压力循环作用下灌浆材料性能演化及其在地下水封石油储库工程中的应用

Property Evolution of Sulphoaluminate Grouting Material under Pressure Circulation

地下水封石油储库工程明显不同于常规地下工程,其不仅对水封条件和水封效果的要求较高,而且由于其地质特殊性、结构特殊性和施工特殊性所带来的岩体灌浆难题也是影响工程的重要因素。文章针对国内某大型地下水封石油储库在施工期间部分采用基于硫铝酸盐水泥的灌浆材料,在压力循环灌浆工艺下初凝时间显著提前,温升速度明显加快等问题,通过室内模拟灌浆试验发现,基于硫铝酸盐水泥的灌浆材料在不同压力循环下性能差异性较大,其水化放热的峰值时间随着循环时间的加长而缩短,且循环压力越高,峰值温度也越高;其抗压强度随循环时间的加长而降低,且循环时间越长,抗压强度下降越明显。

Water-sealed underground oil tank projects are quite different from traditional underground projectssince the water-sealing conditions are very strict and the difficulties caused by the geological specificity, structuralspecificity and construction specificity are key factors affecting the project. In light of the significant early initialsetting time and rapid temperature increase of sulphoaluminate cement-based grouting material for a large domesticwater-sealed underground oil tank with pressurized cyclic grouting, a laboratory grouting simulation is conducted. Itis found that the properties of the sulphoaluminate cement-based grouting material are quite different under differentpressure cycles, the hydration exothermic peak time gets shorter with an increase of circulation time, the compressivestrength decreases with an increase of circulation time, and the longer the circulation time the more obvious the de-crease of compressive strength.