本文選題：深埋隧洞 + 全長錨固　； 參考：《鐵道工程學(xué)報(bào)》2017年03期

【摘要】：研究目的:榴桐寨隧道是新建成都至蘭州鐵路線的關(guān)鍵性控制工程,其圍巖大變形問題十分突出,而目前對深埋隧洞圍巖流變條件下的變形預(yù)測尚無成熟的計(jì)算方法。本文在總結(jié)現(xiàn)有圍巖變形研究成果的基礎(chǔ)上,將隧洞圍巖簡化為理想彈塑性介質(zhì)并布設(shè)全長錨固錨桿,基于錨桿-圍巖協(xié)調(diào)變形原理,分析桿體表面摩阻力及其軸力的分布規(guī)律,由靜力平衡條件推導(dǎo)錨桿中性點(diǎn)處的最大軸力值,進(jìn)而建立變形穩(wěn)定后圍巖的塑性區(qū)及松動(dòng)區(qū)半徑公式,從理論上確定榴桐寨隧道圍巖的松動(dòng)區(qū)及塑性區(qū)范圍,為優(yōu)化圍巖支護(hù)方案及參數(shù)提供重要的技術(shù)支撐。研究結(jié)論:(1)工程實(shí)際中,圍巖流變是導(dǎo)致深埋隧洞出現(xiàn)大變形的根本原因,隧洞圍巖變形通常在初期錨桿支護(hù)一段時(shí)間后才趨于穩(wěn)定;(2)隧洞圍巖與錨桿協(xié)調(diào)變形,桿體所受正、負(fù)摩阻力的分界面即為桿體中性點(diǎn),該點(diǎn)桿體與其周圍巖體的相對位移及表面摩阻力為零,但其所受軸向拉力達(dá)到最大值;(3)通過錨桿所受最大軸力可對變形穩(wěn)定后的隧洞圍巖塑性區(qū)及松動(dòng)區(qū)范圍進(jìn)行反演分析,圍巖塑性區(qū)及松動(dòng)區(qū)范圍的大小隨巖體黏聚力和內(nèi)摩擦角的增加而減小,隨隧洞半徑的增加而增大,但受支護(hù)阻力的影響不大;(4)現(xiàn)場應(yīng)用結(jié)果表明,基于錨桿軸力反分析隧洞圍巖分區(qū)規(guī)律的方法是合理可行的,該研究成果對于類似隧洞工程的安全快速施工具有一定的借鑒意義。
[Abstract]:Research purpose: the Yutongzhai Tunnel is a key control project for the newly built Chengdu to Lanzhou railway line, and the problem of large deformation of surrounding rock is very prominent. However, there is no mature calculation method to predict the deformation of the surrounding rock under the condition of rheology of the deep buried tunnel at present. On the basis of summarizing the existing research results of surrounding rock deformation, the tunnel surrounding rock is simplified as an ideal elastic-plastic medium and a full-length anchoring anchor rod is arranged, which is based on the principle of coordinated deformation between anchor and surrounding rock. Based on the analysis of the surface friction and its axial force distribution, the maximum axial force at the neutral point of the anchor rod is derived from the static equilibrium condition, and then the formulas of the plastic zone and the loose zone radius of the surrounding rock after deformation and stabilization are established. The range of loose zone and plastic zone of surrounding rock of Yutongzhai tunnel is determined theoretically, which provides important technical support for optimizing the supporting scheme and parameters of surrounding rock. The conclusions are as follows: (1) in engineering practice, the rheology of surrounding rock is the fundamental cause of large deformation of deep buried tunnel, and the deformation of surrounding rock of tunnel tends to be stable only after a period of initial bolting support; (2) the deformation of tunnel surrounding rock and bolt is coordinated, and the deformation of rock mass is positive. The interface of negative friction is the neutral point of the bar body, and the relative displacement and surface friction between the rod body and the surrounding rock mass are zero. (3) the plastic zone and loose zone of the tunnel can be inversely analyzed by the maximum axial force of anchor rod. The range of plastic zone and loose zone of surrounding rock decreases with the increase of cohesive force and angle of internal friction of rock mass, increases with the increase of tunnel radius, but is not affected by the support resistance. (4) the field application results show that, It is reasonable and feasible to reverse analyze the zoning rule of surrounding rock of tunnel based on the axial force of anchor rod, and the research result has certain reference significance for the safety and fast construction of similar tunnel engineering.
【作者單位】： 西安科技大學(xué);中鐵十二局集團(tuán)第二工程處;
【基金】：陜西省自然科學(xué)基礎(chǔ)研究計(jì)劃項(xiàng)目(2014JM2-5052) 中國博士后科學(xué)基金資助項(xiàng)目(2015M582761XB) 國家自然科學(xué)基金資助項(xiàng)目(51474173)
【分類號】：U451.2

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