本文選題：高速公路 + 瀝青路面深層病害　； 參考：《武漢工程大學》2015年碩士論文

【摘要】：隨著我國高速公路建設里程逐年增多,公路養(yǎng)護、重建工作將成為公路建設行業(yè)的重要任務之一。對路面采取預防性養(yǎng)護措施,能對路面潛在病害的發(fā)展起到預防抑制作用,同時提高路面技術狀況,延長路面使用壽命。近年來,高聚物化學注漿技術運用于公路養(yǎng)護維修工程中,用于治理路面深層次病害,如路面基層沉陷、基層裂縫、層間脫空、唧漿等,優(yōu)勢突出,效果良好。但對高聚物注漿技術的注漿機理研究相對滯后,工程設計與施工長期依賴于經(jīng)驗總結,限制了這一優(yōu)良技術的廣泛運用。本文參照國內外有關高聚物注漿技術及其應用實例,結合廣惠高速公路高聚物注漿路段試驗,對高聚物注漿材料在瀝青路面內部擴散機理以及施工工藝方面進行研究。在對多雨地區(qū)瀝青路面典型病害歸納總結的基礎上,將瀝青路面病害類型分為路表病害及深層病害,深層病害主要體現(xiàn)在基層損壞方面;結合高聚物注漿原理及特點,分析了高聚物注漿治理瀝青路面深層病害的合適時機;結合高聚物注漿材料的流動性及劈裂注漿理論,探討了高聚物材料在瀝青路面結構層內的擴散方式以及擴散機理;借以點源式擴散模型理論分析注漿壓力與注漿擴散半徑、注漿量之間的相關性。分析主要結果如下:(1)硬質高聚物注漿材料的流動性與反應溫度、時間極其相關,混合體的粘度隨溫度升高而上升,內在原因是,溫度的升高促進了反應的進行,漿體凝固時間越快,粘度上升越快;在同一溫度下,漿體粘度隨著時間的延長而增大,即粘度與溫度、時間均成正比關系;(2)高聚物注漿在路面結構內部主要以填充擠密層間定向劈裂鼓泡壓密不定向劈裂三種方式擴散,隨著擴散半徑的增大,注漿壓力以及裂隙厚度隨之減小。以高聚物雙組份黑白料1:1的質量比、自由體積膨脹比1:15~1:20、自由膨脹密度變化范圍50~100kg/m3、凝膠時間15秒以及固化時間約1min作為原材料技術指標制得高聚物注漿材料,按照10、12、13、14、15的發(fā)泡倍率制作容積為309cm3的圓柱形高聚物泡沫試件進行室內試驗,包括吸水率試驗、無側限抗壓強度試驗、浸水無側限抗壓強度試驗和水質pH影響,獲得高聚物注漿材料密度與吸水率及抗壓強度之間的相關性:吸水率隨著試件密度的增加呈下降趨勢;當膨脹倍率在11~15倍時,聚氨酯高聚物密度對材料的抗壓強度影響不大;聚氨酯高聚物材料抗壓強度受水影響較小,聚氨酯高聚物注入路面基層后對地下水的pH值無影響。因此,初步判斷按該技術指標獲得的高聚物材料可應用于公路維修中。2013年10月,課題組調查并分析了廣東省廣惠高速公路注漿前的路面技術狀況及沿線自然條件,對注漿方案進行合理設計,并選定注漿路段;通過開槽試注漿觀察高聚物漿液在路面結構內部的流動方式,驗證理論分析中高聚物注漿的擴散機理;借鑒《高分子聚合物注漿處治高速公路病害施工工法》,結合廣惠高速公路瀝青路面基底高聚物注漿試驗路段情況,對注漿孔布置及注漿壓力控制方法進行補充完善,依據(jù)注漿前后落錘式彎沉儀(FWD)無損檢測結果,提出新的高聚物注漿彎沉控制標準,并理論分析了注漿后瀝青路面的使用壽命。依據(jù)試注漿結果,分別對注漿孔縱向間距注漿壓力控制方法進行補充完善:(1)本次漿液擴散半徑的變化范圍為1~4m,為保證注漿實施效果,并綜合考慮工程量及經(jīng)濟效益,將滿布時的注漿孔縱向間距設置和沿縫注漿孔布置方法作出以下變動:①表面無明顯病害,彎沉值較小,縱向距離布置為1.2~1.5m;②表面無明顯病害,彎沉值較大,縱向距離布置為1.5~2m;③沿縫注漿孔間距設置為1.5m;(2)若注漿時注漿壓力突然增高,注漿壓力反力回彈,應立即停止注漿,穩(wěn)壓注漿槍15~30s左右即可,若注漿壓力突然減小,那么意味著遇到了空洞或漿液開始劈裂流動,或是膨脹的漿液已開始將路面隆起,此時應對注漿孔周圍半徑1m范圍內路面高程進行時刻關注。為防止過多的注漿量導致路面隆起,在注漿壓力下降后繼續(xù)注漿的時間應控制在1~2min。試驗路段注漿前后彎沉值及土基模量值都有所增大,注漿后路面使用壽命理論上提高了27%。
[Abstract]:As the mileage of highway construction in China is increasing year by year, highway maintenance and reconstruction will become one of the important tasks of highway construction industry. Taking preventive maintenance measures to pavement can prevent and suppress the development of potential pavement diseases, improve pavement technology and prolong the service life of pavement. In recent years, polymer chemistry Grouting technology is used in highway maintenance and maintenance engineering, which is used to control deep subsurface disease, such as pavement subsurface subsidence, base crack, interlayer empty, slurry and so on. The advantage is outstanding and the effect is good. But the research on grouting mechanism of polymer grouting technology is relatively lagging behind, the project design and construction depend on the experience summary for a long time, limiting this fine. Based on the high polymer grouting technology at home and abroad and its application examples, this paper studies the diffusion mechanism and construction technology of polymer grouting material on the asphalt pavement, combining with the experiment of the high polymer grouting section of Guanghui expressway, and the basis of the summary of the typical diseases of the asphalt pavement in the rainy area. The type of asphalt pavement disease is divided into road surface disease and deep disease, and the deep disease is mainly reflected in the damage of base course. Combined with the principle and characteristics of polymer grouting, the appropriate time to treat the deep asphalt pavement disease by polymer grouting is analyzed, and the polymer grouting material's fluidity and splitting grouting theory are combined to discuss the polymer. The diffusion mechanism and diffusion mechanism of the material in the asphalt pavement structure layer are analyzed by the point source diffusion model theory. The correlation between grouting pressure and grouting diffusion radius and grouting amount is analyzed. The main results are as follows: (1) the fluidity of the hard polymer grouting material is closely related to the reaction temperature and time, and the viscosity of the mixture is with the temperature. The inner reason is that the increase of temperature promotes the reaction, the faster the solidifying time of the slurry, the faster the viscosity rises, the viscosity of the slurry increases with the time, that is, the viscosity is proportional to the temperature and time, and (2) the Gao Ju grouting is mainly packed in the pavement structure with the directional splitting between the layers. With the increase of the diffusion radius, the grouting pressure and the thickness of the crack decrease with the increase of the diffusion radius, with the mass ratio of 1:1, the free volume expansion ratio 1:15~1:20, the free expansion density range 50~100kg/m3, the gelation time of 15 seconds and the curing time about 1min as raw material, with the increase of the diffusion radius. The polymer grouting material was made by technical index. A cylindrical polymer foam specimen with a volume of 309cm3 was made according to the foaming ratio of 10,12,13,14,15 to carry out the laboratory test, including the water absorption test, the unconfined compression strength test, the unconfined compression strength test and the water quality pH, and the density and water absorption of the polymer grouting material were obtained. The correlation between the compressive strength: the water absorption rate decreases with the increase of the specimen density; when the expansion ratio is 11~15 times, the polyurethane polymer density has little effect on the compressive strength of the material; the compressive strength of the polyurethane polymer material is less affected by the water, and the polyurethane polymer has no effect on the pH value of the ground water after the polyurethane polymer is injected into the pavement base. Therefore, the preliminary judgment of the polymer material obtained by this technical index can be applied to highway maintenance in October.2013. The project group investigated and analyzed the technical conditions and natural conditions of the pavement before grouting in Guanghui Expressway in Guangdong Province, designed the grouting scheme reasonably, and selected the grouting section, and observed the high cohesion through the slotting test grouting. The flow mode of the slurry in the pavement structure verifies the diffusion mechanism of the polymer grouting in the theoretical analysis, and the grouting hole layout and grouting pressure control method is supplementing with reference to the construction method of "high polymer grouting treatment for Expressway disease" and the condition of the asphalt pavement base polymer grouting test section of Guanghui expressway. It is perfect, according to the nondestructive testing result of the drop hammer type deflection instrument (FWD) before and after grouting, the new control standard of polymer grouting deflection is put forward, and the service life of the asphalt pavement after grouting is analyzed theoretically. According to the results of the grouting, the grouting pressure control method of the longitudinal spacing of the grouting hole is supplemented and perfected respectively: (1) the change of the diffusion radius of the slurry. The range is 1~4m. In order to ensure the effect of grouting, and considering the engineering quantity and economic benefit, the following changes are made in the setting of the longitudinal spacing of the grouting hole and the layout method of grouting hole along the seam. (1) there is no obvious disease on the surface, the deflection value is small, the longitudinal distance is arranged as 1.2~ 1.5m; there is no obvious disease on the surface, the deflection value is larger and the longitudinal distance is long. The spacing is arranged as 1.5~2m; (2) the spacing of grouting holes in the seam is set to 1.5m; (2) if the grouting pressure increases suddenly and the grouting pressure is back to rebound, the grouting pressure should be stopped immediately and the grouting gun is stabilized around 15~30s. If the grouting pressure suddenly decreases, it means that the hole or slurry begins to split flow, or the swelling slurry has begun to start. In order to prevent excessive grouting to lead to road uplift, the time of continuing grouting after the grouting pressure drops should be controlled to increase the value of the deflection and the modulus of soil foundation before and after grouting in the 1~2min. test section, and the theory of the life span of the pavement after the grouting is applied to the pavement. Up 27%.
【學位授予單位】：武漢工程大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U418.6

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