【摘要】：路基是道路的主要承重基礎(chǔ),路基質(zhì)量好壞直接關(guān)系到道路使用性能及壽命,正確評定路基質(zhì)量是整個道路質(zhì)量驗收中非常關(guān)鍵的環(huán)節(jié)。目前我國評定路基質(zhì)量主要指標是壓實度和彎沉,路基壓實度測試方法目前已成熟,彎沉評定標準取不利季節(jié)的彎沉值。實際上大部分工程是在非不利季節(jié)修筑完成,如果用非不利季節(jié)測定的路基彎沉值來評定路基質(zhì)量,勢必會達不到預(yù)期效果,故對路基彎沉進行季節(jié)修正很有必要。路基彎沉與路基回彈模量存在較好的相關(guān)關(guān)系。目前國內(nèi)外關(guān)于路基彎沉季節(jié)修正的研究,均先研究路基彎沉與路基回彈模量之間的關(guān)系,根據(jù)路基回彈模量的變化規(guī)律來修正路基彎沉。路基彎沉季節(jié)修正方法研究均只是針對含水量(稠度)這一個主要的影響因素,并未考慮壓實度對路基回彈模量的影響。這樣路基回彈模量的季節(jié)修正公式雖然能反映回彈模量的變化規(guī)律,但是只考慮單個因素,其修正結(jié)果并不是很理想。本文采用湖南常德石門某道路工程路基彎沉與路基回彈模量檢測數(shù)據(jù),對比分析規(guī)范中推薦的路基彎沉與路基回彈模量相互轉(zhuǎn)化的經(jīng)驗公式和理論公式,找出與工程實際相關(guān)性高的轉(zhuǎn)化公式;然后針對湖南地區(qū)紅黏土室內(nèi)回彈模量試驗,研究路基回彈模量的影響因素,采用灰關(guān)聯(lián)法分析比較含水量、壓實度對回彈模量的影響程度。分析結(jié)果表明,含水量對路基回彈模量的影響程度大于壓實度;考慮多個影響因素的影響,采用含水量與壓實度聯(lián)合修正路基回彈模量,推導(dǎo)出含水量與壓實度聯(lián)合修正路基回彈模量公式;結(jié)合規(guī)范中推薦路基彎沉與路基回彈模量轉(zhuǎn)換的理論計算公式,通過理論推導(dǎo)出含水量與壓實度聯(lián)合修正路基驗收彎沉公式。對比分析規(guī)范中推薦路基驗收彎沉修正方法、含水量(稠度)比路基驗收彎沉修正方法、含水量與壓實度聯(lián)合修正路基驗收彎沉方法的修正數(shù)據(jù),結(jié)果表明采用含水量與壓實度聯(lián)合修正路基驗收彎沉的效果更好。本文建立的路基驗收彎沉季節(jié)修正公式能更好的反映路基彎沉變化規(guī)律,其路基驗收彎沉季節(jié)修正結(jié)果能更好的指導(dǎo)實際工程施工;最后制定了一套適合路基彎沉季節(jié)驗收的方法,使本文的研究成果能為實際施工服務(wù)。
[Abstract]:The subgrade is the main bearing foundation of the road, and the quality of the roadbed is directly related to the performance and service life of the road. The correct evaluation of the subgrade quality is the key link in the acceptance of the whole road quality. At present, the main index of subgrade quality evaluation in China is compaction degree and deflection. The test method of roadbed compaction degree is mature at present. In fact, most of the projects are completed in the non-unfavorable season. If the subgrade deflection value measured in the non-unfavorable season is used to evaluate the subgrade quality, it will not achieve the expected effect, so it is necessary to carry on the seasonal correction to the subgrade deflection. There is a good correlation between subgrade deflection and subgrade resilience modulus. At present, the relationship between subgrade deflection and subgrade resilience modulus is studied in the domestic and foreign researches on subgrade deflection season correction, and the subgrade deflection is corrected according to the variation law of subgrade resilience modulus. The methods of subgrade deflection season correction are only aimed at the main influencing factor of water content (consistency), and the influence of compaction on subgrade resilience modulus is not considered. In this way, the seasonal correction formula of subgrade resilience modulus can reflect the variation law of resilience modulus, but only considering a single factor, the correction result is not very ideal. Based on the test data of subgrade deflection and subgrade resilience modulus of a road project in Changde Shimen, Hunan Province, the empirical and theoretical formulas for the mutual transformation of subgrade deflection and subgrade resilience modulus recommended in the code are compared and analyzed in this paper. To find out the transformation formula which is highly related to the engineering practice, and then to study the influencing factors of subgrade resilience modulus for the indoor elastic modulus test of red clay in Hunan area, and to analyze and compare the water content by grey correlation method. The influence of compaction on resilience modulus. The results show that the influence of water content on subgrade resilience modulus is greater than that of compaction, considering the influence of many factors, the subgrade resilience modulus is modified by the combination of water content and compaction degree. The formula for correcting the modulus of resilience of subgrade with the combination of water content and compaction degree is deduced, and the theoretical formula for the conversion of subgrade deflection and modulus of resilience of subgrade is recommended in the code. The formula of water content and compaction is derived to modify the roadbed acceptance deflection. The correction method of roadbed acceptance deflection, the correction method of water content (consistency) compared with the method of roadbed acceptance deflection correction, and the correction data of roadbed acceptance deflection method with water content and compaction are recommended in the comparative analysis code. The results show that the combination of water content and compaction is better for correcting the roadbed acceptance deflection. The subgrade acceptance deflection seasonal correction formula established in this paper can better reflect the subgrade deflection change law, and its subgrade acceptance deflection season correction results can better guide the actual engineering construction. Finally, a set of methods suitable for the seasonal acceptance of subgrade deflection are developed, which makes the research results of this paper serve the actual construction.
【學(xué)位授予單位】：湖南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U416.1

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