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

发布时间：2018-02-16 09:45

本文关键词： 表观弹性模量钙质中-细砂岩三角波卸载段滞后时间段　出处：《岩土力学》2014年S1期 　论文类型：期刊论文

【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。
[Abstract]:Aiming at the deficiency of the research on the mechanical response of rock mass under cyclic loading at present, taking the calcareous medium fine sandstone in Yichang area as the research object and the RMT-150C geotechnical mechanics test system as the test platform, In this paper, the model of prediction rate of deformation rate in unload section of triangular wave of millisecond is studied. The unloading process is divided into undelayed time period and lag time period, and the discriminant basis of each segment is given. The relevant parameters are put forward, the influence of lag time period is quantitatively pointed out, and the prediction model of lag time period is given. The concept of apparent elastic modulus is put forward in non-lag time period, and the analysis of test data shows that there is no loading failure. The apparent modulus of elasticity and the instantaneous vertical force always keep linear relationship. On this basis, a model of prediction rate of deformation rate in the unloaded period of triangular wave is established, because the loading instrument can not accurately input the triangular wave. The predicted deformation rate and stress-strain curves of the model are in good agreement with the measured values, which shows the rationality of the proposed model.
【作者单位】：三峡大学土木与建筑学院;三峡大学三峡库区地质灾害教育部重点实验室;
【基金】：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)
【分类号】：TU45

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