| The mechanism of the floor heave of soft rock roadways and control technology research has been one of the problems in mining subject for a long time. Many experts and scholars at home and abroad did a lot of research work gaining a series of significant achievements about mine floor heave Mechanism and control technology. However, because of the complexity of the condition of the surrounding rock and the stress environment, the current theory could not often solve the problem of the floor heave of roadways completely. Besides, the traditional control technology of the floor heave is mainly around the roadway floor or two sides ignoring that the processing of roof contributes to the control about the floor heave, especially when the roof exist one layer or layers of hard rock, the influence of the floor heave are more larger and more wider. Based on this, the thesis takes Zhang cun mine as the engineering background, the roadway floor heave mechanism and coupling shoring technology were researched by using theoretical analysis and numerical simulation and filed practice. Through specific research work and getting some beneficial summaries as follows:(1) Engineering geology of coal2203gas emission roadway in zhang cun mine were conducted, physical mechanics such as elastic modulus, Poisson’s ratio, compressive strength and other parameters were measured in the laboratory with the sampling of coal and rock. In the20m roof scope rock fissures case observations, the results showed that:the roof rock strength and rock structures integrity and the larger fissure broken area only appear in some areas.(2) The main factors influencing the floor heave of roadway in Zhang cun mine were studied, including stress state, rock nature, water management nature, supporting strength, etc. It draw a conclusion that the floor heave was from liquidity squeezing in the roadway. The deformation resulted by plastic deformation, expansion, kick drum and theology caused by the amount of water was calculated through the theoretical analysis. It were summarized that the properties of surrounding rock,supporting mode and bearing stress caused by mining influence were the main causing factor. The control of the floor heave of roadway were mainly in the angle of the bearing stress, surrounding rock properties and roadway support. The liquidity extrusion damage characteristics of the floor heave is analyzed by using theory. The floor destruction type of roadway under the dynamic pressure condition was studied by using soil mechanics and elastic-plastic mechanics.(3) The roadway of the original support scheme, pre-splitting roof and two sides grouting reinforcement were numerically simulated by using the Flac3D software. Compared with elastic-plastic analysis of regional distribution, stress distribution and displacement distribution, the pre-splitting roof and two grouting support scheme can be used effectively to control the large deformation of roadway floor. And the reasonable pillar width was optimized by comparing deformation and stress distribution of surrounding rock of roadway under the different coal pillar width.(4) Based on the mechanism of the floor heave of roadway in coal mine and the control countermeasures, combined supporting including the pre-splitting roof, two sides grouting reinforcement and anchor reinforcement floor were put forward, The support parameters were determined by the theoretical calculation. |
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