摘要
高喷插芯组合桩(简称JPP)是一种新型的复合材料桩,具有承载力高、造价低等优点。利用岩土工程专业软件FLAC3D对JPP群桩竖向承载特性进行了数值模拟分析,讨论了桩数、桩间距、桩长、不同组合形式、不同水泥土弹性模量等对竖向承载特性的影响。结果表明:承载力随着桩数的增加而减小,但16根群桩与25根群桩的承载力相差不多,16根群桩承载力可以代表16根以上群桩的承载力;桩间距越大,承载力越小,桩间距宜采用3倍的JPP组合桩径或4倍的芯桩桩径;承载力随着桩长的增加而增加;分段组合形式承载力效果较好,实际工程施工中宜采用之;水泥土弹性模量对竖向位移没有影响,但水泥土弹性模量越大,芯桩轴力越小。
Jet grouting soil-cement-pile strengthened pile(JPP) is a new kind of composite pile, and has the advantages of high bearing capacity and low cost. Using the software FLAC30, the paper mainly focuses on the vertical bearing behavior of JPP pile group. Some influential factors, such as pile number, pile spacing, pile length, combination forms and elastic modulus of soil-cement, are introduced and their effects on vertical bearing behavior are analyzed respectively. Simulation results show that: the bearing capacity increases with pile number, but the bearing capacity of 16-pile group is almost the same as that of 25-pile group, so we can conclude that the hearing capacity of 16-pile group may represent that of over 16-pile group; the bearing capacity decreases with pile spacing increasing, a better pile spacing is about three times of JPP diameter or four times of core pile diameter; the bearing capacity increases with pile length; JPP with segment combination may obtain a higher hearing capacity and is more suitable in practical engineering; the increase of elastic modulus of soil-cement does not affect the vertical settlement, but decreases axial force of core pile.
出处
《防灾减灾工程学报》
CSCD
2009年第4期438-443,共6页
Journal of Disaster Prevention and Mitigation Engineering
关键词
高喷插芯组合群桩
竖向承载特性
数值模拟
承载力
芯桩轴力
JPP pile group
vertical bearing behavior
numerical simulation
bearing capacity
axial force of core pile