| With the continued construction of urban subway, metro shield tunnel encountered a number of "close-construction" problem. In the condition of a variety of different types of underground structures, pile, abutment, and the distribution of underground pipelines and other complex conditions, how to ensure that its safe construction of the tunnel and Geo-environmental security after construction has brought great difficulties to the design and construction, which leads to the focus of the relevant scientific research institutes, design departments and construction units.This paper discusses the problem about Guangzhou rail transit line on the 5th District, Village Station to Station Shield Yangqi range of projects in the area Zhuang Station to Zoo Station and the Zoo Station to Station 2 Yangqi shield interval occurred in the upper and lower close overlap range of design and construction of the tunnel shield technology.Paper first introduces the project location, scope and focus of this project and the difficulties, and proposes a corresponding strategy for these difficulties. Based on the analysis of construction projects at home and abroad similar to the proximity of construction experience, the numerical procedure is conducted by the application of FLAC3D software to stimulate shield small radius curve section of the construction process, which helps to determine the "After first under on" excavation method for this project. Monitoring measurement is one of the key process for the tunnel construction, which is important to keep abreast of the environmental impact information, timely analysis of feedback, timely adjustment of the design and construction program that will guide on-site construction. Paper focused on analyzing the small radius curve segment on-site monitoring program development, monitoring project implementation and monitoring of data processing, according to results of the monitoring of construction sites of key note a comprehensive analysis.
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