發(fā)布時間：2018-11-26 21:11

【摘要】：基層在養(yǎng)生期結束后,由于路面結構的承載體系沒有完成鋪筑,長期通行的施工運輸車輛在基層表面反復作用導致路面結構強度存在不同程度的喪失。施工期結構損傷會表現(xiàn)為基層裂縫、表面出現(xiàn)坑槽、脫皮等病害,如果沒有對其進行控制,結構強度會進一步降低并發(fā)展為結構性破壞即完全喪失結構強度。目前對于水泥穩(wěn)定碎石基層的研究重點在于材料設計參數(shù)、配合比設計、抗裂技術等方面,對于施工期結構損傷的研究還較少,也不夠全面。因此,論文主要從施工期結構損傷的調(diào)查、原因分析、預防措施、處治措施等方面對其進行了全面的分析研究。通過對依托工程的結構損傷調(diào)查發(fā)現(xiàn),底基層結構損傷最為嚴重,下基層次之,上基層最小�，F(xiàn)場的鉆芯取樣、彎沉試驗表明:發(fā)生施工期結構損傷以后,路面結構層厚度的均勻性受到嚴重影響,結構承載能力下降。運用Bisar3.0軟件計算分析了施工期間結構參數(shù)變化對結構層受力的影響,結果表明:無論是底基層厚度減小模量增大,還是下基層厚度模量減小都將導致底基層最大應力值出現(xiàn)不同程度的增大,將會減小底基層的疲勞壽命。分析認為引起施工期結構損傷的主要原因為施工工序的不合理安排、嚴重超載的施工運輸車輛長期作用基層表面等。研究表明采用一次成型施工技術能夠有效的預防施工期結構損傷,半剛性基層采用分層成型技術施工時通過限制施工運輸車輛軸重也能夠預防施工期結構損傷。通過增加隨后鋪筑結構層厚度和強度的處治措施能夠將發(fā)生施工期損傷的路面結構強度恢復至原設計路面,從而能夠減小水穩(wěn)基層施工期結構損傷所帶來的損失。研究得出的施工期結構損傷預防及處治措施可供類似工程建設參考。
[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.
【學位授予單位】：長沙理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U416.214

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本文編號：2359628