沿江冲、淤积地层钻孔灌注桩施工问题及分析

Problem and Analysis of Bored Caisson pile Construction of Alluvium、Silting Layer Along Yangzi River

安徽某发电厂一期工程在试桩过程中，进行了６００ｍｍ与８００ｍｍ两种孔径的钻孔灌注桩试桩，通过试桩比较，发现施工过程存在缩扩径、离析、沉渣过厚、砼初凝时间太短、浇灌时间太长等问题。提出软土地区钻孔灌注桩的施工及处理方法。

During the first engineering test picket for a power plant of Anhui,carray out drill holes perfusum test picket of  600 mm and  800 mm two aperture.Across compare of test picket,find during the construction have the questions such as contractanlarse diamater、away dissect、thick brokenbits of sink、the time is short of first coagulation、the time is long of irrigate.Bring out the meantion for construct and deal of drill perfusion in sort soil region.