钻井水溶法开采的地表沉陷预计研究

Research on surface subsidence prediction for drilling solution mining

为了准确预计钻井水溶法开采后对地表产生的移动和变形,基于钻井水溶法开采特点,利用由不溶矿物形成的结晶水物质的膨胀率,建立了钻井水溶法开采的等价采高模型。此外,还分析了随机介质理论用于钻井水溶法开采地表沉陷预计的可行性。在阐述概率积分法基本原理的基础上,通过借鉴国内外条带水砂充填开采的预计实例,求得了钻井水溶法开采的概率积分法预计参数,并结合工程实例,利用概率积分法预计了某盐矿开采后引起的地表移动变形。结果表明:建立在上覆岩层软弱、顶板跨落基础上的概率积分预计方法适用于钻井水溶法开采的地表沉陷预计,且钻井水溶法开采后引起的地表移动变形值远小于相同条件下的煤矿开采。

In order to accurately predict the surface movement and deformation from drilling solution mining, the equivalent mining height model for drilling solution mining was established based on the characteristics of drill ing solution mining and the expansion of crystallization of water substance which from insoluble mineral. In addi tion, the feasibility that using random medium theory to predict surface subsidence from drilling solution mining was analyzed. Furthermore, on the basis of describing the basic principle of probability integral method, the prob ability integral method prediction parameters for drilling solution mining was solved by learningfrom the mining of sand filling with water. Besides, the surface movement and deformation from drilling solution mining for a salt was predicted. The result shows that probability integral method which based on overburden weak and roof cross off is suitable for drilling solution mining, and the surface movement and deformation from drilling solution mining is smaller than that from coal mining under the same conditions.