深基坑局部桩间流砂处理技术

QUICKSAND TREATMENT TECHNIQUE AMONG LOCAL PILES IN DEEP FOUNDATION PIT

北京大兴国际机场中南指廊基坑施工中,针对支护桩间出现流砂引起地面开裂塌陷的问题,分析引发流砂的原因,并分别对上层滞水和层间潜水引起的流砂,承压水引起的流砂,被暴雨浸泡后发生的流砂采用不同的技术处理措施,保证了基坑安全.

During middle-south airside concourse foundation pit construction of Beijing Daxing International Airport, the reasons for quicksand causing ground surface crack among supporting piles were analyzed and different treatment techniques and measures were adopted against quicksand caused by perched water and subsurface water among strata, by pressure water and by soaking in rainstorm, to guarantee the foundation pit safety.