赵集岩盐矿区地质特征与潜在的地质灾害

The geological characteristics and potential geological disaster of the rock salt mining area in Zhaoji

江苏赵集地下发育丰富的盐类资源,主要分布在下第三系阜宁组四段。勘探揭示,岩盐顶界埋藏深度为1400～2100m,单层厚度大,品位高,探明石盐矿储量1350×108t,无水芒硝矿储量20×108t以上。目前,在研究区约25km2内开采岩盐矿床资源的企业多达14家。因此,地下岩盐矿层开采后所形成的岩盐溶腔,是研究区未来发生地面沉降地质灾害的潜在因素。

In the Zhaoji of Jiangsu province, there are abundant salt resources which are mainly distributed in the fourth member of Funing Formation of the lower Tertiary. The exploration results revealed that the buried depth of the salt top boundary is from 1,400m to 2,100m, the thickness of single layer is large, and the resource grade is high. The proved reserves of rock salt and mirabilite are 1,350 x 10^8 tons and more than 20 x 10^8 tons,respectively. At present, there are 14 enterprises which are mining these rock salt resources in about 25km^2 of the studied area. Therefore,the caverns which are formed after exploiting of the rock salt are a potential factor of future ground subsidence in the studied area.