大面积深基坑工程对高速铁路的影响性分析

发布时间：2018-04-01 23:25

本文选题：大面积　切入点：深基坑　出处：《铁道工程学报》2017年04期

【摘要】：研究目的:本文以某大面积深基坑为工程背景,该基坑邻近既有高速铁路桥梁及路基段,为确保施工期间铁路运营的安全性、降低施工风险,文中依据现行规范建立合理的高速铁路安全评估标准,经有限元模拟,分别对高速铁路路基及桥梁的沉降、相邻桥墩差异沉降、横向水平变形、纵向水平变形、轨道平顺性以及桥梁基础结构安全性等进行计算分析并给出合理的评价,从而确保基坑工程施工过程中高速铁路运营的安全性。研究结论:(1)高速铁路路基、桥梁叠加初始设计值后,各施工阶段的累积沉降值满足规范中15 mm、20 mm的限值要求;(2)高速铁路桥梁叠加初始设计值后的累积差异沉降满足规范中4 mm的限值要求;(3)叠加初始设计值后,各施工阶段横向水平变形均小于规范限值15.75 mm,纵向水平变形均小于规范限值28.06 mm;(4)在整个施工过程中,正线桥梁单桩承载力值均满足单桩容许承载力要求;(5)该研究成果可为邻近高速铁路的深基坑开挖等类似工程领域提供借鉴。
[Abstract]:Research purpose: this paper takes a large area deep foundation pit as the engineering background, the foundation pit is adjacent to the existing high-speed railway bridge and subgrade section, in order to ensure the safety of railway operation during construction, reduce the construction risk, In this paper, a reasonable safety evaluation standard for high speed railway is established according to the current code. By finite element simulation, the settlement of subgrade and bridge, differential settlement of adjacent piers, lateral horizontal deformation and longitudinal horizontal deformation are calculated, respectively. In order to ensure the safety of high-speed railway operation during foundation pit construction, the track ride comfort and the safety of bridge foundation structure are calculated and analyzed, and the research conclusion is: 1) the subgrade of high-speed railway. After the bridge is superimposed with the initial design value, The cumulative settlement value of each construction stage meets the limit requirement of 15mm / 20mm in the code) the cumulative differential settlement after the superposition of the initial design value of the high-speed railway bridge meets the requirement of the limit value of the code (4mm)) after the initial design value is superimposed, the cumulative differential settlement meets the requirement of the 4mm limit in the code. The transverse horizontal deformation of each construction stage is less than the standard limit value of 15.75 mm, and the longitudinal horizontal deformation is less than the standard limit value of 28.06 mm / / 4) during the whole construction process, The value of single pile bearing capacity of main line bridge meets the requirement of single pile allowable bearing capacity. The research results can be used for reference in similar engineering fields such as deep foundation pit excavation of adjacent high-speed railway.
【作者单位】：铁道第三勘察设计院集团有限公司;
【分类号】：TU753;U238

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