The application of roof-cutting and pressure-relief gob-side entry retention plays a critical role in controlling the stability surrounding rock at entry, easing continuity tension improving resource recovery ratio. excavation 360,803 airway Xinji No. 1 Mine is affected by intense mining 360,805 working face. Hence, to address problem airway, mass blast weakening theory was used this study anal...

The Taiyuan Formation limestone aquifer and Ordovician are widely distributed in the coal seam floor of measures North China; water hazard safety problem stope under influence mining is very prominent. risk inrush from closely related to degree full exploitation, so it necessary study stability conditions, especially working face length effect on stability. Through numerical simulation water-ro...

A roof provides protection to be safe from direct sunlight. From the shelter, shadow alone is not expected. Durability, sustainability, less life cycle cost, and low maintenance cost are expected from a selected roof. The world has a thirst to have a best roof. No roof will fulfil the requirement of humanity since the climatic conditions are different. Hence the roof should be selected accordin...

The roof garden has great functioning of smoothing the shortage of land resource in the city and making use of the land resource diversity and efficiently. The modern era, following the fast development of economic and society, people have a high claim to green roof or roof garden. It is an efficient and reasonable way to exploit the open space the roof of the building. From the classic roof ...

The article analyzes the issue of reliable estimate unloading extent and variation order coal-rock massif geomechanical characteristics as a result hydraulic fracturing undertaken from mine workings. For this purpose it is proposed to use value studied rock mass. In case possibility comparison with geological actual data doesn’t exist, option using mass classification based on estimated geophys...

The key parameters of pressure relief pre-splitting blasting technology (PRPBT) contribute to the implementation effect goaf-side entry by roof cutting (GSERC). This study is an attempt design including height, angle, spacing between boreholes, charge structure and sealing length using theoretical analysis, numerical simulation field implementation. basic quality index main 666.27, combined wit...

Rock burst is a catastrophic phenomenon that often occurs in underground rock mass engineering. In order to reveal the essence of hard roof process roadway excavation, particle discrete element method used establish model and simulate disturbance harmonic dynamic load based on analysis accident deep mine. The crack field, stress displacement kinetic energy surrounding disturbed by cyclic were a...

A powered roof support is an element of a longwall complex. It connected with scraper conveyor by sliding system. The carries shearer mining the coal. second function to protect excavation against uncontrolled impact rock mass. This paper focuses on analysis effectiveness support. main objective determine factors influencing failure-free operation in exploitation process. Moreover, author discu...