Based on the research on rock burst phenomenon induced by the breakage of thick and hard roof around roadways and working faces in coal mines, a criterion of rock burst induced by roof breakage （RBRB） was proposed a...Based on the research on rock burst phenomenon induced by the breakage of thick and hard roof around roadways and working faces in coal mines, a criterion of rock burst induced by roof breakage （RBRB） was proposed and the model was built. Through the model, a method calculating the varied stresses induced by roof breakage in support objects and coal body was proposed and a unified formula was derived for the calculation of stress increment on support objects and coal body under different breaking forms of roof. Whilst the formula for calculating dynamic load was derived by introducing dynamic index Kd. The formula was verified in Huating Mine by stress measurement. According to the formula for stress increment calculating, the sensitivities of dynamic load parameters were further studied. The results show that the thickness and breaking depth of roof, width of support objeet are the sensitive factors. Based on the discussion of the model, six associated effective methods for rock burst prevention are obtained.展开更多
The index of casualties is introduced for the trapped that is still alive after a destructive earthquake to indicate his (her) injury degree. In order to describe the injury-developing process controlled by three fact...The index of casualties is introduced for the trapped that is still alive after a destructive earthquake to indicate his (her) injury degree. In order to describe the injury-developing process controlled by three factors: the initial injury degree, the trap surroundings and the physique of the cornered, a function SFC (State-Function of Casualties) can be naturally constructed. Through parameter analysis from eight pieces of figures, it can be found that the trapped with weaker physique and worse initial injury degree and in more adverse trap surroundings deserves sooner rescue.展开更多
MASSIVE （mapping seismic vulnerability and risk of cities） is a GIS-based earthquake preparedness system that was developed under the European Union Civil Protection Mechanism project （GA No. 070401/2009/540429/SUB...MASSIVE （mapping seismic vulnerability and risk of cities） is a GIS-based earthquake preparedness system that was developed under the European Union Civil Protection Mechanism project （GA No. 070401/2009/540429/SUB/A4）, in order to provide civil protection authorities with accurate, and easily transferable tools for generating up-to-date maps of seismic hazard, seismic vulnerability and seismic risk of buildings, at the scale of the single building block. In addition, MASSIVE developed and ran state-of-the-art models to assess the risk for population evacuation in dense urban agglomerations given an earthquake event. The MASSIVE methodology was designed, implemented and validated considering two European pilot sites, heavily struck by recent earthquakes, which are the western part of the Larger Metropolitan Area of Athens （GR）, and the city of L＇ Aquila in the Abruzzo Region （IT）. The validation of the results using past earthquake records shows that the performance of MASSIVE is prosperous, achieving a correlation between the modeled and the on-site measured PGAs （peak ground accelerations） higher than 0.75, while the correlation between the on-site reported building damages and the ones predicted by the MASSIVE system has been of the order of 0.80.展开更多
基金Project(2010CB226805) supported by the National Basic Research Program of ChinaProjects(30370412,30670558) supported by the National Natural Science Foundation of ChinaProject(SKLCRSM10X05) supported by the Self-research Program of the Key Laboratory of Coal Resources and Safe Mining,China
文摘Based on the research on rock burst phenomenon induced by the breakage of thick and hard roof around roadways and working faces in coal mines, a criterion of rock burst induced by roof breakage （RBRB） was proposed and the model was built. Through the model, a method calculating the varied stresses induced by roof breakage in support objects and coal body was proposed and a unified formula was derived for the calculation of stress increment on support objects and coal body under different breaking forms of roof. Whilst the formula for calculating dynamic load was derived by introducing dynamic index Kd. The formula was verified in Huating Mine by stress measurement. According to the formula for stress increment calculating, the sensitivities of dynamic load parameters were further studied. The results show that the thickness and breaking depth of roof, width of support objeet are the sensitive factors. Based on the discussion of the model, six associated effective methods for rock burst prevention are obtained.
文摘The index of casualties is introduced for the trapped that is still alive after a destructive earthquake to indicate his (her) injury degree. In order to describe the injury-developing process controlled by three factors: the initial injury degree, the trap surroundings and the physique of the cornered, a function SFC (State-Function of Casualties) can be naturally constructed. Through parameter analysis from eight pieces of figures, it can be found that the trapped with weaker physique and worse initial injury degree and in more adverse trap surroundings deserves sooner rescue.
文摘MASSIVE （mapping seismic vulnerability and risk of cities） is a GIS-based earthquake preparedness system that was developed under the European Union Civil Protection Mechanism project （GA No. 070401/2009/540429/SUB/A4）, in order to provide civil protection authorities with accurate, and easily transferable tools for generating up-to-date maps of seismic hazard, seismic vulnerability and seismic risk of buildings, at the scale of the single building block. In addition, MASSIVE developed and ran state-of-the-art models to assess the risk for population evacuation in dense urban agglomerations given an earthquake event. The MASSIVE methodology was designed, implemented and validated considering two European pilot sites, heavily struck by recent earthquakes, which are the western part of the Larger Metropolitan Area of Athens （GR）, and the city of L＇ Aquila in the Abruzzo Region （IT）. The validation of the results using past earthquake records shows that the performance of MASSIVE is prosperous, achieving a correlation between the modeled and the on-site measured PGAs （peak ground accelerations） higher than 0.75, while the correlation between the on-site reported building damages and the ones predicted by the MASSIVE system has been of the order of 0.80.
