富水破碎岩体注浆加固材料试验研究与应用

针对富水破碎地层注浆治理过程中传统水泥类材料难以实现注浆加固和堵水同步进行的难题，以硫铝酸盐水泥熟料和钢渣微粉为主要原材，成功制备了一种水泥基复合注浆材料（CGM）。通过与传统水泥材料进行性能对比试验，采用扫描电镜和X射线测试手段，分析了CGM材料制备工艺、组分含量和浆液制备条件对材料性能的作用规律，并检验了CGM材料的工程适用性。结果表明：CGM材料宜采用混合粉磨制备工艺，可显著提高其水化活性，且粉磨时间应不超过45 min。钢渣微粉含量越高，水灰比越大，结石体强度越低，凝结时间越长，水灰比超过1.2:1时，结石体后期会出现干缩。与传统水泥材料相比，CGM材料浆液凝结时间与黏度的环境敏感度低，具有显著的工程适用性和性能优越性。

Development of the grouting material for reinforcing water-rich broken rock masses and its application

In grouting reinforcement of water-rich and broken rocks, it is difficult to use the traditional cement-based material to simultaneously achieve water plugging and reinforcement. To solve the above problems, a kind of cement-based composite grouting material (CGM) is developed by using sulphoaluminate cement clinker and steel slag powder. The performances of traditional material and CGM are compared, based on the experimental results of the scanning electron microscope and X-ray testing methods. The effect of preparation methods, constituent contents and slurry preparation conditions on the performance (strength, volume stability and slurry viscosity) of CGM is systematically analyzed, and the feasibility and management effect of CGM are also examined with combination of field applications. The results show that the CGM should be prepared by the process of mixed grinding (less than 45 min), so that its hydration activity can be significantly improved. With the increase of the amounts of steel slag powder and the water-cement ratio, the required setting time increases and the strength decreases. It is found that there exists a late dry shrinkage phenomenon when water-cement ratio exceeds 1.2. Compared with traditional cement materials, the setting time and viscosity of the new CGM material are less sensitive to the environment, showing the good performance of the CGM material.