桩基完整性测试的非线性最小二乘优化方法  

Nonlinear Least Squares Method for the Testing of Pile Integrity

作　　者：张灿辉[1] 张建霖[1] 谢建华 

机构地区：[1]厦门大学土木工程系,厦门361005 [2]厦门市建筑安全质量监督站,厦门361000

出　　处：《应用力学学报》2006年第1期142-144,共3页Chinese Journal of Applied Mechanics

基　　金：厦门市科技计划(2002-35-05)资助;行动计算划专项资助(X01102)

摘　　要：针对桩基检测中低应变反射波法存在的应力波被桩土吸收和散射而衰减问题,把包含桩土衰减系数和介质不连续界面反射系数的反射波方程转化为非线性最小二乘优化问题,并采用信赖域法进行求解。由于采用信赖域法并采用了Gauss-Newton方向定义信赖域二维子空间,具有较好的收敛速度。通过模型桩算例表明该方法是确实可行的。The reflected wave method is simple and audiovisual,which has come into common use in the testing of pile integrity,but it is difficult to solve the stress wave attennation by the absorption and scattering of pile and soil.The reflected wave equation including the attennation factor of pile and soil and the reflecting factors of discontinuity interface,is transformed into the nonlinear least square description,the trust region method is suggested to deal with.The Gauss-Newton direction is used to define the two-dimensional subspace of the trust region to accelerate the convergence.The example for real pile verifys the effectiveness of this method.

关 键 词：桩基完整性测试 非线性最小二乘优化问题 信赖域法 

分 类 号：TU473.1[建筑科学—结构工程]