粉喷桩复合地基承载力分析方法研究

Study on the Calculation of Bearing Capacity of Dry Jet Mixing Pile Composite Foundation

首先深入分析了粉喷桩复合地基的承载机理,在此基础上,考虑粉喷桩与桩周土体的变形协调,采用扩孔理论,导出了粉喷桩与桩周土体的应力应变计算公式,以及粉喷桩的影响范围,并提出了基于桩土应力比的粉喷桩桩复合地基承载力计算方法。现场工程对比试验表明,计算方法与实测数据吻合较好,可满足工程设计计算的需要。

Firstly,the mechanics of dry jet mixing pile composite foundation is studied deeply.The strain and stress of the piles and soil is deduced according to the theory of round-hole expansion,which considered the deformation coordination of the piles and soil.Then a calculation for the bearing capacity of dry jet mixing pile composite foundation is established based on the stress ratio of the piles and soil.Finally,an in-site test is carried out to verify the calculation,and the comparison shows the calculation is in agree with the test.