衡水市区地下水位埋藏浅、分布有饱和粉(砂)土地层,在长螺旋钻孔泵压混凝土桩施工过程中,易产生窜孔、缩径、充盈系数过大等现象,严重时液化区域相互贯通,造成地面沉降,对成桩质量和周围环境造成不利影响。针对这些问题,采用土力学理论进行探讨,分析了其产生原因,提出了岩土工程勘察、设计应注意的问题、施工中应采取控制措施。 In the Hengshui urban area, the groundwater table is buried shallowly with saturated powder (sand) soil layers. During the construction process of the long auger boring-pump concrete piles, the phenomenon of overrun, diameter reduction and excessive filling coefficient are easy to occur. In the severe liquefaction area Mutual penetration, resulting in land subsidence, the pile quality and the surrounding environment adversely affected. In view of these problems, this paper discusses the theory of soil mechanics, analyzes its causes, puts forward some problems that should be paid attention to in geotechnical engineering investigation and design, and takes some control measures in construction.