本文選題：粉質(zhì)黏土 + 凍融��； 參考：《西北農(nóng)林科技大學(xué)學(xué)報(bào)(自然科學(xué)版)》2016年12期

【摘要】：【目的】研究?jī)鋈谧饔孟峦恋奈锢砹W(xué)性質(zhì)的變化,構(gòu)建一種同時(shí)考慮荷載效應(yīng)和凍融循環(huán)的損傷模型,為預(yù)測(cè)凍土地基反復(fù)凍融作用下的沉降變形提供理論基礎(chǔ)�！痉椒ā恳郧嗖罔F路沿線常見(jiàn)的粉質(zhì)黏土為研究對(duì)象,制備了20組同一目標(biāo)含水量(16%)和干容重(1.30g/cm3)的重塑試樣,開展了3種正壓力(100,200和300kPa)下的直接剪切試驗(yàn),剪切變形速率控制為0.8mm/min。以粉質(zhì)黏土的抗剪強(qiáng)度數(shù)據(jù)為基礎(chǔ),采用3種常用的分布函數(shù)(正態(tài)分布、對(duì)數(shù)正態(tài)分布和Weibull分布),分析了粉質(zhì)黏土的抗剪強(qiáng)度分布特征。之后基于Weibull概率密度函數(shù)和Lemaitre等效應(yīng)力原理,推導(dǎo)出三維應(yīng)力條件下凍土的本構(gòu)關(guān)系;采用Drucker-Prager強(qiáng)度準(zhǔn)則反映荷載所致土結(jié)構(gòu)損傷,并選取凍融數(shù)次后彈性模量描述凍融循環(huán)所致結(jié)構(gòu)損傷,最后提出了一種同時(shí)考慮凍融作用和荷載效應(yīng)的損傷變量,并嵌入凍土損傷本構(gòu)關(guān)系,構(gòu)建了損傷模型。采用凍融試驗(yàn)數(shù)據(jù)和三軸剪切試驗(yàn)數(shù)據(jù),驗(yàn)證該模型的合理性�！窘Y(jié)果】相比于正態(tài)分布和對(duì)數(shù)正態(tài)分布,粉質(zhì)黏土的強(qiáng)度數(shù)據(jù)更符合Weibull分布規(guī)律,曲線吻合程度和最大偏差均最小。驗(yàn)證試驗(yàn)結(jié)果表明,構(gòu)建的損傷模型的計(jì)算結(jié)果與試驗(yàn)結(jié)果的相關(guān)系數(shù)均高于0.70,說(shuō)明該模型能夠較好地描述粉質(zhì)黏土凍融數(shù)次后的應(yīng)力應(yīng)變特征�！窘Y(jié)論】成功構(gòu)建了一種同時(shí)考慮荷載效應(yīng)和凍融作用的損傷模型,這為統(tǒng)計(jì)損傷本構(gòu)關(guān)系的研究和有效的工程應(yīng)用提供了參考依據(jù)。
[Abstract]:[objective] to study the change of physical and mechanical properties of soil under freezing and thawing, and to construct a damage model that considers both the load effect and the freeze-thaw cycle. In order to provide a theoretical basis for predicting the settlement and deformation of frozen soil foundation under repeated freezing and thawing. [methods] taking silty clay along the Qinghai-Tibet Railway as the research object, 20 groups of remolded specimens of the same target water content (16%) and dry bulk density (1.30 g / cm ~ 3) were prepared. Three direct shear tests with positive pressure of 100200 and 300 KPA were carried out, and the shear deformation rate was controlled to 0.8 mm / min. Based on the shear strength data of silty clay, the characteristics of shear strength distribution of silty clay are analyzed by using three kinds of distribution functions (normal distribution, logarithmic normal distribution and Weibull distribution). Then, based on Weibull probability density function and Lemaitre equivalent stress principle, the constitutive relation of frozen soil under three-dimensional stress condition is derived, and Drucker-Prager strength criterion is used to reflect the structural damage induced by load. The elastic modulus is selected to describe the damage caused by freeze-thaw cycle several times. Finally, a damage variable considering both freeze-thaw effect and load effect is proposed, and the damage constitutive relation of frozen soil is embedded into the damage model. The rationality of the model is verified by using freeze-thaw test data and triaxial shear test data. [results] compared with normal distribution and logarithmic normal distribution, the strength data of silty clay accord with Weibull distribution law. The degree of curve coincidence and the maximum deviation are minimum. The results of the verification test show that, The correlation coefficient between the calculated results of the damage model and the test results is higher than 0.70, which indicates that the model can well describe the stress-strain characteristics of silty clay after freezing and thawing several times. [conclusion] A new kind of damage model has been successfully constructed and considered at the same time. Damage model of load effect and freeze-thaw effect, This provides a reference for the study of statistical damage constitutive relation and effective engineering application.
【作者單位】： 西安理工大學(xué)巖土工程研究所;北京建筑大學(xué)土木與交通工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51408486;41572268) 北京市屬高等學(xué)校高層次人才引進(jìn)與培養(yǎng)計(jì)劃項(xiàng)目(CIT&TCD20150101)
【分類號(hào)】：TU442

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