煤巷强帮支护理论与应用

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Abstract On the basis of analyzing destructive mechanism and reinforcement mechanism of coal roadway sidewall，concept design of protecting the roof by strong sidewall is put forward by means of establishing mechanical model of coal roadway，analyzing relationship between supporting force and Mohr circle，researching the width of limit equilibrium zone in sidewall and mechanism of roadway energy dissipation；and the theory of strong support for coal roadway sidewall is also theoretically demonstrated. FLAC3D is used to analyze surrounding rock?s mechanical response caused by coal roadway excavation and clarify influences of sidewall bolt on sidewall strength. So the theory of strong support for coal roadway sidewall is demonstrated through numerical simulation. Finally，theory of strong support for coal roadway sidewall is applied to coal roadway supporting design of Malan and Guandi mines. Good results have been obtained in these practices. The study results show as follows：(1) Improving the support strength of sidewall can not only enhance the bearing capacity of sidewall on the roof，but also reduce the width of limit equilibrium zone in sidewall as well as generalized span of roof. (2) Increasing strength ratio and stiffness ratio between the sidewall and roof can decrease quantity of plastic hinges in sidewall，which makes reasonable mechanism of roadway energy dissipation，ensuring the overall stability of coal roadway. (3) Using the concept design of protecting the roof by strong sidewall to support roadway which has lower strength in sidewall than roof can form the well function mechanism of protecting roof by strong sidewall，as well as the reasonable mechanism of roadway energy dissipation，which ensure the safety of coal roadway. (4) Increasing diameter，length，density of sidewall bolt can effectively control the deformation of surrounding rock and decrease limit equilibrium zone. (5) Both numerical simulation and field application indicate that improving the strength of sidewall can improve the overall stability. Theory of strong support for coal roadway sidewall has good applicability in engineering practice.

Key words： mining engineering coal roadway strong support for sidewall support theory stability numerical simulation anchor bolt support

Received: 15 October 2012

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/I7/1304

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