典型盐岩力学特性分析

通过单轴、三轴压缩实验及劈裂等实验研究了湖北云应、江苏淮安和河南平顶山3 个地区层状盐矿岩样的短 期力学特性，并对不同地区及不同深度地层的纯盐岩力学特性进行比较分析。结果表明：（1）3 地区中单轴抗压强度 和弹性模量最大的岩样为泥岩和含泥岩的盐岩，而其泊松比却是最小的，证明了泥岩变形性能差的特性。含有不同杂 质的盐岩其抗压强度和弹性模量有所增加，其泊松比对杂质的变化不是太敏感。纯盐岩抗压强度、弹性模量和泊松比 随地层深度的增加而增大，取自较浅地层的岩样单轴实验有明显的压密阶段。（2）不同地区的岩样都有随围压的增大 峰值强度相应增大的规律。纯盐岩的内摩擦角基本都大于其他岩样的值，而黏聚力则都小于其他岩样的值。反映了纯 盐岩晶体颗粒大，含杂质少的特点。（3）不同地区的纯盐岩相对于其他岩样的抗拉强度最小。

The Analysis of the Mechanical Properties of Typical Salt Rock

It is studied the short term mechanical properties of samples of bedded salt in Yunying Hubei，Huaian Jiangsu and Pingdingshan Henan by doing experiments of monopodium and triaxial compression and splitting. It also compares stratums in different district and different depth of the pure salt rock mechanical properties. The results showed that（1）the rocks in different area which have the biggest uniaxial compressive strength and modulus of elasticity and the smallest Poisson ratio belong to mudstone and mud salt rock. It indicated that mudstone has bad deformation properties. The salt rock which has different impurity will increase its compressive strength and modulus of elasticity，and its Poisson ratio is not sensitive to the change of impurity. The compressive strength，modulus of elasticity and Poisson ratio of the pure salt rock increases with increase of the depth of stratum，the rocks from the shallow layer in uniaxial tests have obvious compression phase.（2）the sample in different regions increases as confining pressure peak intensity increase. The comparison of the internal friction angle and cohesive value for different sample in different regions can be obtained，and the internal friction angle of the pure salt rock are greater than those of other values，but the cohesion are smaller than other sample value，reflecting that the crystal particles of pure salt rock are big，and contain less impurity.（3）the tensile strength of the pure salt rock in different regions relative to the other samples is minimum.