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.
This paper gives an description of the basic thinking of CFD simulation method, simulation was made on the flowing regularity of gob gas in 13118 working face with CFD model, and the simulated results were identical to the measured ones at the site, this indicates that it is feasible to use CFD model to simulate the flowing regularity of gob gas and the established CFD model is proper.
Beam Model-based Calculation for Safe Thickness of Roof in Mined-out Area
Shaanxi Seismic Network recorded 3 earthquakes of M_L 4.2,M_L3.2 and M_L 3.4 that took place in Shenmu and Fugu county of Shaanxi province respectively on October 14, November 21 and 29, 2004. The field investigation into these earthquakes in Yulin conducted by a group of the Administration of Shaanxi Province shows that 3 earthquakes are all typical mine quakes induced by collapse 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.