本文選題：路基土 + 擊實(shí)　； 參考：《長(zhǎng)沙理工大學(xué)》2014年碩士論文

【摘要】：路基作為路面結(jié)構(gòu)的基礎(chǔ),不僅承受著自身填土的重力和上覆路面結(jié)構(gòu)帶來(lái)的重力,還需要承受路面上部傳遞下來(lái)的行車荷載。一直以來(lái),道路工程研究中存在著“重路面,輕路基”的現(xiàn)象,導(dǎo)致路基建造技術(shù)等相關(guān)領(lǐng)域的研究相對(duì)滯后。路基施工過(guò)程中路基土的含水率對(duì)路基填筑質(zhì)量影響很大,處理不當(dāng)易導(dǎo)致后期的路面結(jié)構(gòu)產(chǎn)生不均勻沉降、車轍、開(kāi)裂等病害,嚴(yán)重影響道路的路用性能和使用壽命。我國(guó)南方濕熱地區(qū)路基土濕度較大,研究南方濕熱地區(qū)高速公路典型路基土的干法、濕法擊實(shí)試驗(yàn)差異性及尋找不同路基土對(duì)應(yīng)于各自合理的施工含水率對(duì)指導(dǎo)路基路面設(shè)計(jì)具有重要意義。本文以在建的南昌至樟樹(shù)高速公路改擴(kuò)建工程為依托,針對(duì)南方濕熱地區(qū)的典型路基土,系統(tǒng)展開(kāi)了路基土的室內(nèi)外試驗(yàn)研究。本文的主要研究?jī)?nèi)容一共分為兩塊：第一,探討南方濕熱氣候條件下不同種類的典型路基土干法、濕法擊實(shí)試驗(yàn)的最佳含水率之間的關(guān)系,可為今后公路工程路基施工提供更多更可靠的依據(jù)和規(guī)律。在昌樟高速改擴(kuò)建路段選取典型的三種類型土樣：一般黏土、高液限土、砂性土,分別進(jìn)行了土的篩分試驗(yàn)、液塑限試驗(yàn)、干法、濕法擊實(shí)試驗(yàn),分析了試樣的基本土質(zhì)特征和工程特性,得到了三種南方典型高速公路路基土的干法、濕法擊實(shí)試驗(yàn)對(duì)應(yīng)最佳含水率之間的關(guān)系。第二,依據(jù)擊實(shí)試驗(yàn)獲得的最佳含水率,按2%～3%的含水率遞增(減),進(jìn)行路基土的強(qiáng)度(CBR)試驗(yàn)研究,得到相應(yīng)路基土的CBR值,評(píng)價(jià)了路基土的路用性能。在此基礎(chǔ)之上,提出了南方濕熱地區(qū)三種典型路基土在滿足工程要求前提下,路堤施工對(duì)應(yīng)的含水率范圍,并結(jié)合試驗(yàn),分析了不同種類土的最佳含水率與CBR強(qiáng)度值之間存在的關(guān)系。本文通過(guò)對(duì)南方高速公路三種典型路基土的相關(guān)研究,具有以下創(chuàng)新點(diǎn)：通過(guò)試驗(yàn)結(jié)果分析,總結(jié)并得出了三種土干法、濕法擊實(shí)試驗(yàn)最佳含水率間的關(guān)系,以及滿足工程要求的施工含水率范圍。研究成果對(duì)南方地區(qū)典型路基土填筑路堤具有指導(dǎo)意義。
[Abstract]:As the foundation of pavement structure, subgrade not only bears the gravity of its own fill and overlying pavement structure, but also needs to bear the traffic load transferred from the upper part of the pavement. The phenomenon of "heavy road surface, light roadbed" has been existed in road engineering research all the time, which leads to the relative lag of research on subgrade construction technology and other related fields. In the process of subgrade construction, the moisture content of subgrade soil has a great influence on the quality of subgrade filling, and improper treatment will lead to uneven settlement, rutting, cracking and other diseases of the pavement structure in the later stage, which seriously affects the road performance and service life of the road. The dry method of typical subgrade soil in south China is studied in this paper. The difference of wet compaction test and the search for different subgrade soil corresponding to their respective reasonable construction moisture content are of great significance to guide the design of subgrade and pavement. Based on the reconstruction and extension project of Nanchang-Zhangshu Expressway under construction, the indoor and outdoor test of subgrade soil is carried out systematically in this paper, aiming at typical subgrade soil in southern humid and hot area. The main contents of this paper are divided into two parts: first, the relationship between the optimum moisture content of different types of typical subgrade soil dry method and wet compaction test is discussed. It can provide more reliable basis and rule for roadbed construction of highway engineering in the future. Three typical types of soil samples were selected in Changzhang high-speed reconstruction and extension section: general clay, high liquid limit soil and sandy soil. Soil screening test, liquid-plastic limit test, dry method and wet compaction test were carried out respectively. The basic soil properties and engineering characteristics of the samples are analyzed, and the relationship between the wet compaction test and the optimum moisture content of three typical subgrade soils in the south of China is obtained. Secondly, according to the optimum moisture content obtained by compaction test, the CBR value of subgrade soil is obtained by increasing the moisture content of 2% and 3%, and the road performance of roadbed soil is evaluated. On this basis, three typical subgrade soils in southern humid and hot areas are put forward, and the corresponding water content range of embankment construction under the premise of meeting the engineering requirements is put forward, and combined with the test, The relationship between the optimum moisture content of different soils and the CBR strength is analyzed. Through the research on three typical subgrade soils of Nanfang Expressway, this paper has the following innovations: through the analysis of the test results, the relationship between the optimum moisture content of the three kinds of soil dry method and wet compaction test is summarized and obtained. And the scope of construction moisture content to meet the engineering requirements. The research results are of guiding significance for embankment filling with typical subgrade soil in southern China.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U416.1

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