一、盐矿层的工程地质条件矿层深埋地下1000米左右,平均厚约20米,基本上可视为水平岩层。由粒状结构,块状构造为主的石盐及少许石膏薄夹层组成。盐层中有少量短小裂隙。盐层上有一层1～2米厚的块状硬石膏,硬石膏中无裂隙分布。硬石膏之上是块状灰岩,其中裂隙较为发育。盐层下面是一层厚不到1米的块状 First, the salt mine engineering geological conditions Deep underground mine about 1000 meters, with an average thickness of about 20 meters, basically can be regarded as a horizontal rock formation. By the granular structure, block-based structure of the stone salt and a little gypsum composition. There are a few short cracks in the salt layer. Salt layer has a layer of 1 to 2 meters thick piece of anhydrite, anhydrite without cracks in the distribution. Above the anhydrite is massive limestone, of which the fracture is more developed. Below the salt layer is a block less than 1 meter thick