本文選題：季凍區(qū) + 路基　； 參考：《東北林業(yè)大學(xué)》2014年碩士論文

【摘要】：季凍區(qū)路基的病害主要是凍脹和融沉,公路路基病害大多是由路基強(qiáng)度的降低造成的,路基產(chǎn)生凍融破壞的主要因素是土體濕度的變化和隨季節(jié)變化的溫度,而直接的原因是經(jīng)過凍融循環(huán)后路基強(qiáng)度的變化。因此,獲取季凍區(qū)路基土溫度、濕度、強(qiáng)度數(shù)據(jù)及其變化規(guī)律,并以此為根據(jù)對(duì)道路進(jìn)行相應(yīng)的處理,對(duì)于防治季凍區(qū)路基凍融破壞、提高公路的服務(wù)水平、延長道路的使用壽命具有重大意義。 為了研究季凍區(qū)路基溫度、濕度變化規(guī)律,自主開發(fā)了路基溫度和濕度遠(yuǎn)程自動(dòng)采集系統(tǒng),選取兩條道路三個(gè)斷面布設(shè)溫度濕度傳感器,利用遠(yuǎn)程路基溫濕度采集系統(tǒng)連續(xù)監(jiān)測(cè)路基溫度濕度變化情況,并在凍融前后用人工鉆孔法采取土樣,測(cè)定路基土的含水率；利用PANDA2可變能量貫入儀采集路基強(qiáng)度數(shù)據(jù),并在室內(nèi)進(jìn)行模擬凍融循環(huán)強(qiáng)度試驗(yàn),對(duì)PANDA2可變能量貫入儀采集的結(jié)果進(jìn)行驗(yàn)證。結(jié)果表明：遠(yuǎn)程路基溫濕度采集系統(tǒng)功能齊全,實(shí)現(xiàn)了實(shí)時(shí)連續(xù)采集路基內(nèi)各個(gè)深度的溫度和濕度數(shù)據(jù),并利用無線傳輸技術(shù)將采集的數(shù)據(jù)及時(shí)準(zhǔn)確地傳送至用戶端。路基中央分隔帶處凍結(jié)深度比兩側(cè)路肩處大,與大地相比,路基凍結(jié)速度快、凍結(jié)深度深,但開始融化的時(shí)間晚,持續(xù)的融化的時(shí)間長；融化期陽面早于陰面,融化速度也大于陰面,路基填土高的凍結(jié)深度大,填土高度相同時(shí)路基寬度小的凍結(jié)深度大；在凍融循環(huán)過程中填筑材料和位置相同時(shí)路基填土高的其土體含水率小。路面積雪融化的滲透會(huì)使路基含水率增大；凍融循環(huán)前后PANDA2可變能量貫入儀現(xiàn)場(chǎng)采集的數(shù)據(jù)表明,路基強(qiáng)度在5月份土體融化之后下降幅度較大,在同等條件下,經(jīng)過凍融循環(huán)后路基填高大的路基強(qiáng)度高；室內(nèi)模擬試驗(yàn)表明,含水率、壓實(shí)度、凍融循環(huán)是影響路基強(qiáng)度的重要因素,路基土在經(jīng)過凍融循環(huán)之后,其回彈模量有變小的趨勢(shì),隨著凍融循環(huán)次數(shù)的增加這種趨勢(shì)越來越小。
[Abstract]:The disease of subgrade in the seasonal frozen section is mainly frost heaving and thaw settlement . Most of the subgrade diseases of the highway are caused by the decrease of the subgrade strength . The main factors of the thaw damage of the subgrade are the change of the soil moisture and the change of the subgrade strength with the season . Therefore , the temperature , humidity , intensity data and the variation law of the subgrade soil in the seasonal frozen section are obtained . Therefore , according to the corresponding treatment of the road , the subgrade soil temperature , humidity , intensity data and the variation law of the road are obtained . Therefore , it is of great significance to control the freeze - thaw damage of the subgrade in the seasonal frozen area , improve the service level of the highway and prolong the service life of the road .

In order to study the change rule of subgrade temperature and humidity in the seasonal frozen section , the remote automatic acquisition system of subgrade temperature and humidity was developed autonomously . The temperature and humidity sensors were set up in three sections of the two roads . The temperature and humidity of the subgrade were continuously monitored by the remote subgrade temperature and humidity acquisition system , and soil samples were taken by manual drilling method before and after freezing and thawing , and the water content of roadbed soil was determined ;
The results show that the remote subgrade temperature and humidity acquisition system has complete functions , realizes real - time continuous acquisition of temperature and humidity data of various depths in the subgrade , and uses the wireless transmission technology to transmit the collected data to the user terminal in a timely and accurate manner .
The thaw duration is higher than that of the pudendal surface and the melting speed is bigger than that of the pudendal surface . The frozen depth of the roadbed filling is large , and the freezing depth of the subgrade width is small when the filling height is the same ;
When the filling material and the position are the same in the freeze - thaw cycle , the soil moisture content of the subgrade is small , and the infiltration of the snow melting of the pavement can increase the water content of the subgrade ;
The data collected on the field of PANDA2 variable energy penetration instrument before and after the freeze - thaw cycle shows that the subgrade strength decreases after thawing in May , and under the same condition , the subgrade is filled with high subgrade strength after freeze - thaw cycles ;
The indoor simulation tests show that the water content , compactness and freeze - thaw cycle are the important factors affecting the subgrade strength , and the rebound modulus of the roadbed soil after the freeze - thaw cycle is smaller . As the number of freeze - thaw cycles increases , the trend is getting smaller and smaller .

【學(xué)位授予單位】：東北林業(yè)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

【參考文獻(xiàn)】

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本文編號(hào)：1850279