微型桩在青银高速公路（河北段）沉降病害治理中的应用研究

发布时间：2018-03-24 15:14

本文选题：青银高速公路　切入点：病害　出处：《西安科技大学》2014年硕士论文

【摘要】：随着国民经济的发展和基础建设的扩大，建成的高速公路日益增多，由于时间和道路线路复杂的地质条件，即有高速公路产生了各种病害，高速公路路基处理技术得到了迅速的发展。在目前高速公路沉降病害治理中，微型桩应用很广泛，，但是微型桩的理论研究远落后于实践，其工作机理需进一步的研究。为了使微型桩处理高速公路沉降病害技术得到更好的推广和应用，对其承载特性及加固机理进行更深入的研究分析是非常必要的。本文以青银高速公路（河北段）所产生的沉降病害为研究对象，采用理论分析、室内外试验及数值模拟相结合的方法，系统分析了青银高速公路（河北段）产生病害的原因，并对其地基土工程地质特性进行了综合评价。同时研究分析了微型桩加固机理，结合微型桩的特点及治理工程，分别分析计算了单桩和群桩的水平、竖向承载力，其结果满足治理工程要求。同时采用现场载荷试验、低应变法等方法对路基处理效果进行了评价，并阐述了微型桩在既有高速公路的施工工艺。本文通过FLAC3D所建立的有限元数值分析模型，对青银高速公路典型路段路堤填筑期和公路运营期的变形破坏规律进行分析，且对微型桩现场静载荷试验进行了模拟分析，并得到与现场试验较为吻合的模拟结果。同时本文还通过改变微型桩的设计参数，获得最优的桩间距和桩长。研究结果表明微型桩在治理高速公路沉降病害有显著效果。
[Abstract]:With the development of national economy and the expansion of basic construction, more and more highways have been built. Due to the complicated geological conditions of time and road routes, there are various diseases of expressway. The technology of highway subgrade treatment has been developed rapidly. At present, micro-pile is widely used in the treatment of expressway settlement disease, but the theoretical research of micro-pile is far behind practice. In order to popularize and apply the technology of micro-pile to deal with highway subsidence disease, it is very necessary to study and analyze the bearing characteristics and reinforcement mechanism of micro-pile. In this paper, taking the settlement disease of Qingyin Expressway (Hebei Section) as the research object, using the method of theoretical analysis, indoor and outdoor test and numerical simulation, the causes of the disease in Qingyin Expressway (Hebei Section) are systematically analyzed. At the same time, the reinforcement mechanism of micro-pile is studied and analyzed. The horizontal and vertical bearing capacity of single pile and group pile are analyzed and calculated according to the characteristics of micro-pile and the treatment project. The results meet the requirements of treatment engineering. At the same time, the effect of subgrade treatment is evaluated by field load test and low strain method, and the construction technology of micro-pile in existing expressway is expounded. Based on the finite element numerical analysis model established by FLAC3D, the deformation and failure law of embankment in typical section of Qingyin Expressway and highway operation period are analyzed in this paper, and the static load test of micro-pile is simulated. At the same time, the optimum pile spacing and pile length are obtained by changing the design parameters of the micro-pile. The results show that the micro-pile has a remarkable effect in controlling the settlement disease of expressway.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U418.5;P642.26

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