考虑含水率影响的红砂岩损伤统计模型
首发时间:2007-03-12
摘要:通过不同含水率条件下红砂岩的单轴压缩试验,详细分析含水率变化对强度和变形特性的影响,研究结果表明:含水率小于3%,红砂岩有较高的强度;含水率大于3%,红砂岩的强度明显降低;但含水率超过6%后,强度衰减趋势显著变缓。含水率与弹性模量及峰值强度之间呈指数函数变化,而峰值强度对应的应变随含水率变化呈线性函数变化。为了描述红砂岩随含水率不同,所反映出来的力学特性,本文运用损伤统计理论和Lemaitre应变等价性假说,推导出能反映含水率影响的红砂岩损伤统计模型。
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Statistical damage model of red sandstones with effect of water ratio considered
Abstract:By means of uniaxial compression test of red sandstones with different water ratio, effect of its water ratio on its strength characteristics or deformation behavior is analysed at length, and the study’s findings indicate: if its water ratio is less than 3%, red sandstones have higher strength; if its water ratio is more than 3%, its strength will cut down evidently; but if its water ratio is more than 6%, the trend of its strength retrogression slows down; the relationship between its water ratio and elastic modulus or peak stress presents the variety trend of exponential function; the relationship between its water ratio and peak strain presents the variety trend of linear function. In order to describe mechanical properties of red sandstones under different water ratio, by means of statistical damage theory and strain-equivalence hypothesis statistical damage model of red sandstones with effect of water ratio considered is developed.
Keywords: red sandstones;water ratio;statistical damage;strain-equivalence hypothesis;damage variable
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