The mineral components and microstructure of soft rock sampled from roadway floor in Xiagou pit are determined by X ray diffraction and scanning electron microscope. Combined with the test of expansion and water softe...The mineral components and microstructure of soft rock sampled from roadway floor in Xiagou pit are determined by X ray diffraction and scanning electron microscope. Combined with the test of expansion and water softening property of the soft rock, the roadway failure mechanism is analyzed, and the reasonable repair supporting principle of roadway is put forward.展开更多
In this study, the characteristics of geological structure at Qingshui coal mine were analyzed. And the hollow inclusion strain cell overcoring method was used to obtain the in situ stress. The effect of in situ stres...In this study, the characteristics of geological structure at Qingshui coal mine were analyzed. And the hollow inclusion strain cell overcoring method was used to obtain the in situ stress. The effect of in situ stress on the stability of soft rock roadway was analyzed. The results show that the maximum principal stress is in the horizontal direction with a northeast orientation and has a value of about 1.2–1.9 times larger than gravity; the right side of roadway roof and floor is easily subject to serious deformation and failure, and the in situ stress is found to be a major factor. This paper presents important information for developing countermeasures against the large deformation of the soft rock roadway at Qingshui coal mine.展开更多
文摘The mineral components and microstructure of soft rock sampled from roadway floor in Xiagou pit are determined by X ray diffraction and scanning electron microscope. Combined with the test of expansion and water softening property of the soft rock, the roadway failure mechanism is analyzed, and the reasonable repair supporting principle of roadway is put forward.
基金provided by the Beijing Natural Science Foundation(No.8142032)the National Natural Science Foundation of China(No.41040027)+2 种基金the State Key Program of National Natural Science of China(No.5113400)the Research Fund for the Doctoral Program of Higher Education(No.20130023110021)the Special Fund of Basic Research and Operating Expenses of State Key Laboratory of Geomechanics and Deep Underground Engineering,China University of Mining&Technology,Beijing
文摘In this study, the characteristics of geological structure at Qingshui coal mine were analyzed. And the hollow inclusion strain cell overcoring method was used to obtain the in situ stress. The effect of in situ stress on the stability of soft rock roadway was analyzed. The results show that the maximum principal stress is in the horizontal direction with a northeast orientation and has a value of about 1.2–1.9 times larger than gravity; the right side of roadway roof and floor is easily subject to serious deformation and failure, and the in situ stress is found to be a major factor. This paper presents important information for developing countermeasures against the large deformation of the soft rock roadway at Qingshui coal mine.
