基于室内试验的动态回弹模量与变形模量的比较与公式修正研究
Indoor Test-Based Comparison and Formula Correction of Dynamic Resilient and Deformation Modulus
DOI: 10.12677/OJTT.2023.125048, PDF,   
作者: 纪厚强, 冯元正, 王建立：安徽省交通控股集团有限公司，安徽 合肥；郭超宇, 方明镜：武汉理工大学土木工程与建筑学院，湖北 武汉；束冬林：安徽省高速公路试验检测科研中心有限公司，安徽 合肥
关键词: 动态回弹模量；塑性修正；模拟现场试验；细粒土路基；Resilience Modulus； Plastic Correction； Simulated Field Test； Fine-Grained Soil Subgrade
摘要: 动态回弹模量测试仪(DEMT)是在动态变形模量Evd测试仪(PFWD)与车载式落锤弯沉仪(FWD)检测原理基础上研制而成。本研究旨在探究公路路基DEMT现场检测中动态回弹模量的真实值，比较分析PFWD动态变形模量与DEMT动态回弹模量定义上以及公式计算的差异，修正采用DEMT进行动态回弹模量检测时塑性变形对结果的影响。通过定制钢模制备不同掺灰量与不同压实度的土样试件，并使用高精度游标卡尺测量DEMT测试前后试件高度差。试验结果表明，掺灰条件下，压实度越低，试件可被压缩区间越大，受到冲击荷载时产生的塑性变形越大，压实度为90%，测试回弹模量值时初始塑性变形最大，为0.0532 mm，压实度为96%时，总变形中初始塑性变形最小，为0.0201 mm。由此可见，路基土试样进行动态回弹模量测试时塑性变形在总变形中的占比随压实度的增加而减小，且同一压实度试件随回弹模量测试次数的增加塑性变形占比逐渐减小。
Abstract: The Resilience modulus Tester (DEMT) is developed based on the principles of the Dynamic De-formation Modulus Evd Tester (PFWD) and the Falling Weight Deflectometer (FWD). This study aims to explore the true values of the Resilience modulus (DEMT) in on-site testing of highway subgrade. A comparative analysis is conducted between the dynamic deformation modulus measured by PFWD and the Resilience modulus measured by DEMT. The differences in modulus definitions and formula calculations are analyzed, and the influence of plastic deformation on the results when using DEMT for Resilience modulus testing is corrected. Custom steel molds were used to prepare soil specimens with different fly ash contents and compaction degrees. The height difference of the specimens before and after DEMT testing was measured using a high-precision vernier caliper. The experimental results show that under fly ash conditions, the lower the compaction degree, the larger the compressible range of the specimen, and the greater the plastic deformation induced by the impact load. When the compaction degree is 90%, the initial plastic deformation is the largest, measuring 0.0532 mm. When the compaction degree is 96%, the initial plastic deformation is the smallest, measuring 0.0201 mm in the total deformation. Therefore, it can be observed that the proportion of plastic deformation in the total deformation during Resilience modulus testing of subgrade soil samples decreases with the increase of compaction degree. Moreover, for specimens with the same compaction degree, the proportion of plastic deformation decreases gradually with an increase in the number of rebound modulus tests.
文章引用：纪厚强, 冯元正, 郭超宇, 王建立, 束冬林, 方明镜. 基于室内试验的动态回弹模量与变形模量的比较与公式修正研究[J]. 交通技术, 2023, 12(5): 438-448. https://doi.org/10.12677/OJTT.2023.125048

参考文献

[1] 蔡玉洁, 王伟. 动态回弹模量测试仪在高速公路路基压实质量检测上的应用[J]. 科学技术创新, 2021(9): 139-140.
[2] 中华人民共和国交通运输部. 公路路基路面现场测试规程[S]. 北京: 交通部公路科学研究院, 2019.
[3] 李炳秀, 何明峰. 瞬态瑞雷面波法检测路基填筑质量的定量分析[J]. 铁道勘察, 2018, 44(4): 55-59.
[4] 张献民, 王建华. 公路工程瞬态激振无损检测技术[J]. 土木工程学报, 2003, 36(10): 105-110.
[5] 蒋宣艳. 公路工程路基压实度检测技术研究[J]. 交通世界, 2022(24): 147-149.
[6] 谭宝贵. 基于Duncan-Chang模型的静力贯入路基压实度确定方法[J]. 工程技术研究, 2018(4): 27-28.
[7] 何兆益, 吴国雄, 朱洪洲. 山区高填方土石混填路堤压实质量控制研究[J]. 公路交通科技, 2002, 19(3): 28-31.
[8] 张军辉, 胡健坤, 彭俊辉, 等. 基于人工神经网络的路基土回弹模量预估方法[J]. 中南大学学报(英文版), 2021, 28(3): 898-910.
[9] Zhao, Y., Lu, Z., Yao, H.-L., et al. (2020) Experimental Study of Dynamic Resilient Modulus of Subgrade Soils under Coupling of Freeze-Thaw Cycles and Dynamic Load. Journal of Central South University, 27, 2043-2053. [Google Scholar] [CrossRef] 
[10] 胡堃. 基于便携式落锤弯沉仪的填石路基压实质量检测分析[J]. 交通科技与管理, 2023(2): 155-157.
[11] 邱文利, 杨杰, 杨广庆. 便携式落锤弯沉仪PFWD设备检测特性研究[J]. 交通世界, 2022(22): 157-159, 166.
[12] 孙璐, 王登忠. 基于便携式落锤弯沉仪动态弯沉的路基压实度无损检测与评估[J]. 公路交通科技, 2012, 29(12): 41-47.
[13] 胡志文, 程培峰, 李泽闯, 董乃宝. 基于沉降差和动态变形模量的含巨粒土路基压实质量控制[J]. 森林工程, 2022, 38(1): 124-131.
[14] 王建立, 束冬林, 孙狂飙, 等. 一种中粗粒填料公路路基动态回弹模量快速测试仪[P]. 中国专利, CN210090163U. 2019-02-26.
[15] 宋慧来, 薛明星, 冯怀平, 等. 重载铁路路基动回弹模量影响因素及预估模型分析 [J]. 科学技术与工程, 2020, 20(10): 4080-4086.
[16] Monismith, C.L., Seed, H.B., Mitry, F.G. and Chan, C. (1967) Predictions of Pavement Deflections from Laboratory Tests. 2nd International Conference on the Structural Design of Asphalt Pavements, Ann Arbor, 7-11 August 1967.
[17] Lin, T., Ishikawa, T., Yang, J. and Tokoro, T. (2022) Evaluation of Climate Effect on Resilient Modulus of Granular Subgrade Material. Cold Regions Science and Technology, 194, Article ID: 103452. [Google Scholar] [CrossRef] 
[18] Alnedawi, A., Ullah, S., Azam, A., et al. (2022) Integrated and Holistic Knowledge Map of Resilient Modulus Studies for Pavement Materials: A Scientometric Analysis and Bibliometric Review of Research Frontiers and Prospects. Transportation Geotechnics, 33, Article ID: 100711. [Google Scholar] [CrossRef] 
[19] 张献民, 刘小兰. 基于路表应变和基频的基顶当量回弹模量研究 [J]. 振动、测试与诊断, 2021, 41(6): 1182-1189.
[20] 罗宏, 赵明华, 曹文贵, 胡天浩. 基于静载试验的土石混填路基压实度检测新方法[J]. 岩石力学与工程学报, 2007(S2): 4496-4502.

为你推荐