Most view articles
2023, 43(6):74-78.
DOI: 10.14048/j.issn.1671-2579.2023.06.012
Abstract:
为了准确地测定出沥青路面的表面纹理信息 ，采用佛罗里达纹理仪 （简称 FTM ）分别对 12条沥青路面进行平均轮廓深度 （简称 DMPD）检测 ，以检测的 DMPD数据为依据 ，分析 FTM 的精准度 ，探讨 FTM 测量数据的影响因素 。在此基础上 ，对比 FTM 与圆形轨道仪 （CTM ）测得的数据 ，进一步验证 FTM 在沥青道路表面纹理信息测量方面的可靠性 。结果表明 ：FTM 可以有效地检测沥青路面表面纹理信息 ，利用 FTM 可以快速测得 DMPD；FTM 与CTM 两种方法测得结果之间存在很高的相关性 ，FTM 测试结果可以作为表征沥青路面抗滑性能的可靠依据 ；此外 ，测试地点 、级配类型和集料类型对所测道路表面纹理有显著的影响 。
为了准确地测定出沥青路面的表面纹理信息 ，采用佛罗里达纹理仪 （简称 FTM ）分别对 12条沥青路面进行平均轮廓深度 （简称 DMPD）检测 ，以检测的 DMPD数据为依据 ，分析 FTM 的精准度 ，探讨 FTM 测量数据的影响因素 。在此基础上 ，对比 FTM 与圆形轨道仪 （CTM ）测得的数据 ，进一步验证 FTM 在沥青道路表面纹理信息测量方面的可靠性 。结果表明 ：FTM 可以有效地检测沥青路面表面纹理信息 ，利用 FTM 可以快速测得 DMPD；FTM 与CTM 两种方法测得结果之间存在很高的相关性 ，FTM 测试结果可以作为表征沥青路面抗滑性能的可靠依据 ；此外 ，测试地点 、级配类型和集料类型对所测道路表面纹理有显著的影响 。
2024, 44(2):27-53.
DOI: 10.14048/j.issn.1671-2579.2024.02.004
Abstract:
The rigid-flexible composite pavement，as a kind of durable pavement structure，has been widely used for heavy-duty traffic，special geological conditions，bridge tunnel paving，etc.In order to promote the application of durable rigid-flexible composite pavements and clarify the key research issues and development directions，relevant research progress of rigid-flexible composite pavements in China and abroad was reviewed.Based on the structure design theory and construction technology of rigid-flexible composite pavements，the structural mechanical behavior characteristics of rigid-flexible composite pavements were described，and the stress induced by load and temperature of asphalt surface layer and rigid base layer，as well as their interactions were analyzed.The asphalt surface layer on the rigid base layer was directly subjected to the load and environmental effects and improved the stress and temperature fields of the underlying structural layer.It was the key factor influencing the performance and service life of rigid-flexible composite pavements.It was identified that diseases of rigid-flexible composite pavements mainly appeared in the asphalt surface layer.Due to the huge modulus difference between the asphalt surface layer and the rigid base layer，the asphalt surface layer on the rigid base layer was more prone to produce compression-shear failure.The cracking of the rigid base layer and the bonding state between rigid and flexible layers also played an important role in the performance of asphalt pavements.Finally，the technology of improving the performance of rigid-flexible composite pavements was summarized from three aspects：shear resistance of asphalt surface layer，integrity of base panel，and bonding between the flexible and rigid layers.It was an effective way to improve the performance and durability of rigid-flexible composite pavements by conducting integrated structure-high-performance material design based on the structural mechanical characteristics of rigid-flexible composite pavements.
The rigid-flexible composite pavement，as a kind of durable pavement structure，has been widely used for heavy-duty traffic，special geological conditions，bridge tunnel paving，etc.In order to promote the application of durable rigid-flexible composite pavements and clarify the key research issues and development directions，relevant research progress of rigid-flexible composite pavements in China and abroad was reviewed.Based on the structure design theory and construction technology of rigid-flexible composite pavements，the structural mechanical behavior characteristics of rigid-flexible composite pavements were described，and the stress induced by load and temperature of asphalt surface layer and rigid base layer，as well as their interactions were analyzed.The asphalt surface layer on the rigid base layer was directly subjected to the load and environmental effects and improved the stress and temperature fields of the underlying structural layer.It was the key factor influencing the performance and service life of rigid-flexible composite pavements.It was identified that diseases of rigid-flexible composite pavements mainly appeared in the asphalt surface layer.Due to the huge modulus difference between the asphalt surface layer and the rigid base layer，the asphalt surface layer on the rigid base layer was more prone to produce compression-shear failure.The cracking of the rigid base layer and the bonding state between rigid and flexible layers also played an important role in the performance of asphalt pavements.Finally，the technology of improving the performance of rigid-flexible composite pavements was summarized from three aspects：shear resistance of asphalt surface layer，integrity of base panel，and bonding between the flexible and rigid layers.It was an effective way to improve the performance and durability of rigid-flexible composite pavements by conducting integrated structure-high-performance material design based on the structural mechanical characteristics of rigid-flexible composite pavements.
2023, 43(5):1-8.
DOI: 10.14048/j.issn.1671-2579.2023.05.001
Abstract:
针对各国沥青稳定 +无机结合料稳定组合式基层沥青路面的材料组成 、结构形式 、破坏类型 、病害成因 、设计指标与设计方法存在较大差异的现状 ，该文对此类沥青路面当前国内外所选取的材料类型与结构形式进行归纳 ，分析此类沥青路面结构的破坏类型及病害成因 ，探讨各国在组合式基层沥青路面设计方法方面的差异 ，并总结各国的病害控制类型和设计指标 ，据此推荐了组合式基层沥青路面合理的材料 、结构组合与设计指标 ，为此类沥青路面的设计与应用提供参考 。
针对各国沥青稳定 +无机结合料稳定组合式基层沥青路面的材料组成 、结构形式 、破坏类型 、病害成因 、设计指标与设计方法存在较大差异的现状 ，该文对此类沥青路面当前国内外所选取的材料类型与结构形式进行归纳 ，分析此类沥青路面结构的破坏类型及病害成因 ，探讨各国在组合式基层沥青路面设计方法方面的差异 ，并总结各国的病害控制类型和设计指标 ，据此推荐了组合式基层沥青路面合理的材料 、结构组合与设计指标 ，为此类沥青路面的设计与应用提供参考 。
2020, 40(1):262-267.
DOI: 10.14048/j.issn.1671-2579.2020.01.053
Abstract:
为确定车辆在互通式立交出口匝道满足安全行驶需求的运行速度过渡段最小长度，分别建立了满足超高过渡、变速行驶、3 s行程时间及横向加速度变化率适中等要求的运行速度过渡段长度计算模型。采用UMRR链式开普勒雷达测速仪，实测不同主线设计速度下立交出口匝道分流鼻运行速度，结合SPSS软件分析，得到分流鼻运行速度。基于运行速度过渡段长度计算模型和典型参数的分析论证，得到了满足不同需求下的运行速度过渡段长度。结果表明：匝道设计速度为30~40 km/h时，车辆变速行驶需求为运行速度过渡段长度的主要控制因素；匝道设计速度为50~80 km/h时，超高过渡、3 s行程时间为运行速度过渡段长度的主要控制因素；基于安全行驶需求，提出了互通式立交出口匝道运行速度过渡段长度最小建议值及纵坡修正系数。
为确定车辆在互通式立交出口匝道满足安全行驶需求的运行速度过渡段最小长度，分别建立了满足超高过渡、变速行驶、3 s行程时间及横向加速度变化率适中等要求的运行速度过渡段长度计算模型。采用UMRR链式开普勒雷达测速仪，实测不同主线设计速度下立交出口匝道分流鼻运行速度，结合SPSS软件分析，得到分流鼻运行速度。基于运行速度过渡段长度计算模型和典型参数的分析论证，得到了满足不同需求下的运行速度过渡段长度。结果表明：匝道设计速度为30~40 km/h时，车辆变速行驶需求为运行速度过渡段长度的主要控制因素；匝道设计速度为50~80 km/h时，超高过渡、3 s行程时间为运行速度过渡段长度的主要控制因素；基于安全行驶需求，提出了互通式立交出口匝道运行速度过渡段长度最小建议值及纵坡修正系数。
2024, 44(2):282-288.
DOI: 10.14048/j.issn.1671-2579.2024.02.032
Abstract:
Owing to poor gradation and high liquid limit and plasticity index，the application of gravel laterite on road paving is limited in West Africa.To overcome this issue，laterite granule combined with sand at different content was explored.The performance including the particle composition，limit water content and CBR value was investigated.The results indicate that sand treatment can improve the gradation，enhance the compactness，and reduce the plasticity index.The improved gravel laterite can meet the requirements of subbase，cushion，and base courses.Cement treatment can improve the mechanical properties of laterite grains.Cement and sand content affect the unconfined compressive strength significantly，with an optimal sand content range identified.Specifically，laterite granules mixed with sand and stabilized with 2.5% PK 58 cement and 3.5% PK 6 cement meet the specifications for cushion layer materials in inverted structures in West Africa.The overall findings contribute to localization design and the optimization of indigenous materials in West Africa，broadening their application scope and enhancing their use in construction projects，offering valuable insights for Chinese engineering projects in West Africa.
Owing to poor gradation and high liquid limit and plasticity index，the application of gravel laterite on road paving is limited in West Africa.To overcome this issue，laterite granule combined with sand at different content was explored.The performance including the particle composition，limit water content and CBR value was investigated.The results indicate that sand treatment can improve the gradation，enhance the compactness，and reduce the plasticity index.The improved gravel laterite can meet the requirements of subbase，cushion，and base courses.Cement treatment can improve the mechanical properties of laterite grains.Cement and sand content affect the unconfined compressive strength significantly，with an optimal sand content range identified.Specifically，laterite granules mixed with sand and stabilized with 2.5% PK 58 cement and 3.5% PK 6 cement meet the specifications for cushion layer materials in inverted structures in West Africa.The overall findings contribute to localization design and the optimization of indigenous materials in West Africa，broadening their application scope and enhancing their use in construction projects，offering valuable insights for Chinese engineering projects in West Africa.
2024, 44(2):274-281.
DOI: 10.14048/j.issn.1671-2579.2024.02.031
Abstract:
The current bridge maintenance sy stem in China primarily relies on bridge inspection data to prioritize the state of bridges and allocate a limited budget accordingly.This strategy focuses on repairing bridges with low performance，concentrating on restorative maintenance but ignoring preventive maintenance.In view of the total lifecycle cost，the repair-oriented method may require a lower initial investment but leads to significant resource consumption in the mid to late stages.Based on existing highway bridge maintenance systems，an intelligent maintenance system relying on Chinese standards and bridge inspection data and combining repair and prevention was developed.The system model mainly consisted of two modules：the bridge performance degradation model and the intelligent maintenance decision model.Firstly，the long-term performance of the bridge was predicted based on dynamic Markov and Weibull models using long-term inspection data and mathematical statistics.On this basis，a mathematical model following preventive maintenance concepts was established，and it was optimized and solved by using swarm intelligence algorithms.Finally，a prestressed concrete box girder bridge on the Banyin Passage in Shenzhen was studied，and the model was tested using actual bridge inspection data.The results show that compared with traditional maintenance methods，the intelligent maintenance system can reduce maintenance costs by up to 10%.
The current bridge maintenance sy stem in China primarily relies on bridge inspection data to prioritize the state of bridges and allocate a limited budget accordingly.This strategy focuses on repairing bridges with low performance，concentrating on restorative maintenance but ignoring preventive maintenance.In view of the total lifecycle cost，the repair-oriented method may require a lower initial investment but leads to significant resource consumption in the mid to late stages.Based on existing highway bridge maintenance systems，an intelligent maintenance system relying on Chinese standards and bridge inspection data and combining repair and prevention was developed.The system model mainly consisted of two modules：the bridge performance degradation model and the intelligent maintenance decision model.Firstly，the long-term performance of the bridge was predicted based on dynamic Markov and Weibull models using long-term inspection data and mathematical statistics.On this basis，a mathematical model following preventive maintenance concepts was established，and it was optimized and solved by using swarm intelligence algorithms.Finally，a prestressed concrete box girder bridge on the Banyin Passage in Shenzhen was studied，and the model was tested using actual bridge inspection data.The results show that compared with traditional maintenance methods，the intelligent maintenance system can reduce maintenance costs by up to 10%.
