本文選題：隧洞圍巖 + 穩(wěn)定性��； 參考：《中國安全科學學報》2016年02期

【摘要】：為研究隧洞圍巖的穩(wěn)定性,在考慮滲流、剪脹和中間主應力的基礎(chǔ)上,依據(jù)彈塑性理論和非關(guān)聯(lián)流動法則推導出隧洞圍巖應力場和位移場的解析式,分析襯砌反力和洞壁位移的關(guān)系,并得到圍巖-襯砌特征曲線。結(jié)果表明:滲流和中間主應力對隧洞圍巖應力場和位移場均有較大的影響,考慮滲流相對于不考慮滲流時,切向應力峰值更大,塑性區(qū)半徑更小;隨著中間主應力的增大,塑性區(qū)半徑變小,塑性區(qū)位移增大;剪脹僅影響圍巖位移場,對應力場無影響,剪脹角越大,塑性區(qū)位移越大;圍巖和襯砌存在相互協(xié)調(diào)作用的關(guān)系,中間主應力越大,最佳襯砌力越小。
[Abstract]:In order to study the stability of surrounding rock of tunnel, on the basis of considering seepage, shear expansion and intermediate principal stress, the analytical expressions of stress field and displacement field of surrounding rock of tunnel are derived according to elastic-plastic theory and non-correlation flow rule. The relationship between lining reaction force and wall displacement is analyzed, and the characteristic curve of surrounding rock lining is obtained. The results show that seepage and intermediate principal stress have great influence on stress field and displacement field of surrounding rock of tunnel. Considering seepage flow, the peak value of tangential stress is larger and the radius of plastic zone is smaller than that without seepage, and with the increase of intermediate principal stress, The radius of the plastic zone becomes smaller, the displacement of the plastic zone increases, the shear expansion only affects the displacement field of surrounding rock, but the force field has no effect, the larger the angle of expansion, the larger the displacement of plastic zone, the more the main stress between the surrounding rock and the lining is, The best lining force is smaller.
【作者單位】： 安徽理工大學深部煤礦采動響應與災害防控安徽省重點實驗室;
【基金】：國家自然科學基金資助(51304007)
【分類號】：U451.2

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