通过对龙归硝酸盐矿的地面沉降监测,发现其变化特点为:沉降量大,沉降速度快,矿区采空区地面沉降与矿层上覆岩层同步沉降。产生沉降的主要原因是盐层较多且不规则,地质条件脆弱。对地面沉降与成灾原因及过程的认识和发展趋势的预测具有一定的价值。 Through the monitoring of the land subsidence of Longgui nitrate mine, it is found that the characteristics of the subsidence are as follows: large amount of settlement, rapid settlement, surface subsidence in the mined area and synchronous settlement of overlying strata. The main reason for the subsidence is that there are many and irregular salt layers and the geological conditions are fragile. It has certain value to the cognition and development trend of ground subsidence and disaster reason and process.