本文選題：風積沙 + 基底處理技術(shù)�。� 參考：《長安大學》2014年碩士論文

【摘要】：內(nèi)蒙古地區(qū)沙漠分布廣泛，隨著高等級公路的大量修建，筑路材料的問題日益突出，同時還存在著地表常年及季節(jié)性積水、土壤鹽漬化等不良地基問題。國內(nèi)對于風積沙的路用性能和不良地基處理技術(shù)有著廣泛深入的研究，然而利用風積沙材料處理積水地段公路路基基底的研究尚少，工程中有應用但缺乏理論分析和技術(shù)指南。本文以河套地區(qū)省道212線五原至劉召段一級公路工程為依托，針對沿線低洼積水路段的路基基底處理技術(shù)進行系統(tǒng)研究，為風積沙應用于基底處理提供了理論支撐，拓寬了風積沙的應用途徑，對內(nèi)蒙地區(qū)的公路建設和沙害防治有著重要意義。 本文首先進行了內(nèi)蒙古風積沙特性和積水地段處治方案研究，通過參閱大量文獻和項目試驗資料，總結(jié)出內(nèi)蒙古風積沙的物理特性、化學特性和力學特性；對工程沿線低洼積水路段進行調(diào)查，分析了風積沙處理不良路基基底的可行性，在原方案的基礎(chǔ)上，優(yōu)化提出了碎石渣墊層、風積沙墊層、風積沙墊層加鋪土工格室三種基底處治方案。其次，采用ABAQUS軟件建立風積沙路基有限元模型，得出換填厚度，路堤高度、邊坡坡度、包邊土厚度三種結(jié)構(gòu)參數(shù)和風積沙、地基土、包邊土三種材料力學參數(shù)對路基沉降和穩(wěn)定性的影響規(guī)律，推薦出了河套地區(qū)積水地段風積沙路基適宜結(jié)構(gòu)體系；對三種方案的試驗路路基進行了沉降計算和邊坡穩(wěn)定性分析，綜合對比其處治效果，從理論上驗證了風積沙處理積水地段路基基底的可行性。最后結(jié)合實體工程施工及檢測資料，對碎石渣、風積沙、土工格室三種基底處治方案的施工工藝和質(zhì)量控制進行了技術(shù)總結(jié)；在試驗路段埋設沉降板并持續(xù)觀測獲得風積沙路基分層沉降數(shù)據(jù)，對三種方案的路基沉降規(guī)律進行了分析和評價。實測結(jié)果表明，，經(jīng)三種方案處理后的路基工后沉降滿足規(guī)范要求，處治效果良好。
[Abstract]:The desert is widely distributed in Inner Mongolia. With the construction of high grade highway, the problem of road building material is becoming more and more serious. At the same time, there are many problems such as perennial and seasonal water accumulation, soil salinization and so on. In our country, the road performance of eolian sand and the technology of bad foundation treatment have been studied extensively and deeply. However, there is little research on the treatment of highway subgrade base with eolian sand material, and there is a lack of theoretical analysis and technical guidance in engineering. Based on the first class highway project from Wuyuan to Liuzhao section of provincial highway 212 in Hetao area, this paper makes a systematic study on subgrade basement treatment technology of low-lying waterlogged section along the route, which provides theoretical support for the application of eolian sand to base treatment. The application of eolian sand is widened, which is of great significance to highway construction and sand damage prevention in Inner Mongolia. In this paper, the characteristics of eolian sand in Inner Mongolia and the treatment scheme of hydrological area are studied. The physical, chemical and mechanical properties of eolian sand in Inner Mongolia are summarized by referring to a large number of documents and project test data. Based on the investigation of low-lying waterlogged sections along the engineering line, the feasibility of aeolian sand treatment of bad subgrade base is analyzed. On the basis of the original scheme, the gravel slag cushion and aeolian sand cushion are optimized. There are three kinds of basement treatment schemes for wind sand cushion overlay geogrid room. Secondly, the finite element model of eolian sand subgrade is established by using ABAQUS software, and three structural parameters, such as replacement fill thickness, embankment height, slope gradient, embankment soil thickness and aeolian sand, foundation soil are obtained. The influence of mechanical parameters of three kinds of materials on the settlement and stability of embankment is studied. The suitable structure system of aeolian sand roadbed in hydrological section of Hetao area is recommended, and the settlement calculation and slope stability analysis of the roadbed of three schemes are carried out. Compared with the treatment effect, the feasibility of treatment of subgrade base in hydrological section by eolian sand is verified theoretically. Finally, the construction technology and quality control of three kinds of basement treatment schemes, such as gravel slag, eolian sand and geogrid room, are summarized based on the construction and inspection data of solid engineering. The subgrade settlement data of eolian sand subgrade were obtained by continuous observation in the experimental section, and the subgrade settlement law of three schemes was analyzed and evaluated. The measured results show that the settlement of the roadbed after construction meets the requirements of the code, and the treatment effect is good.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U416.1

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