深井高压地面预注浆水泥基浆材料改性研究

摘要

In order to meet requirements of the reinforced material performances by the high pressure surface pre-grouting technology of mine roadway in a deep mine shaft,an easy settling,poor diffusivity,short initial setting time and other problems of the conventional single cement grout were solved.In combination with the engineering application conditions,a study was conducted on the new cement base grou-ting and reinforced material to improve the stability and to extend the initial setting time.With a water and cement ratio of 1 : 1 grout as study object,screening and preparation tests of the retarder and stabilizer were conducted.Two compound admixtures were selected,thus the viscidity of the modified grout could be over 25 s,the max initial setting time could be over 32 h and microstructure of the stone binding body would be more compact than before the modification.The 28 day compressive strength and the single cement grout would be the same basically and could be applied to the surface pre-grouting reinforcement for mine roadway in deep mine shaft with good effect.%为了满足深井巷道高压地面预注浆技术对加固材料性能的要求，解决普通单液水泥浆易沉淀、扩散性差、初凝时间短等问题，结合工程应用情况，对新型水泥基注浆加固材料性能进行改性研究，以提高其稳定性、延长初凝时间。以水灰比1：1浆液为研究对象，进行了缓凝剂、稳定剂筛选复配试验，选定了2种复合外加剂，使改性浆液的黏度达到25 s 以上，初凝时间最长超过32 h，结石体的微观结构较改性前更为致密，28 d 抗压强度与单液水泥浆基本一致，应用于深井巷道地面预注浆加固取得了良好效果。