基于ABAQUS的公路软基沉降预测非概率可靠度研究

摘要

高速公路软基沉降是影响路基稳定的重要因素,合理预测路基沉降对于保障路基安全具有重要意义.ABAQUS有限元软件能够处理非常复杂的问题和模拟高度非线性问题,在预测软基沉降方面有很好的应用前景,但鉴于土体参数的变异系数远比一般人工材料大,现行的勘察手段对土体存在较大的扰动,致使勘察数据不能真实反映土体性质,从而很难精确计算和预测软基沉降.在应用ABAQUS有限元软件预测软基沉降的基础上,引入非概率可靠度理论对预测结构进行可靠度分析,从而对预测结果的可信度进行评价.%Sedimentation of soft roadbeds of expressways is an important factor influencing stability of roadbeds, so reasonable prediction for sedimentation of roadbeds shows important significance for guaranteeing safety of roadbed. The ABAQUS finite element software can handle very complicated problems and simulate highly non-linear problems and exhibits very good application prospect in prediction for sedimentation of soft roadbed. However, in view of much larger coefficient of variation of soil parameters than that of general artificial materials, the existing survey techniques produce large disturbance to soil, so the survey data cannot truly reflect the nature of soil, as a result, it is difficult to compute and predict sedimentation of soft roadbeds accurately. On the basis of applying the ABAQUS finite element software to predict sedimentation of soft roadbeds, this paper introduces nonprobabilistic reliability theory to analyze reliability of predicted structures so as to evaluate the credibility of predicted result.