双向框架式湖底隧道抗拔桩受力分析及布置优化

发布时间：2019-01-26 15:21

【摘要】：目前国内外对明挖湖底隧道抗拔桩受力缺乏系统分析,导致抗拔桩布置存在不合理之处。基于合肥市方兴湖隧道工程设计与实践,对湖底隧道抗拔桩受力进行现场测试与数值分析,探究了双向框架式湖底隧道抗拔桩受力特征,提出抗拔桩布置优化方法。研究结果表明,方兴湖隧道左右边墙下抗拔桩承受压力,管廊下抗拔桩承受较小拉力,只有左右洞室跨中下抗拔桩较好地发挥了抗拔作用。根据内力和抗裂验算,受拉的抗拔桩具有一定的安全盈余。建议去掉左右边墙和管廊下未发挥抗拔作用的桩体,使抗拔桩数量减少20%,隧道结构-桩-土数值分析结果表明,抗拔桩结构体系得到明显优化,抗拔桩抗拉强度得到有效利用,而且上部主体框架结构的安全性变化不大,满足结构安全要求。
[Abstract]:At present, there is a lack of systematic analysis at home and abroad on the force of uplift pile in open excavation lakebottom tunnel, which leads to unreasonable arrangement of anti-pulling pile. Based on the engineering design and practice of Fangxing Lake Tunnel in Hefei City, the field test and numerical analysis of uplift pile force are carried out on the bottom of the lake tunnel, and the mechanical characteristics of the anti-pulling pile in the bi-directional frame type lake-bottom tunnel are explored, and the optimization method of anti-drawing pile layout is put forward. The results show that the uplift pile under the left and right side wall of the Fangxing Lake Tunnel bears the pressure, and the pile under the pipe gallery bears a relatively small tensile force, and only the right and left caverns span the middle and lower drawing piles play a better role in the anti-drawing action. According to the internal force and crack-resistance check calculation, the pull-out pile has a certain safety surplus. It is suggested to remove the pile body which has not played the role of anti-drawing under the left and right side wall and pipe gallery, so as to reduce the number of uplift piles by 20. The results of numerical analysis of tunnel structure-pile-soil show that the structure system of uplift pile is obviously optimized. The tensile strength of the uplift pile is used effectively, and the safety of the upper main frame structure has little change, which meets the structural safety requirements.
【作者单位】：中南大学土木工程学院;铁道第三勘察设计院集团有限公司广东分公司;
【基金】：国家自然科学基金青年资金项目(51208516) 国家科技支撑计划(2012BAK24B02) 中国博士后科学基金资助项目(2014M550424)
【分类号】：TU473.1;TU312.1

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