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
发布时间：2018-11-26 21:11
【摘要】：基层在养生期结束后,由于路面结构的承载体系没有完成铺筑,长期通行的施工运输车辆在基层表面反复作用导致路面结构强度存在不同程度的丧失。施工期结构损伤会表现为基层裂缝、表面出现坑槽、脱皮等病害,如果没有对其进行控制,结构强度会进一步降低并发展为结构性破坏即完全丧失结构强度。目前对于水泥稳定碎石基层的研究重点在于材料设计参数、配合比设计、抗裂技术等方面,对于施工期结构损伤的研究还较少,也不够全面。因此,论文主要从施工期结构损伤的调查、原因分析、预防措施、处治措施等方面对其进行了全面的分析研究。通过对依托工程的结构损伤调查发现,底基层结构损伤最为严重,下基层次之,上基层最小。现场的钻芯取样、弯沉试验表明:发生施工期结构损伤以后,路面结构层厚度的均匀性受到严重影响,结构承载能力下降。运用Bisar3.0软件计算分析了施工期间结构参数变化对结构层受力的影响,结果表明:无论是底基层厚度减小模量增大,还是下基层厚度模量减小都将导致底基层最大应力值出现不同程度的增大,将会减小底基层的疲劳寿命。分析认为引起施工期结构损伤的主要原因为施工工序的不合理安排、严重超载的施工运输车辆长期作用基层表面等。研究表明采用一次成型施工技术能够有效的预防施工期结构损伤,半刚性基层采用分层成型技术施工时通过限制施工运输车辆轴重也能够预防施工期结构损伤。通过增加随后铺筑结构层厚度和强度的处治措施能够将发生施工期损伤的路面结构强度恢复至原设计路面,从而能够减小水稳基层施工期结构损伤所带来的损失。研究得出的施工期结构损伤预防及处治措施可供类似工程建设参考。
[Abstract]:After the curing period of the base course, because the bearing system of the pavement structure has not completed the paving, the repeated action of the long-running construction transportation vehicle on the surface of the base course results in the loss of the strength of the pavement structure to varying degrees. During the construction period, the structural damage will be shown as cracks in the base course, pit holes on the surface, peeling and other diseases. If it is not controlled, the structural strength will be further reduced and developed into structural damage, that is, the structural strength will be completely lost. At present, the research on cement stabilized macadam base is focused on material design parameters, mix ratio design, crack resistance technology and so on. The research on structural damage during construction is less and less comprehensive. Therefore, the paper makes a comprehensive analysis and research on the structural damage during construction from the aspects of investigation, cause analysis, prevention measures, treatment measures and so on. Through the investigation of the structural damage of the supporting engineering, it is found that the damage of the bottom base is the most serious, the lower base is the second, and the upper base is the least. The in-situ core sampling and deflection test show that the uniformity of pavement layer thickness is seriously affected and the bearing capacity of the structure decreases after the structural damage occurs during the construction period. The influence of structural parameters on the stress of the structure layer during construction is analyzed by Bisar3.0 software. The results show that the thickness of the base increases, and the modulus increases. The decrease of the thickness modulus of the lower base will lead to the increase of the maximum stress value of the bottom base to some extent and the decrease of the fatigue life of the base. It is considered that the main causes of structural damage during construction are the unreasonable arrangement of construction procedure and the long-acting surface of construction transport vehicle. The results show that the primary construction technology can effectively prevent the structural damage during the construction period, and the semi-rigid base course can also prevent the structural damage during construction by limiting the axle load of the transport vehicle during the construction of the semi-rigid base course by using the stratified molding technology. By increasing the thickness and strength of the subsequent pavement layer, the strength of the pavement structure damaged during the construction period can be restored to the original design road surface, thus reducing the loss caused by the structural damage caused by the water stabilized base during the construction period. The structural damage prevention and treatment measures obtained from the study can be used as reference for similar engineering construction.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.214
[Abstract]:After the curing period of the base course, because the bearing system of the pavement structure has not completed the paving, the repeated action of the long-running construction transportation vehicle on the surface of the base course results in the loss of the strength of the pavement structure to varying degrees. During the construction period, the structural damage will be shown as cracks in the base course, pit holes on the surface, peeling and other diseases. If it is not controlled, the structural strength will be further reduced and developed into structural damage, that is, the structural strength will be completely lost. At present, the research on cement stabilized macadam base is focused on material design parameters, mix ratio design, crack resistance technology and so on. The research on structural damage during construction is less and less comprehensive. Therefore, the paper makes a comprehensive analysis and research on the structural damage during construction from the aspects of investigation, cause analysis, prevention measures, treatment measures and so on. Through the investigation of the structural damage of the supporting engineering, it is found that the damage of the bottom base is the most serious, the lower base is the second, and the upper base is the least. The in-situ core sampling and deflection test show that the uniformity of pavement layer thickness is seriously affected and the bearing capacity of the structure decreases after the structural damage occurs during the construction period. The influence of structural parameters on the stress of the structure layer during construction is analyzed by Bisar3.0 software. The results show that the thickness of the base increases, and the modulus increases. The decrease of the thickness modulus of the lower base will lead to the increase of the maximum stress value of the bottom base to some extent and the decrease of the fatigue life of the base. It is considered that the main causes of structural damage during construction are the unreasonable arrangement of construction procedure and the long-acting surface of construction transport vehicle. The results show that the primary construction technology can effectively prevent the structural damage during the construction period, and the semi-rigid base course can also prevent the structural damage during construction by limiting the axle load of the transport vehicle during the construction of the semi-rigid base course by using the stratified molding technology. By increasing the thickness and strength of the subsequent pavement layer, the strength of the pavement structure damaged during the construction period can be restored to the original design road surface, thus reducing the loss caused by the structural damage caused by the water stabilized base during the construction period. The structural damage prevention and treatment measures obtained from the study can be used as reference for similar engineering construction.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.214
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3 李，
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