宁波地区地铁盾构下穿铁路路基的控制性研究

发布时间：2019-05-22 04:25

【摘要】：研究目的:为研究宁波地区地铁盾构下穿铁路路基的变形控制,本文首先基于宁波典型土层,通过数值模拟与Peck经验公式,得出盾构施工引起的各土层沉降槽宽度系数参考值;其次以盾构下穿甬台温铁路为研究背景,通过三维数值模拟的对比分析,研究盾构穿越完全加固区、部分加固区以及非加固区的路基沉降变形规律。研究结论:(1)宁波典型土层可归纳为淤泥质土、黏性土、粉土及砂性土三类,盾构施工扰动引起的K值及沉降槽宽度在三类土中依次减小,最大沉降值依次增加;(2)通过线形回归拟合,首次提出了土层扰动的初始敏感因子和深度敏感因子,随着区间埋深的增加,初始敏感因子作用逐渐减弱,深度敏感因子的作用逐渐增强,当埋深足够大时,地面变形趋于一致;(3)盾构下穿既有加固的铁路路基时,应避免穿越半加固区,在完全加固区与非加固区,盾构下穿引起的路基变形均随埋深的增加逐渐减小,但非加固区内沉降曲线趋于平缓;(4)本研究成果对软土地区盾构下穿铁路的方案优化和安全施工具有借鉴意义。
[Abstract]:The purpose of this paper is to study the deformation control of railway subgrade under shield tunneling in Ningbo area. Firstly, based on the typical soil layer of Ningbo, through numerical simulation and Peck empirical formula, the reference value of width coefficient of settlement groove of each soil layer caused by shield construction is obtained. Secondly, taking the shield tunneling through Yongtai-Wen railway as the research background, through the comparative analysis of three-dimensional numerical simulation, the settlement and deformation law of subgrade through the fully reinforced area, part of the reinforced area and the non-reinforced area of the shield is studied. The conclusions are as follows: (1) the typical soil layer of Ningbo can be divided into three types: silty soil, clay soil, silt soil and sandy soil. The K value and settlement trough width caused by shield construction disturbance decrease in turn, and the maximum settlement value increases in turn. (2) through linear regression fitting, the initial sensitive factor and depth sensitive factor of soil disturbance are put forward for the first time. With the increase of interval buried depth, the effect of initial sensitive factor is gradually weakened, and the effect of depth sensitive factor is gradually enhanced. When the buried depth is large enough, the deformation of the ground tends to be the same. (3) when the shield tunneling passes through the existing reinforced railway subgrade, it should avoid passing through the semi-reinforced area. In the complete reinforcement area and the non-reinforcement area, the deformation of the subgrade caused by the shield tunneling decreases gradually with the increase of the buried depth. However, the settlement curve in the non-reinforced area tends to be flat. (4) the results of this study can be used for reference in the scheme optimization and safety construction of shield crossing railway in soft soil area.
【作者单位】： 铁道第三勘察设计院集团有限公司;
【分类号】：U231.3;U455.43

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