【摘要】 论述了基坑开挖过程中常用的降水方法——明沟排水和井点降水以及相应的水流运动;简要阐述了动水压力分析法和管涌(流砂)的产生机理,导出渗流力公式和管涌的安全系数,对影响基坑水力稳定的因素作简要评述;分析了基坑深开挖过程中渗流场的变化规律及对应力场变化的影响,忽略固结效应,将渗流场的水力作用与应力场耦合,力图通过这种分析,以求得地下水渗流对基坑稳定性影响的基本规律的认识。更多还原

【Abstract】 Motheds of dewatering often being used during the excavation of deep foundation pits Open draining off water and dewatering by well point are firstly discussed in this paper. Dynamic water pressure analytic methods and formation mechanism of piping are then proposed, and formula of seepage force and safety factor of piping are achieved. Finally, the variation law of seepage area during excavation and its influence on stress field are analyzed in detail. Water force of seepage area and stress field are coupled by neglecting the consolidation effect and an understanding of the basic law of influence on the stability of foundation pit by groundwater seepage through this analysis is thus obtained.更多还原