半刚性基层沥青路面结构高速弯沉仪应用误差

吴朝阳; 蒋鑫

doi:10.3969/j.issn.0258-2724.20200247

半刚性基层沥青路面结构高速弯沉仪应用误差

doi: 10.3969/j.issn.0258-2724.20200247

吴朝阳^1,2,3,,
蒋鑫^1,2,3, ,

基金项目: 四川省科技计划项目（2019YFS0492）；国家自然科学基金（51378440）

详细信息

作者简介:
吴朝阳（1983—），男，博士研究生，研究方向为路面工程，E-mail：chaoyangwu@qq.com

通讯作者:
蒋鑫（1976—），男，教授，博士，研究方向为路基路面工程，E-mail：xjiang01@163.com

中图分类号: V221.3
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- 文章访问数: 384
- HTML全文浏览量: 222
- PDF下载量: 20
- 被引次数: 0
出版历程
- 收稿日期: 2020-05-06
- 修回日期: 2020-08-10
- 网络出版日期: 2020-08-25
- 刊出日期: 2021-10-15

Application Error of Traffic Speed Deflectometer for Asphalt Pavement Structure with Semi-Rigid Base

WU Chaoyang^{1,2,3
,},
JIANG Xin^{1,2,3
, ,}

摘要

摘要: 为评估高速弯沉仪在半刚性基层沥青路面结构中的适用性，采用2.5D有限元方法建立高速弯沉仪移动荷载作用下路面结构数值模型，并评估其应用误差. 首先，利用两个前人研究成果验证2.5D有限元程序的可靠性；其次，对比了常用式、全厚式和半刚性基层3种典型沥青路面结构的弯沉斜率曲线，并总结了弯沉斜率特征；最后，针对半刚性基层沥青路面结构的高速弯沉仪应用误差予以评估. 研究结果表明：半刚性基层沥青路面结构弯沉斜率曲线存在多个峰值点；高速弯沉仪应用于半刚性基层沥青路面结构时，参照传感器读数不为0，将其应用于典型半刚性基层沥青路面结构时，因参照传感器误差引起的弯沉误差高达87.3%；为保证工程测试精度，高速弯沉仪应用于半刚性基层沥青路面结构时宜延长横梁长度至8.0 m.
- 高速弯沉仪 /
- 弯沉斜率 /
- 半刚性基层沥青路面结构 /
- 测试误差
Abstract: In order to evaluate the applicability of traffic speed deflectometer (TSD) in asphalt pavement structure with semi-rigid base, the 2.5D finite element method is employed to establish a numerical model subjected to the moving load of TSD. Firstly, the reliability of the 2.5D finite element program is verified with two previous published results. Then, the deflection slope curves of the conventional, full-depth and semi-rigid base asphalt pavement structure are studied and compared with each other, and their characteristics are summarized. Finally, the applicability error of TSD for asphalt pavement structure with semi-rigid base is examined. Results show that there are multiple peak points in the deflection slope curve of asphalt pavement with semi-rigid base. When TSD is applied to typical asphalt pavement structure with semi-rigid base, deflection test error caused by reference sensor error is as high as 87.3% while the reference sensor reading is not 0. In order to achieve accuracy result, the length of rigid beam of TSD is proposed to be extended to 8.0 m.
- traffic speed deflectometer /
- deflection slope /
- asphalt pavement structure with semi-rigid base /
- test error

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图 1 TSD设备内部组成及多普勒传感器布设示意

Figure 1. Innteral componets of TSD and placement of Doppler sensors

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图 2 多普勒激光测振仪系统工作原理

Figure 2. Working princliple of laser Doppler vibrometer system

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图 3 TSD弯沉拟合方法示意

Figure 3. Fitting method of TSD deflection test

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图 4 MnRoadCell 19路面结构及2.5D有限元模型

Figure 4. Pavement structure of MnRoad Cell 19 and 2.5D finite element model

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图 5 2.5D有限元与3D-MOVE ANALYSIS弯沉计算结果对比

Figure 5. Calculated result comparison between 2.5D finite element modeland 3D-MOVE ANALYSIS

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图 6 2.5D有限元和3D有限元模型计算结果对比

Figure 6. Comparison between 2.5D and 3D finite element model for semi-rigid pavement structure

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图 7 3种沥青路面结构弯沉斜率

Figure 7. Deflection slope curves of three types of asphalt pavement structure under the moving load of TSD

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图 8 忽略S3500传感器弯沉斜率时计算弯沉和拟合弯沉的差异

Figure 8. Difference between fitting deflection and calculated deflection in the case of ignoring of S3500 sensor deflection

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图 9 半刚性基层沥青路面不同土基模量结构弯沉斜率曲线

Figure 9. Influence of subgrade modulus on deflection slope in asphalt pavement with semi-rigid base

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表 1 路面结构材料参数表

Table 1. Material parameters of pavement structure

层位	材料	瞬态模量/MPa	泊松比	密度/ （kg•m⁻³）	厚度/ cm
上面层	SMA-16	1550	0.35	2400	4
中面层	AC-25	1250	0.35	2400	5
下面层	AC-30	2450	0.35	2400	7
上基层	二灰砂	10000	0.25	2100	38
下基层	石灰土	2000	0.35	1900	36
土基	土基	250	0.40	1900	600

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表 2 沥青混合料Prony级数参数

Table 2. Prony series parameters of asphalt mixture

${\tau}$/s	g
${\tau}$/s	SMA-16	AC-25	AC-30
1 × 10⁻⁵	0.7490	0.3933	0.3696
1 × 10⁻⁴	0.1063	0.2357	0.2011
1 × 10⁻³	0.0643	0.1867	0.1942
1 × 10⁻²	0.0290	0.1168	0.1223
1 × 10⁻¹	0.0145	0.0438	0.0574
1 × 10⁰	0.0068	0.0153	0.0235
1 × 10¹	0.0036	0.0044	0.0100
1 × 10²	0.0017	0.0007	0.0041
1 × 10³	0.0013	0.0018	0.0027

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表 3 路面结构厚度及模量

Table 3. Parameters of asphalt pavement structure

路段	面层厚度/cm	面层模量/MPa	基层厚度/cm	基层模量/MPa	土基厚度/cm	土基模量/MPa
PA-144	16.5	1585.3	20.9	275.2	139.7	158.3
ID-22	8.3	2516.1	20.4	208.7	127.0	74.2
US9-43	22.8	3462.0			350.0	188.0
CDN	18.0	10000.0	50.0	13000.0	600.0	60.0

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