本文關(guān)鍵詞：頂管上穿施工對既有地鐵隧道的影響分析　出處：《湘潭大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 頂管施工 地鐵隧道 變形監(jiān)測 FLAC3D 控制措施

【摘要】：隨著我國城市軌道交通網(wǎng)工程的不斷進行，地鐵建設(shè)在城市軌道交通建設(shè)中所占的比例越來越重。而頂管技術(shù)作為一種在我國市政管道建設(shè)中得到廣泛應(yīng)用的非開挖施工方法，在進行施工時會對頂管四周的土體產(chǎn)生擾動，，引起土體產(chǎn)生位移和變形。因此，當(dāng)頂管施工面臨跨越既有地鐵隧道的情況時，將會對地鐵隧道產(chǎn)生影響，危及地鐵隧道的安全。本文以杭州市某污水管道上穿既有地鐵隧道為背景，研究頂管在上穿施工過程中對其下方既有地鐵隧道所產(chǎn)生的變形的分布形態(tài)和影響規(guī)律。主要研究內(nèi)容和成果如下： （1）從頂管的施工特點入手，系統(tǒng)地探討了頂管施工引起土體和地下管線的變形特性，分析表明：既有地鐵隧道在頂管開挖作用下的變形主要受土體損失的影響。 （2）結(jié)合杭州市某污水總管上穿地鐵一號線車站區(qū)間項目工程，針對頂管施工給地鐵隧道所造成的影響進行了現(xiàn)場監(jiān)控量測，分析了地鐵隧道在頂管開挖工程中的豎向位移、水平位移規(guī)律以及地表沉降規(guī)律。研究發(fā)現(xiàn)：頂管開挖對既有地鐵隧道的擾動范圍為既有地鐵隧道前后10m左右；既有地鐵隧道在頂管開挖的影響下，其變形最大的部分處于頂管軸線下方，其變形曲線近似槽狀分布；并且地鐵隧道之間的空間位置對地鐵隧道的變形有一定的影響。 （3）根據(jù)工程背景，利用有限差分軟件FLAC3D，對頂管上穿既有地鐵隧道這一施工過程進行模擬，通過模擬結(jié)果與工程現(xiàn)場監(jiān)測結(jié)果進行對比分析，驗證了模型的可靠性。并在此基礎(chǔ)上探討了在頂管推進過程中，頂管與地鐵盾構(gòu)隧道的垂直距離、頂管管徑、頂管管材以及地鐵所處土層的屬性等不同工況對地鐵盾構(gòu)隧道的影響。研究表明：數(shù)值模擬結(jié)果與實測曲線吻合較好，F(xiàn)LAC3D能很好的對頂管上穿既有地鐵隧道這一施工過程進行模擬；地鐵隧道的變形受不同頂管施工工況的影響較大，在實際工程中，選擇合適的施工參數(shù)有利于控制地鐵隧道的變形。 （4）根據(jù)研究成果以及工程實際情況，總結(jié)歸納了施工控制措施，包括施工風(fēng)險控制及建議、對擾動區(qū)土體加固以及監(jiān)測控制。從監(jiān)測的結(jié)果來看，這些措施有效的控制了地鐵隧道的變形。
[Abstract]:With the development of urban rail transit network in China. Subway construction is more and more important in the construction of urban rail transit. Pipe jacking technology is widely used as a non-excavation construction method in the construction of municipal pipelines in China. During the construction, the soil around the pipe jacking will be disturbed, resulting in the displacement and deformation of the soil. Therefore, when the pipe jacking construction is faced with the situation of crossing the existing subway tunnel, it will have an impact on the subway tunnel. The safety of subway tunnel is endangered. The background of this paper is to pass through the existing subway tunnel on a sewage pipe in Hangzhou. This paper studies the distribution pattern and influence law of the deformation caused by the existing subway tunnel under the pipe jacking in the process of jacking construction. The main research contents and results are as follows: 1) based on the characteristics of pipe jacking construction, the deformation characteristics of soil and underground pipeline caused by pipe jacking construction are systematically discussed. The analysis shows that the deformation of existing subway tunnel under the action of pipe jacking is mainly affected by soil loss. Combined with the project of station section of No. 1 subway line on a sewage pipe in Hangzhou, the site monitoring and measurement of the influence caused by pipe jacking construction on subway tunnel is carried out. The vertical displacement of subway tunnel in pipe jacking excavation is analyzed. It is found that the disturbance range of pipe jacking excavation to the existing subway tunnel is about 10 m before and after the existing subway tunnel; Under the influence of pipe-jacking excavation, the largest deformation of the existing subway tunnel lies below the pipe-jacking axis, and the deformation curve is similar to the groove distribution. And the space position between the subway tunnel has certain influence on the deformation of the subway tunnel. According to the engineering background, the construction process of pipe-jacking through the existing subway tunnel is simulated by using finite-difference software FLAC3D. The reliability of the model is verified. On this basis, the vertical distance and pipe jacking diameter between the pipe jacking and the shield tunnel in the process of pipe jacking are discussed. The effects of pipe jacking material and soil properties of subway on the shield tunneling are studied. The results show that the numerical simulation results are in good agreement with the measured curves. FLAC3D can well simulate the construction process of pipe-jacking through the existing subway tunnel; The deformation of subway tunnel is greatly affected by different pipe-jacking conditions. In practical engineering, choosing appropriate construction parameters is helpful to control the deformation of subway tunnel. 4) according to the research results and the actual situation of the project, summarized the construction control measures, including construction risk control and suggestions, soil reinforcement and monitoring control in disturbed areas. From the monitoring results. These measures effectively control the deformation of subway tunnel.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U231.1;TU990.3

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