含脆硬夹层盐岩力学特性试验研究

发布时间：2018-02-27 07:09

  本文关键词： 层状盐岩 脆硬夹层 单轴压缩 三轴压缩 力学特性　出处：《岩土力学》2017年11期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:In order to study the influence of intercalation characteristics on the mechanical properties and failure of intercalated salt rock, the difficulty of sampling in situ was overcome, and the self-compacting intercalated salt rock was used. Uniaxial and triaxial compression tests were carried out in the laboratory. The results show that the deformation difference between intercalation and salt rock has great influence on the strength and elastic modulus of intercalated salt rock. The failure of intercalated salt rock is axial splitting from intercalation to salt rock, the strength of intercalated salt rock tends to decrease with the increase of intercalation thickness, and the strength of double intercalated salt rock is lower than that of single intercalated salt rock. The existence of intercalation dip angle will weaken the strength and elastic modulus of intercalated salt rock, and the failure form belongs to the combination of slip and splitting. Under the condition of triaxial compression, the compressive strength and elastic modulus of the salt rock with intercalated intercalation, The peak load deformation is lower than that of pure salt rock, the pure salt rock is lateral dilatant failure, and there is no obvious fracture surface, while the mudstone intercalation part of intercalated salt rock shows the characteristic of shear failure. The results of the study provide a powerful experimental basis for the construction and operation of layered salt reservoir.
【作者单位】： 中北大学理学院;太原理工大学矿业工程学院;
【基金】：国家自然科学基金青年基金资助项目(No.51504220)~~
【分类号】：TU458.3
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