摘要
管桩水泥土复合桩作为一种新型桩,近年来使用越来越广泛。为研究该复合桩在群桩施打过程中产生的挤土效应,结合现场试验,对打桩过程中产生的径向应力及超孔水压力进行分析,并对比施工前后场地内静力触探结果,试验成果表明：沉桩过程中挤土效应的影响范围约为12倍管桩桩径,超孔压在施工后24h内消散完毕,打桩后场地径向有效应力提高了1.85~2.92倍,复合桩所在土层侧壁阻力提高了2.05~2.45倍。
The composite pile made up of mixing cement-soil and PHC pile is a new kind of composite pile and is widely used. Based on the engineering project, pile lateral horizontal stress, pore water pressure tests and cone penetration test were done to study soil compacting effect while composite pile group driving. The result shows： while piling, the influence of soil compacting effect is within 12 times of pipe pile diameter.Excess pore pressure has been dissipated in 24 hours after construction.. After construction, the horizontal effective stress will be 1.85~2.92 times improved, also side friction will be 2.27~2.45 times improved.
出处
《江苏建筑》
2016年第4期67-71,共5页
Jiangsu Construction
基金
产学研联合创新资金--前瞻性联合研究项目(BY2014005-08)资助
关键词
管桩水泥土复合桩
群桩
超孔隙水压力
径向有效应力
挤土效应
静力触探
composite pile of mixing cement-soil and PHC pile
pile group
excess pore water pressure
radial effective stress
compacting effect
cone penetration test
