›› 2014, Vol. 35 ›› Issue (S1): 63-70.

• 基础理论与实验研究 • 上一篇    下一篇

三角波卸载段作用下钙质砂岩毫秒量级变形速率预测模型研究

刘 杰1,李建林1,2,唐 亮1,胡 静1,范留军1,夏 俊1   

  1. 1. 三峡大学 土木与建筑学院,湖北 宜昌 443002;2. 三峡大学 三峡库区地质灾害教育部重点实验室,湖北 宜昌 443002
  • 收稿日期:2014-01-25 出版日期:2014-06-10 发布日期:2014-06-20
  • 作者简介:刘杰,男,1979年生,博士,副教授,主要从事岩土工程和水工结构方面的研究工作
  • 基金资助:

    国家重点基础研究发展计划(973)前期研究专项课题资助(No. 2012CB426502);国家自然科学基金资助(No. 51009083, No. 51079077, No. 51109120);湖北省自然科学基金计划项目资助(No. 2011CDB182);中国水利水电科学研究院流域水循环模拟与调控国家重点实验室开放研究基金资助(No. IWHR-SKL-2012221);宜昌市科学技术研究与开发项目资助(No. A2012-302-03)

Study of prediction model for milliseconds deformation rate in triangular wave unloading segment of calcareous sandstone

LIU Jie1,LI Jian-lin1,2,TANG Liang1,HU Jing1,FAN Liu-jun1,XIA Jun1   

  1. 1. College of Civil Engineering and Architecture, China Three Gorges University, Yichang,Hubei 443002, China; 2. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, China Three Gorges University, Yichang, Hubei 443002, China
  • Received:2014-01-25 Online:2014-06-10 Published:2014-06-20

摘要: 针对现阶段岩体循环加载下力学响应研究中的不足之处,以宜昌地区钙质中-细砂岩为研究对象和以RMT-150C岩土力学试验系统为试验平台,开展了毫秒(ms)量级三角波卸载段变形速率预测率模型研究。将卸载过程分为非滞后时间段和滞后时间段,给出各段判别依据,提出所需相关参数。定量指出滞后时间段带来的影响,给出滞后时间段的预测模型。在非滞后时间段提出表观弹性模量的概念,试验数据分析表明未出现加载破坏前,岩样表观弹性模量和即时垂向力始终保持线性关系。在该基础上建立三角波卸载段非滞后时间段的变形速率预测率模型模型,由于加载仪器不能精确输入三角波,将加载速率平均值修正和载荷速率中加入常数项修正后,该模型的预测变形速率和应力-应变曲线与实测值精确吻合,表明所建模型的合理性。

关键词: 表观弹性模量, 钙质中-细砂岩, 三角波卸载段, 滞后时间段

Abstract: In light of that the, studies of mechanical response of rock under cyclic loading need to be more perfected, taking Yichang sandstone as the research object and using the geotechnical testing system RMT-150C for the test platform, the research on the prediction model of deformation rate in triangular wave unloading segment with the magnitude of ms., is carried out. Unloading process is divided into non-lag and lag time segment; and the required parameters and discrimination basis for each segment is given. Effect of lag time segment is pointed out quantitatively; and the prediction mode in time lag segment is also given. Then the concept of the apparent modulus of elasticity in the lag non-lag time segment is proposed; analysis of the test data shows linear relationship between the apparent elastic modulus of the rock sample before the sample was damaged under loading. On this basis, a prediction model of deformation rate by triangular wave unloading in non-lag time segment is established. As the test platform can not be accurately input triangular wave, after the average loading rate and loading rate is corrected by adding corrected constant term, the predicted deformation rate and stress-strain curves of the model are coincide precisely with the measured values, so as to indicate the rationality of the model.

Key words: apparent elastic modulus, calcareous sandstone, triangular wave unloading segment, lag time segment

中图分类号: 

  • TU 452
[1] 刘 杰,胡 静,李建林,唐 亮,范留军. 动载作用下砂岩变形速率及能量毫秒级模拟研究[J]. , 2014, 35(12): 3403-3414.
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