本文選題：厚層水泥穩(wěn)定碎石基層 + 路用性能　； 參考：《長(zhǎng)安大學(xué)》2015年碩士論文

【摘要】：水泥穩(wěn)定碎石基層以其強(qiáng)度高,承載力大,水穩(wěn)定性好,材料經(jīng)濟(jì)易得的優(yōu)點(diǎn),成為我國(guó)高等級(jí)公路基層的主要類(lèi)型。水泥穩(wěn)定碎石基層的厚度通常在25~36cm之間,在實(shí)際的施工過(guò)程中一般是分為兩層進(jìn)行攤鋪、碾壓,第一層施工結(jié)束,養(yǎng)生7天后再進(jìn)行第二層的施工攤鋪碾壓。分層壓實(shí)施工造成的主要問(wèn)題包括:整體性差,基層易產(chǎn)生損傷,以及上下基層裂縫相互反射以及工期長(zhǎng),增加工程造價(jià)。而目前國(guó)內(nèi)開(kāi)展的厚層水泥穩(wěn)定碎石基層整體攤鋪壓實(shí)技術(shù)需要施工單位專(zhuān)門(mén)配置大厚度攤鋪機(jī)和大激振力壓路機(jī),很多施工單位無(wú)法滿(mǎn)足這一要求。因此,有必要開(kāi)展對(duì)厚層水泥穩(wěn)定碎石基層分層連續(xù)攤鋪整體成型技術(shù)研究。本課題研究中設(shè)計(jì)了三種層間狀態(tài)的成型方式,對(duì)其路用性能進(jìn)行測(cè)試及分析,結(jié)果表明:層間結(jié)合狀態(tài)的下降導(dǎo)致基層路用性能的下降,與現(xiàn)有分層間斷施工工藝相比,厚層水泥穩(wěn)定碎石基層分層連續(xù)攤鋪技術(shù)能夠增強(qiáng)基層層間粘結(jié),進(jìn)而提高基層使用壽命。此外,利用有限元軟件建立路面數(shù)值模型,并對(duì)路面結(jié)構(gòu)內(nèi)各層層底拉應(yīng)力及路表彎沉值進(jìn)行計(jì)算分析,結(jié)果表明增強(qiáng)基層層間粘結(jié)能夠有效降低上基層層底拉應(yīng)力和路表彎沉值,提高基層使用壽命。對(duì)厚層水泥穩(wěn)定碎石基層施工機(jī)械進(jìn)行選型優(yōu)化,制定合理的攤鋪壓實(shí)工藝,并通過(guò)現(xiàn)場(chǎng)鋪筑試驗(yàn)路驗(yàn)證厚層水泥穩(wěn)定碎石基層分層連續(xù)攤鋪整體成型技術(shù)的可行性,并運(yùn)用壽命周期費(fèi)用分析法進(jìn)行了經(jīng)濟(jì)效益分析,分層連續(xù)施工工藝能夠大大降低建設(shè)成本及改建成本,能夠大范圍推廣應(yīng)用。
[Abstract]:Cement stabilized macadam base has become the main type of high grade highway base in our country because of its advantages of high strength, large bearing capacity, good water stability and easy to obtain material economy. The thickness of cement stabilized macadam base is usually between 25~36cm. In the actual construction process, it is usually divided into two layers for spreading, compacting, the first layer is finished, and the second layer is rolled after 7 days. The main problems caused by stratified compaction include poor integrity, easy damage of base, mutual reflection of cracks between upper and lower base, long construction period, and increasing project cost. At present, the whole spreading compaction technology of thick layer cement stabilized crushed stone base in our country needs to be equipped with large thickness paver and high exciting force roller. Many construction units can not meet this requirement. Therefore, it is necessary to study the integral forming technology of layered continuous spreading of thick-layer cement-stabilized macadam base. In this paper, three kinds of interlayer state molding methods are designed, and the road performance is tested and analyzed. The results show that the decrease of interlayer bonding state leads to the decrease of the road performance of the base course, compared with the existing layering intermittent construction technology. The layering continuous spreading technology of thick cement stabilized macadam base can enhance the bond between the base and improve the service life of the base. In addition, the numerical model of pavement is established by using finite element software, and the tensile stress of each layer of pavement structure and the deflection value of pavement surface are calculated and analyzed. The results show that strengthening interlayer bonding can effectively reduce the bottom tensile stress and the deflection value of the upper base layer and improve the service life of the base course. The construction machinery of thick layer cement stabilized macadam base is selected and optimized, the reasonable spreading compaction technology is established, and the feasibility of layered continuous paving technology of thick layer cement stabilized crushed stone base is verified by field paving test road. The economic benefits are analyzed by using the life-cycle cost analysis method. The layered and continuous construction technology can greatly reduce the cost of construction and reconstruction, and can be widely used.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U416.2

【共引文獻(xiàn)】

相關(guān)期刊論文 前1條

1 賀治增;;基于組合式基層的重載交通瀝青路面結(jié)構(gòu)優(yōu)化研究[J];交通科技;2014年03期

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本文編號(hào)：1774310