Finite element analysis on deformation mechanism of soils under percussion-compact
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摘要: 潜孔锤冲击挤密钻进过程中土体变形机理的分析是非常复杂的,既涉及到材料非线性、几何非线性,又涉及到界面接触摩擦,属于高度非线性问题。利用有限元分析软件ANSYS初步建立了潜孔锤在土中冲击挤密钻进的有限元模型,模拟分析了钻具周围土体的应力、应变位移情况。结果表明,冲击钻进过程中钻头下方土体随压力的不断增大而发生塑性流动,产生急剧变形而破坏。钻具周围的土被重塑和扰动,土的工程性质发生了较大的变化,孔壁周围比较密实稳定。Abstract: The analysis on deformation mechanism of soils is very complicated in the DTH percussion-compact drilling process,which is not only involved in the problem of material nonlinear and geometrical nonlinear,but also involved in the problem of contact friction.Therefore,it is the high nonlinear problem.The finite element model is preliminarily established by ANSYS in the process of DTH percussion-compact drilling in soil,the stress and strain displacement status of the soil around the drilling tool was simulated and analyzed.The results show that the plastic flow is generated following the increasing pressure in the soils under bit,sharp deformation and failure are also generated.The soils around drilling tool are rebuilt and disturbed.Therefore,the engineering properties of soil vary greatly and the soils around hole wall are relatively compacted and stable.
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Keywords:
- percussion-compact /
- finite element /
- ANSYS /
- soil deformation
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