發(fā)布時間：2018-02-13 06:01

  本文關(guān)鍵詞： 重載鐵路 粗粒土 動強度 臨界動應(yīng)力 累積應(yīng)變　出處：《巖土力學(xué)》2016年03期 　論文類型：期刊論文

【摘要】：重載鐵路路基比普通鐵路和高速鐵路要承受更大的動力荷載,路基本體的動力變形更加明顯。重載鐵路路基的核心層絕大部分為粗粒土,為了探討重載鐵路路基粗粒土填料在列車往復(fù)荷載作用下的變形和強度特性,開展了一系列大型動三軸試驗,探討了不同動應(yīng)力幅值、不同圍壓、不同含水率對粗粒土土樣累積變形的影響,分析了不同靜強度和圍壓時動強度的特點,并根據(jù)粗粒土土樣在不同圍壓和動應(yīng)力作用下的變形規(guī)律,即增大圍壓或減小動應(yīng)力有助于增強土體穩(wěn)定,提出了基于累積變形發(fā)展趨勢的路基粗粒土變形穩(wěn)定界限狀態(tài)和判別準(zhǔn)則,并給出了判別準(zhǔn)則參數(shù)。研究結(jié)果對重載鐵路路基的動力變形穩(wěn)定性評價和基于動力變形控制的路基設(shè)計具有參考價值。
[Abstract]:The dynamic deformation of the embankment is more obvious than that of the ordinary railway and high-speed railway. The core layer of the heavy-duty railway subgrade is mostly coarse grained soil. In order to study the deformation and strength characteristics of coarse grained soil filler in heavy duty railway roadbed under the action of train reciprocating load, a series of large-scale dynamic triaxial tests were carried out, and different dynamic stress amplitudes and confining pressures were discussed. The effect of different moisture content on the cumulative deformation of coarse grained soil samples is analyzed. The characteristics of dynamic strength under different static strength and confining pressure are analyzed, and according to the deformation rules of coarse grained soil samples under different confining pressures and dynamic stresses, That is, increasing confining pressure or decreasing dynamic stress is helpful to enhance soil stability. Based on the development trend of cumulative deformation, the limit state and criterion of roadbed coarse grained soil deformation stability are proposed. The research results are valuable for the evaluation of dynamic deformation stability of heavy-duty railway subgrade and the design of roadbed based on dynamic deformation control.
【作者單位】： 中南大學(xué)土木工程學(xué)院;高速鐵路建造技術(shù)國家工程實驗室;
【基金】：國家自然科學(xué)基金項目(No.U1361204,No.51408613) 中國神華集團科研專項(No.SHGF-14-55) 中國鐵路總公司(原鐵道部)重大課題(No.2013G004-A-2)~~
【分類號】：U213.1;TU411.8

【參考文獻】

相關(guān)期刊論文 前2條

1 蔡英，曹新文;重復(fù)加載下路基填土的臨界動應(yīng)力和永久變形初探[J];西南交通大學(xué)學(xué)報;1996年01期

2 冷伍明;劉文R，

本文編號：1507479