本文選題：引大濟(jì)湟 + 隧道掘進(jìn)機(jī)(TBM)��； 參考：《巖土力學(xué)》2017年10期

【摘要】：針對青海省引大通河濟(jì)湟水河(引大濟(jì)湟)工程頻繁遭遇擠壓大變形和卡機(jī)災(zāi)害難題,基于擠壓大變形本構(gòu)模型和全斷面隧道掘進(jìn)機(jī)(TBM)卡機(jī)事故預(yù)測分析理論,提出了擠壓大變形和卡機(jī)計(jì)算方法,進(jìn)行了引大濟(jì)湟工程TBM掘進(jìn)圍巖擠壓大變形與卡機(jī)計(jì)算,結(jié)果表明:(1)TBM穿越F5斷層區(qū)段時(shí),當(dāng)擴(kuò)挖間隙為10 cm時(shí),開挖卸荷后護(hù)盾所受摩阻力將達(dá)到推進(jìn)系統(tǒng)提供的最大推力,易發(fā)生卡機(jī)事故;(2)擠壓變形、圍巖-護(hù)盾接觸面積和護(hù)盾所受摩阻力隨停機(jī)時(shí)間不斷增大,停機(jī)1 d內(nèi)增大的速率越來越大,停機(jī)后7 d起,圍巖流變速率和護(hù)盾所受摩阻力增加速率均減緩,直到停機(jī)后13 d時(shí),圍巖-護(hù)盾相互作用達(dá)到平衡,護(hù)盾所受摩阻力趨于穩(wěn)定。同時(shí)為了防止和控制卡機(jī)事故,對該工程后續(xù)施工提出了最佳擴(kuò)挖間隙和許可停機(jī)時(shí)間等卡機(jī)綜合防控的3個(gè)對策:即擴(kuò)挖間隙至少要增大到15 cm,此時(shí)停機(jī)初始時(shí)刻不發(fā)生卡機(jī),許可停機(jī)時(shí)間為2 d;擴(kuò)挖間隙增大到18 cm時(shí),許可停機(jī)時(shí)間為4 d;擴(kuò)挖間隙增大到20 cm時(shí),就選取的圍巖條件下,停機(jī)7 d內(nèi)TBM基本不發(fā)生卡機(jī),7 d后也很容易克服卡機(jī)。提出的卡機(jī)防控措施對引大濟(jì)湟工程TBM安全高效掘進(jìn)具有一定的指導(dǎo)意義,并得到工程實(shí)際控制對策的驗(yàn)證。
[Abstract]:In view of the difficult problems of large extrusion deformation and jam disaster frequently encountered in the project of diversion of Datong River to Huangshui River (Yida Jichuang) in Qinghai Province, based on the constitutive model of large deformation of extrusion and the theory of prediction and analysis of the accident of TBM-based full-section tunnel tunneling machine, The calculation method of extrusion large deformation and clamping machine is put forward, and the calculation of large deformation and clamping machine of surrounding rock in TBM excavation of Dazihuang Project is carried out. The results show that when the cross section of F5 fault is crossed by TBM, the gap of expansion and excavation is 10 cm. After excavating and unloading, the friction resistance of shield will reach the maximum thrust provided by propulsion system, which is prone to press deformation, and the contact area between surrounding rock and shield and the frictional resistance of shield will increase with the stop time. The increasing rate of wall rock rheology and the friction resistance of shield decreased from 7 days after the shutdown, until 13 days after the shutdown, the interaction between surrounding rock and shield reached equilibrium. Resistance to friction against shields tends to stabilize. At the same time, in order to prevent and control card accidents, For the subsequent construction of the project, three countermeasures are put forward for comprehensive prevention and control of the clamping machine, such as the optimal expanding gap and the permitted downtime: the gap of expanding and digging should be increased to at least 15 cm, and at this time, the clamping machine will not occur at the initial time of shutdown. The allowable stop time is 2 days, when the gap increases to 18 cm, the allowable stop time is 4 days, and when the gap increases to 20 cm, under the selected surrounding rock condition, after 7 days of downtime, it is easy to overcome the clamping machine when the TBM does not occur in 7 days. The prevention and control measures put forward by the paper have certain guiding significance for the safe and efficient excavation of TBM in Data-Jihuang Project, and have been verified by the practical control countermeasures of the project.
【作者單位】： 中國科學(xué)院武漢巖土力學(xué)研究所巖土力學(xué)與工程國家重點(diǎn)實(shí)驗(yàn)室;武漢大學(xué)土木建筑工程學(xué)院巖土與結(jié)構(gòu)工程安全湖北省重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(No.41602326) 國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973)資助項(xiàng)目(No.2014CB046904,No.2015CB058102)~~
【分類號】：TV554;TV68

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