深圳大学学报理工版

水泥稳定碎石材料用做路面基层及底基层时,由于施工期养生龄期不足和车辆荷载超载,会造成不可逆疲劳损伤.为得到施工荷载对水泥稳定碎石底基层造成的疲劳损伤,基于Miner理论和ABAQUS软件,进行弯拉强度试验和疲劳试验,分析了9种车辆荷载下,底基层厚度分别为16、20、24、28和32 cm时,最大层底拉应力与底基层厚度的关系,以及底基层模量分别为400、800、1 200、1 600 和2 000 MPa时,最大层底拉应力与底基层模量的关系. 研究结果表明,随着底基层厚度的增加,底基层层底拉应力不断减小,减小率最大为8.8%; 随着底基层模量的增加,底基层层底拉应力不断增大,但增长率不断降低. 依托实际工程,可得到水泥稳定碎石底基层疲劳预估方程,基于Miner理论计算得到不同工况下,不同施工荷载对底基层造成的疲劳损伤程度,为路面设计和施工提供指导.

When cement stabilized gravel materials are used as pavement base and sub-base, irreversible fatigue damage often occurs due to insufficient maintenance days during the construction period and overload of vehicle load. In order to obtain the fatigue damage caused by the construction load on the cement stabilized gravel sub-base, the flexural tensile strength test and the fatigue test are carried out based on Miner theory and ABAQUS software. Under 9 kinds of vehicle load, we analyze both the relationship between the maximum tensile stress of the sub-base layer and the substrate thickness when the substrate thickness is 16, 20, 24, 28, and 32 cm and the relationship between the maximum tensile stress of the sub-base layer and the modulus of the sub-base when the modulus of the subbase is 400, 800, 1 200, 1 600, and 2 000 MPa, respectively. The research results show that with the increase of the thickness of the sub-base layer, the tensile stress of the sub-base decreases gradually, and the maximum reduction rate is 8.8%. With the growth of the sub-base modulus, the bottom tensile stress of the sub-base layer increases gradually, but the growth rate continues to decrease. Relying on the actual engineering project, the fatigue prediction equation of the cement stabilized gravel sub-base can be obtained by using Miner theory to calculate the fatigue damage degree of the subbase caused by different construction loads under different working conditions, which provides guidance for the design and construction of the pavement.

引言
1 施工期水稳底基层荷载应力分析
2 水稳底基层的疲劳损伤研究
3 施工期水稳底基层疲劳损伤计算
4 结论

表1 运料车次
Table 1 Number of vehicles

表2 标准轴载作用次数<br/>Table 2 Number of action of standard axle load

表2 标准轴载作用次数
Table 2 Number of action of standard axle load

图1 底基层厚度与最大层底拉应力的关系<br/>Fig.1 (Color online)Relationship between maximum sub-base tensile stress and substrate thickness

图1 底基层厚度与最大层底拉应力的关系
Fig.1 (Color online)Relationship between maximum sub-base tensile stress and substrate thickness

图2 底基层模量与最大层底拉应力的关系<br/>Fig.2 (Color online)The relationship between the maximum tensile stress of the sub-base layer and the modulus of the sub-base layer

图2 底基层模量与最大层底拉应力的关系
Fig.2 (Color online)The relationship between the maximum tensile stress of the sub-base layer and the modulus of the sub-base layer

图3 不同养生龄期下的弯拉强度<br/>Fig.3 Bending tensile strength at different health ages

图3 不同养生龄期下的弯拉强度
Fig.3 Bending tensile strength at different health ages

表3 各结构层计算参数<br/>Table 3 Calculation parameters of each structural layer

表3 各结构层计算参数
Table 3 Calculation parameters of each structural layer

图4 不同情况下计算得到的最大层底拉应力<br/>Fig.4 (Color online)Maximum base layer tensile stress calculated under different conditions

图4 不同情况下计算得到的最大层底拉应力
Fig.4 (Color online)Maximum base layer tensile stress calculated under different conditions

图5 不同施工时期的路面工况模型<br/>Fig.5 Models of pavement conditions in different construction periods

图5 不同施工时期的路面工况模型
Fig.5 Models of pavement conditions in different construction periods

图6 不同工况下不同轴载作用的最大层底拉应力<br/>Fig.6 (Color online)Maximum bottom layer tensile stress of different loads under different working conditions

图6 不同工况下不同轴载作用的最大层底拉应力
Fig.6 (Color online)Maximum bottom layer tensile stress of different loads under different working conditions

表4 不同工况和荷载下的应力比<br/>Table 4 Stress ratio under different working conditions and loads

表4 不同工况和荷载下的应力比
Table 4 Stress ratio under different working conditions and loads

表5 不同工况和轴载下底基层的疲劳损伤情况<br/>Table 5 Fatigue damages of sub-base under different working conditions and loads

表5 不同工况和轴载下底基层的疲劳损伤情况
Table 5 Fatigue damages of sub-base under different working conditions and loads

[1] MARANDI S M, SAFAPOUR P. Base course modification through stabilization using cement and bitumen[J]. American Journal of Applied Sciences, 2009, 6(1):30- 42.
[2] LI Qiang, WANG Zhibing, LI Yuliang, et al. Cold recycling of lime-fly ash stabilized macadam mixtures as pavement bases and subbases[J]. Construction and Building Materials, 2018, 169(30):306-314.
[3] YE Hongyu, WANG Xuancang, FANG Naren, et al. Low-temperature performance and evaluation index of gussasphalt for steel bridge decks[J]. Advances in Materials Science and Engineering, 2019(2):1-11.
[4] 王艳,倪富健,李再新. 水泥稳定碎石基层温缩性能试验及预估控制[J]. 东南大学学报自然科学版,2008,38(2):260-264.
[5] 周辉勇. 水泥稳定碎石基层路用性能及施工技术研究[J]. 工程建设与设计,2017(10):74-75.
[6] 曹强. 水泥稳定碎石基层施工期结构损伤分析及其处治措施研究[D]. 长沙:长沙理工大学,2015.
[7] 张丽宏,廖福星,刘巨伟. 水泥稳定碎石基层裂缝的控制[J]. 筑路机械与施工机械化,2010,27(7):60- 63.
[8] YOON S, ABU-FARSAKH M. Laboratory investigation on the strength characteristics of cement-sand as base material[J]. Ksce Journal of Civil Engineering, 2009, 13(1): 15-22.
[9] LI Wei, LANG Lei, LIN Zhenyue, et al. Characteristics of dry shrinkage and temperature shrinkage of cement-stabilized steel slag[J]. Construction and Building Materials, 2017, 134(3):540-548.
[10] 吕松涛,陈杰东,张晖. 水泥稳定碎石拉压弯静态模量与动态模量比较分析[J]. 公路交通科技,2016,33(10):39- 43,59.
[11] 张敏江,方竹胜,刘洪涛,等. 水泥稳定级配碎石基层材料路用性能及超轴载下疲劳寿命研究[J]. 沈阳建筑大学学报自然科学版,2016,32(6):1075-1082.
[12] 孟岩,郭林泉,谈至明. 路面载重车辆的荷载特征[J]. 公路交通科技,2007,24(4):1- 6.
[13] 陈飞,马融. 基于两阶段水泥稳定碎石基层寿命预估研究[J]. 公路,2016,61(5):174-177.
[14] 何锐. 基于实测轴载谱的沥青路面轴载换算与设计参数研究[D]. 西安:长安大学,2010.
[15] HADI M, RUI F, GUANG Y, et al. Microstructure-based prediction of the elastic behaviour of hydrating cement pastes[J]. Applied Sciences-Basel, 2018, 8(3): 442- 445.
[16] MA Yinhua, GU Jianyi, LI Ya, et al. The bending fatigue performance of cement-stabilized aggregate reinforced with polypropylene filament fiber[J]. Construction and Building Materials, 2015, 132(3): 230-236.
[17] WANG Xuancang, FANG Naren, YE Hongyu, et al. Fatigue damage analysis of cement-stabilized base under construction loading[J]. Applied Sciences-Basel, 2018, 8(11): 2263-2283.
[18] WANG Xuancang, SU Ziyuan, XU Aimin, et al. Shear fatigue between asphalt pavement layers and its application in design[J]. Construction and Building Materials, 2017, 134(3):297-305.
[19] 郭芳,付宏渊,邵腊庚. 基于环境温度变化的混合式基层沥青路面结构疲劳损伤分析[J]. 中南大学学报自然科学版,2015,46(5):1869-1875.
[20] 孙志林,贺三春,王辉. 低温荷载下沥青路面非线性疲劳损伤数值模拟[J]. 应用力学学报,2017,34(1):149-154,203.

备注

引言

1 施工期水稳底基层荷载应力分析

2 水稳底基层的疲劳损伤研究

3 施工期水稳底基层疲劳损伤计算

4 结论

期刊信息

备注

引言

1 施工期水稳底基层荷载应力分析

2 水稳底基层的疲劳损伤研究

3 施工期水稳底基层疲劳损伤计算

4 结 论

期刊信息

4 结论