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浸水条件下前期荷载对砂岩颗粒料压缩-回弹特性影响

Effect of compression-springback properties of sandstone particles material under the prophase load on the condition of soaking
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摘要 压缩-回弹特性是地基处理及基坑工程中沉降及回填变形分析的重要参考依据。由于砂岩颗粒料属颗粒类材料,浸水时前期荷载及干密度影响其压缩-回弹特性;采用应力控制式三联杠杆(高压)固结仪,探究浸水24 h后前期荷载及干密度对砂岩颗粒料压缩-回弹特性影响。结果表明:干密度相同时,随着前期荷载增加,砂岩颗粒料压缩特性逐渐减小;在相同卸荷比条件下,回弹率逐渐降低;前期荷载相同时,砂岩颗粒料压缩特性与回弹特性均随干密度增大而逐渐减小;砂岩颗粒料塑性应变随前期荷载增加、干密度增大而逐渐减小。 Compression-springback property is a important reference on the foundation treatment and foundation pit engineering in the analysis of subsidence and deformation of backfill. As the sandstone particles material is a granular material, the prophase load and dry density influences its compression-springback characteristic on the condition of soaking; using the stress control trigeminy( high pressure) consolidation apparatus, the compression-springback characteristic is explored under the prophase load or the dry density after soaking 24 h. The results show that, at the same dry density, with the increase of prophase load, the compression properties of the sandstone particles material decrease gradually; under the condition of same unloading ratio, springback rate gradually decreased. At the same prophase load, with the increase of dry density, the compression-springback properties of the sandstone particles material decrease gradually.With the increase of prophase load and dry density, the plastic strain of the sandstone particles material decreases gradually.
出处 《水运工程》 北大核心 2017年第3期162-168,共7页 Port & Waterway Engineering
基金 重庆市基础与前沿研究计划项目(cstc2014jcyj A20009)
关键词 浸水时间 前期荷载 干密度 砂岩颗粒料 immersion time prophase load dry density sandstone particles material
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