针对矩形顶管施工引发地表变形预测,在数值模拟中学者们往往忽略了岩土体的空间变异性,导致计算结果不准确。本文在传统随机场理论的基础上,引入数据驱动随机场理论,结合ABAQUS数值软件,建立三维数值模型考虑土体参数空间变异性的模拟方法,并将该方法运用于苏州市某矩形顶管工程,实现了直接从稀疏勘察数据生成岩土参数随机场,系统研究了弹性模量空间变异性对矩形顶管隧道地表沉降的影响规律。结果表明:在融入了弹性模量空间变异性后,不会改变矩形顶管施工地表沉降趋势和规律,其结果更具有参考价值;基于数据驱动随机场的随机有限元计算结果更加符合实际地表沉降规律,并评估了提出计算模型的准确性。研究成果可为矩形顶管施工引起地表沉降预测提供参考。
Prediction for ground settlement induced by box tunneling construction, the spatial variation of rock and soil mass in numerical simulation is ignored, resulting in inaccurate calculation results. Based on the traditional random field theory, this study introduces the data-driven random field theory and combines with ABAQUS numerical software, to establish a three-dimensional numerical model to consider the simulation method of spatial variability of soil parameters. Then, this method is applied to a box tunneling project in Suzhou City to generate geotechnical parameter random fields directly from sparse survey data samples. The results show that when the spatial variability of elastic modulus is incorporated, the ground settlement trend and law of box tunneling construction will not be changed, and the results are more valuable for reference. The results of stochastic finite element calculation based on data-driven random field are more consistent with the actual ground subsidence law, and the accuracy of the proposed calculation model is evaluated. The research results provide a more scientific numerical calculation method for the prediction of ground settlement caused by box tunneling construction.
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