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收集我国大陆地区湛江、黄岛、烟台、惠州、锦州、大连等在建和已建的地下水封洞库工程区76组地应力测试数据,建立了我国地下水封洞库库址区水平主应力v?、垂直主应力H?及侧压比k随埋深的分布图,参照Hoek-Brown方法对地应力特征进行回归分析。结果表明,我国大陆地区地下水封洞库库址区浅部地应力总体上随埋深H增大而增大,垂直主应力v?与H线性关系良好,应力变化梯度略小于Hoek-Brown关系式中的0.027;最大主应力H?及最小水平主应力h?整体上随深度增大而线性增大,散点主要分布在一个倾斜的平行带内;(3)侧压比k在H<200 m范围内分布较为分散,在H>200 m范围内较为集中,且侧压比分布包络线位于Hoek-Brown包络线之内,与全球地应力分布规律较为接近。研究分析和总结了我国地下水封洞库库址区建库深度范围内地应力场分布规律,对我国石油(气)战略储备的规划布局、建设和发展具有一定参考价值。
76 sets of ground stress test data of groundwater sealed caverns under construction and built in Zhanjiang, Huangdao, Yantai, Huizhou, Jinzhou and Dalian in mainland China were collected to establish the horizontal principal stress of underground water caverns in China ?, Vertical principal stress H? And lateral pressure ratio k with the depth of the distribution map, with reference Hoek-Brown method of stress characteristics of the regression analysis. The results show that the shallow ground stress of the groundwater sealed cavern reservoir area increases with the increase of buried depth H in China, and the vertical principal stress v? Has a good linear relationship with H, and the stress gradient is slightly smaller than the Hoek-Brown relation (0.027); the maximum principal stress (H?) And the minimum horizontal principal stress (h?) Increase linearly with depth as a whole, and the scattered points are mainly distributed in an inclined parallel zone; (3) the lateral pressure ratio k is at H <200 m, the distribution is more concentrated in the range of H> 200 m, and the lateral pressure distribution envelope lies within the Hoek-Brown envelope, which is close to the global distribution of earth stress. The paper analyzes and summarizes the distribution of the in-situ stress field in the reservoir depth of the underground water sealed cavern site in our country, which is of certain reference value to the planning, layout, construction and development of China’s petroleum (gas) strategic reserve.