【摘要】：研究目的:為研究寧波地區(qū)地鐵盾構(gòu)下穿鐵路路基的變形控制,本文首先基于寧波典型土層,通過數(shù)值模擬與Peck經(jīng)驗(yàn)公式,得出盾構(gòu)施工引起的各土層沉降槽寬度系數(shù)參考值;其次以盾構(gòu)下穿甬臺(tái)溫鐵路為研究背景,通過三維數(shù)值模擬的對比分析,研究盾構(gòu)穿越完全加固區(qū)、部分加固區(qū)以及非加固區(qū)的路基沉降變形規(guī)律。研究結(jié)論:(1)寧波典型土層可歸納為淤泥質(zhì)土、黏性土、粉土及砂性土三類,盾構(gòu)施工擾動(dòng)引起的K值及沉降槽寬度在三類土中依次減小,最大沉降值依次增加;(2)通過線形回歸擬合,首次提出了土層擾動(dòng)的初始敏感因子和深度敏感因子,隨著區(qū)間埋深的增加,初始敏感因子作用逐漸減弱,深度敏感因子的作用逐漸增強(qiáng),當(dāng)埋深足夠大時(shí),地面變形趨于一致;(3)盾構(gòu)下穿既有加固的鐵路路基時(shí),應(yīng)避免穿越半加固區(qū),在完全加固區(qū)與非加固區(qū),盾構(gòu)下穿引起的路基變形均隨埋深的增加逐漸減小,但非加固區(qū)內(nèi)沉降曲線趨于平緩;(4)本研究成果對軟土地區(qū)盾構(gòu)下穿鐵路的方案優(yōu)化和安全施工具有借鑒意義。
[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.
【作者單位】： 鐵道第三勘察設(shè)計(jì)院集團(tuán)有限公司;
【分類號(hào)】：U231.3;U455.43

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