强夯与深层搅拌桩地基加固技术在工程中的研究与应用
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摘要
在地基工程施工中,当承载力和变形不能满足设计要求时,就需要对天然的不良地基进行处理或加固。为此,深入对地基加固技术进行理论和实践研究,总结并归纳出经济可行的复合地基加固方法,为工程建设提供一定的理论和实践基础,具有很大的学术意义。
     目前国内外地基处理的方法很多,主要的地基处理方法包括:换填法、预压法、强夯法、振冲法、土和灰土挤密桩法、砂桩法、水泥粉煤灰碎石桩法、深层搅拌法以及高压喷射注浆法等。其中强夯法和深层搅拌法是工程建设中较常用的加固方法。强夯法处理地基(Dynamic Compaction)是用来处理填土、饱和砂土、冲积土以及大量的软土地基的一种重要地基加固方法。水泥土深层搅拌法(DMM, Deep Mixing Method)是用于加固地基的另一种形式,利用深层搅拌法可以达到增加软土地基的承载能力,减少沉降量,提高边坡稳定性的功效。强夯法和深层搅拌法的加固机理不同,施工工艺也截然不同,深入研究两种加固方法的特点,并结合工程情况选择实施可以大大提供工程建设的功效。
     本文首先对强夯法和深层搅拌法的技术特点和加固机理进行论述,充分阐述两种加固方法的加固机理、使用范围、设计方法、施工工艺和质量控制等;接着论述地基加固方案的选择和评价方法,并分析强夯法和深层搅拌加固技术的技术特点,为工程选用合适的地基加固方案奠定基础。文章最后结合一个具体的工程项目实施和实验结果,详细说明强夯法和深层搅拌复合加固技术的施工过程和实施效果。
     文章的最终研究目标是详细说明强夯法和深层搅拌桩加固技术的工作机理及施工工艺方法,并提出相应的地基加固评价选用方法,从而为工程建设中进行地基处理提供方法和依据。
The foundation of structure should be consolidated when the carrying capacity and deformation is not satisfied. So it is meaningful to study the consolidated of foundation, and summarize economical and practicable method for the complex foundation reinforcement technique. This can provide a theoretical and practical base for project construction.
    There are many methods of foundation consolidation for civil engineering, such as soil exchange method, prepress method, dynamic consolidation method, vibrancy rushing method, soil and podsol dense pile method, sand pile, cement-coal-powder and gravel pile method, deep mixing method, high-pressure eject masonry, etc. The dynamic consolidation and deep mixing method ( DMM ) are very common in project construction. Dynamic consolidation is a very important method to soil consolidation, and is very suitable for saturation sand, rushing soil and some soft soil foundation. DMM, which is another form of foundation consolidation, can increase the carrying capacity of soft soil and decrease the settlement and enhance the slope stabilization effect. The consolidation principle and construction techniques of dynamic consolidation method and DMM are quite different from each other. Combining the project practice, it is very necessary to deeply study two consolidation methods.
    In this thesis, first of all, the technical characteristic and consolidation principle of dynamic consolidation method and DMM are discussed. This includes the consolidation principle, the scope of application, design method, construction technique, quality control and so on. Secondly, how to select and estimate a scheme of foundation consolidation are also discussed. The technique characteristic of dynamic consolidation method and deep mixing method are analyzed in the paper. This is the base to choose a suitable method for foundation consolidation. At last, according to a practice project, the thesis gives a particular discussion for the construction process and the application effect of the two methods.
    The primary purpose of this paper is that gives a particular explanation of the work principle and construction technique for the dynamic consolidation method and DDM. It also provides the evaluating schemes for foundation consolidation. So we can get
    
    
    
    some useful methods for foundation consolidation in civil engineering.
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