不同围压作用下砂岩蠕变特性及非线性黏弹塑性模型研究

doi:10.13722/j.cnki.jrme.2017.0023

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摘要

基于不同围压作用下蠕变试验，得到重庆地区砂岩蠕变规律。研究表明：Burgers模型能有效描述砂岩的瞬时弹性变形、衰减蠕变变形与等速蠕变变形，且运用最小二乘法拟合的结果表明串联Kelvin模型对其有优化作用。根据不同围压作用下加速蠕变试验曲线特征，采用黏滞系数随时间按幂函数衰减的经验模型，并串联具有修正与优化功能的Kelvin模型，得到可体现不同围压作用下加速蠕变特征的改进黏塑性模型。将该改进模型与Burgers模型串联，可构成新的黏弹塑性模型。基于试验数据，采用1stOpt软件的全局优化算法，进行模型参数识别后得到合理的结果；对比试验曲线和理论曲线，模拟效果良好，验证了新模型的适用性。

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	刘东燕
	谢林杰
	庹晓峰
	龙丽洁

关键词 ：岩石力学, 不同围压, 岩石蠕变, 非线性蠕变模型, 参数识别

Abstract：

The creep rules of sandstone are obtained based on the creep test results under different confining pressures. The results show that，Burgers model can effectively describe the instantaneous elastic deformation，attenuation and steady creep deformation of sandstone，and the results fitting at the least square method demonstrate Kelvin model has optimization effect to Burgers model. According to the accelerating creep results under different confining pressures，a modified visco-plastic creep model is obtained by introducing the empirical model and combining Kelvin model for its optimization，and it reflects the accelerated creep characteristics accurately. By combining this modified model with Burgers model in series，a new nonlinear viscoelasto-plastic model can be put forward. Using the 1stOpt software to identify the new model parameters，the results are satisfactory. A comparison between the test and theoretical curves proves the validity of the proposed model.

Key words： rock mechanics different confining pressures rock creep nonlinear viscoelasto-plastic model parameter identification

引用本文:

刘东燕，谢林杰，庹晓峰，龙丽洁. 不同围压作用下砂岩蠕变特性及非线性黏弹塑性模型研究[J]. 岩石力学与工程学报, 2017, 36(S2): 3705-3712.
LIU Dongyan，XIE Linjie，TUO Xiaofeng，LONG Lijie. Creep properties of sandstone under different confining pressures and research on a nonlinear viscoelasto-plastic creep model. , 2017, 36(S2): 3705-3712.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.0023 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS2/3705

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