本文選題：水泥穩(wěn)定碎石 + 微裂　； 參考：《河北工業(yè)大學(xué)》2015年碩士論文

【摘要】：水泥穩(wěn)定碎石基層材料在早期養(yǎng)護(hù)期間往往會(huì)產(chǎn)生收縮裂縫,進(jìn)而導(dǎo)致路面反射裂縫的發(fā)生,對(duì)此本文引入一種基于工程措施的預(yù)防水泥穩(wěn)定類基層瀝青路面反射裂縫的新技術(shù)——微裂技術(shù)。微裂技術(shù)是指水泥穩(wěn)定類基層經(jīng)過較短養(yǎng)護(hù)時(shí)期(一般為1~3d)后,讓振動(dòng)壓路機(jī)碾壓基層,產(chǎn)生微細(xì)裂縫網(wǎng)絡(luò),可避免基層材料由于自身收縮產(chǎn)生嚴(yán)重的寬或長裂縫。微裂后基層力學(xué)強(qiáng)度只是暫時(shí)損失,會(huì)隨齡期逐漸恢復(fù),影響其恢復(fù)能力的主要因素有混合料結(jié)構(gòu)類型、水泥劑量、微裂實(shí)施時(shí)間和微裂損傷程度等。要研究微裂技術(shù),需從不同影響因素下水穩(wěn)碎石基層材料微裂后力學(xué)強(qiáng)度發(fā)展規(guī)律、抗收縮性能和對(duì)瀝青路面結(jié)構(gòu)力學(xué)行為影響等方面展開工作,本文主要對(duì)以下內(nèi)容做重點(diǎn)研究:(1)在闡述水穩(wěn)碎石基層材料微裂技術(shù)及作用機(jī)理基礎(chǔ)上,分析了微裂技術(shù)影響因素,并提出室內(nèi)微裂試驗(yàn)方案;同時(shí),通過大量試驗(yàn)找出振動(dòng)壓實(shí)儀一定振動(dòng)參數(shù)下水穩(wěn)碎石試件在不同影響因素下微裂損傷程度與振動(dòng)時(shí)間的對(duì)應(yīng)關(guān)系。(2)制備微裂程度不同的試樣,并對(duì)不同水泥劑量、不同微裂實(shí)施時(shí)間和不同微裂損傷程度下的試樣進(jìn)行無側(cè)限抗壓、劈裂抗拉、抗壓回彈和收縮特性(干縮和溫縮)等力學(xué)性能試驗(yàn)研究,分析水穩(wěn)碎石材料微裂后力學(xué)強(qiáng)度發(fā)展過程及對(duì)基層材料收縮特性影響,并總結(jié)水穩(wěn)碎石材料微裂力學(xué)變化規(guī)律。(3)根據(jù)微裂后水穩(wěn)碎石基層材料力學(xué)發(fā)展規(guī)律,借助KENPAVE路面分析軟件系統(tǒng)分析了水穩(wěn)碎石基層采用微裂技術(shù)后,在標(biāo)準(zhǔn)軸載和不同軸載水平下,瀝青路面結(jié)構(gòu)層間最大剪應(yīng)力、層底最大拉應(yīng)力和路面彎沉等力學(xué)行為。(4)結(jié)合微裂技術(shù)在104國道滄州吳橋段路面結(jié)構(gòu)大修工程中的應(yīng)用,配合軟件分析與室內(nèi)試驗(yàn),探討研究內(nèi)容實(shí)際應(yīng)用的可能性。將試驗(yàn)路實(shí)測數(shù)據(jù)與軟件模擬結(jié)果對(duì)照分析,為微裂技術(shù)在實(shí)際工程中的推廣、應(yīng)用與研究提供可靠依據(jù)。
[Abstract]:Cement stabilized macadam base materials often produce shrinkage cracks during early maintenance, which leads to the occurrence of pavement reflective cracks. In this paper, a new technique of preventing reflection crack of cement stabilized base asphalt pavement based on engineering measures, micro-crack technology, is introduced in this paper. The micro-crack technology means that after a short curing period (generally 1 ~ 3 days), the vibratory roller compacts the base course and produces a fine crack network, which can avoid the serious wide or long cracks caused by the shrinkage of the base material. The mechanical strength of the base course after microcrack is only temporary and will recover gradually with the age. The main factors affecting the recovery ability are the structure type of the mixture, cement dosage, the time of microcrack implementation and the degree of microcrack damage and so on. In order to study micro-crack technology, it is necessary to work on the development law of mechanical strength, shrinkage resistance and influence on the mechanical behavior of asphalt pavement structure after microcrack of the base material of water-stabilized crushed stone with different influencing factors. This paper mainly focuses on the following contents: (1) on the basis of expounding the micro-crack technology and mechanism of water-stabilized crushed stone base material, the influencing factors of micro-crack technology are analyzed, and the indoor micro-crack test scheme is put forward, at the same time, Through a large number of tests, we find out the corresponding relationship between the degree of micro-crack damage and the vibration time of the specimen with certain vibration parameters of the vibratory compaction meter under different influence factors. (2) the samples with different microcrack degree are prepared, and the different cement doses are obtained. The mechanical properties of the specimens with different microcracking time and damage degree were studied, such as unconfined compression, splitting tensile resistance, compressive springback and shrinkage characteristics (dry shrinkage and temperature shrinkage). This paper analyzes the development process of mechanical strength and its influence on the shrinkage characteristics of the base material after micro-crack of the water-stabilized crushed stone material, and summarizes the law of the micro-crack mechanics change of the water-stabilized crushed stone material according to the law of the mechanics development of the water-stabilized crushed stone base material after the micro-crack. With the aid of KENPAVE pavement analysis software, the maximum shear stress between layers of asphalt pavement structure is analyzed under standard axial load and different axial load levels after adopting micro-crack technology. The application of micro-crack technology in the overhauling of pavement structure of Cangzhou Wuqiao Section of National Highway 104, with the help of software analysis and indoor test, discusses the possibility of practical application of the research content. The comparison and analysis between the measured data of the test road and the simulation results of the software provide a reliable basis for the extension, application and research of the micro-crack technology in practical engineering.
【學(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U416.214

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