本文關(guān)鍵詞： 隧道錨 原位模型試驗(yàn) 軟巖蠕變 長期穩(wěn)定性 數(shù)值模擬　出處：《長江科學(xué)院》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：擬建的幾江長江大橋北岸擬采用隧道式錨碇,基巖為侏羅系上統(tǒng)遂寧組泥巖,局部夾砂巖,中等風(fēng)化程度,屬于典型的淺埋、軟巖隧道錨,標(biāo)準(zhǔn)組合下單根主纜拉力1.08×105kN。同時(shí)北岸部分隧道錨體及圍巖處于庫水位下,下游小南海水電站建成運(yùn)營后將進(jìn)一步抬升庫水位,而泥巖有遇水軟化和受荷蠕變的特性,地下水及其水位將對隧道錨長期穩(wěn)定性產(chǎn)生影響。國內(nèi)外極少見到在淺埋、軟巖、富水環(huán)境中修建高拉拔荷載的隧道式錨碇。因此深入研究復(fù)雜環(huán)境下錨碇長期穩(wěn)定性,評價(jià)其可行性,進(jìn)一步拓展隧道錨適用范圍,對我國公路交通建設(shè)具有十分重要的意義。本文以幾江長江大橋北岸隧道式錨碇方案為研究背景,率先設(shè)計(jì)并實(shí)施泡水和天然狀態(tài)下的隧道錨縮尺模型恒載張拉對比試驗(yàn),揭示錨碇-圍巖系統(tǒng)時(shí)效變形特性及地下水的影響作用;同時(shí)依據(jù)室內(nèi)外巖石力學(xué)試驗(yàn)、模型試驗(yàn)測試結(jié)果,利用PSO-LSSVM反演分析方法辨識得到天然和富水泥巖在拉拔荷載下蠕變模型、蠕變參數(shù);在此基礎(chǔ)上開展了實(shí)橋錨碇-圍巖系統(tǒng)的三維數(shù)值分析,研究了錨碇長期穩(wěn)定性以及庫水小幅抬升影響作用,結(jié)果表明,庫水小幅抬升后,泥巖受到水的影響而弱化,錨碇-圍巖系統(tǒng)的蠕變位移比庫水抬升前有所增大,但幅度不大,錨碇體周邊圍巖基本處于彈性工作狀態(tài),僅錨碇前、后端面附近出現(xiàn)小范圍的塑性區(qū)。
[Abstract]:In the north bank of the proposed Yangtze River Bridge, tunnel Anchorage is to be adopted. The bedrock is mudstone of Suining formation of Jurassic Upper Series, partial intercalation of sandstone, medium weathering degree, belonging to typical shallow buried, soft rock tunnel anchor. The standard combination issued an order root cable tension of 1.08 脳 105 kN. at the same time, some tunnel anchors and surrounding rocks in the north shore are under the reservoir water level, the downstream Xiaonanhai Hydropower Station will further raise the reservoir water level after completion and operation, while the mudstone has the characteristics of water softening and loading creep. Underground water and its water level will affect the long-term stability of tunnel anchors. It is seldom seen at home and abroad to build tunnel anchorages with high pull-out loads in shallow buried, soft rock and water-rich environments. Therefore, the long-term stability of anchorages in complex environments is deeply studied. It is of great significance to evaluate its feasibility and further expand the applicable range of tunnel anchors for highway traffic construction in China. This paper takes the tunnel Anchorage scheme on the north bank of Jijiang and Yangtze River Bridge as the research background. In order to reveal the aging deformation characteristics of Anchorage surrounding rock system and the influence of groundwater, the comparative test of tunnel anchor scale model under the condition of bubble water and natural state is first designed and carried out in order to reveal the influence of underground water on the aging deformation of Anchorage surrounding rock system, and according to the indoor and outdoor rock mechanics tests, The creep model and creep parameters of natural and cement-rich rock under pull-out load were identified by using PSO-LSSVM inversion analysis method, and the three-dimensional numerical analysis of solid bridge anchorage-surrounding rock system was carried out. The long-term stability of Anchorage and the effect of small uplift of reservoir water are studied. The results show that the mudstone is weakened by water after small uplift, and the creep displacement of Anchorage surrounding rock system is larger than that before water uplift, but the range is not large. The surrounding rock around the Anchorage is basically in an elastic state, and a small area of plastic zone appears near the front of the Anchorage and the rear end face.
【學(xué)位授予單位】：長江科學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U443.24;U448.25

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