【作者】 陈建峰； 石振明； 张雷； 沈明荣；

【Author】 CHEN Jianfeng SHI Zhenming ZHANG Lei SHEN Mingrong (Dept.of Geotechnical Engineering,Tongji University,Shanghai,200092)

【机构】 同济大学地下建筑与工程系；

【摘要】 由于量测误差的存在,使反分析参数的可靠性降低。分析了路堤工程量测误差的来源以及确定方法,以及采用极大似然法导出了包含协方差矩阵的最小化目标函数表达式,并推导了测斜仪的协方差矩阵。将最小化目标函数值作为遗传算法的适应度值可以优化土性参数。给出一个实例,得出考虑测斜仪误差比未考虑测斜仪误差的计算结果更符合实际情况。更多还原

【Abstract】 Because of the measuring errors,the soil parameters that are back analyzed by the measuring values are sometimes unreliable.This paper analyzes all sorts of the measuring errors in an embankment project,and discusses how to determine these errors.A minimum objective function including covariance matrix is derived by the maximum likelihood method.The soil parameters can be back analyzed when the minimum objective function becomes the fitness function of Genetic Algorithm.By analyzing an embankment,the results considering the measuring errors of inclinometer are more reliable than those not considering the errors.更多还原