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大型地下水封石洞油库是目前国内外石油战略储备的重要方式,为保证该类大断面不支护地下洞室群的稳定,需优化洞室群的布置。在分析山东某地下水封洞库群工程地质条件的基础上,建立洞室群数值模型。根据三轴试验、围岩RMR(rock mass rating)分类和广义Heok-Brown准则估计了II、III和IV类围岩的岩体力学参数。以洞室埋深、轴向和间距为因素,采用正交设计的方法进行数值试验,以关键点位移和塑性区面积作为评价指标对试验结果进行直观分析,得到对洞室围岩变形和塑性区面积影响最显著的为洞室轴向,并研究了轴向对围岩变形和塑性区面积的影响,得到该水封洞库洞室群的最优布置方案为埋深-60.0 m,轴向N30°W,间距为25 m。其研究结果对地下水封洞库洞室群的布置具有一定工程意义和理论价值。
Large-scale underground water sealed oil reservoirs are an important way to reserve strategic petroleum reserves at home and abroad. In order to ensure the stability of such large-scale unsupported underground caverns, it is necessary to optimize the layout of caverns. Based on the analysis of engineering geological conditions of a groundwater sealed reservoir group in Shandong Province, a numerical model of the cavern group was established. Rock mechanics parameters of Group II, III, and IV surrounding rock are estimated based on triaxial tests, RMR (rock mass rating) and generalized Heok-Brown criteria. Taking the burial depth, axial distance and spacing of caverns as factors, the numerical experiment was carried out by orthogonal design method. The key point displacements and plastic zone area were used as evaluation indexes to analyze the test results intuitively. The deformation and plasticity The most significant influence of the area is the axial direction of the cavern, and the influence of the axial direction on the deformation and plastic area of the surrounding rock is studied. The optimal arrangement scheme of cavern group with the cavern depth of -60.0 m, To N30 ° W, the spacing is 25 m. The results of this study have certain engineering significance and theoretical value for the layout of underground caverns.