桩顶荷载影响负摩阻力的现场试验与数值模拟

Field tests and numerical simulation of working load influences on negative skin friction behaviors of piles

进行了桩顶荷载对于负摩阻力性状影响的现场试验。针对现场试验,进行了数值模拟。现场试验和数值模拟结果都表明:数值模拟结果与实测结果较吻合;与没有桩顶荷载时相比,有桩顶荷载作用时负摩阻力引起的附加沉降较大,中性点的位置较高,附加轴力明显减小;随着桩顶荷载的增加,沉降增加、中性点上移和附加轴力减小的趋势都很明显。结果表明,桩顶荷载对负摩阻力性状的影响是有规律的。

Field tests of influences of working load on negative skin friction behaviors were introduced. According to the field test condition, the corresponding numerical simulation has been carried on. The field test and the numerical simulation results indicat that, the numerical simulation results and the field test results are in accordance well. The additional settlement is bigger and the neutral point position is higher, the additional axial force reduces obviously in piles with working load compared with that in piles without working load induced by negative skin friction. Along with load increase, the additional settlement increases, the neutral point to upper shift, the additional axial force reduces obviously. The result indicates that the load to negative skin friction behavior＇s influence is orderly.