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剪切方式对重塑黄土残余强度的影响
王炜1,2, 骆亚生2
1.山西农业大学 城乡建设学院, 山西 太谷 030801;2.西北农林科技大学 水利与建筑工程学院, 陕西 杨凌 712100
摘要:
[目的] 探究剪切方式对重塑黄土残余强度的影响,为黄土滑坡工程评价及治理提供科学依据。[方法] 利用环剪仪对泾阳重塑黄土进行环剪试验。[结果] 重塑黄土的峰值强度及残余强度均随着有效法向应力的增加而增大。随着有效法向应力的增加,土体达到残余强度所需的剪切位移减小;重塑黄土的变形表现为受剪压缩。单级剪得到的残余强度指标值与多级剪切得到的残余强度指标值的均值相近。[结论] 剪切方式建议首选单级剪切。
关键词:  黄土  环剪试验  剪切方式  残余强度  变形
DOI:10.13961/j.cnki.stbctb.2018.06.027
分类号:
基金项目:国家自然科学基金项目“基于土体结构性变化的黄土滑坡灾变机理研究”(51178392);山西农业大学青年科技创新基金项目(2017020)
Effect of Different Ring Shear Tests on Residual Strength of Remolded Loess
WANG Wei1,2, LUO Yasheng2
1.College of Urban and Rural Construction, Shanxi Agricultural University, Taigu, Shanxi 030801, China;2.College of Water Resources and Architectural Engineering, Northwest A & F University, Yangling, Shaanxi 712100, China
Abstract:
[Objective] Exploring the influence of shearing method on the residual strength of remolded loess in order to provide a scientific basis for the evaluation and treatment of loess landslide engineering.[Methods] To explore the influence of different shear modes on peak strength, residual strength and deformation, ring shear test was carried out on Jingyang loess by ring shear apparatus.[Results] The peak strength and residual strength of remolded loess increased with the increase of effective normal stress, and the greater the effective normal stress, the easier the loess to achieve the residual strength. The deformation of remolded loess is shown as shear compression. The average value of residual strength index obtained by single-stage shear and multistage shear was close.[Conclusion] The shear method is recommended for single-stage shear.
Key words:  loess  ring-shear test  shear method  residual strength  deformation