岩土力学Issue(z1)：63-70,8.
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
Study of prediction model for milliseconds deformation rate in triangular wave unloading segment of calcareous sandstone
摘要
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.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Key words
apparent elastic modulus/calcareous sandstone/triangular wave unloading segment/lag time segment分类
建筑与水利引用本文复制引用
刘杰,李建林,唐亮,胡静,范留军,夏俊..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[J].岩土力学,2014,(z1):63-70,8.基金项目
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）。 （）
