本文選題：泥巖 + 路堤　； 參考：《合肥工業(yè)大學(xué)》2017年碩士論文

【摘要】：泥巖是一種介于硬巖與土體之間的材料,在我國范圍內(nèi)廣泛分布,它具有抗壓強度低、易風(fēng)化、遇水易軟化、崩解,填筑密實度對含水率敏感等特點,對道路修建極其不利。因此,本文針對泥巖特性、泥巖路堤降雨入滲及相應(yīng)處治措施進行研究。本文通過理論分析和試驗研究,開展了如下工作:(1)對泥巖試樣進行室內(nèi)試驗研究,由試驗結(jié)果知,泥巖滿足路堤填料的承載比要求,可以作為路堤填料,但泥巖屬于軟化巖石,遇水后強度降低,因此選取泥巖作為路堤填料需要特別注意泥巖的防水。(2)對泥巖進行改良試驗研究,利用水泥或者石灰進行泥巖的改良能增強泥巖的水穩(wěn)定性及承載比,石灰不僅價格便宜,而且石灰改良土存在最佳石灰摻入比,推薦選用石灰進行泥巖的改良。(3)采用路堤一維土體滲流模型結(jié)合持續(xù)降雨入滲模型(FDEM)的邊界條件,基于全隱式有限差分法,計算出泥巖路堤土體的含水率。試驗段檢測值與理論值具有較高的相似性,證明了此種路堤含水率計算方法,具有良好的適用性和科學(xué)性。由計算結(jié)果可知,粘土封層的鋪設(shè)能降低路堤表層土體降雨入滲速率,減小降雨對路堤含水率的影響深度。提出了兩種計算粘土封層阻滲量的方法,阻滲量計算結(jié)果表明,粘土封層的鋪設(shè)能夠?qū)⒋罅康挠晁韪粼谀鄮r路堤之外,保護泥巖路堤。(4)在泥巖路堤修筑現(xiàn)場進行粘土封層的鋪筑試驗,定量研究在同次降雨條件下,粘土封層厚度、路堤深度、泥巖風(fēng)化程度、晾曬天數(shù)等因素對路堤含水率的影響。針對安徽省泥巖路堤修筑提出合理的粘土封層鋪設(shè)厚度。通過統(tǒng)計非線性回歸分析,提出多因素與路堤含水率之間的預(yù)估模型。據(jù)此模型可計算出最佳填筑含水率狀態(tài)下泥巖所處的路堤深度,降雨過后據(jù)此進行翻曬,節(jié)約施工時間及工程量。(5)選取試驗段進行泥巖路堤沖擊碾壓試驗研究,結(jié)果表明,沖擊碾壓遍數(shù)以20遍為宜,路堤每鋪筑120cm進行一次沖擊碾壓,能夠起到良好的效果。
[Abstract]:Mudstone is a kind of material between hard rock and soil, which is widely distributed in our country. It has the characteristics of low compressive strength, easy weathering, easy softening when encountered with water, collapse and sensitivity of filling density to water content, which is extremely disadvantageous to road construction. Therefore, the characteristics of mudstone, rainfall infiltration of mudstone embankment and corresponding treatment measures are studied in this paper. Through theoretical analysis and experimental study, the following work has been carried out in this paper: (1) the laboratory test of mudstone samples shows that mudstone meets the loading ratio requirement of embankment filler and can be used as embankment filler, but mudstone belongs to softening rock. The strength of mudstone decreases after water treatment, so it is necessary to pay special attention to the waterproofing of mudstone when selecting mudstone as embankment filler. (2) improving mudstone by using cement or lime to improve mudstone can enhance the water stability and bearing ratio of mudstone. Lime is not only cheap in price, but also has the best lime mixing ratio. Lime is recommended for mudstone improvement. (3) one dimensional seepage model of embankment and boundary condition of continuous rainfall infiltration model (FDEM) are adopted. Based on the fully implicit finite difference method, the moisture content of mudstone embankment is calculated. There is a high similarity between the measured values and the theoretical values of the test section, which proves that the method of calculating the moisture content of the embankment has good applicability and scientific character. From the results of calculation, it can be seen that the laying of clay seal layer can reduce the infiltration rate of the surface soil of the embankment and the depth of the influence of the rainfall on the moisture content of the embankment. Two methods for calculating the impermeability of clay sealing layer are presented. The calculation results show that the laying of clay seal layer can block a large amount of Rain Water outside the mudstone embankment. Protection of mudstone embankment. (4) Clay sealing test was carried out in the site of mudstone embankment construction. The effects of clay sealing layer thickness, embankment depth, mudstone weathering degree and drying days on embankment moisture content were quantitatively studied under the same rainfall condition. According to the construction of mudstone embankment in Anhui Province, a reasonable thickness of clay seal layer is put forward. Through statistical nonlinear regression analysis, the prediction model between multi-factors and embankment moisture content is proposed. According to the model, the depth of mudstone embankment under the condition of optimum water content can be calculated, and the depth of mudstone embankment can be calculated after rainfall, and the construction time and engineering quantity can be saved. (5) the impact rolling test of mudstone embankment is carried out by selecting the test section, and the results show that, The best impact compaction number is 20 times, and the impact compaction for every 120cm paving embankment can have a good effect.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U416.1

【參考文獻】

相關(guān)期刊論文 前10條

1 朱青青;苗強強;陳正漢;姚志華;章峻豪;;考慮基質(zhì)勢影響的非飽和土水分運移規(guī)律測試系統(tǒng)研制[J];巖土工程學(xué)報;2016年S2期

2 馬麗娜;嚴松宏;王起才;余云燕;張戎令;;客運專線無碴軌道泥巖地基原位浸水膨脹變形試驗[J];巖石力學(xué)與工程學(xué)報;2015年08期

3 王成華;萬正義;張成林;;非飽和砂土坡面降雨非正交入滲試驗與數(shù)值模擬研究[J];巖土工程學(xué)報;2015年08期

4 劉偉;李銀平;楊春和;馬洪嶺;施錫林;黃小蘭;;深部泥巖滲透率測試方法及數(shù)據(jù)適用性分析[J];巖土力學(xué);2014年S1期

5 周建烽;王均星;陳煒;;非飽和非穩(wěn)定滲流作用下邊坡穩(wěn)定的有限元塑性極限分析下限法[J];巖土工程學(xué)報;2014年12期

6 劉杰;姚海林;盧正;胡夢玲;董啟朋;;非飽和土路基毛細作用的數(shù)值與解析方法研究[J];巖土力學(xué);2013年S2期

7 王改玲;王青杵;石生新;;晉北黃土區(qū)降雨特征及其對坡地土壤侵蝕的影響[J];水土保持學(xué)報;2013年01期

8 王丹;劉琳;張小曼;;灰色關(guān)聯(lián)度法在煤礦本質(zhì)安全評價中的改進及應(yīng)用[J];中國安全生產(chǎn)科學(xué)技術(shù);2013年01期

9 柴肇云;郭衛(wèi)衛(wèi);陳維毅;康天合;;泥巖孔裂隙分布特征及其對吸水性的影響[J];煤炭學(xué)報;2012年S1期

10 王協(xié)群;張有祥;鄒維列;熊海帆;;降雨入滲條件下非飽和路堤變形與邊坡的穩(wěn)定數(shù)值模擬[J];巖土力學(xué);2010年11期

，

本文編號：2093315