本文選題：溶洞 + 盾構(gòu)管片　； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：目前城市地鐵建設(shè)如火如荼,隧道建設(shè)中遇到巖溶地質(zhì)概率大大增加,溶洞的存在會(huì)對(duì)隧道管片的受力及疲勞壽命產(chǎn)生什么樣的影響?溶洞分布位置、幾何尺寸、溶洞與隧道之間的距離、對(duì)管片疲勞壽命的又有何影響?本文針對(duì)這些問(wèn)題利用abaqus進(jìn)行動(dòng)力數(shù)值模擬計(jì)算,對(duì)在巖溶地質(zhì)條件下列車動(dòng)荷載對(duì)隧道管片的疲勞壽命進(jìn)行了研究。主要研究?jī)?nèi)容為:1)參考國(guó)內(nèi)外學(xué)者的經(jīng)驗(yàn)公式及動(dòng)力計(jì)算的結(jié)果,發(fā)現(xiàn)盾構(gòu)隧道底部?jī)?nèi)側(cè)管片的受拉疲勞壽命最小,故以底部?jī)?nèi)側(cè)管片的受拉疲勞壽命作為隧道管片的疲勞壽命。2)對(duì)比不同動(dòng)載組合方式時(shí)盾構(gòu)隧道管片的疲勞壽命,找出最不利的動(dòng)載組合方式。3)經(jīng)過(guò)計(jì)算對(duì)比顯示:一定埋深下的溶洞,其規(guī)模的大小與盾構(gòu)隧道管片的疲勞壽命有一定的關(guān)聯(lián)。在一定范圍內(nèi),溶洞的尺寸對(duì)管片的疲勞壽命影響甚大。而在溶洞與隧道之間的距離不同時(shí)的隧道管片疲勞壽命對(duì)比來(lái)看,管片的疲勞壽命大體上隨距離增加而增大。距離過(guò)小時(shí),溶洞的存在會(huì)對(duì)管片的疲勞壽命造成較大的影響導(dǎo)致不符合設(shè)計(jì)要求,故在設(shè)計(jì)及施工時(shí)需要對(duì)巖溶地段進(jìn)行探測(cè),確定溶洞與隧道之間的距離。不符合要求的要采取措施進(jìn)行處理。4)管片的疲勞壽命與溶洞所在位置存在關(guān)系,溶洞處在隧道下方時(shí),管片的疲勞壽命隨著隧道與管片的距離增大而增加。而溶洞在隧道下方與溶洞在兩隧道中間的下方相比要不利的多。所以在隧道施工時(shí)要注意探測(cè)隧道下方的溶洞,根據(jù)與隧道的距離判斷是否需要進(jìn)行處理。
[Abstract]:At present, the construction of urban subway is in full swing, the probability of karst geology in tunnel construction is greatly increased. What influence does the existence of karst cave have on the force and fatigue life of tunnel segments? What is the influence of the distance between the karst cave distribution, geometry, the distance between the cave and the tunnel on the fatigue life of the tunnel? This paper aims at these problems The dynamic numerical simulation of ABAQUS is used to study the fatigue life of the tunnel tube under the karst geological conditions. The main research contents are as follows: 1) referring to the empirical formula and the results of dynamic calculation, it is found that the tensile fatigue life of the inner tube in the bottom of the shield tunnel is the smallest, so the inner side of the bottom is in the bottom. As the fatigue life of the tunnel segment as the fatigue life.2 of the tunnel segment, the fatigue life of the shield tunnel segment is compared with the different dynamic load combination mode, and the most unfavorable dynamic load combination mode.3) is found out after calculation and comparison: the size of the cave in the buried depth is related to the fatigue life of the shield tunnel tube. In the fixed range, the size of the cave has a great influence on the fatigue life of the tube, and the fatigue life of the tube increases with the increase of distance in the different distance between the tunnel and the tunnel. The existence of the cavern will cause a greater impact on the fatigue life of the tube. In design and construction, it is necessary to detect the Karst Section in the design and construction, determine the distance between the cave and the tunnel. The fatigue life of the tube is related to the location of the cave where the.4 is not met with the requirements. When the cave is under the tunnel, the fatigue life of the pipe increases with the distance between the tunnel and the tube. The cave below the tunnel is much lower than the cave below the middle of the two tunnel. Therefore, in the tunnel construction, we should pay attention to the cave in the tunnel under the tunnel, and judge whether it needs to be handled according to the distance from the tunnel.

【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)】：U455.43;U231.3

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