本文選題：區(qū)段煤柱 + 光纖Bragg光柵�。� 參考：《地下空間與工程學(xué)報(bào)》2017年01期

【摘要】：為科學(xué)留設(shè)區(qū)段煤柱,基于光纖傳感監(jiān)測(cè)技術(shù),從煤柱內(nèi)部應(yīng)力應(yīng)變角度研究煤柱的合理尺寸及其穩(wěn)定性。制作平面物理相似材料模型,通過3個(gè)工作面開挖形成2個(gè)區(qū)段煤柱,在煤柱內(nèi)分別埋設(shè)5個(gè)光纖Bragg光柵傳感器及分布式傳感光纖,同時(shí),在模型底板鋪設(shè)60個(gè)壓力傳感器,監(jiān)測(cè)煤柱內(nèi)部應(yīng)力應(yīng)變變化。試驗(yàn)表明,煤柱內(nèi)部垂直應(yīng)變隨工作面推進(jìn)而增大,水平應(yīng)變隨工作面推進(jìn)呈"馬鞍形"分布;煤柱的破裂區(qū)寬度約為3~5 m,塑性區(qū)寬度約為5~8 m,彈性區(qū)寬度約為22~27 m;1~#區(qū)段煤柱和2~#區(qū)段煤柱一側(cè)開采時(shí),對(duì)應(yīng)的應(yīng)力集中系數(shù)分別為1.54和2.04;兩側(cè)均為采空區(qū)時(shí),應(yīng)力集中系數(shù)分別為1.99和2.18。光纖光柵監(jiān)測(cè)結(jié)果揭示了煤柱內(nèi)部應(yīng)力應(yīng)變規(guī)律,為煤柱穩(wěn)定性實(shí)時(shí)監(jiān)測(cè)提供了科學(xué)手段。
[Abstract]:Based on the optical fiber sensing monitoring technology, the reasonable size and stability of the pillar are studied from the angle of stress and strain in the pillar. A plane physical similar material model was made and two sections of coal pillars were formed by excavation of three working faces. Five fiber Bragg grating sensors and distributed sensing fibers were embedded in the pillar respectively. At the same time, 60 pressure sensors were laid on the bottom plate of the model. Monitor the change of stress and strain in coal pillar. The test results show that the vertical strain in the coal pillar increases with the advance of the working face, and the horizontal strain is "saddle" distribution with the advance of the working face. The width of fracture zone, plastic zone and elastic zone of coal pillar are about 3 ~ 5 m, 5 ~ 8 m and 22 ~ 27 m ~ (-1) ~ # pillar respectively, and the corresponding stress concentration factors are 1.54 and 2.04 respectively, when both sides are goaf, the width of elastic zone is about 22 ~ (27) m ~ (-1) ~ (-1) ~ # pillar and 2 ~ (#) section coal pillar, respectively, and the stress concentration factor is 1.54 and 2.04 respectively. The stress concentration factors are 1.99 and 2.18 respectively. The monitoring results of fiber Bragg grating reveal the stress and strain law of coal pillar and provide a scientific means for real time monitoring of coal pillar stability.
【作者單位】： 西安科技大學(xué)能源學(xué)院;教育部西部礦井開采與災(zāi)害防治重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金(51174280)
【分類號(hào)】：TD822.3

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