采矿与安全工程学报Issue(4)：566-572,7.
0.1 Hz 正弦波不同载荷峰值砂岩位移速率和能量预测
Displacement rate and energy simulation of sandstone under different peak loadings of 0.1 Hz sine wave
摘要
Abstract
In this paper, under the premise that the rule of loading rate varying with time has been known, the research results show that there presents a linear relationship between the apparent elastic modulus and the loading force under different peak loadings, in which the first-order coefficient de-clines and the constant term increases as the growth of peak loadings. This rule is determined by con-solidation degree and original clastic cement strength of rock mass. Meanwhile, the predictor formula of displacement rate in millisecond level was put forward, its rationality was confirmed by comparing the calculated displacement rate and the observed values. After comparison, it suggests that the peak points of displacement rate in loading areas all appear between 1 000 ms and 2 000 ms, which is 2 500 ms ahead of the peak time of the loading rate, while the peak points of displacement rate in unloading areas appear between 8 000 ms and 9 000 ms, which is 7 000 ms lagging behind the peak time of the unload-ing rate. It explains that the ‘peak shifting’ phenomenon exists under different peak loadings and the predictor formula can well explain and predict this phenomenon. According to the derivation formula, the energy absorption statistics of rock samples were further carried out, which suggests that the pre-dicted millisecond level energy absorption process under different peak loadings agrees well with the measured process, and the applicability and rationality of the displacement rate predictor formula is fur-ther illustrated.关键词
载荷峰值/表观弹性模量/毫秒级/位移速率/“错峰”现象Key words
load peak value/apparent elastic modulus/millisecond level/displacement rate/“peak shifting”phenomenon分类
建筑与水利引用本文复制引用
..0.1 Hz 正弦波不同载荷峰值砂岩位移速率和能量预测[J].采矿与安全工程学报,2013,(4):566-572,7.基金项目
国家自然科学基金项目(51009083)；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项目(IWHR-SKL-2012221)；宜昌市科学技术研究与开发基金项目(A2012-302-03)；湖北省自然科学基金计划项目(2011CDB182)；三峡大学硕士论文培优基金项目(2012PY002) （51009083）
