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应用路基和土基的Duncan-Chang模型,选用拼接路基顶面的最大沉降量作为目标函数,研究了路基拼接工况下模型的灵敏度函数和最敏感参数,使用实体工程中沉降板的检测数据进行了参数反演,并根据反算参数计算了铺筑路面结构层引起的路基顶面差异沉降。研究结果表明:拼接工况下,路基E-B模型对模量指数n最敏感,模量系数kE也有较大影响;土基E-B模型对破坏比Rf最敏感,kE和n也有较大影响;埋设在土基顶面和路堤中层的沉降板检测数据可用来反算土基和路基Duncan-Chang模型的最敏感参数;拼接路基表面的工后沉降计算曲线与类似工程实测沉降曲线具有较高的相似性,采用反算参数的数值仿真可以描述拼接工况下路基的沉降特征。
Using the Duncan-Chang model of subgrade and subgrade, the maximum settlement of the top of spliced subgrade is selected as the objective function. The sensitivity function and the most sensitive parameters of the model under subgrade splicing are studied. The parameter inversion is performed and the differential settlement of the subgrade surface caused by pavement structure layer is calculated based on the back-calculation parameters. The results show that the embankment EB model is the most sensitive to the modulus index n and the modulus coefficient kE also has a greater impact under the splicing conditions; the EB model is the most sensitive to the damage than Rf, kE and n also have a greater impact; buried in The test data of the settlement plate on the top of the soil foundation and the middle layer of the embankment can be used to calculate the most sensitive parameters of the Duncan-Chang model of the soil foundation and embankment; the post-construction settlement curve of the spliced subgrade surface has a higher similarity with the measured settlement curve of the similar project The numerical simulation of back-calculation parameters can describe the settlement characteristics of roadbed under splicing conditions.