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初始地应力场是地下工程稳定性评价的基础。结合大连地下石油储备库工程,提出一种基于现场地应力实测资料直接反演初始地应力场的新方法。首先,通过现场实测地应力结果的统计分析,建立初始地应力与高程之间的关系;其次,由于主应力的方向与模型坐标轴方向不重合,进行应力变换;最后,基于FLAC3D的FISH语言编写函数,采用Hoek-Brown强度准则,直接反演大连地下石油储备库的初始地应力场。计算结果与实测结果的对比分析表明:直接法反演的初始应力场的拟合度较高,误差较小,可以满足工程的需要。该法是一种切实可行、简单有效的方法。
The initial ground stress field is the basis for the stability evaluation of underground engineering. Combined with the project of underground oil reservoir in Dalian, a new method of direct inversion of initial geostress field based on measured data of in-situ geostress was proposed. Firstly, the relationship between the initial geostress and the elevation is established through the statistical analysis of the measured in-situ stress field. Secondly, the stress is transformed because the direction of the principal stress does not coincide with the direction of the model coordinate axis. Finally, the FLAC3D-based FISH language Function, the Hoek-Brown strength criterion is used to directly invert the initial geostress field of Dalian underground oil reservoir. Comparing the calculated result with the measured result, it shows that the initial stress field of the direct method is better fitted and less error, which can meet the needs of the project. The law is a practical, simple and effective method.