發(fā)布時(shí)間：2018-09-13 08:45

【摘要】：為研究循環(huán)荷載下土體變形特性,基于已有的分?jǐn)?shù)階黏壺構(gòu)建循環(huán)荷載下分?jǐn)?shù)階黏壺,并將其替換為西原模型黏塑性體中的常值黏壺,建立了可描述循環(huán)荷載下土體變形規(guī)律的分?jǐn)?shù)階西原模型。當(dāng)循環(huán)荷載應(yīng)力幅值大于土體臨界應(yīng)力幅值時(shí),模型為反映土體破壞型變形規(guī)律的分?jǐn)?shù)階西原模型;反之,則為反映土體穩(wěn)定型、臨界型變形規(guī)律的廣義Kelvin模型。采用應(yīng)力分解法,將循環(huán)荷載分解為一個(gè)靜力荷載和一個(gè)平均應(yīng)力值為0的循環(huán)荷載,基于流變力學(xué)理論給出了靜力作用下基于該模型的流變本構(gòu)方程,再根據(jù)黏彈性力學(xué)理論構(gòu)建了交變應(yīng)力作用下基于該模型的動(dòng)態(tài)響應(yīng)本構(gòu)方程,將已獲得的土體流變本構(gòu)方程與動(dòng)態(tài)響應(yīng)本構(gòu)方程疊加,得到新的土體本構(gòu)方程。結(jié)果表明:與既有的試驗(yàn)結(jié)果相比,基于分?jǐn)?shù)階西原模型所建立的本構(gòu)方程可較好描述循壞荷載下土體各種類型的變形特征,對(duì)土體各類型變形曲線的擬合效果較好,擬合系數(shù)均在0.90以上,且模型參數(shù)值隨循環(huán)荷載動(dòng)應(yīng)力幅值的增大而以冪函數(shù)形式減小。
[Abstract]:In order to study the deformation characteristics of soil under cyclic loading, the fractional viscosity pot under cyclic load was constructed based on the existing fractional viscosity pot, and replaced with the constant viscosity pot in the original viscoplastic body. A fractional western-order model is established to describe the deformation of soil under cyclic loading. When the amplitude of cyclic load stress is larger than the critical stress amplitude of soil, the model is a fractional western-original model which reflects the law of soil failure deformation, whereas the generalized Kelvin model reflects the law of soil stability and critical deformation. By using the stress decomposition method, the cyclic load is decomposed into a static load and a cyclic load with an average stress value of 0. Based on the rheological mechanics theory, the rheological constitutive equation based on the model is given. Based on the viscoelastic mechanics theory, the dynamic response constitutive equation based on the model is constructed, and the obtained soil rheological constitutive equation is superposed with the dynamic response constitutive equation, and a new soil constitutive equation is obtained. The results show that compared with the existing experimental results, the constitutive equation based on the fractional western-model can better describe the deformation characteristics of various types of soil under bad load, and the fitting effect of the deformation curves of each type of soil is better. The fitting coefficients are all above 0.90, and the model parameters decrease in the form of power function with the increase of dynamic stress amplitude of cyclic load.
【作者單位】： 貴州大學(xué)土木工程學(xué)院;北京科技大學(xué)土木與環(huán)境工程學(xué)院;貴州大學(xué)喀斯特環(huán)境與地質(zhì)災(zāi)害防治教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金資助(No.51608141) 貴州大學(xué)引進(jìn)人才科研項(xiàng)目(No.貴大人基合字(2015)16)~~
【分類號(hào)】：TU433

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 劉榮素;;淺議循環(huán)荷載下筋土界面力學(xué)特征[J];企業(yè)技術(shù)開(kāi)發(fā);2011年14期

2 蔣敏敏;蔡正銀;肖昭然;;動(dòng)荷載后黏性土靜力性質(zhì)研究進(jìn)展[J];水運(yùn)工程;2013年06期

3 陳存禮;馬少雄;李雷雷;蔡宗鵬;;飽和黃河岸灘粉土循環(huán)荷載后的變形強(qiáng)度特性[J];水利學(xué)報(bào);2014年07期

4 李偉紅;劉晟鋒;陳蘊(yùn)生;;組合荷載下裂隙試樣力學(xué)特性的試驗(yàn)研究[J];山西建筑;2009年02期

5 徐超;石志龍;;循環(huán)荷載特征對(duì)筋土界面剪切特性的影響試驗(yàn)[J];中國(guó)公路學(xué)報(bào);2011年03期

6 董輝;楊s，

本文編號(hào)：2240647