中文摘要：

基坑底承受高水头承压含水层水压力作用时需要进行抗突涌稳定验算,抗突涌稳定验算对基坑降水设计具有重要影响,决定了水头降低的程度,从而决定了降水井的布置和最终地面沉降值。规范中的抗突涌稳定验算公式基于压力平衡理论,Terzagh i针对砂土基坑的抗突涌稳定验算公式经推导具有与规范公式相同的形式。规范公式具有使坑底土体有效应力大于零、被动区小主应力大于零和水力坡降大于临界水力坡降的含义。

英文摘要：

If there is a confined aquifer under the bottom of an excavation,the high hydraulic pressure in the confined aquifer may cause heave failure of the excavation.The method and theory for checking the stability of heaving are important for design of the dewatering system.The calculations determine the head in the dewatering wells,the layout of the wells and land subsidence due to water withdrawal.The formula in the Code for Design of Building Foundations to check the stability of heaving is based on the balance of pressure.Terzaghi derived a similar formula for excavations in sand.The formula in the Code implies the following meaning for the soil below the bottom of an excavation： it guarantees the effective stress of the soil greater than zero,the minor principal stress of the soil greater than zero,and the hydraulic of the soil greater than the critical hydraulic slope.