中文摘要：

层状盐岩界面的抗剪强度特性对储气库的稳定性和密闭性具有决定性影响。依托湖北应城盐矿地质和试验资料,讨论不同种类界面的强度特性,提出2种主要界面的抗剪强度模型,并给出破损机制分析。主要结论有：（1）层状盐岩大部分界面为化学沉积界面,因此为强界面,比如盐岩和泥质硬石膏的界面,少部分为机械沉积界面,因而为弱界面,例如泥岩和岩盐的界面,弱界面一般存在于不连续沉积的突变界面处;（2）提出渐变型界面和突变型界面2种不同剪切强度模型,渐变型界面近似于功能梯度材料,突变型界面可以近似作为盐岩和夹层的接触面;（3）渐变型界面可以较好地传递盐岩和夹层由于变形不协调产生的附加作用力,因而不容易产生破损,而突变型界面则不能。建立界面抗剪强度特性与其沉积地质特征之间的相关性,为盐穴油气储库的稳定性和密闭性研究提供重要的参考。

英文摘要：

The interfaces in bedded salt formations have a critical influence on the stability and tightness of underground gas/oil storages. Relying on the geological and test data of Yunying salt mine in Hubei province,the shear strength properties of the interfaces were firstly analyzed,and then two strength models for dominant interfaces were revealed,finally the failure mechanism was discussed. Results show that：（1） Most of the interfaces of bedded salt formations formed by chemical deposition are strong,such as interface between rock salt and argillaceous anhydrite. The strengths of mechanical deposition interfaces are lower,specifically interfaces between mudstone and rock salt. Weak interfaces normally appear at the sudden transition interfaces.（2） Two shear strength models were proposed respectively for the graduate transition interfaces and discrete discontinuous interfaces. Especially gradual transition interfaces are similar to functionally graded materials（FGM） while sudden transition interfaces can be treated as the contact surface between rock salt and interlayer.（3） Gradual transition interfaces could transfer the additional force resulted from the inconsistent deformation between salt rock and interlayer,thus not prone to breakage. However,the sudden transition interfaces cannot. The analysis reveals the relationship between sedimentary characteristics and shear strength of bedded salt formations,which provides important references for the design and construction of underground gas storage in bedded salt formations.