Application And Research Of The Soundless Cracking Agent In Mining Working Face End Hanging Roof

The soundless cracking agent (SCA) is a kind of expansive Powder Which Produced expansion of solids and swelling Pressure after the hydration reaction, became Popular for cutting or cracking rock, concrete, stone and other brittle solid materials. SCA has many advantages in breaking Process, Which includes no blasting wave, no quake, no noises, no flying stone and no Poisonous gas etc. It is an important development and supplement to the traditional blasting technology.By the method of academic study and testing in laboratory, the thesis researches the rock’s cracked mechanism and discusses the effect that The Static Cracking Agent (SCA) is applied in the work of colliery exploitation. Placed lancing-pipe in hole and observe the effect that the lancings lead the cracks’spread when the sample is been breaking; after adding notch-cuttings in the wall of rounded hole, observe the effect that the wedge angle of notch-cuttings lead the cracks’spread; for the sample with several holes, observe the effect that empty holes lead the cracks’spread of holes with SCA.Finally, based on experiment, application of soundless creaking agent at Mining working face end hanging roof in LM coal mines different fragmentation Parameters were settled, the corresponding construction technology was constituted, and obtained result. The Practice indicates that SCA Provides reliable Performance, good creaking effete, simple and convenient construction, high safety. It has outstanding economic results and comprehensive Practical significance.