摘要:
对砾石料进行了σ3不变,σ1和σ2等比例同时加载的等b试验,分别研究了中主应力对大、中、小主应变及强度的影响规律。将Mohr-Coulomb准则、Lade-Duncan准则、Matsuoka-Nakai准则和方开泽准则与砾石料的真三轴试验结果进行比较,发现Matsuoka-Nakai准则和方开泽准则反映的内摩擦角与b的关系与试验得到的规律差别较大,Lade-Duncan准则反映的规律与试验结果最接近,但数值上高估了b对内摩擦角的影响。因此,建议了一个破坏准则,推导了该准则的内摩擦角与b的关系式,并用几组真三轴试验结果进行验证,表明本文建议的准则比Lade-Duncan准则、Matsuoka-Nakai准则更准确地反映砾石料的内摩擦角与b的关系。
关键词:
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中主应力
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砾石料
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变形
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强度
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真三轴试验
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内摩擦角
Abstract:
True triaxial tests on specimens of gravel were performed,in which σ3 was invariable,and σ1,σ2 were loaded at the same time in a certain proportion b [=(σ2-σ3)/(σ1-σ3)].The influences of the intermediate principal stress on three principal strains and strength were studied separately.Mohr-Coulomb Criterion,Lade-Duncan Criterion,Matsuoka-Nakai Criterion and Fang Kai-ze Criterion were compared with the true triaxial test results of gravel.It was found that the relationships between friction angle and b reflected by Matsuoka-Nakai Criterion and Fang Kai-ze Criterion were different from those of the experimental results,and the laws reflected by Lade-Duncan Criterion were close to those of the experimental results,while it overrated the influence of b on the friction angle.Hence a criterion was proposed,and the relationship between the friction angle and b was deduced and verified using several true triaxial test results.It was indicated that the proposed criterion could reflect the relationship between the friction angle and b more accurately than Lade-Duncan Criterion and Matsuoka-Nakai Criterion.
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