自流可控灌浆技术的开发与应用

Development and application of self-flowing controlled grouting

裂隙发育的复杂地质条件灌浆是在灌浆施工中经常遇到的难题之一,该文旨在开发一种适用于此类灌浆需求的自流可控灌浆技术。首先通过实验考察自流可控砂浆的性能,结果表明自流可控砂浆可独立调节其坍落扩展度和V型漏斗通过时间,且稳定性好。然后基于自流可控砂浆的特点,提出自流可控灌浆技术的工艺流程,通过调节自流可控砂浆的坍落扩展度和V型漏斗通过时间以适应不同裂隙宽度(毫米级以上宽度)和扩散距离的要求。最后,通过工程应用验证该技术的可行性。结果表明:自流可控灌浆技术能有效填充毫米级以上宽度的贯通裂隙,适用于将裂隙发育的复杂地质条件转变为常规地质条件。通过自流可控灌浆技术灌注关门孔形成相对封闭灌浆区域,结合水泥灌浆可以满足发育裂隙的复杂地质条件灌浆需求。

Grouting for complex geological conditions like macro fractures is one of the difficult problems in grouting construction.This paper describes a self-flowing controlled grouting for these complex geological conditions. Test of the performance of self-flowing controlled mortar show that the slump-flow and V-funnel time of the self-flowing mortar can be adjusted individually and that the flow is stable.The self-flowing grouting can be used for grouting of different width fractures（more than one millimeter）and flow intervals by using the self-flowing mortars with different slump-flows and V-funnel times.Finally,the feasibility of the self-flowing grouting is shown for engineering applications which show that complex geological conditions like macro fractures can be improved to conventional geological conditions by the self-flowing grouting,which effectively fills connected fractures more than one millimeter in size.