【摘要】：隨著經(jīng)濟社會的快速發(fā)展,平行頂管的施工越來越廣泛。本文的研究主要針對平行頂管施工中的相互影響,具體研究內(nèi)容如下:(1)對平行頂管相互影響的機理進行了研究,包括:平行頂管施工過程中先行管、土體與后行管三者之間的相互響應關(guān)系;受擾動后土體的應力狀態(tài)變化;不同施工因素對平行頂管施工過程中土體沉降的影響等。(2)對平行頂管引起土體沉降的Peck計算公式進行了總結(jié)歸納,并在疊加法的基礎上提出了Peck擾動因子修正公式,該公式經(jīng)實踐證明應用效果較好。(3)使用有限元軟件Midas/GTS NX對平行頂管施工過程進行了三維模擬,分析了施工過程中土體的應力應變狀態(tài);同時,對比分析了不同管間距、管道埋深、管徑條件下土體沉降曲線的變化規(guī)律,得出了如下結(jié)論:(1)平行頂管施工中先行管對后行管的擾動更較大,最終地表豎向沉降曲線軸線偏向先行管;(2)平行頂管隨著管間距的增加,地表土體沉降曲線的形狀由較近時的“V”形向“U”形過渡,最終逐步轉(zhuǎn)變?yōu)椤癢”形;(3)平行頂管隨著管道埋深的增加,地表土體最大沉降值減小,地表沉降曲線形狀變寬,范圍變大,由“窄而深”向“寬而淺”轉(zhuǎn)變,但其位移云圖的對稱性保持不變;(4)平行頂管隨著管徑增大,管周土體的損失與注漿區(qū)增大,地表沉降增大。地表沉降曲線的軸線偏向管徑較大的管道一側(cè)。(4)結(jié)合平行頂管工程地表沉降監(jiān)測數(shù)據(jù),分別進行了Peck理論計算與Midas/GTS NX數(shù)值模擬研究,并對三者進行了對比分析,驗證了理論公式與三維數(shù)值模擬研究的正確性。
[Abstract]:With the rapid development of economy and society, the construction of parallel pipe jacking is more and more extensive. The research of this paper mainly aims at the interaction in parallel pipe jacking construction, the concrete research contents are as follows: (1) the mechanism of parallel pipe jacking interaction is studied, including: the advance pipe in the process of parallel pipe jacking construction, The response relationship between soil and backward pipe; The stress state of soil changes after disturbance; The influence of different construction factors on soil settlement in the process of parallel pipe jacking construction is summarized. (2) the Peck formula of soil settlement caused by parallel pipe jacking is summarized and summarized, and the modified formula of Peck disturbance factor is put forward on the basis of superposition method. The application effect of the formula is proved to be good by practice. (3) the 3D simulation of parallel pipe jacking construction process is carried out by using the finite element software Midas/GTS NX, and the stress and strain state of soil during the construction process is analyzed. At the same time, the variation law of soil settlement curve under different pipe spacing, pipeline buried depth and pipe diameter is compared and analyzed, and the following conclusions are drawn: (1) the disturbance of advance pipe to backward pipe is greater in parallel pipe jacking construction. Finally, the axis of the vertical settlement curve of the surface deviates to the leading pipe. (2) with the increase of pipe spacing, the shape of settlement curve of surface soil changes from "V" shape to "U" shape, and finally gradually changes to "W" shape; (3) with the increase of pipeline buried depth, the maximum settlement value of surface soil decreases, and the shape and range of surface subsidence curve become wider and wider, which changes from "narrow and deep" to "wide and shallow", but the symmetry of displacement cloud map remains unchanged. (4) with the increase of pipe diameter, the loss of soil and grouting area around the pipe increases, and the surface subsidence increases. The axis of the surface subsidence curve deviates to the side of the pipeline with large diameter. (4) combined with the monitoring data of the surface subsidence of the parallel pipe jacking project, the Peck theoretical calculation and Midas/GTS NX numerical simulation are carried out respectively, and the three are compared and analyzed. The correctness of the theoretical formula and three-dimensional numerical simulation is verified.
【學位授予單位】：中國地質(zhì)大學(北京)
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU990.3
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本文編號：2493947