本文選題：水泥穩(wěn)定碎石　切入點：抗壓回彈模量　出處：《哈爾濱工業(yè)大學》2015年碩士論文

【摘要】：水泥穩(wěn)定碎石基層由于具有較好的強度和耐久性、較高的承載能力和整體穩(wěn)定性,目前在我國高速公路建設中應用廣泛。在我國,90%以上的各等級公路基層采用石灰粉煤灰以及水泥穩(wěn)定類等半剛性材料。但水泥穩(wěn)定碎石基層也存在著一些缺點:比如對重載敏感性大、排水性能差、容易收縮開裂、表面容易沖刷等。北方季凍地區(qū)地區(qū)具有全年低溫時間長、冬季漫長寒冷、寒暑變化劇烈、早晚溫差大的氣候特點。這樣的氣候環(huán)境影響水泥穩(wěn)定碎石基層材料的路用性能。水泥穩(wěn)定基層在初冬和春融期經(jīng)常處于凍融循環(huán)狀態(tài)。因此本文對該地區(qū)水泥穩(wěn)定碎石基層在凍融循環(huán)作用下的力學性能進行了相關(guān)的試驗分析研究。本文將參照相關(guān)試驗規(guī)程進行室內(nèi)試驗,制備并養(yǎng)生試件,進行凍融循環(huán),并測定材料在凍融循環(huán)之后的力學性能的變化情況,處理并分析得到的試驗數(shù)據(jù),研究力學性能變化規(guī)律,進而研究力學性能變化對路面結(jié)構(gòu)的影響,具體的工作包括以下幾點:凍融作用下水泥穩(wěn)定碎石力學性能變化規(guī)律。從確定水泥穩(wěn)定碎石原材料的技術(shù)性質(zhì)入手,確定試驗條件下的最佳含水量和最大干密度,并以此為依據(jù)通過試驗確定水泥劑量。制備并養(yǎng)生圓柱式試件,進行凍融循環(huán)試驗。以頂面法確定材料的抗壓回彈模量并進行劈裂試驗,并對試驗結(jié)果進行分析處理,找出其變化規(guī)律。凍融循環(huán)對水泥穩(wěn)定碎石疲勞性能的影響。制備并養(yǎng)生水泥穩(wěn)定碎石材料中梁式試件,進行凍融循環(huán)試驗。到規(guī)定的凍融次數(shù)后,測定材料的彎拉強度,在此基礎上進行材料的疲勞試驗。分析并處理得到的實驗數(shù)據(jù),總結(jié)水泥穩(wěn)定碎石材料在不同凍融循環(huán)次數(shù)下疲勞壽命的變化情況,得到不同保證率下的疲勞方程。凍融循環(huán)對水泥穩(wěn)定碎石基層路面結(jié)構(gòu)的影響�；谇懊娴玫降乃喾�(wěn)定碎石基層在不同凍融循環(huán)次數(shù)作用下的抗壓回彈模量以及劈裂強度,借助路面結(jié)構(gòu)分析軟件處理相關(guān)數(shù)據(jù),研究力學性能變化對路面各結(jié)構(gòu)層層底拉應力以及彎沉的影響,進而分析對整個路面結(jié)構(gòu)所帶來的影響。
[Abstract]:Cement stabilized crushed stone base is widely used in highway construction in China because of its good strength and durability, high bearing capacity and overall stability.Lime fly ash and cement stabilizer are used as semi-rigid materials in more than 90% of highway bases in China.But there are some disadvantages in cement stabilized macadam base, such as high sensitivity to heavy load, poor drainage performance, easy shrinkage and cracking, easy surface erosion and so on.The seasonal freezing area in northern China is characterized by long low temperature, long and cold winter, sharp changes in cold and summer heat, and large temperature difference in the morning and evening.This climate affects the road performance of cement-stabilized macadam base material.Cement stabilized base is often in the state of freeze-thaw cycle in early winter and spring thawing period.In this paper, the mechanical properties of cement stabilized macadam base under freeze-thaw cycle are studied.In this paper, laboratory tests will be carried out according to the relevant test procedures. The samples will be prepared and preserved, and the freeze-thaw cycles will be carried out. The mechanical properties of the materials after freeze-thaw cycles will be measured, and the experimental data obtained will be processed and analyzed.The change law of mechanical properties and the influence of mechanical properties on pavement structure are studied. The specific work includes the following points: the change law of mechanical properties of cement stabilized macadam under freeze-thaw action.Based on the determination of the technical properties of the raw materials of cement stabilized crushed stone, the optimum moisture content and the maximum dry density under the test conditions are determined, and the cement dosage is determined on the basis of the tests.The cylindrical specimen was prepared and kept in good health, and the freeze-thaw cycle test was carried out.The elastic modulus of the material was determined by the top surface method, and the splitting test was carried out. The experimental results were analyzed and treated to find out the variation law.Effect of freeze-thaw cycle on fatigue performance of cement stabilized crushed stone.The beam specimen of cement stabilized macadam was prepared and tested by freeze-thaw cycle test.After the specified freeze-thaw times, the flexural tensile strength of the material was measured, and the fatigue test of the material was carried out on this basis.By analyzing and processing the experimental data, the changes of fatigue life of cement stabilized macadam under different freeze-thaw cycles are summarized, and the fatigue equations under different guarantee rates are obtained.The influence of freeze-thaw cycle on pavement structure of cement stabilized crushed stone base course.Based on the modulus of resilience and splitting strength of cement stabilized macadam base under different freeze-thaw cycles, the pavement structure analysis software is used to process the relevant data.The influence of mechanical properties on the tensile stress and deflection of each layer of pavement structure is studied, and the influence on the whole pavement structure is analyzed.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U414

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