硬石膏矿层底板突水预测和评价

基于硬石膏矿层底板灰岩水文地质和工程地质条件计算的矿层开采后导水裂隙带的高度为16m,原位张裂隙带高度为5m。为防止采矿时底板突水,设计预留隔水石膏矿柱80m,其有效隔水层厚度为59m。运用突水系法和阻水强度法计算的有效隔水层厚度分别为61、50和36m。根据技术、经济和安全的原则,分析认为有效隔水层厚度取50m就能达到安全开采的目的。

Anhydrite Ore Bed Floor Water Bursting Prediction and Appraisal

Estimated height of water conducted fracture zone is 16m, and height of in-situ tension fracture zone is 5m after the ore bed was mined; the estimation is based on anhydrite ore bed floor limestone hydrogeological and engineering geological conditions. To prevent floor water bursting during mining, 80m safety anhydrite pillar is designed, its effective confining bed thickness 59m. The effective confining bed thicknesses estimated through water bursting coefficient method and water-stop strength method are 61m, 50m and 36m respectively. Based on technological, economic and safety principles, the analysis has figured out that to take 50m as the effective confining bed thickness can come up to the target of safety mining.