地鐵荷載下隧道周圍粉性土變形的影響因素
發(fā)布時間：2018-11-01 11:42
【摘要】：針對地鐵循環(huán)荷載作用下飽和粉性土的變形特性,對上海地鐵10號線國權(quán)路站附近的飽和粉性土進行GDS(Global Digital Systems)循環(huán)三軸試驗。試驗結(jié)果表明:動應(yīng)力幅值和固結(jié)比一定,累積塑性應(yīng)變隨振動頻率的增大而變小;固結(jié)比和振動頻率一定時,累積塑性應(yīng)變隨動應(yīng)力幅值的增大而增大;動應(yīng)力幅值和振動頻率一定時,累積塑性應(yīng)變隨固結(jié)比的增大而增大。通過正交表L_8(2~7)進行安排試驗,同時借助編碼技術(shù)對變量進行分析,得到隧道軸向變形的回歸方程,并考慮動應(yīng)力幅值、固結(jié)比和振動頻率等因素對回歸方程顯著性和失擬性進行檢驗。研究結(jié)果表明:該方程是可信的,影響地鐵隧道軸線變形的主要因素是動應(yīng)力幅值,其次是頻率和固結(jié)比。研究成果對地鐵隧道設(shè)計具有參考價值。
[Abstract]:According to the deformation characteristics of saturated silt under cyclic loading of subway, the saturated silt near Guoquan Road Station of Shanghai Metro Line 10 was tested by GDS (Global Digital Systems) cyclic triaxial test. The experimental results show that the cumulative plastic strain decreases with the increase of the vibration frequency, and the cumulative plastic strain increases with the increase of the amplitude of the dynamic stress when the consolidation ratio and the vibration frequency are constant. When the amplitude of dynamic stress and vibration frequency are constant, the cumulative plastic strain increases with the increase of consolidation ratio. Through orthogonal table L8 (2 / 7) to arrange the experiment, at the same time, with the help of coding technology to analyze the variables, the regression equation of tunnel axial deformation is obtained, and the amplitude of dynamic stress is taken into account. Factors such as consolidation ratio and vibration frequency are used to test the significance and unfitness of the regression equation. The results show that the equation is credible and the main factors affecting the deformation of the subway tunnel axis are the amplitude of dynamic stress followed by the frequency and consolidation ratio. The research results have reference value for subway tunnel design.
【作者單位】： 安陽工學(xué)院土木與建筑工程學(xué)院;同濟大學(xué)地下與建筑工程系;
【基金】：河南省科技計劃重點攻關(guān)資助項目(152102310204,132102310334) 河南省高校2016年重點科研資助項目(16B560001) 大學(xué)生科技創(chuàng)新資助項目
【分類號】：U231.1;U452.11
本文編號：2303819
[Abstract]:According to the deformation characteristics of saturated silt under cyclic loading of subway, the saturated silt near Guoquan Road Station of Shanghai Metro Line 10 was tested by GDS (Global Digital Systems) cyclic triaxial test. The experimental results show that the cumulative plastic strain decreases with the increase of the vibration frequency, and the cumulative plastic strain increases with the increase of the amplitude of the dynamic stress when the consolidation ratio and the vibration frequency are constant. When the amplitude of dynamic stress and vibration frequency are constant, the cumulative plastic strain increases with the increase of consolidation ratio. Through orthogonal table L8 (2 / 7) to arrange the experiment, at the same time, with the help of coding technology to analyze the variables, the regression equation of tunnel axial deformation is obtained, and the amplitude of dynamic stress is taken into account. Factors such as consolidation ratio and vibration frequency are used to test the significance and unfitness of the regression equation. The results show that the equation is credible and the main factors affecting the deformation of the subway tunnel axis are the amplitude of dynamic stress followed by the frequency and consolidation ratio. The research results have reference value for subway tunnel design.
【作者單位】： 安陽工學(xué)院土木與建筑工程學(xué)院;同濟大學(xué)地下與建筑工程系;
【基金】：河南省科技計劃重點攻關(guān)資助項目(152102310204,132102310334) 河南省高校2016年重點科研資助項目(16B560001) 大學(xué)生科技創(chuàng)新資助項目
【分類號】：U231.1;U452.11
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