本文選題：級配碎石 + 摻水泥��； 參考：《西南交通大學(xué)》2015年碩士論文

【摘要】：哈大高鐵客運(yùn)專線是處于東北嚴(yán)寒地區(qū)的無砟軌道,是國家“十一五”規(guī)劃的重點(diǎn)工程,其所經(jīng)地段廣泛地分布著季節(jié)性凍土。因此,針對哈大線路基工程,如何減少其路基凍脹量至標(biāo)準(zhǔn)范圍內(nèi),是哈大客運(yùn)專線面臨的一個(gè)重要難題。文獻(xiàn)[2]已經(jīng)得出了級配碎石摻入水泥能夠減少哈大客運(yùn)專線路基的凍脹量的結(jié)論,并得出了水泥的合理摻量在5%～7%。在前面“路基不同細(xì)粒含量級配碎石摻水泥凍脹特性研究”的基礎(chǔ)上,本文對級配碎石摻水泥這種材料的力學(xué)特性、凍融循環(huán)后的強(qiáng)度損失以及彎拉疲勞性能進(jìn)行了分析研究。分析了水泥含量、細(xì)粉含量、減水劑含量對級配碎石摻水泥的力學(xué)特性影響規(guī)律,強(qiáng)度隨著齡期的增長規(guī)律,各強(qiáng)度之間的關(guān)系規(guī)律；分析了水泥含量、細(xì)粉含量對級配碎石摻水泥凍融循環(huán)后的力學(xué)性能的影響規(guī)律；分析了級配碎石摻水泥的彎拉疲勞方程。主要研究內(nèi)容及試驗(yàn)結(jié)果如下：(1)對級配碎石摻水泥的力學(xué)特性研究,結(jié)果表明水泥和細(xì)粉均是影響級配碎石摻水泥強(qiáng)度的關(guān)鍵性因素,其強(qiáng)度隨水泥用量增大而增大、隨細(xì)粉含量增大而降低、減水劑摻入可適當(dāng)減少用水量,提高強(qiáng)度。在級配碎石摻水泥的強(qiáng)度齡期方面：28d強(qiáng)度與7d強(qiáng)度符合相關(guān)系數(shù)較高的線性公式。在級配碎石摻水泥強(qiáng)度關(guān)系方面：其28d抗壓強(qiáng)度與彎拉強(qiáng)度符合相關(guān)系數(shù)較高的冪指數(shù)公式；壓折比k與抗壓強(qiáng)度符合相關(guān)系數(shù)較高的線性公式；劈拉強(qiáng)度與抗壓強(qiáng)度符合相關(guān)系數(shù)較高冪指數(shù)公式；彎拉強(qiáng)度與彎拉彈性模量符合相關(guān)系數(shù)較高的冪指數(shù)公式。(2)對級配碎石摻水泥的凍融循環(huán)力學(xué)特性研究,結(jié)果表明50次凍融循環(huán)后級配碎石摻水泥的質(zhì)量損失率在1.5%～3%之間,小于5%。在凍融循環(huán)后的抗壓強(qiáng)度損失方面：50次循環(huán)后的強(qiáng)度損失在10%-30%之間。水泥含量與細(xì)粉含量對級配碎石摻水泥強(qiáng)度損失的影響具有一定的波動性,但是仍具有一定的規(guī)律性。(3)對級配碎石摻水泥的彎拉疲勞性能研究,結(jié)果表明級配碎石摻水泥的彎拉疲勞壽命滿足雙參數(shù)Weibull分布,并通過數(shù)學(xué)模型結(jié)合試驗(yàn)數(shù)據(jù)建立了級配碎石摻水泥的彎拉疲勞試驗(yàn)方程。
[Abstract]:The high-speed passenger dedicated line of Harbin and Dalian is a ballastless track in the cold area of northeast China. It is the key project of the 11th Five-Year Plan of China, and its section is widely distributed with seasonal frozen soil. Therefore, how to reduce the frost heave to the standard range is an important problem faced by Ha-Da passenger dedicated Line. In reference [2], it has been concluded that graded crushed stone mixing with cement can reduce the frost heaving capacity of subgrade of Ha-Da passenger dedicated line, and that the reasonable cement content is 5% and 7%. On the basis of "study on Frost heaving characteristics of different Fine grained crushed Macadam admixed with cement in roadbed", the mechanical properties, strength loss and bending and tensile fatigue properties of graded crushed Macadam mixed with cement after freeze-thaw cycle are analyzed and studied in this paper. The effects of cement content, fine powder content and water reducing agent content on the mechanical properties of graded crushed stone cement are analyzed. The effect of fine powder content on the mechanical properties of graded macadam after freeze-thaw cycle was studied, and the flexural fatigue equation of graded macadam with cement was analyzed. The main contents and experimental results are as follows: (1) the mechanical properties of graded macadam mixed with cement are studied. The results show that both cement and fine powder are the key factors affecting the strength of graded macadam, and the strength increases with the increase of cement content. With the increase of fine powder content, the water consumption can be reduced and the strength can be increased. The ratio of 28d strength to 7d strength accords with the linear formula with high correlation coefficient in the strength age of graded macadam mixed with cement. In the relation of cement strength of graded crushed stone, 28d compressive strength and flexural strength accord with the power exponent formula with higher correlation coefficient, and the linear formula with high correlation coefficient between compression ratio k and compressive strength. Splitting tensile strength and compressive strength accord with higher power exponent formula, flexural tensile strength and flexural elastic modulus accord with power exponent formula with high correlation coefficient. The results show that the mass loss rate of graded crushed stone mixed with cement after 50 freeze-thaw cycles is between 1.5% and 3%, which is less than 5%. The loss of compressive strength after freezing and thawing cycles is between 10% and 30% after 50 cycles. The influence of cement content and fine powder content on the strength loss of graded macadam cement has certain fluctuation, but still has certain regularity. The results show that the flexural fatigue life of graded macadam cement meets the Weibull distribution of two parameters, and the flexural fatigue test equation of graded macadam cement is established by mathematical model combined with test data.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U414

【引證文獻(xiàn)】

相關(guān)期刊論文 前1條

1 周軍霞;;低水泥含量級配碎石凍脹特性試驗(yàn)研究[J];硅酸鹽通報(bào);2016年12期

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本文編號：1840972