岩土力学 ›› 2019, Vol. 40 ›› Issue (9): 3618-3624.doi: 10.16285/j.rsm.2018.1023

• 岩土工程研究 • 上一篇    下一篇

压重顶进框构下穿高铁引起桥墩变形及控制技术

李悄,孟繁增,牛远志   

  1. 中国铁路设计集团有限公司,天津 300308
  • 收稿日期:2018-06-12 出版日期:2019-09-10 发布日期:2019-09-08
  • 作者简介:李悄,男,1982年生,硕士,高级工程师,主要从事桥梁设计及岩土工程方向的研究。
  • 基金资助:
    中国铁路北京局科技研究开发课题(No.2018CG24);中国铁路设计集团有限公司科技开发课题(No.721678)

Bridge pier deformation and control technology of jacking framed bridge with loading under crossing high speed railway

LI Qiao, MENG Fan-zeng, NIU Yuan-zhi   

  1. China Railway Design Corporation, Tianjin 300308, China
  • Received:2018-06-12 Online:2019-09-10 Published:2019-09-08
  • Supported by:
    This work was supported by the Research and Development Project of Beijing Bureau Group Co. of China Railway(2018CG24) and the Science and Technology Development Project of China Railway Design Corporation(721678).

摘要: 以某高速公路下穿京沪高铁工程为例,提出一种基于“卸载?加载平衡”理念的压重顶进框构方案,并对高铁桥墩变形及控制技术进行研究。结果表明,高速公路在高铁桥下开挖10 m深,开挖体量近10万方。采用压重顶进框构方案,施工中边顶进、边监测、边通过框顶堆土、桥下堆土、框内留土等措施加载压重,可有效控制高铁的隆起变形。在通车运营3个月后,高铁相邻桥墩累计最大差异沉降为2.7 mm,距离规范限值留有46%的余量,满足规范要求。轨检表明,无砟轨道平顺性满足运营要求。对比分析表明,数值模型中粉质黏土压缩模量可采用P0~P0 + 100 kPa(P0为土体自重应力)应力区间对应的模量值,卸载模量可取为压缩模量的3~5倍。

关键词: 压重顶进框构, 下穿高铁, 监测, 变形控制

Abstract: In this study, a scheme of jacking framed bridge with loading was proposed based on the concept of unload-load balance. Taking a highway under Beijing-Shanghai high-speed railway as an example, the deformation and control technology of its piers were also studied. The results show that the highway is excavated at a depth of 10 m under the high-speed railway bridge, and the excavation volume is nearly 100, 000 square meters. The uplift deformation of the high-speed railway is effectively controlled by adopting the scheme of the jacking framed bridge with loading, in which the monitoring and loading measures of the soil heap on the top of the framed bridge, under the bridge and in the framed bridge are carried out. After three months of operation, the cumulative maximum differential settlement of adjacent piers is 2.7 mm, which meet specifications with a margin of 46%. Rail inspections reveal that the regularity of ballastless track satisfies operational requirements. Through comparative analysis, the compressive modulus of silty clay in the numerical model can be determined under the stress state of experimental P0 - P0 + 100 kPa (P0 is the soil self-weight stress), and the unloading modulus can be 3?5 times of the compressive modulus.

Key words: jacking framed bridge with loading, under high-speed railway, monitoring, deformation control

中图分类号: 

  • TU 433
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