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地下水的浮力对基础的稳定有不利的影响。地下水位的高低是决定浮力大小的首要因素。根据水井理论可计算出停止降水后地下水的回升速度，从而可以确定各基础所受浮力的大小。基础的自重、回填土的摩阻力和桩的抗拔力是抵抗基础上浮的主要作用力，运用有关公式可逐一求出。
The buoyancy of groundwater has a detrimental effect on the stability of the foundation. The level of the groundwater level is the primary factor that determines the size of the buoyancy. According to well theory, the recovery rate of groundwater after stopping precipitation can be calculated, so that the buoyancy of each foundation can be determined. The basic self-weight, the friction resistance of the backfill soil and the pull-out force of the pile are the main forces that resist the floating of the foundation, and can be calculated one by one by using the relevant formulae.