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地应力主要是指存在于地壳岩层中的未受工程干扰的天然应力,是影响地下洞室围岩稳定性的主要因素之一。利用FLAC3D数值计算软件的内嵌FISH语言编制了阻尼最小二乘拟合程序,将拟合计算与应力数值计算结合在一起,实现应力自动调整与拟合分析。将这套方法在黄岛地下水封石油洞库工程中进行应用,对场区内#Zk17钻孔的水压致裂地应力测试结果进行拟合,得出场区地应力分布:区内最大主应力值一般为10～12 MPa,中间主应力值为6～8 MPa,最小主应力基本受岩体自重控制,最大主应力方向为水平NWW向,最小主应力方向为竖直方向,库址区属于低-中地应力区。
Geo-stress mainly refers to the natural stress that is not disturbed by engineering in the crustal rock, which is one of the main factors that affect the stability of surrounding rock in underground caverns. The damped least squares fitting program was compiled by using the embedded FISH language of FLAC3D numerical software. The fitting calculation and stress numerical calculation were combined to realize the automatic adjustment and fitting analysis of stress. Applying this method to the Huangdao underground water sealed oil reservoir project, the results of the hydraulic fracturing stress test of # Zk17 borehole in the field area are fitted to obtain the distribution of the in-situ stress: the maximum principal stress value Generally 10-12 MPa and intermediate principal stress 6-8 MPa. The minimum principal stress is basically controlled by the gravity of the rock mass. The direction of maximum principal stress is horizontal NWW, the direction of minimum principal stress is vertical, and the reservoir area belongs to low - Medium stress zone.