With the increase of depth underground engineering, phenomenon splitting failure deep rock will appear, which is very different from shallow cavern. In order to reveal formation mechanism failure, mechanical model test and numerical simulations were carried out respectively. Using Pubugou Hydropower Station as engineering background, a three-dimensional (3D) geomechanical was conducted relying ...

Rock burst is one of the disaster accidents that can easily happen in rock cavern engineering. At present, most commonly used methods to control borehole pressure relief technology. In this paper, influence drilling layout schemes on effect surrounding mass systematically studied. The research results show strength reduction degree, AE evolution characteristics, failure modes samples with diffe...

Underground caverns of hydropower project have significant mechanical properties high stress, sidewall, large span, complex geological conditions and mutual disturbance adjacent cavern construction, resulting in very deformation rupture characteristics. Through the laboratory triaxial compression experiments, response failure mechanism granite is explored, elastic-brittle are also revealed. Wit...

The left bank of the cushion pond Baihetan hydropower station is a slant and dip slope. gently inclined intra-layer fault zones, steep-dip faults unloading fissures cutting slope to form several potentially unstable blocks. computational results show that stabilities blocks are controlled by zones. A method treatment applying deep replacement caverns load-reduction excavation was proposed reinf...

In the process of building a new power system with energy sources as mainstay, wind and photovoltaic enter multiplication stage randomness uncertainty, foundation support role large-scale long-time storage is highlighted. Considering advantages hydrogen in large-scale, cross-seasonal cross-regional aspects, necessity, feasibility economy participation under are discussed. Firstly, supply demand...

For a good management and precise tracks of hydrogen quantities stored in salt caverns, this paper presents study on transport rock during cycling. It provides novel mathematical–numerical model that couples the cavern thermodynamics with mechanisms saturated fully coupled thermo–hydraulic framework. Both two–phase Darcian percolation Fickian diffusion are used to account for migration intersti...

The underground powerhouse of a hydropower station, in the form cavern group, is generally characterized by large scale and complicated spatial structure. During construction phase, extensive excavation limited space may cause multi-cavern effect between adjacent caverns thus lead to deformation failure surrounding rock mass, which undoubtedly compromises stability safety. This paper takes drai...

conclusions vacuum-assisted abdominal closure is a good technique for temporary abdominal closure. in patients who are unable to achieve fascial closure, skin closure alone is safe. results after 157 trauma laparotomies, 35 (22%) were open abdomen cases with an average injury severity score was 35. ninety-four percent of open abdomens occurred after damage-control surgery. temporary vacuum-assi...