复杂地下环境中新建隧道侵入对桩基的力学影响
发布时间：2018-07-27 15:38
【摘要】：在多层多种地下结构相互作用的复杂环境中,新建隧道施工侵入到地下街群桩基础的内部,具有较高的工程风险。通过数值模拟与现场实测,重点研究新建隧道侵入过程对地下街桩位移与内力的影响。结果表明:开挖正洞下部会使与导洞初衬底板相交处的桩段弯矩急剧增大;截桩后,置于正洞上拱部衬砌中的残留桩段轴力明显减小,而衬砌的最小主应力明显增大;与不存在地铁隧道时相比,附近存在地铁隧道时的新建隧道施工引起的地下街桩基沉降会减小,应考虑第三方地下结构的作用。该研究结论可为新建隧道穿越复杂地下结构体系的灾害预防提供参考。
[Abstract]:In the complex environment of multi-story and multi-underground structure interaction, the construction of new tunnel invades the interior of pile group foundation of underground street, which has high engineering risk. Through numerical simulation and field measurement, the influence of new tunnel invasion process on displacement and internal force of pile in underground street is studied. The results show that the bending moment of the pile segment at the intersection of the initial substrate plate of the pilot tunnel will be increased sharply by excavation of the lower part of the main tunnel, and the axial force of the residual pile segment placed in the arch lining of the main tunnel will obviously decrease, and the minimum principal stress of the lining will increase obviously after the pile is cut off. Compared with those without subway tunnel, the settlement of pile foundation of underground street caused by the construction of new tunnel in the vicinity of subway tunnel will be reduced, so the effect of the third party underground structure should be considered. The conclusion can be used as a reference for disaster prevention of new tunnel crossing complex underground structure system.
【作者单位】： 湖南科技大学土木工程学院;中南大学土木工程学院;中铁十五局集团有限公司;
【基金】：中铁第四勘察设计院集团有限公司科技研究开发计划项目(2013K48)资助
【分类号】：TU473.1;U456.3
本文编号：2148295
[Abstract]:In the complex environment of multi-story and multi-underground structure interaction, the construction of new tunnel invades the interior of pile group foundation of underground street, which has high engineering risk. Through numerical simulation and field measurement, the influence of new tunnel invasion process on displacement and internal force of pile in underground street is studied. The results show that the bending moment of the pile segment at the intersection of the initial substrate plate of the pilot tunnel will be increased sharply by excavation of the lower part of the main tunnel, and the axial force of the residual pile segment placed in the arch lining of the main tunnel will obviously decrease, and the minimum principal stress of the lining will increase obviously after the pile is cut off. Compared with those without subway tunnel, the settlement of pile foundation of underground street caused by the construction of new tunnel in the vicinity of subway tunnel will be reduced, so the effect of the third party underground structure should be considered. The conclusion can be used as a reference for disaster prevention of new tunnel crossing complex underground structure system.
【作者单位】： 湖南科技大学土木工程学院;中南大学土木工程学院;中铁十五局集团有限公司;
【基金】：中铁第四勘察设计院集团有限公司科技研究开发计划项目(2013K48)资助
【分类号】：TU473.1;U456.3
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