水玻璃-固化剂固化地表冰碛物试验研究

Experimental Study on Surface Moraine Solidified by Sodium Silicate-Curing Agent

针对普朗铜矿矿区地质环境较为脆弱,开采过程中地表形成塌陷坑,以及在连续降雨量时地表冰碛物吸水饱和,易诱发井下泥石流灾害等问题,开展水玻璃-固化剂浆液胶凝时间和冰碛物土固结体强度的影响因素及影响规律试验。结果表明:水玻璃-固化剂混合液中,随催化剂的浓度增大时,浆液凝胶时间减小;水玻璃-固化剂浆液胶凝时间随固化剂浓度的增加呈先减小后增大规律;水玻璃-固化剂浆液胶凝时间随水玻璃浓度增加而减小;水玻璃浓度与固化剂浓度都对冰碛物固结体抗压强度起积极作用。实验结果可为地表冰碛物现场注浆固化提供理论依据。

The geological environment of Pulang copper mine is fragile,and collapse pits will be formed on the surface during mining.When continuous rainfall occurred,the surface moraine is saturated in water absorption and flows into the mine outlet,causing debris flow disaster in the underground.In response to this problem,experiments on the influencing factors and influencing rules about the gelling time of sodium silicate-curing agent slurry and the strength of moraine soil consolidation are carried out.The experimental results show that the slurry gels faster as the concentration of the catalyst increases in the mixture of sodium silicate-curing agent.The gelation time of sodium silicate-curing agent slurry decreases first and then increases with the concentration of curing agent increasing.Meanwhile,with the increase of sodium silicate′s concentration it will spend less time for sodium silicate-curing agent slurry gelling.In addition,both the concentration of sodium silicate and the concentration of curing agent have a positive effect on the compressive strength of the moraine consolidation body.The experimental results can provide a theoretical basis for the grouting solidification of surface moraine.