宁波轨道交通3号线出入段线类矩形盾构隧道工程勘察实践与建议

发布时间：2018-07-24 13:31

【摘要】：为了解决软土城市开展国内首条类矩形盾构隧道工程勘察遇见的技术难题,从勘察执行的技术标准及等级的确定、勘察的重难点、勘察方案、高流变性软土工程地质特征、场地水文地质条件、工程措施建议等方面进行分析。主要得出以下结论:1)按现行《城市轨道交通岩土工程勘察规范》3.0.8条文及说明、7.3.5条文分别确定软土地区场地复杂程度等级、类矩形盾构隧道工程勘探孔深度,结果往往会偏于保守、安全,势必会造成勘察工作量浪费问题;2)在第四纪松散海相沉积软土地区建设类矩形盾构隧道,按中等复杂场地控制勘探孔间距,以分别进入隧道底以下不小于2H(一般性孔,H为隧道高)、3H(控制性孔)控制勘探孔孔深是经济合理且满足工程需求的;3)本工程勘察方案对今后类矩形盾构隧道工程勘察及相关勘察规范标准修编具有一定的参考价值。
[Abstract]:In order to solve the technical problems encountered in the investigation of the first rectangular shield tunnel in soft soil cities in China, the technical standards and grades of the investigation and execution, the heavy difficulties in the investigation, the investigation scheme and the engineering geological characteristics of the high fluidity soft soil are determined. Site hydrogeological conditions, engineering measures and other aspects of the analysis. The main conclusions are as follows: (1) according to the provisions of the current geotechnical survey code for urban rail transit > 3.0.8 and the description of 7.3.5, the grade of site complexity and the depth of exploration holes in rectangular shield tunnel engineering are determined respectively. The results tend to be conservative and safe, which will inevitably lead to the waste of investigation workload. 2) the construction of rectangular shield tunnel in the soft soil area of loose marine sediments in the Quaternary, and the spacing of exploration holes is controlled according to the medium complex site. It is economical and reasonable to control the depth of exploration hole to be not less than 2H (general hole H is tunnel height) and 3H (control hole) respectively into the bottom of tunnel. It is economical and reasonable to meet the need of engineering. The investigation plan of this project will be applied to the exploration of rectangular shield tunnel in the future. The inspection and related investigation standard revision has certain reference value.
【作者单位】：宁波市轨道交通集团有限公司;宁波工程学院;
【分类号】：U455.43

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