弱胶结软岩巷道高分子改性树脂注浆加固技术研究*

为解决弱胶结软岩胶结性差、力学强度低、遇水易软化带来的巷道围岩变形量大的问题，以王洼二矿为例，结合试验巷道围岩条件和注浆加固支护技术特点，提出高分子改性树脂注浆加固方案；并采用室内注浆加固体力学性能试验验证方案的可行性。结果表明:现场围岩单轴抗压强度平均值22.74 MPa、抗拉强度平均值0.674 MPa，高分子改性树脂注浆材料对围岩加固体单轴抗压强度影响不大，但加固体抗拉强度平均值3.07 MPa，相比原岩抗拉强度提高355.5%；现场试验顶板、两帮围岩变形量由之前的大变形逐渐控制在100 mm以内，注浆后30 d基本趋于稳定。研究结果对软岩巷道支护设计和施工具有一定的实际指导意义。

Research on polymer modified resin grouting reinforcement technology for weakly cemented soft rock roadway

In order to solve the problem of large deformation in the roadway surrounding rock caused by the weak cementing property,low mechanical strength and easy to soften when meeting water of the weakly cemented soft rock,taking Wangwa No.2 coal mine as an example,combined with the surrounding rock conditions of the test roadway and the characteristics of grouting reinforcement support technology,a grouting reinforcement scheme of polymer modified resin was proposed,and the feasibility of the scheme was verified by using the laboratory mechanical property tests of grouting reinforced body.The results showed that the average uniaxial compressive strength and tensile strength of filed surrounding rock were 22.74 MPa and 0.674 MPa,respectively,and the polymer modified resin grouting material had less influence on the uniaxial compressive strength of surrounding rock reinforced body.However,the average tensile strength of the reinforced body was 3.07 MPa,which increased by 355.5% than that of the original rock.The deformation of the roof and both sides of the surrounding rock in the field tests was gradually controlled within 100 mm from the previous large deformation,and basically tended to be stable after 30 days of grouting.The results have certain practical guiding significance for the design and construction of soft rock roadway supporting.