注浆技术在路基加固中的机理及应用研究

发布时间：2019-04-27 15:34

【摘要】：随着我国道路交通事业的迅速发展,各级道路在运营过程中面临的养护维修、加固改建等任务日益繁重,注浆技术在道路路基加固中获得了越来越广泛的应用。但由于注浆工程具有隐蔽性、浆液流动涉及的因素众多、地基内部土体结构复杂等原因,导致现有注浆理论滞后于工程应用,尤其是注浆技术在路基加固中的机理和应用缺乏较为系统的研究结论,难以有效指导施工。基于此,本文在大量理论分析和文献研究的基础上,针对现有研究存在的问题和不足,开展了注浆技术在路基加固中的机理和应用研究。本文以水泥浆液和砂土体为研究对象,采用自主设计的试验装置开展了室内试验,并结合多种数值分析工具,对水泥浆液在砂土体中的扩散形式、扩散规律及加固效果等进行了系统的分析,得到了一系列的规律和结论。(1)基于现有可注性理论,通过砂土中水泥浆液的渗透性试验,研究了砂土的粒径、浆液水灰比、注浆压力对于砂土可注性的影响规律,通过对数据结果进行分析,提出了水泥浆液在路基加固中适用的范围。(2)通过室内注浆试验探究了浆液扩散形式以及注浆压力、浆液水灰比对浆液扩散范围的影响规律,结合试验结果建立了假定的注浆结石体数学模型并提出了主要加固区和次要加固区的概念,通过回归分析建立了浆液扩散距离与注浆压力、水灰比之间的定量关系,并结合有限元软件对室内试验设置的合理性进行了简单的验证。(3)在水泥处治砂土试验的结论基础上,并基于一定的假定,对砂土路基中注浆的加固效果进行了研究,通过分析得到了路基土中的最佳掺灰量范围,同时得到了注浆后路基强度早期的增长规律,证实了注浆技术能够满足道路维修加固中早期开放交通的需求;利用BISAR软件分析了注浆加固深度对于路基加固效果的影响规律,得到了较为经济合理的加固深度范围。(4)以S331公路K61+870～K61+980段病害注浆处治实际工程为依托,对注浆加固前后的路表回弹弯沉进行测量,验证了注浆处治技术对于路基的加固效果。
[Abstract]:With the rapid development of road traffic in our country, the maintenance and maintenance, reinforcement and reconstruction of roads at all levels are becoming more and more onerous. Grouting technology has been widely used in road subgrade reinforcement. However, due to the concealment of grouting engineering, the numerous factors involved in slurry flow and the complex structure of soil in the foundation, the existing grouting theory lags behind the engineering application. Especially, the mechanism and application of grouting technology in subgrade reinforcement are lack of systematic research conclusion, so it is difficult to guide construction effectively. On the basis of a great deal of theoretical analysis and literature research, the mechanism and application of grouting technology in subgrade reinforcement are studied in this paper, aiming at the problems and shortcomings existing in the existing research. In this paper, with cement slurry and sand soil as the research object, the laboratory test is carried out with self-designed test device, and the diffusion form of cement paste in sand soil is studied by combining with many numerical analysis tools. A series of rules and conclusions have been obtained by systematical analysis of diffusion law and reinforcement effect. (1) based on the existing injectability theory, the particle size of sand soil, the ratio of slurry to cement and the permeability test of cement slurry in sand have been studied. Based on the analysis of the data results, the applicable scope of cement slurry in subgrade reinforcement is put forward. (2) the grouting diffusion form and grouting pressure are explored through the indoor grouting test, and the influence of grouting pressure on the grouting property of sand soil is discussed through the analysis of the results of the data and the application range of cement slurry in subgrade reinforcement. The influence of slurry-water-cement ratio on the diffusion range of slurry is studied. Based on the experimental results, the assumed mathematical model of grouting grout is established, and the concepts of main and secondary reinforcement zones are put forward. The quantitative relationship between slurry diffusion distance and grouting pressure and water-cement ratio was established by regression analysis. Combined with the finite element software, the rationality of the indoor test is simply verified. (3) on the basis of the conclusion of the sand treatment test with cement, and on the basis of certain assumptions, the reinforcement effect of grouting in the sand subgrade is studied. The optimum range of lime content in roadbed soil is obtained through analysis, and the law of early increase of roadbed strength after grouting is obtained, which proves that grouting technology can meet the demand of early open traffic in road maintenance and reinforcement. The influence of grouting reinforcement depth on subgrade reinforcement effect is analyzed by using BISAR software, and a more economical and reasonable range of reinforcement depth is obtained. (4) based on the actual project of treatment of disease grouting in K61 870~K61 980 section of S331 highway, The springback deflection of road surface before and after grouting reinforcement is measured, and the effect of grouting treatment technology on subgrade reinforcement is verified.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.1

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