高聚物注浆在高速公路沥青路面内部病害快速修复中的应用研究

发布时间：2018-05-28 02:19

本文选题：高速公路 + 沥青路面深层病害　；参考：《武汉工程大学》2015年硕士论文

【摘要】：随着我国高速公路建设里程逐年增多,公路养护、重建工作将成为公路建设行业的重要任务之一。对路面采取预防性养护措施,能对路面潜在病害的发展起到预防抑制作用,同时提高路面技术状况,延长路面使用寿命。近年来,高聚物化学注浆技术运用于公路养护维修工程中,用于治理路面深层次病害,如路面基层沉陷、基层裂缝、层间脱空、唧浆等,优势突出,效果良好。但对高聚物注浆技术的注浆机理研究相对滞后,工程设计与施工长期依赖于经验总结,限制了这一优良技术的广泛运用。本文参照国内外有关高聚物注浆技术及其应用实例,结合广惠高速公路高聚物注浆路段试验,对高聚物注浆材料在沥青路面内部扩散机理以及施工工艺方面进行研究。在对多雨地区沥青路面典型病害归纳总结的基础上,将沥青路面病害类型分为路表病害及深层病害,深层病害主要体现在基层损坏方面;结合高聚物注浆原理及特点,分析了高聚物注浆治理沥青路面深层病害的合适时机;结合高聚物注浆材料的流动性及劈裂注浆理论,探讨了高聚物材料在沥青路面结构层内的扩散方式以及扩散机理;借以点源式扩散模型理论分析注浆压力与注浆扩散半径、注浆量之间的相关性。分析主要结果如下:(1)硬质高聚物注浆材料的流动性与反应温度、时间极其相关,混合体的粘度随温度升高而上升,内在原因是,温度的升高促进了反应的进行,浆体凝固时间越快,粘度上升越快;在同一温度下,浆体粘度随着时间的延长而增大,即粘度与温度、时间均成正比关系;(2)高聚物注浆在路面结构内部主要以填充挤密层间定向劈裂鼓泡压密不定向劈裂三种方式扩散,随着扩散半径的增大,注浆压力以及裂隙厚度随之减小。以高聚物双组份黑白料1:1的质量比、自由体积膨胀比1:15~1:20、自由膨胀密度变化范围50~100kg/m3、凝胶时间15秒以及固化时间约1min作为原材料技术指标制得高聚物注浆材料,按照10、12、13、14、15的发泡倍率制作容积为309cm3的圆柱形高聚物泡沫试件进行室内试验,包括吸水率试验、无侧限抗压强度试验、浸水无侧限抗压强度试验和水质pH影响,获得高聚物注浆材料密度与吸水率及抗压强度之间的相关性:吸水率随着试件密度的增加呈下降趋势;当膨胀倍率在11~15倍时,聚氨酯高聚物密度对材料的抗压强度影响不大;聚氨酯高聚物材料抗压强度受水影响较小,聚氨酯高聚物注入路面基层后对地下水的pH值无影响。因此,初步判断按该技术指标获得的高聚物材料可应用于公路维修中。2013年10月,课题组调查并分析了广东省广惠高速公路注浆前的路面技术状况及沿线自然条件,对注浆方案进行合理设计,并选定注浆路段;通过开槽试注浆观察高聚物浆液在路面结构内部的流动方式,验证理论分析中高聚物注浆的扩散机理;借鉴《高分子聚合物注浆处治高速公路病害施工工法》,结合广惠高速公路沥青路面基底高聚物注浆试验路段情况,对注浆孔布置及注浆压力控制方法进行补充完善,依据注浆前后落锤式弯沉仪(FWD)无损检测结果,提出新的高聚物注浆弯沉控制标准,并理论分析了注浆后沥青路面的使用寿命。依据试注浆结果,分别对注浆孔纵向间距注浆压力控制方法进行补充完善:(1)本次浆液扩散半径的变化范围为1~4m,为保证注浆实施效果,并综合考虑工程量及经济效益,将满布时的注浆孔纵向间距设置和沿缝注浆孔布置方法作出以下变动:①表面无明显病害,弯沉值较小,纵向距离布置为1.2~1.5m;②表面无明显病害,弯沉值较大,纵向距离布置为1.5~2m;③沿缝注浆孔间距设置为1.5m;(2)若注浆时注浆压力突然增高,注浆压力反力回弹,应立即停止注浆,稳压注浆枪15~30s左右即可,若注浆压力突然减小,那么意味着遇到了空洞或浆液开始劈裂流动,或是膨胀的浆液已开始将路面隆起,此时应对注浆孔周围半径1m范围内路面高程进行时刻关注。为防止过多的注浆量导致路面隆起,在注浆压力下降后继续注浆的时间应控制在1~2min。试验路段注浆前后弯沉值及土基模量值都有所增大,注浆后路面使用寿命理论上提高了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%.
【学位授予单位】：武汉工程大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U418.6

【相似文献】