Far-field stresses on an underground petroleum storage cavern and its effect on stability
Building the underground water-sealed petroleum storage cavern is one important access to assure safe and stable national petroleum storage system. Considering these reasons, some national departments are planning to build one large-scale strategic petroleum storage project in Bohai Gulf. For the special underground structure features, magnitudes and orientation of far-field stresses of planned project area shall be studied in detail. The hydrofracturing measurements has been done in five boreholes of about 140m deep; for the scattered measurement results, it is hard to find out the intrinsic relationships between different measurement spots; therefore, the Shoerey’s Model is taken to process all the measurements, and then the magnitude of stresses at the cavern section is determined accurately; the maximum horizontal stress is 11.02±1.0MPa, and minimum horizontal stress is 6.82±1.0MPa; the orientation of maximum horizontal stress is 76°(±13°), which coincides with the findings by B. C. Haimson, et al. in Korea and the data from WSM, i.e., the orientation of far-field stresses in this region should be between WSW-ENE and E-W. The far-field stresses have few effects on the stability of underground structure according to the stress-to-strength ratio method proposed by Hoek E.; during the excavation, the linear elastic response is the major phenomenon in intact wall rock mass, but falling or sliding of blocks and wedges may occur in some local parts.
C.H.Wang Q.L.Guo S.X.Yang L.F.Ding Y.H.Hou
Institute of Crustal Dynamics, China Earthquake Administration, Beijing, China
国际会议
香港
英文
1-5
2009-05-19（万方平台首次上网日期，不代表论文的发表时间）