试桩未达破坏时单桩极限承载力的确定

如何利用未达到破坏的试桩资料来确定其极限承载力是一个重要的工程问题.应用曲线拟合已达到极限承载力的静载荷试验数据,分别对双曲线法、指数曲线法、对数曲线法、灰色理论法等预测方法进行比较分析,结果表明:指数法与双曲线法的精度主要取决于Q-S曲线塑性区域的大小及该区域数据的多少;灰色预测法精度较高;对数曲线法应用有局限,精度较低.

Determination of ultimate bearing capacity of individual piles

It is an important engineering problem to determine the ultimate bearing capacity of an individual pile by using the data of in-situ test below limited load.With the static load test data which has achieved the ultimate bearing capacity and the known data of application curve,comparison is made among the prediction methods of the hyperbola,exponent curve,log curve and gray theory.It is found that the precision of exponential method and the hyperbola method is mainly decided by the region size of Q-S curve plastic and its region data number.The precision of the gray prediction method is accurate,because the limitation of log curve method application the precision is lower than others.