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中文摘要：
为了更好地推广湿喷混凝土在矿山的应用,以提高湿喷混凝土的支护效果,基于大量室内实验及多年现场经验,对影响湿喷混凝土可泵性及强度、回弹率的关键因素开展了深入研究.详细阐述了水泥掺量、砂石原材料强度及粒级组成、微硅粉掺量、纤维类型及其掺量、速凝剂和减水剂类型及掺量,以及水灰比等因素对湿喷混凝土可泵性及强度的影响;分析了料浆水灰比、速凝剂掺量、喷枪与受喷面距离、喷枪与受喷面夹角等因素与湿喷混凝土回弹率的内在关系;根据板庙子金矿现场实践,回弹率一般为10％,湿喷混凝土28 d单轴抗压强度为36.2 MPa,抗弯拉强度为3.2 MPa,与干喷混凝土进行对比,各项技术经济指标明显占优,可见湿喷混凝土是喷射混凝土未来的发展趋势.
英文摘要：
To promote the application of wet shotcrete technology in mines and improve its supporting effect, three key factors of affecting pumpability, strength, and rebound rate of wet shotcrete were deeply investigated based on numerous indoor experiments and several years field experiences in wet shotcrete. The influencing factors for pumpability and strength of wet shotcrete were introduced in detail, including dosage of cement, strength of aggregate and its size composition, dosage of silica fume, type and dosage of fiber, type and dosage of accelerator and water reducer, and water-cement ratio etc.. The internal rela- tionship between rebound rate of wet shotcrete and water-cement ratio, dosage of accelerator, distance and angle of spray gun and drift surface were analyzed. The application of wet shotcrete in Banmiaozi gold mine showed that the rebound rate of wet shotcrete is 10% in general,its Uniaxial compressive strength （UCS） for 28 d is 36.2 MPa, and its flexural strength is 3.2 MPa. These indexes are considerably better than that of dry shotcrete. So,the wet shotcrete technology is the developing tenden- cy of shotcrete.
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