本文關(guān)鍵詞：高地應(yīng)力下圍巖蠕變對(duì)隧道結(jié)構(gòu)長(zhǎng)期安全性的影響分析　出處：《西南交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 高地應(yīng)力 圍巖蠕變 襯砌結(jié)構(gòu) 裂損二次襯砌 長(zhǎng)期安全性

【摘要】：隨著我國(guó)經(jīng)濟(jì)社會(huì)的發(fā)展和西部大開(kāi)發(fā)的快速推進(jìn),西部艱險(xiǎn)山區(qū)的隧道工程也越來(lái)越多。這些隧道大多具有"長(zhǎng)、大、深埋"的特點(diǎn),且由于構(gòu)造應(yīng)力場(chǎng)的影響,圍巖的蠕變效應(yīng)會(huì)導(dǎo)致襯砌結(jié)構(gòu)所受外荷載隨著時(shí)間的增加不斷增大,從而影響結(jié)構(gòu)長(zhǎng)期服役的安全性。本文依托籃家?guī)r隧道工程,通過(guò)理論分析、室內(nèi)試驗(yàn)和數(shù)值模擬等手段,開(kāi)展了高地應(yīng)力條件下圍巖蠕變對(duì)隧道結(jié)構(gòu)長(zhǎng)期安全性的影響研究。主要研究工作如下:1.采用巖石力學(xué)系統(tǒng)與聲發(fā)射測(cè)試系統(tǒng)開(kāi)展了室內(nèi)單軸和三軸壓縮試驗(yàn),并繪制巖石的應(yīng)力-應(yīng)變?nèi)^(guò)程曲線,對(duì)不同圍壓與不同含水狀態(tài)下深埋碳質(zhì)板巖的物理力學(xué)特性進(jìn)行了研究。研究發(fā)現(xiàn),水對(duì)碳質(zhì)板巖的力學(xué)特性及其破裂特征具有明顯的軟化效應(yīng);碳質(zhì)板巖的力學(xué)參數(shù)隨著圍壓的增大而增大;低圍壓條件下巖石強(qiáng)度低,巖石的破裂更為迅速和突然,而高圍壓條件下巖石的漸進(jìn)破裂特性更為顯著,延塑性增強(qiáng)。2.采用快速拉格朗日有限差分軟件建立了地層-結(jié)構(gòu)三維數(shù)值模型,在該模型中,圍巖采用基于M-C屈服準(zhǔn)則的伯格斯蠕變模型(Cvisc模型)以考慮圍巖的粘彈塑性效應(yīng)對(duì)隧道結(jié)構(gòu)長(zhǎng)期安全性的影響�；谠撃Ｐ�,揭示了不同構(gòu)造應(yīng)力場(chǎng)對(duì)二次襯砌結(jié)構(gòu)長(zhǎng)期安全性能的影響。計(jì)算結(jié)果表明,構(gòu)造應(yīng)力場(chǎng)會(huì)對(duì)二次襯砌的長(zhǎng)期安全特性產(chǎn)生顯著影響,不同構(gòu)造應(yīng)力下二次襯砌達(dá)到臨界安全狀態(tài)的位置與大修時(shí)刻點(diǎn)存在顯著區(qū)別。3.采用地層-結(jié)構(gòu)三維數(shù)值模型,研究了圍巖蠕變對(duì)裂損二次襯砌安全性能的影響。數(shù)值模型中,采用interface界面單元模擬裂損二次襯砌,二次襯砌的裂損程度采用裂縫截面的剛度折減系數(shù)η表示。考慮二次襯砌的不同裂損程度以及不同裂縫數(shù)量與開(kāi)裂位置的組合,探明了不同工況下裂損二次襯砌結(jié)構(gòu)內(nèi)力和安全系數(shù)隨時(shí)間的變化規(guī)律。計(jì)算結(jié)果表明,裂損程度對(duì)開(kāi)裂位置處截面安全系數(shù)的影響較為明顯,而對(duì)未開(kāi)裂位置處截面安全系數(shù)的影響較小;二次襯砌的安全系數(shù)隨著裂紋數(shù)量的增加而減小;不同裂損工況下二次襯砌達(dá)到臨界安全狀態(tài)的位置與大修加固時(shí)間存在顯著差異。
[Abstract]:With the development of our country's economy and society and the rapid development of the western region, there are more and more tunnel projects in the western hard and dangerous mountain areas. Most of these tunnels have the characteristics of "long, large and deep buried". Because of the influence of tectonic stress field, the creep effect of surrounding rock will cause the external load of lining structure to increase with the increase of time, thus affecting the safety of the structure in service for a long time. Through theoretical analysis, laboratory tests and numerical simulation and other means. The influence of surrounding rock creep on the long-term safety of tunnel structure under high in-situ stress is studied. The main work is as follows:. 1. Uniaxial and triaxial compression tests were carried out with rock mechanics system and acoustic emission test system. The stress-strain curves are drawn and the physical and mechanical properties of deep buried carbonaceous slate under different confining pressures and different water-bearing states are studied. Water has obvious softening effect on mechanical properties and fracture characteristics of carbonaceous slate. The mechanical parameters of carbonaceous slate increase with the increase of confining pressure. Under the condition of low confining pressure, the strength of rock is low, the fracture of rock is more rapid and sudden, and the progressive fracture of rock under high confining pressure is more obvious. In this model, a three-dimensional numerical model of stratigraphic structure is established by using the fast Lagrangian finite difference software. The Boggs creep model based on M-C yield criterion and Cvisc model are used to consider the influence of visco-elastoplastic effect of surrounding rock on the long-term safety of tunnel structure. The effects of different tectonic stress fields on the long-term safety performance of secondary lining structures are revealed. The calculation results show that the structural stress field will have a significant impact on the long-term safety characteristics of secondary lining. There is a significant difference between the position of the secondary lining under different tectonic stresses and the critical safety state of the secondary lining and the moment point of overhaul. 3. A three-dimensional numerical model of stratigraphic structure is used. The influence of the creep of surrounding rock on the safety performance of the secondary lining with crack is studied. In the numerical model, the interface interface element is used to simulate the secondary lining. The cracking degree of the secondary lining is expressed by the stiffness reduction coefficient 畏 of the crack section, and the combination of the number of cracks and the crack location is considered. The variation law of internal force and safety factor of the secondary lining structure with time under different working conditions is investigated. The calculated results show that the degree of crack damage has an obvious effect on the safety factor of the section at the crack location. However, the effect on the safety factor of the section at the uncracked position is relatively small. The safety factor of the secondary lining decreases with the increase of the number of cracks. There are significant differences between the position of the secondary lining under different cracking conditions and the time of overhaul and reinforcement.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U451

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