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| 碾压混凝土原位抗剪试验及其抗剪强度破坏准则研究 |
| Study on in-situ shear test of roller-compacted concrete and its shear strength failure criterion |
| 投稿时间：2023-08-07 修订日期：2023-09-21 |
| DOI： |
| 中文关键词: 碾压混凝土 原位抗剪 层间间隔 全曲线模型 八面体强度 |
| 英文关键词:Roller-compacted concrete In situ shear resistance Interlayer spacing Full curve model Octahedral strength |
| 基金项目:国家自然科学(51879217)； |
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| 中文摘要: |
| 碾压混凝土(RCC)原位抗剪试验可以充分体现实际工程中碾压混凝土的层间结合特性。本文利用原位抗剪试验设备对4种工况下碾压混凝土试件进行现场原位试验,对比不同法向压应力和层间间隔时间对试件抗剪强度的影响。结果表明：含层面碾压混凝土试块的抗剪强度随着法向正应力的增大而增大；碾压混凝土抗剪强度随层间间隔时间的增加而减小；在所有试块中,层间间隔8h且法向正应力为3MPa时,碾压混凝土抗剪断强度达到最高值,且相较层间间隔72h情况下,抗剪断强度增大0.83MPa。选择Weibull-过镇海全曲线模型对荷载-位移曲线进行拟合,全曲线模型与实测曲线吻合较好；在八面体强度理论的基础上,提出考虑层间间隔时间的强度破坏准则。研究结果可以为碾压混凝土原位抗剪本构模型及破坏准则的建立提供必要的理论依据。 |
| 英文摘要: |
| The in-situ shear test of roller-compacted concrete is a reliable method for evaluating the shear strength characteristics of this type of concrete in real-world engineering applications. This study conducted in-situ tests on roller-compacted concrete specimens under four different working conditions using specialized equipment for shear testing. The aim was to compare the shear characteristics of the specimens under varying levels of compressive stress and interlaminar interval time. The test results were used to generate load-displacement curves, which were then fitted using the Weibull-GUO Zhenhai full curve model. The ultimate shear strength was determined using the octahedral strength failure criterion. The findings indicate that the shear strength of the concrete test blocks with layers increases as the normal positive stress increases. Conversely, the shear strength of compacted concrete decreases with an increase in the interlayer interval. Among all the test blocks, the highest shear strength of roller-compacted concrete was observed when the interlayer interval was 8 hours and the normal stress was 3 MPa. This shear strength value was 0.83 MPa higher than that observed at an interlayer interval of 72 hours. The load-displacement curve was well-fitted by the Weibull-GUO Zhenhai full curve model, demonstrating good agreement between the model and the measured curve. Additionally, a strength failure criterion considering the interval time between layers was proposed based on the octahedral strength theory. These results provide a necessary theoretical foundation for determining the in-situ shear constitutive model and failure criterion of roller-compacted concrete. |
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