本文關(guān)鍵詞：不同應(yīng)力狀態(tài)下北山花崗巖巖爆傾向性研究　出處：《工程科學(xué)與技術(shù)》2017年06期 　論文類型：期刊論文

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【摘要】：為研究不同應(yīng)力狀態(tài)下北山花崗巖巖爆傾向性,對北山花崗巖試件進(jìn)行不同圍壓下的三軸試驗(yàn),通過軸向壓力和橫向變形協(xié)調(diào)控制加載,獲得不同圍壓下巖石全應(yīng)力應(yīng)變曲線,研究巖石破壞前能量聚集及破壞后能量釋放特征。結(jié)果表明:破壞時(shí)彈性能、總能量隨著圍壓增加而增大,且破壞后的總能量變化量及彈性能釋放量也隨著圍壓增加而增大。分析巖石儲能系數(shù)和能量釋放指數(shù)對巖石破壞的影響,發(fā)現(xiàn)巖石儲能系數(shù)和能量釋放指數(shù)隨圍壓增加而增大;綜合能量儲存系數(shù)和能量釋放指數(shù)建立新的巖爆傾向性評價(jià)指標(biāo),該指標(biāo)不僅表述了巖石破壞前后各能量的綜合變化特征,且能研究不同應(yīng)力狀態(tài)下巖石巖爆傾向性;使用該指標(biāo)研究不同應(yīng)力狀態(tài)對北山花崗巖的巖爆傾向性,結(jié)果表明:北山花崗巖具有較強(qiáng)的巖爆傾向性,且隨著圍壓增大,巖爆傾向性增加;當(dāng)圍壓低于10 MPa時(shí),圍壓對北山花崗巖巖爆傾向性影響較小,當(dāng)圍壓超過10 MPa時(shí),圍壓對巖爆傾向性的影響突然增加,但隨著圍壓進(jìn)一步增加,其對巖爆傾向性影響逐漸減弱。
[Abstract]:In order to study the rockburst tendency of Beishan granite under different stress states, the specimens were subjected to triaxial tests under different confining pressures, and the loading was controlled by coordinated axial pressure and lateral deformation. The total stress-strain curves of rock under different confining pressures are obtained and the characteristics of energy accumulation and energy release after failure are studied. The results show that the elastic energy and total energy increase with the increase of confining pressure. The total energy change and elastic energy release also increase with the increase of confining pressure. The influence of rock energy storage coefficient and energy release index on rock failure is analyzed. It is found that the energy storage coefficient and energy release index increase with the increase of confining pressure. A new evaluation index of rock burst tendency is established by synthesizing energy storage coefficient and energy release index, which not only describes the comprehensive variation characteristics of energy before and after rock failure. And the tendency of rock burst under different stress states can be studied. This index is used to study the rockburst tendency of Beishan granite under different stress states. The results show that the rockburst tendency of Beishan granite is strong and the tendency of rock burst increases with the increase of confining pressure. When the confining pressure is lower than 10 MPa, the confining pressure has little effect on the rockburst tendency of Beishan granite, and when the confining pressure exceeds 10 MPa, the influence of confining pressure on the rockburst tendency increases suddenly. However, with the further increase of confining pressure, its influence on rockburst tendency gradually weakened.
【作者單位】： 中國礦業(yè)大學(xué)(北京)力學(xué)與建筑工程學(xué)院;四川大學(xué)水利水電學(xué)院;
【基金】：國家國防科技工業(yè)局項(xiàng)目資助(高放廢物地質(zhì)處置地下實(shí)驗(yàn)室安全技術(shù)評價(jià)研究) 國家自然科學(xué)基金資助項(xiàng)目(51674266)
【分類號】：TU45
【正文快照】： 巖爆是深埋高地應(yīng)力工程中經(jīng)常遇到的工程災(zāi)害,一旦發(fā)生巖爆輕則影響工程順利進(jìn)展,重則造成人員傷亡。巖爆傾向性、預(yù)測預(yù)報(bào)及防治技術(shù)是研究巖爆必不可少的環(huán)節(jié),巖爆傾向性是根據(jù)巖石物理力學(xué)性質(zhì)確定工程巖體發(fā)生巖爆的可能性,而巖石基本性質(zhì)是巖爆能否發(fā)生的內(nèi)因,因此巖爆

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