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现阶段基于能量原理的桩土作用理论解答研究仍存在较多不完全合理的假设或急需解决的难点,包括桩土接触面边界处理方法、分层沉积土层界面连续性条件和桩体几何形状等。特别是,桩体几何形状对桩土作用的剧烈程度、桩周土体的位移形式和桩孔边界的几何特征有很大的影响。重点对孔壁边界曲线的几何形状及其曲线方程的假定方法展开研究,并应用四次多项式模拟孔壁边界曲线。然后,以四次孔壁曲线方程的求解结果为基础,综合考虑桩长有限、地面自由、终孔孔壁形状、孔壁位移边界条件以及土体材料非线性,应用变分原理推导沉桩挤土位移、应变和应力场解答。研究方法可作为压桩挤土的进一步理论研究的基础,理论解答对压桩挤土的施工、相应防护措施的选择和设计有一定的指导作用。
At present, based on the theory of energy, the theory of pile-soil reaction still has more or less reasonable assumptions or difficulties to be solved urgently, including the boundary treatment of pile-soil contact surface, the interface continuity of layered sediment layer and the geometry of pile body Wait. In particular, the geometry of pile geometry has a great influence on the severity of pile-soil interaction, the displacement of soil around pile and the geometry of pile-hole boundary. The emphases are put on the geometry of the curve of the hole wall and the assumption of its curve equation, and the quadratic polynomial is used to simulate the boundary curve of the hole wall. Then, on the basis of the solution of the fourth-order hole wall equation, considering the finite pile length, the ground freedom, the shape of the final hole wall, the displacement boundary conditions of the hole wall and the nonlinearity of the soil material, Soil displacement, strain and stress field solutions. The research method can be used as the basis for further theoretical study of pile compaction and soil compaction. The theoretical solution can guide the construction of compacted piles and the selection and design of corresponding protective measures.