西北水电Issue(2)：33-37,5.DOI:10.3969/j.issn.1006-2610.2025.02.006
分层压实方式对砂砾石料渗透特性影响试验研究
Experimental Study on the Influence of Layered Compaction Method on the Seepage Characteristics of Sandy Gravel Materials
摘要
Abstract
The particles of sandy gravel materials are prone to separation.With the increase of the excitation force and self-vibration fre-quency of heavy compaction machinery,the sandy gravel materials have a high degree of compactness after layered compaction.However,it may cause the fine particles of the sandy gravel materials to float upward,further reducing its erosion resistance and seepage stability,and af-fecting the seepage safety of the dam.In order to analyze the influence law of the layered compaction method on the seepage characteristics of sand and gravel materials,relying on the Dashi Gorge Project,an on-site seepage stratification test of sandy gravel materials after heavy compaction was carried out,and it was compared with the conventional indoor seepage test and the large-scale seepage test.The influence of the layered compaction method and the test method on the seepage characteristics of sandy gravel materials was analyzed,and the seepage stratification characteristics of sandy gravel materials,the mechanism of fine particle floating upward and the influencing factors were studied.The research shows that there is no obvious stratification phenomenon of sandy gravel materials after layered compaction in the on-site com-paction test and the conventional indoor test,while the sandy gravel materials show obvious seepage stratification characteristics after layered compaction in the large-scale indoor test,and the seepage coefficient is one order of magnitude smaller than the results of the on-site seepage test and the conventional test.The mechanism and main influencing factors of the floating upward of fine particles in sandy gravel materials are revealed.When the particle sizes of the coarse and fine particles differ greatly,the compaction thickness is too small,and the compaction frequency is too high,it may cause a large number of fine particles to float to the surface layer,and the sandy gravel materials show obvious seepage stratification characteristics.The test results can provide a basis for the drainage and filter design of the concrete face rockfill dam.关键词
砂砾石料/分层压实/细颗粒上浮/影响因素Key words
Sandy gravel materials/Layered compaction/Floating upward of fine particles/Influencing factors分类
土木建筑引用本文复制引用
宋晓建,邓成进,凌华..分层压实方式对砂砾石料渗透特性影响试验研究[J].西北水电,2025,(2):33-37,5.基金项目
国家重点研发计划项目(2024YFF1700702) （2024YFF1700702）
国家自然科学基金项目(52350393) （52350393）
