Comprehensive exploration management and development characteristics of decline-death type collapse column
In order to study the development characteristics of the decline-death collapse column of the North China coalfield and its influence on mining,the 221302 working face transportation roadway of Xiaojiawa Coal Mine was taken as an example,the exploration and treatment of the collapse column were investigated and the distribution location and range of the karst collapse column were explored by the integrated geophysical exploration and drilling on the surface and underground.The main components of the cement of the collapse column were analyzed by X diffraction and scanning electron microscopy,based on the abnormal phenomena such as drilling hole water inrush,grouting amount and collapse hole,the developmental morphological characteristics of the collapse column are inferred.The results show that the geological anomalies are detected as a conical V-shaped column;the upper part The filling material compaction cement is good,the water conductivity is poor,and the lower part has general water conductivity,which is divided into"decay-death"type,including rock pile section,transition section;After the grouting treatment of the collapse column,there was no abnormality in the inspection hole,there was no water inrush on the excavation face,and the floor water-resisting layer thickness is much larger than the required safety thickness for tunneling,thus the tunneling safety can be ensured.
North China coalfieldkarst collapse columngrouting treatmentdevelopment characteristics of collapse column
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NSTL
万方数据
