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。
This study is to investigate the effect of the interlayer on mechanical properties and failure mechanisms of salt rock containing interlayers. To overcome the difficulties of field sampling, salt rock samples were prepared in the laboratory for uniaxial and triaxial compression experiments. The experimental results showed that the deformation difference between salt rock and interlayer had a great effect on the mechanical properties of interlayer-bearing salt rock, such as strength and elastic modulus. Under uniaxial compression condition, the fracture failure of salt rock initiated from the interlayer, and then developed into the salt rock layer. It was found that the compressive strength decreased with increasing the interlayer thicknesses. The compressive strength of salt rock samples containing a single interlayer was higher than that of salt rock containing two interlayers. The compressive strength and elastic modulus of salt rock were weakened by the inclined angles of the interlayer. Furthermore, the types of damage in bedded salt rock can be divided into fracture and slippage along the interface between interlayer and salt rock. Under triaxial compression condition, all the compressive strength, elastic modulus and deformation at peak load of bedded salt rock were lower than those of pure salt rock. The pure salt rock demonstrated lateral expansion and failure, and no obvious rupture surface was found. While the mudstone interlayer in the sandwich salt rock showed the characteristics of shear failure, and part of the salt interlayer was lateral expansion. Therefore, this paper can provide helpful guidance to the construction and operation of gas storage caverns in bedded salt rock.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2017年第11期3119-3126,共8页
Rock and Soil Mechanics
基金
国家自然科学基金青年基金资助项目(No.51504220)~~
关键词
层状盐岩
脆硬夹层
单轴压缩
三轴压缩
力学特性
bedded salt rocks
brittle-hard interlayer
uniaxial compression
triaxial compression
mechanical properties
