The Research Of Mechanism And Control Technology Of Floor Heave Of Roof Roadway Under The Dynamic Pressure Influence

For a long time, many experts and scholars at home and abroad did a lot of research work about mine floor heave mechanism and control technology, gained a lot of important research results, put forward a number of heave control practical technology. However, because of complexity of the nature of the surrounding rock,the stress environment and the the geological environment, the current theory cannot be completely solve the problem of understanding the heave mechanism, the existing technology is difficult to control floor heave fundamentally. With the continuous advancement of mining technology and the increase of mining depth, the problem of heave has become more prominent. Therefore, continue to conduct research work of floor heave of soft rock tunnel still has important theoretical significance and application value.In this paper, mechanical calculation model of floor heave under the influence of mining is established, the conclusion is which the influence of mining for roadway is very big when surrounding rock is broken up or lithology is poor; based on the engineering practice of south sing roadways in Wolonghu coal mine, the rock components and broken rock zone of the surrounding rock is tested and analyzed, we can know that the rock is weak expansile, and south sing roadways belong to the roadway of which broken rock zone is especially big. The impact of mining for roadways is simulated by use of FLAC2D software, the simulation results show that: the protection pillar must remain located 100 to 120 meters above, roadway can escape the mining effects. Integrated with the surrounding rock characteristics and numerical simulation conclusion, the main reasons of floor heave is revealed, the type of floor heave belongs to squeezing flow type and expanded type floor heave.Studing the force features of the roadway, combined with the floor heave mechanism of south sing roadways, the supporting design principle is put forward, which is surrounding rock stress transfer principle,new enhancement technology which is twice support being the bolting with wire mesh and shotcrete and ordinary enhancement technology of bolt-grouting. At the same time, because of the existing grouting theory far behind the engineering practice, the diffusion characteristics of slurry is simulated by use of UDEC software in bolt-grouting roadway, providing the basis for design of ordinary enhancement technology of bolt-grouting.Finally, according to the aforementioned work, roadway repair reinforcement of of south sing roadways is proposed.Industrial test results show that the roadway is in good condition in early stage of repir, in addition, the reasons of violent deformation in later stage is analyzed. The research results a certain reference value to control floor heave for similar roadwav.