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为研究夹层特征变化对含夹层盐岩力学特性及破坏的影响,克服了现场取样的困难,利用自行压制的含夹层盐岩,在试验室进行了单轴和三轴压缩试验。试验结果表明:夹层和盐岩之间的变形差异对含夹层盐岩的强度、弹性模量等力学特性参数有重大影响。单轴压缩条件下,含夹层盐岩破坏均为由夹层扩展至盐岩的轴向劈裂;含夹层盐岩强度随夹层厚度的增加趋于降低;含双夹层盐岩强度低于含单夹层盐岩;夹层倾角的存在会对含夹层盐岩的强度、弹性模量有削弱作用,并且破坏形式属于滑移和劈裂的综合。三轴压缩条件下,含夹层盐岩的抗压强度、弹性模量、峰值载荷变形量均低于纯盐岩;纯盐岩为侧向膨胀破坏,没有明显的破裂面,而含夹层盐岩中的泥岩夹层部分表现为剪切破坏的特征,盐岩层部分为侧向膨胀。其研究结果为层状盐岩储库的建造和运营提供了有力的试验依据。
In order to study the influence of interlayer characteristics on the mechanical properties and damage of salt rock with interlayer, the difficulty of on-site sampling was overcome. Uniaxial and triaxial compression tests were carried out in the laboratory using self-suppressed interlayer rock containing salt. The experimental results show that the difference between the deformation of interlayer and salt rock has a significant effect on mechanical parameters such as strength and elastic modulus of interlayer rock. Under uniaxial compression, the failure of salt rock with intercalated layers extends from the mezzanine to the axial splitting of salt rock. The strength of salt rock with interlayer tends to decrease with the increase of interlayer thickness. The strength of salt rock with double intercalation is lower than that of single intercalated salt rock Salt rock; the existence of dip angle will weaken the strength and elastic modulus of intercalated salt rocks, and the failure mode belongs to the combination of slip and splitting. Under triaxial compression conditions, the compressive strength, elastic modulus and peak load of salt rock with intercalation are lower than that of pure salt rock; the pure salt rock is lateral expansive failure with no obvious rupture surface, The mudstone intercalations in the middle part show the characteristics of shear failure, and the salt rock part is lateral expansion. The results of this study provide a powerful experimental basis for the construction and operation of layered salt rock reservoirs.