In this paper, the basic method for COSFLOW simulation prediction was described, the simulation and prediction were conducted on the gas emission in Face 1242 (1) and 13118 and gas drainage from gob by surface boreholes in Hanqiao Coal Mine with the build COSFLOW model, and the predicted results tallied with the actually measured results at the site, this indicated that it is feasible to use COSFLOW model for the prediction of gas emission in coal face and gas drainage from gob.
The paper uses the method of joint of the dynamics of porous media, computer simulation and field test, studies the parameter of Fire-Prevention Techniques in Nitrogen-Injection of Mechanized Top Caving Mining of Shallow Thick Seam in mined-out area.
An approximate theory to predict the event of main and periodic roof falls in the goaf behind the long wall face is given.
It describes recently closed collieries and their make of water, and details the migration of these quantities through a variety of roadways and goaf areas to the new lodgement facilities to be installed at Bentinck Colliery.
Consequently, the results obtained by using the fuzzy influence function method can automatically give rise to a shift of the inflection point towards the goaf and asymmetry in shape.
On one approach to calculation of the stress-strain state of a rock mass in the vicinity of a goaf
The stress-strain state of the rock mass is evaluated, with increase in depth of the deposit mining and volume of the mine goaf.
Based on H.263+, by reversing part stream sequences of each Group Of Block (GOB), an error resilient scheme is presented to improve video robustness without additional bandwidth burden.
And applying the catastrophe theory, the influencing factors of induction caving roof are studied in the emptied areas, such as the mechanical property of the surrounding rock, the area of the gob, the scope and dimension of tensile stress.
The results show that the key factor is the area of the gob to the method of the induction caving roof.
In goblet (gob) mutants, the SAM terminates following cotyledon production, but occasionally partially recovers and produces simple leaves.
We examined the recharge sources of acid mine drainage (AMD) seeps that form at the toe of the coal refuse (gob) pile at a site in Indiana, using traditional geochemistry and oxygen isotopes.