【摘要】：在高地應(yīng)力巖體中進(jìn)行隧道施工時(shí),常發(fā)生圍巖開裂、彈射、崩塌、變形過大等工程災(zāi)害,將對施工及后期運(yùn)行的安全產(chǎn)生較大危害。通過研究高地應(yīng)力條件下隧道圍巖應(yīng)力應(yīng)變狀態(tài)和圍巖松動圈分布規(guī)律,可合理優(yōu)化隧道設(shè)計(jì)與施工參數(shù),有效保障該類工程高效安全的施工。本文在系統(tǒng)介紹常用高地應(yīng)力判釋標(biāo)準(zhǔn)和方法的基礎(chǔ)上,提出了基于Hoek-Brown強(qiáng)度準(zhǔn)則的高地應(yīng)力狀態(tài)理論判定公式。通過引入中間主應(yīng)力,得到了適用于高地應(yīng)力條件的修正的Hoek-Brown巖體強(qiáng)度準(zhǔn)則,并根據(jù)彈塑性理論推導(dǎo)出硐室圍巖塑性區(qū)應(yīng)力、塑性區(qū)半徑和松動圈半徑的解析解。在寶漢高速某深埋隧道中運(yùn)用所提出的高地應(yīng)力判別標(biāo)準(zhǔn)得出該隧道位于高地應(yīng)力區(qū)。選取典型斷面ZK163+868和YK163+775,根據(jù)修正的Hoek-Brown強(qiáng)度準(zhǔn)則進(jìn)行彈塑性理論計(jì)算,并結(jié)合MIDAS/GTS有限元數(shù)值模擬和聲波法現(xiàn)場實(shí)測,分析隧道圍巖應(yīng)力狀態(tài)、塑性區(qū)和松動圈分布范圍。結(jié)果顯示三種方法所得松動圈范圍較為接近,且分布規(guī)律基本一致,證明基于修正的Hoek-Brown強(qiáng)度準(zhǔn)則可較為準(zhǔn)確的計(jì)算出圍巖松動圈半徑。同時(shí)得出在高地應(yīng)力場中隧道圍巖松動圈半徑隨中間主應(yīng)力的增大呈先減后增的趨勢,隨支護(hù)力的增大呈減小趨勢,且分布并不均勻,由于構(gòu)造應(yīng)力的影響水平方向松動圈半徑大于豎直方向。
[Abstract]:When tunnel construction is carried out in high ground stress rock mass, engineering disasters such as cracking of surrounding rock, ejection, collapse and excessive deformation often occur, which will cause great harm to the safety of construction and later operation. By studying the stress and strain state of surrounding rock and the distribution law of surrounding rock loose circle under the condition of high ground stress, the design and construction parameters of tunnel can be reasonably optimized, and the efficient and safe construction of this kind of project can be effectively guaranteed. Based on the systematic introduction of the commonly used criteria and methods for judging and releasing high in-situ stress, this paper presents a formula for determining the state of high in-situ stress based on Hoek-Brown strength criterion. By introducing the intermediate principal stress, a modified Hoek-Brown rock mass strength criterion suitable for high in-situ stress condition is obtained, and the analytical solutions of stress, plastic zone radius and loosening circle radius of surrounding rock around the chamber are derived according to the elastoplastic theory. In a deep buried tunnel of Bao-Han Expressway, it is concluded that the tunnel is located in the area of high ground stress by using the criterion of high ground stress. The typical section ZK163 868 and YK163 775 are selected to calculate the elastic-plastic theory according to the modified Hoek-Brown strength criterion. The stress state, plastic zone and loose zone distribution range of tunnel surrounding rock are analyzed by combining MIDAS/GTS finite element numerical simulation and field measurement with acoustic method. The results show that the range of loosening circle obtained by the three methods is close and the distribution law is basically the same. It is proved that the radius of the loosening ring of surrounding rock can be calculated more accurately based on the modified Hoek-Brown strength criterion. At the same time, it is concluded that the radius of loosening circle of tunnel surrounding rock decreases first and then increases with the increase of intermediate principal stress, and decreases with the increase of supporting force in high ground stress field, and the distribution is not uniform. Because of the influence of tectonic stress, the radius of loosening circle in horizontal direction is larger than that in vertical direction.
【學(xué)位授予單位】：西安工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U451.2

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