摘要
主要介绍一根超长钻孔灌注桩桩端后压浆试验成果,包含自平衡静载试验以及钻孔取芯试验。结果表明,超长钻孔灌注桩桩端后压浆水泥浆液上返高度在该类地质条件下约达15m左右,但水泥浆液在地下需要较长时间才能达到设计强度,且分布不均。桩周土层标贯试验表明,贯入击数与压浆前相比,普遍提高。自平衡静载荷试验结果表明,压浆后承载力增加50%。因此桩端后压浆对提高桩承载力和改善荷载传递性能有明显的效果。
This paper mainly introduces the test results of an overlength drilling pile with base post grouting technique, including self-balanced loading test and coring test. According to tests, the grouting cement can rise up to 15 m from pile tip under the geological and construction conditions, but requires much time to reach its design strength and distributes non-uniformly around pile tip. The standard penetration tests （SPT） show the number of SPT after grouting is more than that of before grouting. The self-balanced test results indicate that the bearing capacity of the test pile after grouting is 1.5 times of that of before grouting. Comoared with non-grouted oiles, the base post-grouted oiles obviously imorove the bearing capacity and load transfer behavior.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2006年第5期849-852,共4页
Rock and Soil Mechanics
关键词
超长桩
后压浆
承载力
自平衡法
overlength pile
post-grouting pile
bearing capacity
self-balanced test
