School of Resources and Safety Engineering, China University of Mining and Technology (Beiing) Shanxi
Jincheng Anthracite Mining Group Corporation Limited

为分析新型无机注浆材料的性能及其在破碎围岩中的应用效果,采用实验室试验的方法研究了水灰比对浆体的流动度、凝结时间和抗压强度3个指标的影响,并对试验巷道围岩变形量及围岩破碎情况进行观测。结果表明:水灰比越大,流动度就越大,当水灰质量比为0.7∶1.0时,浆体的扩展度为265 mm,满足要求;抗压强度随水灰比增大而减小,水灰质量比大于0.9∶1.0时,抗压强度不能满足要求,因此,水灰比应为(0.7~0.9)∶1.0。注浆后煤体内部的裂隙得到充填和固结,钻孔内浆液固结体呈薄厚不一的片状或条状,空隙得到压实,煤体完整性和稳定性增加。

In order to analyze the performances of new organic grouting material and applied effect in the broken surrounding rock, a lab experiment method was a pplied to study a water cement ratio affected to three indexes of grout fluidity, setting time and compressive strength and an observation was conducted on the surround ing deformation value and surrounding broken condition of the trial roadway.The results showed that the higher the water cement ratio was and the higher the fluidity w ould be.When the water cement ratio was 0.7 : 1.0, the spreading degree of the grout would be 265 mm and could meet the requirements.The compressive strength wo uld be reduced with the water cement ratio increased.When the water cement ratio was over 0.9: 1.0, the compressive strength could not meet the requirements.There fore, the water cement ratio should be (0.7 ~ 0.9) : 1.0.After the grouting operation completed, the cracks in the coal would be backilled and consolidated.The grout C onsolidation in the borehole would be in sheet with different thickness or in strip, thus the spaces in the borehole were compacted and the coal integrality and stability w ere improved.

山西省科技重大专项资助项目(20121101002)；