| 云母石英片岩蠕变模型参数选择研究 |
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| 引用本文： | 陈文玲,赵法锁.云母石英片岩蠕变模型参数选择研究[J].西安地质学院学报,2010(2):200-204. |
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| 作者姓名： | 陈文玲 赵法锁 |
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| 作者单位： | [1]长安大学地质工程与测绘学院,陕西西安710054 [2]长安大学西部矿产资源与地质工程教育部重点实验室,陕西西安710054 [3]长安大学岩土工程开放研究国土资源部重点实验室,陕西西安710054 |
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| 基金项目： | 国家自然科学基金项目（40872185） |
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| 摘 要： | 根据三轴蠕变试验曲线的特点,建立了云母石英片岩七元件线性黏弹塑性蠕变模型,采用最小二乘法对蠕变柔量时间曲线和应变时间蠕变曲线进行拟合确定蠕变模型参数,讨论了确定蠕变模型参数的影响因素及参数的合理性与可用性。结果表明：由于受到分级加载次数、初次加载应力值和加载时间的影响,两种曲线拟合确定的参数各不相同;云母石英片岩蠕变模型的非线性较明显;蠕变柔量时间曲线拟合确定的参数不予采用,应变时间蠕变曲线拟合确定的参数在各级应力水平下变化规律不明显;采用某种单一方法确定蠕变模型参数不够全面,建议采用综合辨识法,这样才能保证岩土工程中蠕变数值分析结果的正确合理性以及施工设计的安全可靠性。
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| 关 键 词： | 线性 黏弹 塑性 蠕变模型 参数 综合辨识法 |
Study on Choice of Creep Model Parameters for Mica-quartzose Schist |
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| Authors: | CHEN Wen-ling ZHAO Fa-suo |
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| Institution: | 1.School of Geological Engineering and Surveying,Chang＇an University,Xi＇an 710054,Shaanxi,China;2.Key Laboratory of Western Mineral Resource and Geological Engineering of Ministry of Education, Chang＇an University,Xi＇an 710054,Shaanxi,China;3.Open Research Key Laboratory of Geotechnical Engineering of Ministry of Land and Resources,Chang＇an University,Xi＇an 710054,Shaanxi,China) |
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| Abstract: | A seven-component linear viscoelastic plastic creep model of mica-quartzose schist was built according to the characteristic of triaxial creep test curve.Creep compliance-time curve and strain-time curve were fitted by means of least squares method,and then the parameters of creep model were obtained.The impact factors of obtaining parameters of creep model and the rationality and availability of those parameters were discussed.The result showed that the parameters obtained by the fitting of two curves were diverse from each other because of rating load times,primary load stress value and load time;creep model of mica-quartzose schist was significantly nonlinear;the parameters obtained by the fitting of creep compliance-time curve were not introduced,and the pattern of the parameters obtained by the fitting of strain-time curve was not significant in different stress levels;comprehensive identification method was suggested to replace any one single method which was incompletely used to obtain the parameters of creep model,and it could guarantee the rationality of the result of creep numerical analysis and the safe reliability of construction design in geotechnical engineering. |
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| Keywords: | linear viscoelastic plastic creep model parameter comprehensive identification method |
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