淤质与粉质互层土中管桩沉桩过程的土压力

为了研究预应力空心开口管桩沉桩过程中周围土体中的土压力分析,选取杭州郊区某建筑工地进行现场试验.本次试验在试验场地内和防挤沟两侧共埋设了6组振弦式孔隙水压力计和土压力盒,并且在管桩桩端安装了一个土压力盒测试管桩沉桩过程中桩端土压力的变化情况.试验结果表明：在沉桩过程中,周围土体中的径向土压力呈先增大后减少趋势,随着深度的增加,径向土压力的影响越来越大；桩端阻力的变化与静力触探锥尖阻力的变化曲线较为相似,锥尖阻力的变化曲线相比桩端阻力表现出更为明显的波动.该试验结果能够为相关研究和设计提供参考和依据.

The earth pressure during pile driving in silty soil with mucky soil interbed

In order to study the earth pressure during the pile driving, a filed test was did at a building site in Hangzhou suburbs. Six group pressure meter and earth pressure cell were installed at the center of the site and the both sides of the holes to relax stress. A earth pressure was also installed at the tip of the pile to study the earth pressure of the pile tip during pile driving. The test results show that the radial earth pressure increases at the first and decreases at the end during pile driving. With the increase of depth, the effect of the radial earth pressure gets larger; The change of pile tip resistance is similar with the cone penetration test static point resistance and the cone penetration test static point resistance is more significant than the change of pile tip resistance. The test results can offer reference and basis for study and design similarly.