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在分析渤海构造演化背景和地质构造特征的基础上,根据区域内已有测点的地应力资料,建立渤海三维应力场优化反演分析模型。通过由有限元法得到的测点处应力值大小及方向与现场实际数据的比较,构建误差函数作为优化目标函数,采用Hooke-Jeeves优化算法与有限元计算相结合的方法进行优化反演分析,将ANSYS有限元程序作为一个计算模块并通过Matlab实现其批处理模式下的循环调用,完成优化反演计算过程,得到了渤海浅部的现今应力场分布规律。优化结果分析表明,该文方法可以通过较少的测点数据优化反演得到较合理的构造应力分布,能够为进一步研究渤海海域现今构造活动提供一定参考。
Based on the analysis of the tectonic evolution background and geological tectonic features of the Bohai Sea, the three-dimensional stress field optimization inversion analysis model of the Bohai Sea is established based on the geostress data of existing measuring points in the area. By comparing the magnitude and direction of the stress value at the measuring point with the actual field data obtained from the finite element method, the error function is constructed as the optimization objective function, the Hooke-Jeeves optimization algorithm and the finite element method are combined to optimize the inversion analysis, ANSYS finite element program as a calculation module and through Matlab to achieve its batch mode cycle calls, the completion of the optimization of the inversion calculation process, the shallow part of the Bohai Sea has been the distribution of the stress field. The result of optimization shows that this method can get a more reasonable tectonic stress distribution through less inversion of measured point data, and can provide some references for further study on tectonic activities in the Bohai Sea.