本文選題：自穩(wěn)時(shí)間 + 巖體分級(jí)��； 參考：《工程科學(xué)與技術(shù)》2017年03期

【摘要】：現(xiàn)行隧道自穩(wěn)時(shí)間解析法中未考慮地下水的軟化作用,導(dǎo)致過高估計(jì)親水軟化性巖石的圍巖質(zhì)量。以具有典型軟化特性的石膏巖為研究對(duì)象,探索水的軟化作用對(duì)隧道圍巖自穩(wěn)時(shí)間的影響。采用試驗(yàn)和理論相結(jié)合的方法研究圍巖自穩(wěn)時(shí)間。首先,進(jìn)行不同浸水時(shí)間下的石膏巖軟化試驗(yàn),研究其軟化規(guī)律;通過試驗(yàn)獲得石膏巖吸水率、彈性模量和泊松比分別與浸水時(shí)間之間的定量關(guān)系;在彈性模量與浸水時(shí)間及泊松比與浸水時(shí)間的定量關(guān)系中,引入完整性系數(shù)和富水系數(shù),建立巖體力學(xué)參數(shù)軟化方程。然后,基于經(jīng)典的圓形軸對(duì)稱隧道彈性解,考慮掌子面對(duì)隧道軸向位移的影響,推導(dǎo)出隧道臨空面處無支護(hù)狀態(tài)下的位移公式;把巖體力學(xué)參數(shù)軟化方程嵌入此位移公式中,獲得考慮軟化效應(yīng)的臨空面位移解。最后,在此位移解中引入活躍跨度和圍巖的臨界位移值,建立考慮軟化效應(yīng)的隧道圍巖自穩(wěn)時(shí)間解析模型。該模型考慮了圍巖體工程特性、巖石力學(xué)特性及巖石軟化特性,能輸出自穩(wěn)時(shí)間與活躍跨度之間的關(guān)系曲線。經(jīng)自洽分析法檢驗(yàn),該模型中自穩(wěn)時(shí)間隨各參數(shù)的變化規(guī)律與實(shí)際情況相符,模型具有自洽性。模型被應(yīng)用于評(píng)價(jià)禮讓隧道石膏圍巖的自穩(wěn)時(shí)間,現(xiàn)場(chǎng)反饋結(jié)果表明該模型更適合于現(xiàn)場(chǎng)應(yīng)用。
[Abstract]:In the present analytical method of tunnel self-stability time, the softening of groundwater is not considered, which leads to overestimation of surrounding rock mass of hydrophilic softening rock. Taking gypsum rock with typical softening characteristics as the research object, the influence of water softening on the time of self-stabilization of tunnel surrounding rock is explored. The time of self-stability of surrounding rock is studied by combining test and theory. Firstly, the softening test of gypsum rock under different soaking time was carried out, and the quantitative relationship between water absorption, elastic modulus and Poisson's ratio of gypsum rock and soaking time was obtained. In the quantitative relationship between elastic modulus and soaking time and Poisson's ratio with soaking time, the integral coefficient and water-rich coefficient are introduced, and the softening equation of mechanical parameters of rock mass is established. Then, based on the classical elastic solution of circular axisymmetric tunnel, considering the influence of the face on the axial displacement of the tunnel, the displacement formula is derived under the condition of no support on the face of the tunnel, and the softening equation of the mechanical parameters of rock mass is embedded in the displacement formula. The solution of face displacement considering softening effect is obtained. Finally, the critical displacement values of active span and surrounding rock are introduced into the displacement solution, and an analytical model of tunnel surrounding rock self-stability time considering softening effect is established. The model takes into account the engineering characteristics of surrounding rock, the mechanical properties of rock and the softening of rock, and can output the curve between the self-stability time and the active span. The results of self-consistent analysis show that the variation of self-stability time with each parameter is consistent with the actual situation, and the model has self-consistency. The model is applied to evaluate the self-stability time of gypsum surrounding rock in Licheng tunnel. The field feedback results show that the model is more suitable for field application.
【作者單位】： 重慶大學(xué)煤礦災(zāi)害動(dòng)力學(xué)與控制國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51074198) 重慶市研究生科研創(chuàng)新項(xiàng)目資助(CYB15011)
【分類號(hào)】：U451.2

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