<正> By the generalized Kelvin creep model,rheological characteristics of deep softrock and long-term mechanical behaviors of support structures were simulated.
<正> Presented measurement results of roof rocks and wall rock movements of un- derground development workings after their drifting.The research was carried out
<正> An active measurement method and its principle was introduced consideringthe low success rate,special difficulty,and long measurement time of the direct ga
<正> Based on a comprehensive analysis of the structure and existing problems ofthe gear pump, provided a structure principle of a synchronous gear pump.The dis