基坑工程中基础抗浮力稳定性验算

CHECKING COMPUTATIONS THE CAPABILITY OF RESISTING RISING OF FOUNDATION

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 makes adverse effects to stability of foundation.The level of groundwater is a main factor to deteminter the size of buoyancy.Basing on the well theory,we can calculate the velocity of water rising after stoping pumping water and the size of buoyancy that effects on the foundation.Dead weight of foundation,friction of backfill and resisting pulled out capability of pile are main types of strength to resist rising of foundation.These can be calculated by relative formula.