| 新近系红层软岩流变特性试验研究 |
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| 引用本文： | 刘小伟,谌文武,张帆宇,原鹏博,韩文峰.新近系红层软岩流变特性试验研究[J].中国沙漠,2012,32(5):1268-1274. |
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| 作者姓名： | 刘小伟 谌文武 张帆宇 原鹏博 韩文峰 |
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| 作者单位： | 1.兰州大学 西部灾害与环境力学教育部重点实验室, 甘肃 兰州 730000;
2.兰州大学 土木工程与力学学院, 甘肃 兰州 730000;
3.天津城市建设学院 土木工程系, 天津 300381 |
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| 基金项目： | 兰州大学中央高校基本科研业务费专项资金，国家自然科学基金项目 |
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| 摘 要： | 流变是控制岩体稳定的主要因素之一。流变试验结果显示,新近系红层软岩蠕变和松弛曲线具有明显的三阶段变化特征。对比研究新近系粉砂质泥岩和泥质粉砂岩的流变结果,得出粉砂质泥岩较泥质粉砂岩强度低,蠕变量大,达到稳定需要的时间长。经过模型辨识,认为红层软岩流变符合伯格斯模型（Burgers model）。利用改进后的麦夸托（Marquardt）算法求取了红层软岩的流变参数。结果显示,反映岩石流变特性的两个主要指标弹性模量和黏滞系数远低于硬岩的同类指标,充分说明新近系红层软岩具有显著的流变性。获取的流变参数可用于伯格斯模型计算。
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| 关 键 词： | 红层软岩 蠕变 松弛 分级加载 伯格斯模型 |
| 收稿时间： | 2012-04-10; |
| 修稿时间： | 2012-05-11 |
Experimental Study on Rheological Properties of Neogene Red-bed Soft Rock |
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| LIU Xiao-wei,CHEN Wen-wu,ZHANG Fan-yu,YUAN Peng-bo,HAN Wen-feng.Experimental Study on Rheological Properties of Neogene Red-bed Soft Rock[J].Journal of Desert Research,2012,32(5):1268-1274. |
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| Authors: | LIU Xiao-wei CHEN Wen-wu ZHANG Fan-yu YUAN Peng-bo HAN Wen-feng |
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| Institution: | 1.Ministry of Education Key Laboratory of Mechanics on Disaster and Environment in Western China, Lanzhou University, Lanzhou 730000, China;
2.School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China;
3.Department of Civil Engineering, Tianjin College of Urban Construction, Tianjin 300381, China |
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| Abstract: | Rheological property is a major controlling factor for rock mass stability.By a set of rheological experiments,the creep and relaxation curves of Neogene red-bed soft rock are obtained,whose variation process can be classified as three change stages.Compared with argillaceous siltstone,Neogene silty mudstone has lower strength,larger creep and longer time to stabilization.Based on scientific analysis and comparative study,rheological curves of red-bed soft rock are in accord with Burgers rheological model.Using Marquardt algorithm,the rheological parameters of red-bed soft rock under different test conditions were obtained.The rheological parameters of red-bed soft rock are far lower than those of the hard rock,which indicates that Neogene argillaceous siltstone and silty mudstone have remarkable rheological property.All these parameters can be applied to characterize the rheological properties of red-bed soft rock. |
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| Keywords: | red-bed soft rock creep relaxation step load Burgers model |
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