Analysis On Structure Mechanics Of "Double Shell" Support In Deep Roadway

Roadway is at the top of mine construction engineering, stability of roadwaysurrounding rock stress environment, supporting structures, supporting strength, sectiontypes, such as multiple factors. Showing deep roadway surrounding rock deformation oflong duration, speed deformation, deformation, deformation space, features sensitivedeformation affected by mining, in high stress roadway in deep soft rock show obviousengineering property of rock, governance is a roadway in deep soft rock roadwayproblems. Engineering practice showed that surrounding rocks of roadway surroundingrock deformation and instability is mainly structural instability, stability of retainingstructure is the focus of roadway and the key to deep mine soft rock roadwaydeformation and failure characteristics, combined with the mechanical analysis ofsupporting structure stability proposed continuous "double hull" treatment method ofstability of surrounding rock of deep mine soft rock roadway. For deep high stress softrock roadway support issues using field measurement, research, theory, simulations,laboratory experiments and numerical simulation in physics experiment and otherresearch methods for continuous "double hull" Shell--Shell formed support mechanismand technology of coupling support system research, the main conclusions are asfollows:(1) Created has three dimensional similar simulation experiment model, throughimposed gradient vertical pressure, experiment found roadway surrounding rock stressin deformation development process in the gradually to deep Department transfer,shallow Department surrounding rock stress release, in the deep Departmentsurrounding rock became should advocated bearing carrier; through numericalsimulation compared analysis round roadway and straight wall semicircular archedroadway with buried deep of changes surrounding rock stress, and displacement andplastic district development law, summary obtained round roadway sharply reduceddeep Department roadway surrounding rock moved near volume, reduced surroundingrock plastic damage degree, reduced surrounding rock concentrated pressure effectsregional, To control surrounding rock stability of deep roadway, roadway floor heavecontrol in particular.(2) Study on creep deformation of surrounding rock of roadway, uniaxial and triaxial creep experiment of rock, reveals the vertical pressure, effect of confiningpressure on deformation and stability of Rock; after rock ultimate strength in uniaxialand triaxial creep tests illustrate the meaning of roadway support in a timely manner, aswell as the principle of improving the strength of support.(3) Based on improving the mechanical properties of the surrounding rock ofroadway surrounding rock supporting pressure, reducing, changing stress state ofsurrounding rock, presents a continuous "double hull" supporting concepts, shallow+pre-Grouting of roadway bolt support forms a shallow support shell, deep grout+reinforced by prestressed anchor cable forming deep shell. Shallow shells to improvethe mechanical properties of rock, increase cohesion and inner frictional angle of thesurrounding rock, improving the strength and stiffness of the surrounding rock, shallowrock structures change; deep grout filling cemented rock fractures deep grouting andcable together form a closed ring of a certain thickness of the shell.(4) Proposed has support nursing shell--reinforcement shell coupled supportnursing theory and method, and analysis has support nursing shell--reinforcement shellcoupled support nursing mechanism, proposed has "reasonable select roadway section,maintenance roadway surrounding rock structure, once let pressure, and II timesanti-pressure support nursing" of support nursing concept and "unloading pressure letpressure, anti-pressure resistance pressure, unloading let moderate, letanti-coordination" of support nursing principles.