本文關(guān)鍵詞： 粉土 孔隙率 飽和度 土壓力 熱物理參數(shù)　出處：《太原理工大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：粉土在我國(guó)廣泛分布。因其特殊的工程性質(zhì),在地基、路基中作為填土材料,粉土被認(rèn)為是最差的材料之一。由于山西地區(qū)特殊的地形、地貌,在道路建設(shè)和工程建設(shè)中常采用填土技術(shù)。而填土的擊實(shí)質(zhì)量,直接關(guān)系到上部結(jié)構(gòu)的安全和正常運(yùn)營(yíng)。同時(shí),建設(shè)地下交通體系是有效地緩解城市交通擁擠和用地短缺的重要途徑之一。因此,針對(duì)粉土擊實(shí)特性的研究,擊實(shí)過(guò)程中的土中應(yīng)力特性研究以及準(zhǔn)確獲得擊實(shí)粉土的熱物理性質(zhì)的研究,不僅補(bǔ)充完善了巖土材料擊實(shí)性能和熱物理性質(zhì)的認(rèn)識(shí),而且對(duì)解決工程實(shí)際問(wèn)題具有重要意義。為此,本文針對(duì)山西地區(qū)的粉土進(jìn)行了室內(nèi)擊實(shí)試驗(yàn),分析了擊實(shí)能、含水量、擊實(shí)次數(shù)和土層厚度對(duì)粉土擊實(shí)過(guò)程中的土壓力和擊實(shí)錘的沖擊力的影響;對(duì)擊實(shí)后的粉土測(cè)定熱物理參數(shù),分析了孔隙率和飽和度與三個(gè)熱物理參數(shù)的關(guān)系。試驗(yàn)結(jié)果表明:(1)在同一擊實(shí)能下,分5層擊實(shí)時(shí)土樣的最優(yōu)含水量和最大干密度均略大于分3層擊實(shí)時(shí)的。(2)無(wú)論擊實(shí)含水量為多少,擊實(shí)第一層土?xí)r,實(shí)測(cè)的土中壓力隨著擊實(shí)次數(shù)的增加而提高,在最后一擊時(shí)達(dá)到最大值。而擊實(shí)錘的沖擊力在含水量與最優(yōu)含水量相差2%的范圍內(nèi),均不發(fā)生變化,維持在12.5k N左右。對(duì)第二層或第三層土進(jìn)行擊實(shí)時(shí),擊實(shí)含水量在最優(yōu)含水量的干側(cè),土中的壓力隨擊實(shí)次數(shù)增加而提高,但是提高幅度小于第一層時(shí);在最優(yōu)含水量的濕側(cè)擊實(shí)時(shí),土中的壓力從某一擊開(kāi)始不再增加,保持不變。隨著含水量的增加,每層土的最終土壓力值和最大擊實(shí)錘沖擊力先增加后減小。隨著擊實(shí)能的增加,第一層土的最終土壓力值逐漸增加;對(duì)第二層土或第三層土進(jìn)行擊實(shí)時(shí),在最優(yōu)含水量和最優(yōu)含水量的偏干側(cè),每層土的最終土壓力值在增加;而在最優(yōu)含水量的偏濕側(cè),每層土的最終土壓力值逐漸減小。在最優(yōu)含水量的偏干側(cè),第一層土的最大擊實(shí)錘沖擊力隨著擊實(shí)能的增大幾乎不變,第二至五層土的最大沖擊力有所增加。土壓力隨著擊實(shí)厚度的增加以指數(shù)函數(shù)的形式降低。(3)土樣的導(dǎo)熱系數(shù)和比熱容隨著孔隙率的增大表現(xiàn)為線(xiàn)性減小,導(dǎo)溫系數(shù)則逐漸增大。隨著飽和度的增加,土樣的導(dǎo)熱系數(shù)和比熱容曲線(xiàn)均呈現(xiàn)先上升再下降的趨勢(shì);導(dǎo)溫系數(shù)則相反,呈現(xiàn)先降低后增加的趨勢(shì)。另外,熱物理參數(shù)與孔隙率、飽和度均具有良好的相關(guān)性。
[Abstract]:Silt is widely distributed in China. Because of its special engineering properties, silt is regarded as one of the worst materials in foundation and roadbed. Fill technology is often used in road construction and engineering construction. The compaction quality of fill is directly related to the safety and normal operation of superstructure. The construction of underground traffic system is one of the important ways to effectively alleviate urban traffic congestion and land shortage. Therefore, the study on the characteristics of silt compaction. The study of the stress characteristics in the compaction process and the accurate obtaining of the thermophysical properties of the compacted silt not only complements the understanding of the compaction properties and thermophysical properties of the rock and soil materials. And it is of great significance to solve the practical problems of engineering. Therefore, this paper carried out laboratory compaction test for silt in Shanxi area, and analyzed compaction ability and water content. The influence of compaction times and soil thickness on soil pressure and impact force of compaction hammer during silt compaction; The relationship between porosity and saturation and three thermophysical parameters is analyzed for the silt determined by compaction. The experimental results show that the porosity and saturation are under the same compaction energy. The optimal moisture content and maximum dry density of the soil samples in 5 layers are slightly larger than that of the real time soil samples in 3 layers.) no matter how much the compacted water content is, the first layer soil is compacted. The measured pressure in the soil increases with the increase of compaction times and reaches the maximum at the last strike, while the impact force of the hammer does not change in the range of 2% between the water content and the optimum water content. The compaction water content is on the dry side of the optimum water content, and the pressure in the soil increases with the increase of compaction times. But when the increase is less than the first layer; At the wet side strike of the optimal water content, the pressure in the soil does not increase from a certain strike, and remains unchanged. With the increase of water content. The final earth pressure and the maximum hammer impact force of each layer of soil firstly increase and then decrease. With the increase of compaction energy, the final earth pressure value of the first layer of soil increases gradually. When the second layer soil or the third layer soil is hit in real time, the final soil pressure of each layer is increasing on the dry side of the optimal water content and the optimal water content. On the wet side of the optimal moisture content, the final soil pressure of each layer of soil gradually decreases. On the dry side of the optimum moisture content, the maximum impact force of the first layer of soil is almost unchanged with the increase of compaction energy. The maximum impact force of the second to fifth layer soil increases. The soil pressure decreases with the compaction thickness by exponential function.) the thermal conductivity and specific heat capacity of the soil sample decrease linearly with the increase of porosity. With the increase of saturation, the thermal conductivity and specific heat capacity curve of soil samples increased first and then decreased. On the contrary, the thermal conductivity coefficient decreased first and then increased. In addition, there was a good correlation between thermal physical parameters and porosity and saturation.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU411

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