文章摘要
杨凯旋, 侯天顺, 王 琪, 骆亚生.剪切速率对EPS颗粒混合轻量土抗剪强度的影响规律研究Journal of Water Resources and Water Engineering[J].,2022,33(5):200-207
剪切速率对EPS颗粒混合轻量土抗剪强度的影响规律研究
Influence laws of shear rate on shear strength of EPS beads light weight soil
  
DOI:10.11705/j.issn.1672-643X.2022.05.25
中文关键词: EPS颗粒轻量土  抗剪强度  剪切速率  黏聚力  内摩擦角
英文关键词: EPS beads light weight soil  shear strength  shear rate  cohesion  internal friction angle
基金项目:国家自然科学基金项目(51509211);中国博士后基金项目(2016M602863);陕西省留学人员科技活动择优资助项目(2018031); 陕西省自然科学基础研究计划引汉济渭联合基金项目(2021JLM-51);西安市岩土与地下工程重点实验室开放基金项目(XKLGUEKF21-02)
Author NameAffiliation
YANG Kaixuan1,2, HOU Tianshun1,2, WANG Qi3, LUO Yasheng2 (1.西安科技大学 西安市岩土与地下工程重点实验室 陕西 西安 710054 2.西北农林科技大学 水利与建筑工程学院陕西 杨凌 712100 3.陕西省引汉济渭工程建设有限公司 陕西 西安 710011) 
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中文摘要:
      为了确定剪切速率对EPS颗粒混合轻量土抗剪强度的影响,通过直剪试验研究了素土和不同配比轻量土在剪切速率为0.02,0.1,0.2,0.8,2.4 mm/min时的抗剪强度特性。试验结果表明:轻量土的剪应力-剪切位移关系曲线中存在硬化型和软化型两种形态,主要受EPS颗粒掺入比、水泥掺入比、法向应力的控制,素土的剪应力-剪切位移关系曲线形态为硬化型。剪切速率越大,试样达到破坏或稳定阶段历时越短。不同剪切速率下,轻量土的抗剪强度包线多为折线型,与传统结构性土体包线类似。作为一种结构性土体,配比对轻量土抗剪强度的影响是决定性的,抗剪强度、黏聚力和内摩擦角随水泥掺入比的增大、EPS颗粒掺入比的减小而增大。剪切速率对轻量土抗剪强度、黏聚力和内摩擦角影响较小,对素土影响较大。随着剪切速率增大,轻量土抗剪强度、黏聚力和内摩擦角变化幅度较小,无显著变化规律,素土抗剪强度、黏聚力和内摩擦角逐渐减小。
英文摘要:
      In order to clarify the influence of shear rate on shear strength of expanded polystyrene (EPS) beads light weight soil, the shear strength characteristics of remolded soil and light weight soil with different mixing ratios at shear rates of 0.02, 0.1, 0.2, 0.8 and 2.4 mm/min are studied by direct shear tests. The results show that there are two types of relation curves between shear stress and shear displacement for light weight soil, which are strain hardening and strain softening, and they are subject to EPS beads mixing ratio, cement mixing ratio and normal stress. The type of shear stress-shear displacement relation curves of remolded soil is strain hardening. The higher the shear rate, the less time it takes for the samples to reach shear failure or plastic flow stage. Under different shear rates, the shear strength envelopes of light weight soil are mostly broken line type, which are similar to those of the conventional structural soil. Mixing ratio has a decisive influence on the shear strength of EPS beads light weight soil, because it is also a kind of structural soil. Its shear strength, cohesion and internal friction angle increase with the increase of cement mixing ratio and the decrease of EPS beads mixing ratio. The shear rate has little effect on the shear strength, cohesion and internal friction angle of the light weight soil, but has a great influence on the remolded soil. With the increase of shear rate, the shear strength, cohesion and internal friction angle of the light weight soil only change slightly, and there are no significant change laws; whereas those of the remolded soil decrease gradually.
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