Experimental Study on the Performance of New Materials for Coal Mine Rock Mass Fractures and Pipeline Grouting under Dynamic Water Conditions
In response to the problems of long setting time,low retention rate,and poor water blocking effect under dynamic water conditions in coal mine rock mass fractures and pipelines,a new type of material for coal mine rock mass fractures and pipeline grouting under dynamic water conditions and its material properties were studied through indoor experiments.A single liquid slurry dynamic water grouting material was determined,and the setting time,fluidity,strength,and anti erosion performance of the dynamic water grouting material were tested,And analyzed the cost of new materials for coal mine rock mass fractures and pipeline grouting under dynamic water conditions.The research results indicate that under dynamic water conditions,new materials for coal mine rock mass fractures and pipeline grouting are mainly composed of sulphoaluminate cement,fly ash,mineral powder,limestone powder,steel slag powder,dispersible latex powder,hydroxypropyl methyl cellulose ether,sodium bentonite,ether polycarboxylate high-performance water reducing agent,white lignin fiber,and citric acid;When the ambient temperature is 20℃,the initial setting time is 40～75 minutes.By adjusting the amount of citric acid or increasing the mixing time,the initial setting time of the grouting material can be extended;The time period for maintaining the fluidity of the grouting material at 20±3 cm is 10～40 minutes,and the time for losing the fluidity is 15～50 minutes;When the water flow rate is 1.2 m/s,the anti erosion retention rate of coal mine rock fractures and pipeline grouting materials under dynamic water conditions is above 85%.When the flow rate is 0.6 m/s,the anti erosion retention rate is above 90%.When the flow rate is 0.2 m/s,the anti erosion retention rate is above 95%;The grouting material with a water cement ratio of 0.5∶1 has a strength of 7.1 MPa after 1 day;Under dynamic water conditions,coal mine rock mass fractures and pipeline grouting materials have good resistance to dynamic water erosion and low prices.They can adjust the initial setting time and loss of fluidity time according to different working conditions,meeting the water blocking needs of coal mine rock mass fractures and pipelines through long-distance single slurry grouting.
prevention and control of coal mine water hazardsdynamic water grouting materialretentionstrengthcracks and pipelines
万方数据
维普
