本文選題：凍土　切入點(diǎn)：凍脹翻漿　出處：《蘭州交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：甘肅省地處西北,處于冬季季風(fēng)性氣候區(qū)、西北干旱區(qū)及青藏高寒氣候區(qū)的交匯地帶,冬季嚴(yán)寒,道路凍脹翻漿病害普遍,嚴(yán)重影響了我省的道路工程建設(shè)與發(fā)展。甘肅省春融期間大量的道路工程會(huì)發(fā)生季節(jié)性翻漿病害,影響行車安全及產(chǎn)生道路暢通問(wèn)題,在甘南、合作、臨夏、隴南、定西及烏鞘嶺等地尤其嚴(yán)重,即使是新修的道路工程也經(jīng)常有路基凍脹翻漿病害發(fā)生。甘肅省每年都要投入大量的人力、物力和財(cái)力到道路翻漿病害整治中去。在季節(jié)凍土地區(qū),伴隨著土中水的凍結(jié)和融化,發(fā)生著一系列奇異而獨(dú)特的凍土現(xiàn)象,如隨著大氣溫度的下降,土體溫度降到土中孔隙水結(jié)晶點(diǎn)時(shí),土體便發(fā)生凍結(jié),出現(xiàn)冰晶體,導(dǎo)致土體發(fā)生凍脹。到了春季,隨著氣溫的上升,凍結(jié)后的土體從上層開(kāi)始融化,但凍土層的下層尚未消融,水分無(wú)法下滲,使土體含水量增大,導(dǎo)致強(qiáng)度降低。一旦土體中冰侵入體消融成水,而土體又未能完全排水固結(jié),在上部荷載作用下產(chǎn)生的孔隙水壓力大到足以使路基土體發(fā)生流動(dòng)時(shí),就會(huì)以泥漿形式向上部粗顆粒運(yùn)動(dòng)及從路面裂縫中冒出,使上部結(jié)構(gòu)發(fā)生沉陷變形及道路翻漿冒泥等現(xiàn)象。翻漿的出現(xiàn)極大地降低了路基的穩(wěn)定性和增加了道路變形。現(xiàn)在防治路基凍脹翻漿較為常用的措施是換填凍脹性較小的粗顆粒土。但是,現(xiàn)有室內(nèi)外試驗(yàn)和實(shí)際工程均已證明:通過(guò)換填粗顆粒土的方法只能減少凍脹,不能消除水分遷移。在反復(fù)凍融的情況下,路基中發(fā)生豎向及側(cè)向水分遷移和積聚,路基中仍然會(huì)有較大的含水量,在凍融作用及上部荷載作用下仍有翻漿現(xiàn)象的發(fā)生。現(xiàn)在普遍使用的路基結(jié)構(gòu)不能從根本上消除路基凍脹翻漿病害的發(fā)生,迫切需要尋求新的路基結(jié)構(gòu)型式,改變路基中的水分遷移條件,防止路基凍脹翻漿的發(fā)生。本文通過(guò)理論分析及室內(nèi)試驗(yàn),研究季節(jié)凍土區(qū)道路翻漿破壞機(jī)理及影響因素,通過(guò)室內(nèi)模型試驗(yàn)研究季節(jié)凍土區(qū)路基內(nèi)的水分遷移規(guī)律及路基變形規(guī)律,提出防止道路翻漿破壞的新型雙向防隔水路基結(jié)構(gòu)型式。對(duì)季節(jié)凍土區(qū)道路工程的建設(shè)、運(yùn)營(yíng)及維護(hù)有著重要的現(xiàn)實(shí)意義。
[Abstract]:Gansu Province is located in the northwest, is located in the winter monsoon climate area, the northwest arid area and the Qinghai-Tibet alpine climate area intersection area, the winter cold, the road frost heaving and mudding disease is widespread, It has seriously affected the construction and development of road engineering in our province. A large number of road projects in Gansu Province during the spring melt period will have seasonal mudding disease, which will affect the safety of driving and the problems of road unblocked, in Gannan, cooperation, Linxia, Longnan, Dingxi and Wushaoling are especially serious. Even new road projects often suffer from roadbed frost heaving and slurping. Gansu province spends a lot of manpower every year. Material and financial resources go to the treatment of road ploughing disease. In seasonally frozen soil areas, with the freezing and melting of water in the soil, a series of strange and unique frozen soil phenomena occur, such as as the temperature of the atmosphere drops. When the soil temperature drops to the crystallization point of pore water in the soil, the soil is frozen and ice crystals appear, which results in the frost heaving of the soil. In spring, the frozen soil begins to melt from the upper layer as the temperature rises. However, the lower layer of the frozen soil has not been ablated, and the water can not be infiltrated, which increases the water content of the soil and leads to the decrease of the strength. Once the ice intrusion in the soil melts into water and the soil fails to be completely drained and consolidated, When the pore water pressure under the upper load is large enough to cause the subgrade soil to flow, it will move to the upper thick particles in the form of mud and emerge from the cracks in the pavement. Causes the superstructure to take place the subsidence deformation and the road muddy and so on phenomenon. The appearance of the slurry greatly reduces the roadbed stability and increases the road deformation.Now the common measure to prevent the roadbed frozen-heaving is to replace the fill frost-heave. Coarse grained soil with less property. However, The existing indoor and outdoor tests and practical projects have proved that the method of replacing coarse granular soil can only reduce frost heaving and can not eliminate water migration. In the case of repeated freezing and thawing, vertical and lateral water migration and accumulation occur in the roadbed. There is still a large water content in the roadbed, and there is still the phenomenon of overturning under the action of freezing and thawing and the upper load. The commonly used subgrade structure can not fundamentally eliminate the frost heaving and overturning disease of the roadbed. It is urgent to seek new subgrade structure form, change the water transfer condition in subgrade, prevent the frost-heaving and churning of roadbed. Through theoretical analysis and laboratory test, this paper studies the mechanism and influencing factors of road churn failure in seasonal frozen soil area. Through indoor model test, the law of water migration and subgrade deformation in the subgrade of seasonal frozen soil region is studied, and a new type of bidirectional waterproof subgrade structure is proposed to prevent the road from being damaged by slurry. The construction of road engineering in seasonal frozen soil region is studied. Operation and maintenance have important practical significance.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U418.53

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