穿越城市轨道交通软弱路基段施工工艺及周边环境响应分析
Construction Technology and Surrounding Environment Response Analysis of Passing through Weak Subgrade Section of Urban Rail Transit

本文依托南京河西地区城际轨道交通8号线换乘通道暗挖法下穿既有轨道交通线路2号线油坊桥站折返线，详细介绍了暗挖法大管棚施工、全断面注浆、CRD开挖方法、钢架安装及喷射混凝土施工等施工工艺，并对施工过程引起的路基隆沉变化及影响范围作了分析；暗挖法施工过程前期注浆过程引起路基隆起最大值达到250.0 mm，影响范围达到40.0 m；暗挖法掘进过程地表出现下沉趋势，下沉量最大到40.0 mm，影响范围达到30.0 m；通道暗挖法施工决定路基隆沉变化量主要因素是注浆压力，路基载浆液凝固期间有所下沉，数值相对较小。
Based on the underground excavation method of transfer passage of Nanjing Hexi Intercity Rail Transit Line 8 to cross the turn back line of youfangqiao station of existing rail transit line 2, this paper introduces in detail the construction technology of underground excavation method such as large pipe shed construction, full section grouting, CRD excavation method, steel frame installation and shotcrete construction, and analyzes the subgrade heave change and influence scope caused by the construction process. In the early stage of excavation construction, the maximum value of subgrade heave caused by grouting reaches 250.0 mm, with an influence range of 40.0 m; in the process of excavation by excavation, the ground surface tends to sink, with a maximum subsidence of 40.0 mm, with an influence range of 30.0 m; the main factor determining the change of subgrade heave is grouting pressure, which sinks during the solidification of subgrade bearing slurry, with a relatively small value.