砂卵石地层土压力平衡盾构施工开挖面稳定及邻近建筑物影响模型试验研究

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摘要盾构技术在砂卵石地层中应用越来越多，砂卵石地层具有很强的不确定性特征，盾构施工的关键问题之一是保持开挖面稳定性及减小地面沉降。利用土压平衡盾构模型，研究北京砂卵石地层中不同埋深时邻近建筑物影响下的开挖面稳定性及地表沉降规律。试验中，分析柔性基础邻近建筑物及埋深对开挖面极限支护力和地表沉降的影响，揭示开挖面稳定性、土拱效应与极限支护力及地表沉降的关系。在邻近建筑物影响下，砂卵石地层中的支护压力呈非对称分布，且砂卵石地层中盾构推进引起的沉降值大于基于Peck公式的计算值，研究成果对砂卵石地层中盾构施工有重要的指导意义。

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关键词 ：土力学, 模型试验, 砂卵石, 土压平衡盾构, 邻近建筑物, 地表沉降, 开挖面

Abstract：The shield tunneling technology has been widely used in the construction in sandy cobble ground， which has very strong uncertainty characteristics. The excavation face stability and the ground settlement are the key problems in the shield tunneling. In order to simulate the construction of earth pressure balance(EPB) shield tunneling，an indoor model test with different cover depths is applied to find out the law of limit support pressure on excavation face，soil arch effect and ground settlement in sand cobble ground of Beijing under the influence of adjacent buildings with flexible shallow foundation. The support pressure is unsymmetrical and the ground settlement is larger than the theoretical value by Peck equation under the influence of adjacent buildings. The results would be beneficial to guide the construction of EPB shield tunneling in sandy cobble ground.

Key words： soil mechanics model test sandy cobble ground earth pressure balance(EPB) shield adjacent building ground settlement excavation face

收稿日期: 2013-05-27

引用本文:

范祚文1，2，张子新1，2. 砂卵石地层土压力平衡盾构施工开挖面稳定及邻近建筑物影响模型试验研究[J]. 岩石力学与工程学报, 2013, 32(12): 2506-2512.
FAN Zuowen1，2，ZHANG Zixin1，2. MODEL TEST OF EXCAVATION FACE STABILITY OF EPB SHIELD IN SANDY COBBLE GROUND AND ADJACENT BUILDING EFFECT. , 2013, 32(12): 2506-2512.

链接本文:

http://www.rockmech.org/CN/Y2013/V32/I12/2506

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