铁路下伏采空区注浆材料配比试验研究

Experimental Research on Mixing Ratio of Grouting Material for Goaf under Railway

铁路沿线下伏采空区严重威胁铁路运输安全，可采用注浆充填法进行处置。对于注浆法充填采空区，注浆材料选择至关重要，需根据采空区特征合理确定注浆材料和浆液配比。本文通过不同注浆材料配比试验研究，确定了合理的注浆材料和浆液配比。研究结果表明，冒落采空区选择水泥粉煤灰浆液作为注浆材料，配合比以水固比1：1．2、固相比2：8，水玻璃掺量3％最佳；空化区选择水泥、粉煤灰、砂和细石混合浆液作为注浆材料，建议选取水胶比0．5，砂率0．38～0．42方案配置；当采空区形式介于有冒落采空区和空化区之间时，可根据实际情况，在水泥粉煤灰浆液中加少量中粗砂，形成水泥粉煤灰砂浆，其配合比以水胶比0．98、胶砂比0．5、水玻璃掺量3％最佳。

The safety of railway transportation is threatened by the underlying coal mine goaf along railway, which can be disposed by grouting method. For using grouting method to stow goal, selecting grouting material is of particular importance. Grouting materials and mixing ratio of grout should be determined reasonably according to the characteristics of goaf. The reasonable grouting materials and mixture ratio is ascertained by the experimental study of proportion of different grouting materials. The results show that cement and fly ash grout is selected as grouting material in caving goaf. The optimum mixture ratio is： water/solid 1 to 1.2, solid phase ratio 2 to 8, water glass 3%. Cement, fly ash, sand and fine stone slurry is selected as grouting material in cavitation goaf. By experiment, adding 38%-42% sand into grouting material and water-binder ratio 0.5, an relatively ideal mixture ratio can be obtained. When it comes to the form between caving goal and cavitation goaf, adding medium-coarse sand into cement and fly ash grout, water-binder ratio 0.98, cement-sand ratio 0.5 and water glass 3%, the optimum mixture ratio can be gained in practical project application.