastoplastic stage, and the stress strain curve in the post peak area generally displays the charge sense when the.3 different types of coal are compressed and ruptured. The position of the peak value of the signal peak and the concentration or dispersion of the charge induction signal are different. The position of the charge induction signal of the briquette sample is relatively concentrated, which mainly occurs before and after the peak stress and the complete failure stage of the specimen. The charge stress signal of the sample of the outburst type coal is more dispersed and generally appears in the stress. The charge induction signal in the briquette specimen appears in the stage of stress softening, and the charge induction signal is not collected before the peak stress stage. The charge induction signal of different types of coal in the compression failure can provide the prediction information for the occurrence of mine disasters.
【作者單位】： 遼寧工程技術大學力學與工程學院;遼寧工程技術大學電氣與控制工程學院;
【分類號】：TD315

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