软基处理对桩基水平承载力提高的影响研究

Research on the Influence of Soft Soil Foundation Pretreatment on the Improvement of Pile Foundations Horizontal Bearing Capacity

工程实践证明软土地基加固处理后桩基水平承载力提高显著,但如何在工程前期合理预估其提高值仍需深入研究;基于此,文中参考港口工程桩基规范建立了简化p-y法模型,推导了桩侧土极限水平土抗力P_(u)=m(x+x_(0))^(n)幂函数关系曲线,建立了桩身平衡微分方程,并利用常微分方程的级数解理论建立了水平受荷桩解析解,解决了港口工程桩基规范中p-y法计算困难的问题,且便于工程师实际应用。最后通过依托工程现场试桩试验,利用新推求的桩基水平承载力计算公式,分别对软土地基真空预压处理前、后的桩基水平承载力对比分析,认为软土地基真空预压处理后桩基水平承载力由51.6 kN提高至121 kN,并通过现场桩基检测成果对比验证其合理性,为类似工程提供技术参考。

Aiming at the problem of how to estimate the horizontal bearing capacity of the pile foundation after the pre-reinforcement treatment,this paper establishes a simplified p-y method model with reference to the port engineering pile foundation code,and the limit horizontal soil resistance P_(u)=m(x+x_(0))^(n)power function of the clay was given.The balance differential equation of the pile body was established,through the parameter substitution method,the relevant analytical solution was given by the series solution theory of ordinary differential equation,giving The Matlab source code for the calculation of the relevant parameters is obtained.Finally,through the engineering case and the analytical solution newly calculated in this paper,it is concluded that after the soft soil foundation is pre-reinforced by vacuum preloading,the characteristic value of the horizontal bearing capacity of the pile foundation is changed from the original 51.6 N to 121 N,and its rationality is verified by comparing the test results of the pile foundation after pre-reinforcement treatment.