饱和软土中挤土桩休止期的探讨

在上海地区许多项桩基静载试验中，发现桩身大部分处于软土中的桩，在规范要求的间歇内，有时桩的竖向承载力与地质资料提供的计算值相差甚远，而有时又基本相符，经比对相同休止期不同场地的桩静载试验结果，发现地质条件的细微差异，可能是造成桩休止期不同的主要因素。本文根据微小的地质差异，阐述其对挤土桩休止期的影响。这一论点若成立，将对工程桩基的投资及安全取值具有一定的实际价值。

DISCUSSION ON INTERRUPTING PERIOD OF SQUEEZING EARTH PILES IN SATURATED SOFT SOIL

Based on many static load tests on pile foundations in Shanghai,it is discovered that vertical bearing capacity of many piles in soft soil often differs greatly from that calculated based on geological data during interruption period required by construction criterions, though there are some exceptions. By comparing static load testing data of piles in different location at same interruption period, it is suggested that a little variations in geological condition may result in different interruption period. This results can be used in investment assessing and safety factor calculations of pile foundation.