帷幕注浆技术在钾镁盐矿风井病害治理中的应用

Application of Curtain Grouting Technology for Ventilating Shaft Disease Control in Soluble Potassium Salt Mine

摘要:

老挝甘猛省钾盐矿开采系统中风井穿过极易溶于水的光卤石及石盐岩岩层，建成后发现井壁后有溶腔现象，严重威胁风井的正常使用。为了确保井筒施工安全以及矿山生产正常进行，设计采用帷幕注浆对风井病害进行治理。采用自上而下孔口封闭式帷幕注浆工艺，边检查边注浆的施工方式，最终完成了对风井的加固和堵水工作。期间对光卤石及石盐层的胶结材料进行室内试验，确定了一种新型注浆材料——卤水+氧化镁浆液，并确立科学的注浆配合比。通过总结经验，为钾盐矿开采过程中防水、堵（治）水等工作的设计和施工积累了经验。

关键词:钾盐矿;治水;帷幕注浆;注浆材料;卤水+氧化镁浆液;风井

Abstract:

In the mining system of potassium salt mine of Ganmeng Province in Laos, the ventilating shaft passes through carnallite and halilith, which are easily soluble in water. After the ventilating shaft excavating, cavern phenomenon, a serious threat to the normal function of the shaft, is found behind shaft wall. In order to ensure the safety of shaft construction and the normal production, curtain grouting is adopted to control the disease of ventilating shaft. The closed curtain grouting technology is adopted with the method of grouting from the top to bottom and with effect checking while grouting to finish the reinforcement and water plugging. The cementing materials used for carnallite and halite layer were tested in laboratory, a new type of grouting material, brine + magnesium oxide slurry was determined together with the scientific grouting mix ratio. By the summarization, the design and construction experiences are accumulated for waterproofing and water blocking in potash mine mining process.

Key words:potassium salt mine; water control; curtain grouting; grouting material; brine + magnesium oxide slurry; ventilating shaft