储气库高跨比关系及最不稳定位置研究

针对我国盐岩矿床地质结构具有单层厚度薄、软弱夹层多等特点,储气库形状以及盐岩夹层在储气库中的位置对储气库稳定性有很大影响,根据岩石在地下受力情况,分析导致盐岩储气库变形破坏的外力,即地应力。对围岩体微元体进行分析,根据微元体受力情况,推导出了盐岩储气库不同部位受力情况的变化以及高跨比与地应力关系,据此分析夹层所处位置不同对储气库稳定性的影响,根据盐岩在地下物理力学性质情况,用圆弧滑动法分析了储气库下部深度与宽度比值,而后应用数值模拟进行了验证。为储气库建设提供理论依据。

Research on Height-Span Ratio and the Most Unstable Location of Gas Storage

Because the salt rock deposits in China have the characters as the thinner thickness of monolayer and the weak intercalated layers, so the gas storage shape and rock salt interlayer’s position in the storage have an impact on the stability of the storage. According to the force that the rock suffered underground, we analyzed the ground stress, which affected the rock directly. According to the analysis of the infinitesimal force, we analyzed the infinitesimal of surrounding rock, deduced the change of the force in different parts of the gas storage in salt rock and the relationship between height-span ratio and geological stress. According to the analysis above, we analyzed the relationship between different position of interlayer and the impact on the stability of gas storage. According to the physical and mechanical properties of salt rock underground, we used circular slip method to analyze the depth and width ratio of gas storage in lower part. Then the result was proved by numerical calculation and provided theoretical basis for construction of gas storage.