考虑动应力动应变关系及剪切波速相似的模型软岩配制方法
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海南大学

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P315.8

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SIMILAR MATERIAL RESEARCH ON SOFT ROCK WITH CONSIDERATION OF THE RELATIONSHIP OF DYNAMIC STRESS AND DYNAMIC STRAIN AND SIMILARITY OF SHEAR WAVE VELOCITY
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hainan university

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    摘要:

    根据模型试验的相似原理,结合某实际工程底部软岩性质,利用粘土、重晶石粉、石膏等材料,研制了一种模拟原型软岩动力特性的相似材料。通过对正交试验数据进行极差和方差分析,得到了各原材料含量对相似材料密度、初始剪切模量Gmax、参考应变γr的影响规律,并基于正交试验结果,进行了软岩相似材料的最终配比试验。试验结果表明:相似材料中重晶石粉对相似材料的密度起主要控制作用,参考应变γr值随石膏含量的增加而增大,随粘土含量的增加而减小,相似材料的初始剪切模量Gmax随着粘土含量的增加而减小,随着重晶石粉和石膏含量的增加而增大。配制的软岩相似材料可以很好的模拟原型软岩动应力-动应变关系和剪切波速特性,所提出的试验方法对振动台试验基岩相似材料配制具有指导作用。

    Abstract:

    Based on the similar principle of model tests and characteristics of soft rock in-situ, a new kind of similar material of soft rock which consists of clay, blanc fixe and gypsum is developed test to simulate dynamic characteristics of soft rock prototype. Influence laws of ingredients content on density, initial shear modulus Gmax and reference strain γr are achieved via variance and range analysis method, and based on the results, a ultimate proportioning test is conducted. The test results indicate that the proportion of blanc fixe imposes primary effect of density of similar material. Reference strain γr increases as the content of gypsum increases and decreases as the content of clay increases. Initial shear modulus Gmax of similar material decreases as the proportion of clay increases, while increases as the proportion of blanc fixe or gypsum increases. The relationship between dynamic stress and dynamic strain and shear wave velocity of the similar material appears great coincidence with that of prototype, and the test method proposed is of guiding function in later compounding of soft rock similar material in shaking table test.

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  • 收稿日期:2020-12-15
  • 最后修改日期:2021-07-18
  • 录用日期:2021-07-18
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