The roof separation was investigated in a coal mine as part of the site charac- terization of roof strata deterioration in a longwall roadway. The separation of laminated, weak roof strata was initially characterized ...The roof separation was investigated in a coal mine as part of the site charac- terization of roof strata deterioration in a longwall roadway. The separation of laminated, weak roof strata was initially characterized as the maximum separation, effect of geologi- cal setting on separation and the effect of mining activities (heading development, time-dependent and longwall extraction) on separation. Then the separation process was studied, so as to answer the questions of: when the separation occurs;where the separa- tion is located and what geological setting it relates to;how large of the separation is;and how the separation propagates.展开更多
The weak and broken roof,explosive control and other problems seriously restrict the promotion of non coal pillar self-forming roadway technology.In order to solve such problems,a new method of non coal pillar self-fo...The weak and broken roof,explosive control and other problems seriously restrict the promotion of non coal pillar self-forming roadway technology.In order to solve such problems,a new method of non coal pillar self-forming roadway through non-blasting roof cutting and pressure relief was proposed in this study.A systematic research system of"theoretical analysis-physical experiment-engineering verification"was constructed with the 9103 working face of Longmenta Coal Mine as the research object.Firstly,the theoretical analysis was conducted to reveal the roof cutting mechanics mechanism of rock mass weakened by dense drilling,establish the design criteria for key drilling parameters,and obtain the key design parameters of dense drilling in the test working face.Secondly,the physical model test was conducted to make clear that the dense drilling method can directionally cut off the goaf roof along the set position,reducing the stress and deformation of the roadway surrounding rock.Finally,the field engineering tests were conducted,and monitoring results showed that the pressure relief effect of the dense drilling method was comparable to that of the directional blasting method,achieving non coal pillar self-forming roadway mining under non blasting conditions.展开更多
文摘The roof separation was investigated in a coal mine as part of the site charac- terization of roof strata deterioration in a longwall roadway. The separation of laminated, weak roof strata was initially characterized as the maximum separation, effect of geologi- cal setting on separation and the effect of mining activities (heading development, time-dependent and longwall extraction) on separation. Then the separation process was studied, so as to answer the questions of: when the separation occurs;where the separa- tion is located and what geological setting it relates to;how large of the separation is;and how the separation propagates.
基金Project(2024YFC2909500)supported by the National Key Research and Development Program of ChinaProjects(42377148,52204164)supported by the National Natural Science Foundation of ChinaProject(2022XJSB03)supported by the Fundamental Research Funds for the Central Universities,China。
文摘The weak and broken roof,explosive control and other problems seriously restrict the promotion of non coal pillar self-forming roadway technology.In order to solve such problems,a new method of non coal pillar self-forming roadway through non-blasting roof cutting and pressure relief was proposed in this study.A systematic research system of"theoretical analysis-physical experiment-engineering verification"was constructed with the 9103 working face of Longmenta Coal Mine as the research object.Firstly,the theoretical analysis was conducted to reveal the roof cutting mechanics mechanism of rock mass weakened by dense drilling,establish the design criteria for key drilling parameters,and obtain the key design parameters of dense drilling in the test working face.Secondly,the physical model test was conducted to make clear that the dense drilling method can directionally cut off the goaf roof along the set position,reducing the stress and deformation of the roadway surrounding rock.Finally,the field engineering tests were conducted,and monitoring results showed that the pressure relief effect of the dense drilling method was comparable to that of the directional blasting method,achieving non coal pillar self-forming roadway mining under non blasting conditions.
