煤田地质与勘探2019，Vol.47Issue(1)：144-148,5.DOI:10.3969/j.issn.1001-1986.2019.01.022
不排水条件下钙质砂声发射试验研究
Acoustic emission test of calcareous sands under undrained condition
摘要
Abstract
Calcareous sand acoustic emission was tested under undrained condition to study the law of acoustic emission with different confining pressure, shear rate, initial void ratio and grading. The results showed that when the confining pressure was lower than 400 kPa, calcareous sand acoustic emission event rate increased with confining pressure. But when the confining pressure was increased to 800 kPa, calcareous sand acoustic emission event rate decreased. The test of calcareous sand was divided into particle breakage stage and particle slip stage in low shear rate. Two stages can't be distinguished clearly as the shear rate increases. Loose and dense calcareous sands have similar acoustic emission activities which were higher than medium dense calcareous sand. When grading of calcareous sand was well, acoustic emission peak appeared at the early stage of shear failure rate. When grading calcareous sand was poor, acoustic emission rate was relatively uniform, and acoustic emission peak appeared at the end of the test.关键词
不排水条件/钙质砂/声发射Key words
undrained condition/calcareous sands/acoustic emission分类
建筑与水利引用本文复制引用
杨超,王凯,乔丽平,孟庆山,汪稔..不排水条件下钙质砂声发射试验研究[J].煤田地质与勘探,2019,47(1):144-148,5.基金项目
国家自然科学基金青年科学基金项目(41702323) （41702323）
页岩气资源利用湖南省重点实验室项目(E21719) （E21719）
广西岩土力学与工程重点实验室项目(15-KF-04) （15-KF-04）
湖南省教育厅科研项目(17C0648) （17C0648）
水能资源利用关键技术湖南省重点实验室项目(PKLHD201602) （PKLHD201602）
