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北京典型砂卵石地层土压平衡盾构适应性研究
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摘要
以北京地区典型砂卵石地层盾构工程为背景,从现场掘进试验出发,辅以理论推导与数值模拟分析,以土压平衡盾构施工关键参数为对象,研究了土压平衡盾构与砂卵石地层的适应性特征。系统总结与归纳了北京典型砂卵石地层大粒径卵石、漂石空间分布规律及力学特征,着重从强度、渗透性、颗粒级配、密实度及地层化学成分等方面分析了盾构的适应性要求。根据盾构的几何构造特征及施工特点,推导了土压平衡盾构关键施工参数的理论计算模型,并分析了关键参数的构成及主要影响因素。开展了盾构的现场掘进和土体改良试验,分析了盾构关键参数的变化规律及相关性特征,研究了北京典型砂卵石地层两种刀盘结构型式土压平衡盾构的适应性;同时总结了土压平衡盾构在北京典型砂卵石地层中施工时土体改良剂与盾构掘进模式的匹配性及适应性。利用FLAC3D模拟了砂卵石地层盾构开挖面稳定性特征及地表沉降规律,并分析了开挖面稳定性与支护压力的关系。
As for the key construction parameters of EPB TBM in typical gravel strata of Beijing area, it is studied for its feasibility of EPB TBM and the typical gravel in Beijing Metro with the help of field tests, theoretical research and numerical simulation at the background of EPB TBM excavated in typical gravel strata in line9of Beijing Metro. Mechanical properties and the space distribution rules of large size gravels and boulders are analyzed.And the feasibility requirements of EPB TBM are discussed at the base of strength, permeability, grain composition, compactedness and chemical composition of typical gravel strata in Beijing Metro. According to geometric structure characteristics and construction features of EPB TBM, the theoretical calculation formulas of key parameters are introduced, and its composition and the main influence factors are proposed considering the mechanical characteristics of typical gravel strata. Through field advancing and soil conditioning tests, it is studied that the adaptability of construction parameters with soil properties, internal relationships among these parameters, as well as match relationships and adaptability characteristics of soil improver with advancing modes of EPB TBM in typical gravel strata. Finally, finite difference software FLAC3D is used for simulating the excavation process of EPB TBM in typical gravel strata. At the same time, stability features of EPB TBM tunnel face and laws of ground surface subsidence, and relationships between stability of tunnel face and support pressure are analyzed.
引文
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