本文選題：巖石力學(xué)　切入點(diǎn)：凍融循環(huán)作用　出處：《巖石力學(xué)與工程學(xué)報(bào)》2017年02期 　論文類型：期刊論文

【摘要】：利用疲勞損傷理論來研究凍融循環(huán)條件下巖石的損傷累積在理論上是可行的。主要分析凍融疲勞損傷模型在計(jì)算自然條件下巖石凍融損傷時面臨的主要問題,包括復(fù)雜多變的自然條件下如何簡化、近似凍融循環(huán)作用,如何選取合適的物理量來計(jì)算損傷變量,及如何計(jì)算多種機(jī)制作用下巖石的凍融損傷。經(jīng)過分析認(rèn)為:研究自然條件下的晝夜循環(huán)和年度循環(huán)對人類工程活動意義最大,根據(jù)巖石中飽和度的高低和巖石中未凍水遷移速率的快慢,可分別將晝夜循環(huán)和年度循環(huán)劃分并等效為高周或低周疲勞荷載;凍融循環(huán)條件下巖石孔隙率的變化可直接反映凍融損傷的特征,利用缺陷面積和殘余應(yīng)變定義的損傷變量其本質(zhì)是相同的,均可用孔隙率計(jì)算得來;建立凍融循環(huán)作用下砂巖的高周疲勞損傷模型和低周疲勞損傷模型,利用模型進(jìn)行分析表明,在計(jì)算自然條件下巖石的凍融損傷時高周疲勞荷載的作用是不可忽略的,并且低周疲勞和高周疲勞荷載的作用順序具有顯著的影響。
[Abstract]:It is feasible to use the fatigue damage theory to study the damage accumulation of rock under freeze-thaw cycle. The main problems in calculating the freeze-thaw damage of rock under natural condition are analyzed. Including how to simplify and approximate freeze-thaw cycle under complex and changeable natural conditions, how to select appropriate physical quantities to calculate damage variables, And how to calculate the freezing and thawing damage of rock under the action of many mechanisms. It is considered that the study of circadian cycle and annual cycle under natural conditions is of great significance to human engineering activities. According to the degree of saturation in rock and the speed of unfrozen water migration in rock, the circadian cycle and annual cycle can be divided into high cycle and low cycle fatigue load respectively. The change of rock porosity under freeze-thaw cycle can directly reflect the characteristics of freeze-thaw damage. The damage variable defined by defect area and residual strain is essentially the same and can be calculated by porosity. The high cycle fatigue damage model and low cycle fatigue damage model of sandstone under freeze-thaw cycle are established. The analysis shows that the effect of high cycle fatigue load can not be ignored in the calculation of freeze-thaw damage of rock under natural conditions. And the sequence of low cycle fatigue and high cycle fatigue load has a significant effect.
【作者單位】： 西安科技大學(xué)建筑與土木工程學(xué)院;中國地質(zhì)大學(xué)工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(41302228) 中國博士后科學(xué)基金資助項(xiàng)目(2013M532070,2014T70931)~~
【分類號】：TU45

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 劉泉聲;黃詩冰;康永水;黃興;;巖體凍融疲勞損傷模型與評價指標(biāo)研究[J];巖石力學(xué)與工程學(xué)報(bào);2015年06期

2 聞磊;李夕兵;尹彥波;高栗;;凍融循環(huán)作用下花崗斑巖和灰?guī)r物理力學(xué)性質(zhì)對比分析及應(yīng)用研究[J];冰川凍土;2014年03期

3 李杰林;周科平;張亞民;許玉娟;;基于核磁共振技術(shù)的巖石孔隙結(jié)構(gòu)凍融損傷試驗(yàn)研究[J];巖石力學(xué)與工程學(xué)報(bào);2012年06期

4 周科平;李杰林;許玉娟;張亞民;楊培強(qiáng);陳路平;;凍融循環(huán)條件下巖石核磁共振特性的試驗(yàn)研究[J];巖石力學(xué)與工程學(xué)報(bào);2012年04期

5 張慧梅;楊更社;;巖石凍融力學(xué)實(shí)驗(yàn)及損傷擴(kuò)展特性[J];中國礦業(yè)大學(xué)學(xué)報(bào);2011年01期

6 項(xiàng)偉;劉s，

本文編號：1620726