Study On The Surround Rock Control And Mechanism Of Large Deformation Roadway Under Mining Influence

Due to mining influence, surrounding large deformation phenomenon often occur in practical production, which caused difficult construction or even engineering termination, it has become the hot issue to be urgent solved. Therefore, with the help of predecessor’s theory, this article reveals the large deformation mechanism of mining influence roadway and draw a conclusionThat principle of support and surrounding rock common carrying and surrounding rock control method, by using theory analysis and numerical simulation methods doing research about the large deformation characteristics of roadway under mining influence, the surrounding rock of stress distribution, the removed regularity of surrounding rock, and surrounding rock control principle and methods; Under the engineering background of the Da Ning coal mine502roadway in Ya Mei and according to the actual situation, it uses theoretical analysis and combines laboratory experiments with numerical simulation to analyse geteway of deformation mechanism and destruction features in different mining influence stages, finally carries on reasonable supporting design; Applying field measurement method for feedback of supporting monitor, furthermore test the supporting scheme of rationality. Through a series of research, I get some beneficial summaries as follows:1) Through studying the mining roadway deformation and surrounding rock stress distribution rule, this paper got that mining surrounding rock stress and structure change have dynamic features and determined inevitability and controllable of mining roadway’s large deformation characteristics.2) Using theory of complex variables functions and conformal transformation to analyse surrounding rock stress and strain regulations, it measured roadway of axial stress changed law under different pressure, at the same time got different depth-span ratio stress distribution characters of surrounding rock.3) It summed up that the deformation and failure mechanism and characteristics of mining roadway in different stages,by using numerical simulation to analyse surrounding rock’s migration rule under different stages of mining roadway.4) Through researching on the the relationship between supporting and surrounding rock joint action, realized pressure and displacement of surrounding rock exist the changed rule of volatility, it was based on these conclusion and got some surrounding rock control methods such as small pre-tightening force and large anchoring strength, slightly arched changed surrounding rock’s stress characteristics, boundary anchorage, whole anchorage, reasonable supporting time and supporting force.5) Through anchor and cable’s ejection hurt theory of analysis in the large deformation of roadway, put forward using the cap to prevent the pop-up anchor technology.6) Having analysed geological structure, the original rock stress and mining influence of the Da Ning coal mine502roadway in Ya Mei,showed different damage mechanism of roadway in different stages, the paper put forward the reasonable support scheme, at the same time through numerical simulation and site monitoring, determined the rationality of the scheme once again.