【摘要】：受沿線物業(yè)開發(fā)的影響，全國各地城市軌道交通結構安全保護工作面臨來自地鐵隧道側方基坑工程所帶來的巨大挑戰(zhàn)。盾構隧道一方面由于自身優(yōu)勢在城市地鐵隧道線路中所占比例越來越大，另一方面由于受側方基坑工程施工擾動的影響，導致嚴重隧道病害的案例也時有發(fā)生。為解決地鐵盾構隧道在外部作業(yè)施工擾動下的安全保護問題，在土地規(guī)劃和側方基坑開挖對地鐵安全保護影響初步技術審查的工作中，控制隧道與基坑最小水平凈距成為了一種能同時達到合理利用地鐵沿線土地和保障隧道結構安全目的的實用方法。然而，目前針對如何合理劃分安全水平凈距的研究卻較少。 本文從地鐵安全保護角度出發(fā)，針對上砂下巖特殊地層條件，結合已有研究，采用三維數(shù)值分析手段，研究了以地鐵盾構隧道總位移量5mm和10mm為目標控制下的安全水平凈距的劃分過程，并結合工程案例，說明了安全水平凈距劃設的實用性與合理性。 主要的研究工作如下： （1）簡述了側方基坑工程對地鐵隧道結構影響規(guī)律的理論和基于安全水平凈距的地鐵隧道結構安全保護方法的研究現(xiàn)狀。 （2）歸納了上砂下巖地層條件下側方基坑開挖引起隧道位移的影響因素。通過數(shù)值模擬手段，研究了不同側方基坑開挖深度和隧道周邊所處土層物理力學參數(shù)，，以5mm和10mm為目標位移控制條件下的地鐵盾構隧道與側方基坑之間的安全水平凈距。 （3）分析了地下水、隧道結構的埋深與縱向剛度、基坑的變形控制與尺寸效應對安全水平凈距值的影響，并對相關影響因素下的安全水平凈距值進行了修正與探討。 （4）將研究成果初步應用于實際工程。
[Abstract]:Under the influence of property development along the line, the safety protection of urban rail transit structure in all parts of the country is facing great challenges from the side foundation pit engineering of subway tunnel. On the one hand, shield tunnel accounts for more and more proportion in urban subway tunnel line because of its own advantages, on the other hand, due to the influence of lateral foundation pit construction disturbance, serious tunnel diseases also occur from time to time. In order to solve the problem of safety protection of subway shield tunnel under the disturbance of external operation construction, in the preliminary technical examination of the influence of land planning and side foundation pit excavation on subway safety protection, Controlling the minimum horizontal net distance between tunnel and foundation pit has become a practical method to make rational use of land along subway and to ensure the safety of tunnel structure at the same time. However, there are few studies on how to reasonably divide the net distance of safety level. In this paper, from the point of view of subway safety protection, according to the special formation conditions of upper sand and rock, combined with the existing research, three-dimensional numerical analysis method is adopted. This paper studies the division process of safety level net distance under the control of total displacement 5mm and 10mm of subway shield tunnel, and explains the practicability and rationality of safety level net distance setting combined with engineering cases. The main research work is as follows: (1) the theory of the influence of lateral foundation pit engineering on subway tunnel structure and the research status of subway tunnel structure safety protection method based on safety level net distance are briefly described. (2) the influencing factors of tunnel displacement caused by lateral foundation pit excavation under the condition of upper sand and lower rock strata are summarized. By means of numerical simulation, the excavation depth of different side foundation pit and the physical and mechanical parameters of soil around the tunnel are studied. The safe horizontal net distance between subway shield tunnel and side foundation pit is controlled by 5mm and 10mm. (3) the influence of buried depth and longitudinal stiffness of groundwater and tunnel structure, deformation control and size effect of foundation pit on the net distance value of safety level is analyzed, and the net distance value of safety level under related influencing factors is revised and discussed. (4) the research results are preliminarily applied to practical engineering.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U455.43;U231

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