多级等速加载条件下碎石桩复合路基的固结解析计算

Analyticalsolutions for consolidation of composite ground with gravel piles under multi-grade loading in equal rates

高速公路路堤的填筑往往是分级进行的,固结需要经过一个较长的过程,若采用瞬时加荷进行计算,很难反映全过程的固结度变化情况,而且,碎石桩复合地基其桩土刚度不一致,桩-土应力比大于1,不能直接引用砂井理论公式。基于桩-土共同分担荷载的原理,建立了碎石桩复合地基在多级等速加荷条件下复合地基固结的数学方程,并分别给出了加荷和停荷情况下的解析解。通过对实际工程的计算分析表明,计算结果与实测数据基本吻合。

The expressway embankments were often constructed in several stages,which needed a long time.If the settlement of subgrades were calculated in the state of immediate loading,it is difficult to represent the relationship between consolidation and time. Because the rigidity of piles is larger than that of soils in the composite ground;the sand drain theory can't be used directly.Based on the piles-soils mutual work theory,the mathematic formulas of consolidation of composite ground with gravel piles were established in the state of multi-grade loading in equal rates;and the analytical solutions were given in the loading state and the waiting state separately.The calculation results are in good agreement with the measured data in practical cases.