A Selection about Material during the Coal Floor Grouting in Poor Aquifer

 

Cheng Yang

Postgraduate Student, State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China; e-mail: yangchengcumt@126.com

Haibo Bai

Professor, State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China; e-mail: hbbai@126.com

Xiaoqi Wei

Postgraduate Student, State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China; e-mail: weixiaoqi1988@163.com

Hailong Li

Postgraduate Student, State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China; e-mail: hailongcumt@126.com

 

 ABSTRACT

To enhance the fissure grouting effect in the poor aquifer under the coal seam and determine the grouting material and suitable proportion, an impact factor M is proposed and the effectiveness is proved through the situ grouting test in some coal mine. The test results show that: (1). The grouting effect is the best through using cement paste only; (2). The fall speed of grouting is accelerated when the concentration is increased; (3). The best proportion of cement paste is 1:1 to the grouting effect. The results help to choose the grouting material and suitable proportion and provide a precedent for the Floor Strata Strengthened by Grouting.

Keywords: Floor Strata Strengthened by Grouting, poor aquifer, grouting material, impact factor

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