本文關(guān)鍵詞：復(fù)雜環(huán)境因素關(guān)聯(lián)下路基平衡濕度狀態(tài)精細(xì)表征　出處：《重慶交通大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 路基濕度 基質(zhì)吸力 土-水特性曲線(xiàn) 預(yù)估模型

【摘要】：回彈模量和永久變形是瀝青路面“力學(xué)—經(jīng)驗(yàn)”設(shè)計(jì)法中表征路基力學(xué)性狀的重要參數(shù)，其值隨著路基濕度和溫度環(huán)境因素的變化而改變，因此，路面結(jié)構(gòu)設(shè)計(jì)應(yīng)充分考慮路基濕度實(shí)際所處狀態(tài)及變化特征。 本文采取文獻(xiàn)調(diào)研、數(shù)值模擬、現(xiàn)場(chǎng)調(diào)查、理論分析等多種技術(shù)手段，以“土-水特性曲線(xiàn)——基質(zhì)吸力——路基濕度——路基性能”為研究主線(xiàn)，詳細(xì)探討降雨環(huán)境和地下水位升降情況下路基濕度變化規(guī)律，建立了不同環(huán)境因素主導(dǎo)下的路基濕度預(yù)估模型，分析了路基濕度對(duì)路基性能的影響，主要研究工作如下： ①通過(guò)廣泛國(guó)內(nèi)外文獻(xiàn)調(diào)研，，結(jié)合路基濕度現(xiàn)場(chǎng)調(diào)研的結(jié)果，明確路基濕度在運(yùn)營(yíng)3-5年達(dá)到平衡，應(yīng)該以平衡濕度作為路基濕度設(shè)計(jì)狀態(tài)。綜合路基濕度來(lái)源及各種影響因素，將其歸并為氣候與地下水位兩大控制因素，氣候因素中大氣降雨占主導(dǎo)地位。 ②用SEEP/W軟件進(jìn)行數(shù)值模擬，詳細(xì)分析降雨強(qiáng)度、降雨歷時(shí)、路面類(lèi)型、路基路面裂隙條件下路基濕度的變化規(guī)律。結(jié)果表明：1）路面不透水條件下，土路肩、邊坡、中央分隔帶是雨水入滲的主要途徑，在路基內(nèi)部形成弧形擾動(dòng)區(qū)；2）降雨歷時(shí)一定條件下，擾動(dòng)范圍與降雨強(qiáng)度呈正比例函數(shù)關(guān)系，擾動(dòng)范圍路基土的體積含水量與降雨強(qiáng)度呈對(duì)數(shù)函數(shù)關(guān)系；3）降雨強(qiáng)度一定條件下，擾動(dòng)范圍路基土體積含水量與降雨歷時(shí)符合對(duì)數(shù)函數(shù)關(guān)系；4）路面透水情況下，受降雨影響最大的是路床和上路堤區(qū)域，下路堤區(qū)域所受影響較小，路面中心下路基濕度擾動(dòng)深度隨時(shí)間的增長(zhǎng)呈線(xiàn)性擴(kuò)散的規(guī)律；5）路基路面存在裂隙情況下，對(duì)于降雨強(qiáng)度小于材料滲透系數(shù)的無(wú)積水的降雨，整個(gè)非飽和路基濕度場(chǎng)沒(méi)有明顯變化；有積水的強(qiáng)降雨，非飽和路基滲流場(chǎng)將會(huì)發(fā)生顯著改變；6）路基裂隙周?chē)坊鶟穸葦_動(dòng)范圍隨著時(shí)間的增長(zhǎng)呈線(xiàn)性擴(kuò)散。 ③用SEEP/W軟件進(jìn)行數(shù)值模擬，詳細(xì)分析地下水位升降條件下路基濕度的變化規(guī)律。結(jié)果表明：1）在地下水位不變的情況下，隨著時(shí)間的延長(zhǎng)，地下水對(duì)路基濕度的擾動(dòng)范圍逐漸增大，最終趨于平衡，達(dá)到毛細(xì)上升最大高度；2）地下水對(duì)路基濕度場(chǎng)的影響范圍有限，壓實(shí)度為96%的粉質(zhì)粘土的毛細(xì)水最大上升高度為6.75m，擾動(dòng)距離隨時(shí)間的變化符合關(guān)系式D at2bt的規(guī)律；3）地下水位回落過(guò)程，路基土體積含水量與時(shí)間的符合關(guān)系式m ae btv c的規(guī)律。 ④根據(jù)路基濕度主要影響因素的不同，將路基劃分為3種型類(lèi)。分別提出了適合Ⅰ型類(lèi)路基濕度預(yù)估的TMI wPI模型和完善了預(yù)估Ⅲ型類(lèi)路基濕度的地下水位模型，給出了路基濕度預(yù)估的流程。 ⑤對(duì)3種土樣進(jìn)行室內(nèi)重復(fù)加載三軸試驗(yàn)，測(cè)試內(nèi)容包括路基土常規(guī)動(dòng)回彈模量、永久變形，結(jié)果表明：各類(lèi)路基土回彈模量對(duì)含水量變化非常敏感，同時(shí)含水率越高，永久變形越大。
[Abstract]:Resilient modulus and permanent deformation of asphalt pavement is "mechanical design experience" in suhgrade and mechanical properties of the important parameters, the value with the change of subgrade humidity and temperature environmental factors change, therefore, the pavement structure design should fully consider the actual state of the subgrade humidity and variation.
This paper adopts literature research, numerical simulation, field investigation, theoretical analysis of a variety of technical means, to the soil water characteristic curve, the matrix suction, the subgrade humidity - subgrade performance "as the main line, with changes of the subgrade humidity rainfall and underground water level lifting environment, established a prediction model of Subgrade humidity leading to different environmental factors the influence of humidity on Subgrade subgrade performance, the main research work is as follows:
Through extensive literature survey, combined with the subgrade humidity field investigation, clear the subgrade humidity in operation 3-5 years to reach equilibrium, should be to balance the subgrade humidity humidity as design state. Factors and various effects of subgrade humidity origin, they are merged into the climate and groundwater level two control factors, climate factors accounted for rainfall the leading position.
Using SEEP/W software to simulate the detailed analysis of rainfall intensity, rainfall duration, pavement type, variation of subgrade humidity of subgrade and pavement crack conditions. The results show that: 1) impervious pavement conditions, soil shoulder, slope, central zone is the main path of rainwater infiltration, forming an arc disturbed zone in subgrade internal; 2) rainfall duration under certain conditions, the disturbance range and the rainfall intensity was positively proportional to the perturbation range, subgrade soil moisture was logarithmic function relationship with rainfall intensity; 3) rainfall intensity under certain conditions, the perturbation range of the subgrade soil moisture and rainfall duration with logarithmic function; 4) permeable pavement under the condition, affected by rainfall is the largest area under the roadbed and embankment, embankment region is less affected, the central road under the subgrade humidity disturbance depth increase with time linear diffusion; 5) pavement cracks are under no water for the rainfall intensity is less than the material permeability coefficient of rainfall, the unsaturated subgrade humidity field has no obvious change; heavy rainfall water, unsaturated seepage flow field will be changed obviously subgrade; 6) subgrade cracks around the subgrade humidity disturbance range with the increase of time is linear diffusion.
Using SEEP/W software to simulate the variation of subgrade humidity with analysis of underground water level fluctuation conditions. The results show that: 1) in the same under the situation of underground water level, with the extension of time, the perturbation range of groundwater on Subgrade humidity increases, eventually tends to balance, the maximum rising height of capillary water; 2) effect on Subgrade humidity field of limited scope, 96% degree of compaction of the silty clay the maximum rising height of capillary water is 6.75m, distance of disturbance changes over time in line with the relation of D at2bt law; 3) underground water fall process, subgrade soil volume water content and time with m AE BTV C the law.
4. According to the difference of main influence factors of roadbed humidity, the roadbed is divided into 3 types. A TMI wPI model suitable for type I subgrade humidity prediction is proposed, and a groundwater level model for predicting type III roadbed humidity is perfected, and the prediction process of subgrade humidity is given.
3 indoor repeated loading three axis tests were carried out. The test contents include routine dynamic modulus of elasticity and permanent deformation of subgrade soil. The results show that resilient modulus of all kinds of subgrade soil is very sensitive to the change of water content, and the higher the moisture content, the greater the permanent deformation.

【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U416.1

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