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初始地应力场是影响深埋工程设计施工的关键因素,主要包括垂直自重应力和水平构造应力,呈三维梯度分布。但当前许多地下工程的数值模拟却只考虑自重应力而忽略构造应力,与实际初始地应力场分布规律不符。基于数值分析软件ANSYS,提出了APDL生成法和VB生成法,分别创建了包含三维梯度信息的初应力文件,成功地给计算模型施加了符合初始地应力分布规律的初始应力场。实践证明,这两种方法均可对初始地应力场进行定性的模拟。进一步比较和分析二者的计算结果,建议采用VB生成法,以获得与实际更为相符的模拟效果。
The initial stress field is the key factor that influences the design and construction of deep-buried engineering. It mainly includes vertical self-weighting stress and horizontal tectonic stress and three-dimensional gradient distribution. However, many current underground engineering numerical simulations only consider gravity stress and neglect tectonic stress, which is inconsistent with the actual distribution of initial geostress field. Based on the numerical analysis software ANSYS, APDL generation method and VB generation method are proposed. Initial stress files containing three-dimensional gradient information are respectively created. The initial stress field which accords with the distribution rule of initial stress is successfully applied to the calculation model. It has been proved by practice that both methods can qualitatively simulate initial geostress field. Further comparison and analysis of the results of the two calculations, it is recommended to use VB generation method to get more realistic simulation results.