西北地区矿井建设中，多数井筒需要穿过白垩系、侏罗系巨厚岩层，该岩层具有含水量大、岩性松软等特点，普通凿井法施工难度大，多采用冻结法凿井。但是，冻结法施工成井后大部分井筒出现井壁淋水、马头门涌水等水害问题，情况严重的还可能发生淹井事故，导致井筒施工工期长，水治理费用高等问题。目前，多采用壁后注浆治理水害，但部分井筒注浆治水效果不明显，依然存在井筒涌水量过大，影响安全生产。 针对上述问题，论文开展白垩系冻结法施工成井后井壁淋水机理及注浆治理技术研究，具有重要的工程应用价值和理论意义。 本文以新庄煤矿为工程背景，通过室内试验和理论分析研究冻融作用对白垩系软岩微观结构影响，物理模拟冻结井筒涌水机理研究，进而探讨软岩、软岩与混凝土凝结体渗透特性变化规律，同时对模拟井筒试件进行注浆抗渗实验，主要结论有： （1）通过孔隙率测试实验数据，得出一次冻融作用下粗、中、细砂岩渗透系数比原始渗透系数分别增大了50.8%、25.5%、28.5%，二次冻融后渗透系数比原始渗透系数增加了134.9%、76.8%、64.2%。扫描电镜实验表明：一次冻融后岩石颗粒之间松散、脱离，孔隙增大；二次冻融后孔隙裂隙继续发育，并且产生较长裂隙、孔隙裂隙贯穿性好。说明冻融作用下白垩系软岩孔隙率增大，内部产生大量贯穿性裂隙，形成弱导水通道。 （2）进行粗砂岩、中砂岩和细砂岩冻融前后低温氮吸附实验，进一步从微观结构分析冻融作用下软岩孔隙结构变化情况。实验表明：粗砂岩冻融循环后孔隙体积增加以大孔为主，中孔为辅，一次冻融后孔隙率增幅9.8%，二次冻融后孔隙率增幅15.0%。中砂岩冻融循环后孔隙体积增加以大孔、中孔为主，二次冻融循环后中孔增量显著，一次冻融后孔隙率增幅9.4%，二次冻融后孔隙率增幅13.9%。细砂岩冻融循环后孔隙体积增加以中孔为主，大孔为辅，二次冻融循环后中孔增量多，一次冻融后孔隙率增幅7.6%，二次冻融后孔隙率增幅14.2%。 （3）自主设计并加工了模拟井筒冻结实验装置，通过室内实验验证了冻融循环对岩石与混凝土井壁接触面产生破坏，岩石与混凝土出现分界面，形成导水通道，导致岩石与混凝土组合体渗水能力增强。 （4）选取普通硅酸盐水泥、超细水泥和脲醛树脂三种浆液，对冻融作用后的井筒模拟装置进行重复注浆，测量每次注浆后岩石试件的渗透系数，对测量结果进行对比分析，研究不同注浆材料及注浆压力对软岩及软岩与混凝土组合体堵水效果。分析结果：渗透系数随注浆次数增加而减小，对于同一种浆液渗透系数随注浆次数增加而减缓；对与颗粒型水泥浆液，增大水灰比、提升注浆压力都可以提高浆液可注性；超细水泥浆液注入性比硅酸盐水泥浆液好，堵水效果明显。化学浆液能够注入到水所能到达的孔隙裂隙，在低水压情况下可以完全不漏水，堵水效果特别理想。

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： (1)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 sandstone in increased as 134.9%、76.8%、64.2%. The scanning electron microscopy (sem) test indicates that after a freezing and thawing, the rock particles are loosed and departed, the pore is increased. After a twice freezing and thawing, pore fissure continue developed with a longer fracture and a well through pore. It means that after a freezing and thawing, the cretaceous soft rock porosity is increased, well through pore formed a watercourse. (2)To provide the basis of the microstructure analysis of freezing and thawing freeze-thaw cycle effect on the structure of the soft sandstone, we did a test of low-temperature nitrogen adsorption experiments before and after freezing and thawing with both thick sandstone , sandstone and fine sandstone.It indicates that after freezing and thawing cycle, thick sandstone pore volume increase is mainly by macro-porous increase; increment after a once freezing and thawing is 9.8% and 15.0% after a twice freezing and thawing. Medium sandstone pore volume increase is mainly by macro-porous increase and medium-porous increase; increment after a once freezing and thawing is 9.4% and 13.9% after a twice freezing and thawing. Fine sandstone pore volume increase is mainly by medium-porous increase; increment after a once freezing and thawing is 7.6% and 14.2% after a twice freezing and thawing. (3)This paper designed and processed a simulation shaft freezing experiment device, using indoor test verified the freeze-thaw cycle of rock and concrete wall interface, a watercourse formed between the rock and concrete interface. The result is rock and concrete combining water penetration ability is enhanced. (4)Used three kinds of serum urea formaldehyde resin, ordinary portland cement and superfine cement to simulate the re-grouting of freezing and thawing wellbore simulator. By measuring the permeability coefficient of rock specimens before and after grouting, we studied the water treatment effect of soft rock and soft rock and concrete combination in different grouting material and grouting pressure. The result is: The permeability coefficient decreased with the increase of grouting time; for the same kind of slurry permeability coefficient slow down with the increase of grouting time; for the particle type cement, the way to improve grout injectablity is to increase the water cement ratio and grouting pressure; superfine cement grout injection is better than portland cement. The best way of water treatment is the chemical grouting, chemical grout can be injected into the pore fissure which water grouting can not do.