2015年8月上第44卷第15期
DOI:10. 7672/sgjs2015150105
施工技术
CONSTRUCTION TECHNOLOGY
格栅式地下连续墙桥梁基础沉降计算研究*
文华，罗鑫，何明晋2
（1.西南科技大学土木工程与建筑学院，四川绵阳621000；2.成都市城乡建设委员会，四川成都610094）【摘要】格栅式地下连续墙基础是一种新型的高速铁路桥梁基础，对于桥梁基础而言，其沉降控制已经成为高速铁路桥梁设计关键技术之一，目前对格栅式地下连续墙桥梁基础的流降计算还未见报道。基于格栅式地下连续墙基础的形式和承载特性，借鉴矩形承台群桩基础沉降计算方法，提出了一种基于等效作用的分层总和法。为了验证这种方法的合理性，通过数值模拟建模计算基础沉降，并将数值计算结果与理论计算结果对比，可以得到两者的比值范围在0.64~0.78，本文推荐取0.7作为调整系数。与地下连续墙现场静载试验成果进行了对比分析，结果表明：按系数0.7调整后的沉降计算值与实测值十分接近，说明基于等效作用分层总和法的格栅式地下连续墙基础沉降计算方法是合理的，
【关键词】桥梁工程；格栅式地下连续墙；基础；沉降；分层总和法；调整系数
［中图分类号］TU753;U443.1
【文献标识码］A
[文章编号】1002-8498(2015)15-0105-06
StudyonBridgeFoundationSettlementCalculationof
LatticeShapedDiaphragmWalls
Wen Hua', Luo Xin', He Mingjin?
(1. School of Civil Engineering and Architecture, Southeesr Uniwersity and Technology, Mianyang,
Sichuan621000, China; 2.The Urban and Rural Construction Committee of Chengdu,
Chengdu, Sichuan 610094, China)
ee foundation. For high speed railway bridge foundation, the settlement control has become one of the key technologies. However, the lattice shaped diaphragm walls of bridge foundation settlement calculation has not been reported at present. According to the calculated concrete form of lattice wall foundation, basing on the standard calculation formula for rectangular sedimentation of group piles and pile caps, a layered summation method based on equivalent effect has been proposed. In order to verify the rationality of this method, the numerical simulation modeling calculation is adopted to calculate the foundation settlement, and the results of numerical simulation method and the theoretical calculation method are contrasted. The ratio range is from 0.64 to 0.78. So this paper recommends using 0.7 as adjustment coefficient. Compared with the scene of the lattice shaped diaphragm walls, the calculation results show that the coefficient of O. 7 after the adjustment settlement calculated values are very close to measured values. It shows that foundation settlement calculation method of lattice shaped diaphragm walls based on equivalent layered summation method is reasonable.
Key words: bridges; lattice shaped diaphragm walls; foundation; settlement; stratified summation method; adjustment coefficient
0
引言
高速铁路是现代化铁路的重要标志，集中体现*国家自然科学基金项目（51108393）；国家自然科学基金项目(41372292)
【作者简介］文华，博士，副教授，E-mail：wenhual89@qq.com【收稿日期］2014-04-22
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了当代高新技术的发展成果，代表着当今世界铁路的发展方向。我国《中长期铁路网规划》1]提出：到 2020年，中国铁路运营里程达到12万km以上，其中，高速铁路营运里程达1.6万km以上。在高速铁路中，桥梁的总长在线路总长度中占有较大的比重，在部分路段，桥梁总长甚至占线路总长的80%