本文關(guān)鍵詞： 隧道 蠕變變形 有限差分 數(shù)值模擬 新奧法　出處：《河北工程大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國公路工程的快速發(fā)展，在軟巖狀況下修建的公路隧道越來越多，新奧法施工在軟巖隧道修建中具有很大的優(yōu)勢，其認(rèn)為圍巖具有一定的承載能力，能夠和支護(hù)結(jié)構(gòu)協(xié)同工作，，形成共同的載體，既允許圍巖存在一定的變形，從而最大限度的發(fā)揮圍巖的自承能力，而合理的二次襯砌支護(hù)時機(jī)可以充分的調(diào)動支護(hù)體系，是新奧法施工成功的關(guān)鍵。在軟巖狀態(tài)下的修建隧道及地下工程時，圍巖及支護(hù)結(jié)構(gòu)應(yīng)力和應(yīng)變相對復(fù)雜，并變現(xiàn)出和時間有著很大的關(guān)系，具有較大的流變性，所以在軟巖地區(qū)進(jìn)行新奧法設(shè)計(jì)施工時不能僅僅采用彈塑性理論進(jìn)行描述。 本文以分水嶺隧道為背景依托，在復(fù)變理論與保角變換相結(jié)合的基礎(chǔ)上，引用了復(fù)雜隧洞斷面任一點(diǎn)的位移表達(dá)式，從而結(jié)合現(xiàn)場監(jiān)測數(shù)據(jù)反演得到分水嶺隧道的burger模型參數(shù)。采用FLAC3D有限差分軟件，在隧道開挖中考慮巖石的蠕變作用，分析了開挖后隧道的彈塑性變化，以及蠕變作用下隧道圍巖、支護(hù)結(jié)構(gòu)的應(yīng)力和應(yīng)變變化規(guī)律，并假定在不同時刻施加二次襯砌，分析隧道結(jié)構(gòu)的變化情況，從而結(jié)合規(guī)范要求確定了分水嶺隧道最佳二次襯砌時機(jī)。 在burger模型基礎(chǔ)上分析了隧道建成100年內(nèi)圍巖蠕變變化情況，以及二次襯砌在蠕變作用下的受力狀態(tài)，從而得到隧道周圍應(yīng)力場和位移場分布規(guī)律。結(jié)果表明隨著時間增長，隧道圍巖逐漸趨于均勻化，但在洞口拱腳處出現(xiàn)應(yīng)力集中現(xiàn)象，二次襯砌內(nèi)拱腳部位彎矩和軸力也逐漸增大，所以要特別注意拱腳處的監(jiān)測和加固。
[Abstract]:With the rapid development of highway engineering in China, more and more highway tunnels are built under the condition of soft rock. Can work with the support structure to form a common carrier, both allow the existence of certain deformation surrounding rock, so as to maximize the self-supporting capacity of surrounding rock. And reasonable secondary lining support timing can fully mobilize the support system, is the key to the success of the construction of the new Austrian method. In the soft rock state of the construction of tunnels and underground works. The stress and strain of surrounding rock and supporting structure are relatively complex, and the realization has a great relationship with time, and has great rheology. Therefore, the elastoplastic theory can not be used to describe the design and construction of the new Austrian method in soft rock area. Based on the background of watershed tunnel and the combination of complex theory and conformal transformation, the displacement expression of any point in the section of complex tunnel is quoted in this paper. The parameters of burger model of watershed tunnel are obtained by inversion of field monitoring data. The creep effect of rock is considered in tunnel excavation by FLAC3D finite difference software. The elastoplastic change of tunnel after excavation and the variation of stress and strain of surrounding rock and support structure under creep are analyzed, and the variation of tunnel structure is analyzed on the assumption that secondary lining is applied at different time. The optimal secondary lining time of watershed tunnel is determined according to the specification. On the basis of burger model, the creep change of surrounding rock in 100 years after completion of tunnel is analyzed, and the stress state of secondary lining under creep action is analyzed. The distribution of stress field and displacement field around the tunnel is obtained. The results show that with the increase of time, the surrounding rock of the tunnel tends to be homogenized, but the stress concentration occurs at the arch foot of the tunnel. The bending moment and axial force of the inner arch foot of the secondary lining also increase gradually, so special attention should be paid to the monitoring and strengthening of the arch foot.
【學(xué)位授予單位】：河北工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U451.2

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