摘要
通过京沪高铁昆山制梁厂制梁台座基础PHC管桩承载力的理论计算及静荷载试验,对软土地区锤击打入的管桩承载力性能进行分析。结果表明软土地区PHC管桩的实际承载力大于按照设计规范计算的承载力;承载力时效性较强,静止时间越长承载力越大,沉降越小;管桩的荷载沉降曲线为陡降型,土体破坏形式为冲切破坏,卸载后桩顶沉降无回弹;桩土的极限相对位移为17 mm^26 mm,大于一般经验值等结论。对今后类似地质条件下PHC管桩承载力的研究和设计应用具有一定的借鉴作用。
Here,the bearing capacity of PHC pipe piles in soft soil were analyzed through the static load experiments at Jing-hu high-speed railway Kunshan beam factory.The following conclusions are drawn： The actual bearing capacity of PHC pipe piles is bigger than the theoretical value calculated through design criterion;The aging performance of bearing capacity of piles is evident,the time is longer after driving,the capacity is greater,and the settlement of piles is smaller at the same load grade;The Q-S curve is the steep drop type of piles in soft soil,the soil around of piles appears punching shear failure,and the settlement is beyond retrieve when the loading grade exceeds the ultimate bearing capacity;The ultimate relative displacement is 17~26 mm which is bigger than experience value,and so on.All these as mentioned above could be references for similar projects.
出处
《水利与建筑工程学报》
2012年第1期60-63,87,共5页
Journal of Water Resources and Architectural Engineering
关键词
PHC管桩
静载试验
软土
极限承载力
相对位移
PHC pipe pile
static load experiment
soft soil
ultimate bearing capacity
relative displacement
