富水软岩冻结井筒涌水机理及治理技术研究-建筑与土木工程专业论文.docxVIP

万方数据 万方数据 Subject : Experimental Study on Freezing Shaft Water Burst Mechanism and control Technology in Water-abundant Bedrock Specialty : Architecture and civil engineering Name : Ju Long (Signature) Instructor : Xi-Jiami (Signature) Wang -Zongjin (Signature) ABSTRACT Currently, in the construction of northwest mines, most wellbore need to break through the thick rock formation of Jurassic and Cretaceous. In accord with a high water content and soft lithological rock property, ordinary sinking method is hard to break through, freezing sinking method is generally been used.Most of the freezing method will produce a flow water phenomenon inshaft and ingate after freezing sinking method, the consequence is a long period of wellbore construction and a high cost of water treatment.At present, most used water treatment is backfill grouting method. The effect of this treatment is not as expected, the safety in production is debased. Focusing on this issue, this paper developed an experimental study on cretaceous rock formation freezing shaft water spray and control technology, which has an important engineering application value and theoretical significance. According to the engineering problem, on the basis of indoor test and the engineering background of XinZhuang mining construction, this paper bring out the freezing and thawing effects of cretaceous soft rock microstructure and a physical simulation of shaft freezing water burst mechanism. And then discussed the changing law of soft rock, soft rock and concrete condensation penetrating properties with a simulation of wellbore specimen grouting permeability experiment. The main conclusion is as followed： By testing the porosity data, we made the conclusuion that after a freezing and thawing, the coefficient of permeability of coarse, medium and fine sandstone in increased as 50.8%、 25.5%、28.5%; after twice of freezing and thawing, the coefficient of permeability of coarse, medium and fine san