| With the increase of mining depth, coal roadway support problem became more important, the deep surrounding rock shows soft rock properties. Grouting as a kind of support method, it is often used to solve the problem of soft rock bolting broken. It can effectively control the surrounding rock deformation and obviously improve supporting result, being used widely. But there are not sufficient research in the theory of this area. Through the similar materials simulation tests, the anchor rock fracture grouting and the deformation law of development were summarized, through the analysis in anchor rock loading of stress-strain curve. The changes of E, C,φof surrounding rock anchor solid under the condition of grouting and anchor bracing were figured out with the Mohr-Coulomb criterion and Hooke's law. Characteristics of the grouting improving surrounding rock mechanics properties of the crushing zone were analyzed.This thesis adopts that the broken rock will be cemented together by grouting, and it can effectively improve elasticity modulus. According to the results, grouting has more effect on C than anchor bolt. On no anchor bole condition C increased 34%, while on anchor bolt condition C increased 67%. It shows that anchor combined bolting can play injection better supporting effect. Grouting can improve the anchorage body'sφ. After grouting the anchorage body'sφvalue maximum increased 2%.Combined with engineering example, according to the geological conditions of pump water -250 actual in mine roadway Hebi No.4 Coal Mine, FLAC3D was adopted for the three-dimensional numerical simulation. The design of supporting schemes were optimized. The surrounding rock stresses, displacements, and plastic zone distribution characteristics under different circumstances were analyzed. The laws obtained from the similar simulation tests were qualitative verified. |
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