發(fā)布時(shí)間：2018-09-17 14:30

【摘要】：隨著城市地下空間工程的蓬勃發(fā)展,城市地鐵交通工程迎來(lái)了發(fā)展的高峰,新建地鐵隧道下穿既有車(chē)站的巖土工程技術(shù)問(wèn)題也將大量涌現(xiàn)出來(lái)。新建隧道在施工過(guò)程中將對(duì)周?chē)鷰r層產(chǎn)生二次擾動(dòng),同時(shí)既有車(chē)站結(jié)構(gòu)也將產(chǎn)生新的變形和附加內(nèi)力。為了實(shí)現(xiàn)地鐵隧道工程安全、經(jīng)濟(jì)、環(huán)保的設(shè)計(jì)理念,了解地鐵工程施工過(guò)程中下穿既有車(chē)站結(jié)構(gòu)的影響是十分必要的。本文主要以重慶地鐵環(huán)線下穿三號(hào)線重慶北站車(chē)站為工程背景,通過(guò)Midas GTS有限元軟件進(jìn)行數(shù)值模擬與施工開(kāi)挖步驟分析。著重研究地鐵隧道開(kāi)挖對(duì)車(chē)站的沉降量和結(jié)構(gòu)內(nèi)力的影響。主要的研究?jī)?nèi)容及成果如下:①采用巖土力學(xué)方法分析下穿隧道對(duì)既有地鐵車(chē)站的影響和變形機(jī)理,研究夾層土體對(duì)下穿隧道的影響。②分析對(duì)比地鐵隧道常用施工方法,結(jié)合重慶北站工程具體情況,選取了合理的施工方案。③以重慶北站南廣場(chǎng)軌道交通環(huán)線下穿軌道交通三號(hào)線重慶北站為工程背景,通過(guò)Midas—GTS建立三維實(shí)體模型,在存在受深基坑等結(jié)構(gòu)物的復(fù)雜條件下,對(duì)地鐵隧道下穿既有地鐵車(chē)站進(jìn)行了數(shù)值模擬計(jì)算,得到地鐵車(chē)站的結(jié)構(gòu)變形的影響特征和規(guī)律。④運(yùn)用PKPM對(duì)軌道交通三號(hào)線重慶北站地鐵車(chē)站進(jìn)行內(nèi)力驗(yàn)算,對(duì)車(chē)站梁柱結(jié)構(gòu)內(nèi)力進(jìn)行分析。⑤通過(guò)結(jié)構(gòu)位移計(jì)算和結(jié)構(gòu)內(nèi)力計(jì)算,確定了重慶北站南廣場(chǎng)軌道交通環(huán)線下穿軌道交通三號(hào)線重慶北站的設(shè)計(jì)方案的可行性。
[Abstract]:With the vigorous development of urban underground space engineering, the urban subway traffic engineering has ushered in the peak of development, and the geotechnical problems of the new subway tunnel passing through the existing stations will also emerge in large numbers. During the construction of the new tunnel, the surrounding rock layer will be disturbed twice, and the new deformation and additional internal force will also occur in both the station structure and the construction process. In order to realize the design concept of safety, economy and environmental protection in subway tunnel engineering, it is necessary to understand the influence of the existing station structure in the course of subway construction. In this paper, based on the engineering background of Chongqing North Railway Station, Midas GTS finite element software is used to carry out numerical simulation and excavation analysis. The influence of subway tunnel excavation on station settlement and structural internal force is studied. The main research contents and results are as follows: 1 the influence and deformation mechanism of underpass tunnel on existing subway station is analyzed by geotechnical mechanics method, and the influence of interlayer soil on underpass tunnel is analyzed and compared with common construction methods of subway tunnel. According to the specific conditions of Chongqing North Railway Station, the reasonable construction scheme .3 is selected to set up a three-dimensional solid model through Midas-GTS, taking Chongqing North Railway Station as the engineering background, and taking Chongqing North Railway Station as the engineering background under the rail transit ring line of the south square of Chongqing North Railway Station. Under the complicated condition of deep foundation pit and other structures, the numerical simulation of subway tunnel passing through the existing subway station is carried out. The influence characteristics and regularity of the structural deformation of the subway station are obtained. 4. The internal force of the subway station of Chongqing North Railway Station on the third Line of Rail Transit is checked and calculated by using PKPM. By analyzing the structural internal force of Liang Zhu, the feasibility of the design scheme of Chongqing North Railway Station is determined by calculating the displacement of structure and the calculation of internal force of structure.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U231.4;U456.3

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本文編號(hào)：2246218