English
Abstracts
of
This
Issue
Study on Relation of Variation of Coal Conductivity with Gas
Pressure ( 1) - In this paper, theoretical analysis is made on the
gas absorption characteristics of coal and the influence of absorbed
gas and free gas upon coal conductivity. Experimental study is made
on the variation relation of coal conductivity with gas pressure by
measuring the conductivity of different coal samples under different
gas pressure in the laboratory, and the theoretical study results are
thus confirmed.
Experimental Study on Formation of Flame and Shock Wave in
Gas Explosion ( 4) - In the process of a gas explosion, both flame
and shock wave are two factors for determining hazard degree of an
accident. In this paper, the variation of flame and pressure in gas
explosion propagation has been determined experimentally,
and
research is made on the characters of flame and shock wave in the
gas explosion. The research results show that the turbulent effect is
the key factor for the acceleration of flame propagation and the
formation of shock wave in the process of flame propagation of a gas
explosion, and the flame propagating speed has a direct influence
upon the formation and enhancement degree of the shock wave in the
explosion. On the basis of the experimental study results, the paper
puts forward some suggestions for the prevention of gas explosion in
coal mines.
Criterion for Rock Burst in Tunnel and Its Forecast ( 7) -
Rock burst is a common geological disaster of dynamic destabilization
in excavation of the underground engineering chamber in high stress
area. In this paper, the authors,
by analyzing the stress of
surrounding rock of a circular tunnel and the characteristics of crack
extension within the surrounding rock after excavation and using the
destruction criterion of Griffith strength theory, obtained the criterion
expressed by the tensile strength of rock for rock burst occurred in
the tunnel excavation, which can be used for better prediction of
rock burst. The authors put forward the prediction method for rock
burst by theoretical analysis and site measurement according to the
characteristics of rock burst occurred in the tunnel. This research
result can be used for similar projects for reference.
Research on Water Accumulating Volume in Mine Gob ( 10) -
The mining and water drainage design of a coal mine threatened by
water disaster is a complicated systematic project. In this paper, the
authors, taking the hydrogeological conditions of Qinshui Coal Field
as background, based on deep analysis of the water inrush cause in
each mine and through the collection of a great deal of data and
simulating tests in the laboratory,
put forward such a major
conception of water - accumulation coefficient, which is of great
importance to the prevention of water inrush in working faces and the
guaranteeing of safe production in mines and has a guiding
significance for the mining and water drainage design of mines
threatened by water disasters.
Experimental Study on Catalytic Oxidation Method with
Fentong Reagent for Treatment of Coking Wastewater ( 12) -
Based on the experiment of treatment of coking wastewater through
catalytic oxidation with Fenton ( Fe
2+
+ H
2
O
2
) reagent, this paper
emphatically compares treatment results under different reaction
conditions and discusses their influencing factors. Experiments of
removing COD and phenol from wastewater from Chongqing Steel and
Iron Group# Coking works were conducted under 6 different reaction
conditions, i. e. reaction time, pH, the plunged quantity of Fenton
reagent, the dosing of Fenton reagent, reaction temperature, and the
way of plunging. Raw wastewater was used in the experimental
removal of COD and diluted wastewater with as much distilled water
in the experimental removal of phenol. The experiment results show
that the removal rate of COD and phenol stands at 88. 12% and 89.
45% respectively, an optimum treatment, with reaction temperature
at 25∃ , pH at 3, reaction time lasting 5 minutes and the ratio of
H
2
O
2
to COD and Fe
2+
to H
2
O
2
being 2%1 and 10%1 respectively .
Probing into Industrial Injury Insurance Rate System of
Chongqing ( 14) - This paper made an analysis on the industrial
injury insurance rate system based on the investigation on industrial
injury situation of 102 enterprises in 39 trades from 1988 to 2000 in
Chongqing. The target of this investigation can be divided into 12
risk grades be formed into different rate. The supreme rate thus
formed is 7. 0% and minimum rate is 0. 2% .
Application of Assessment Method with Fire and Explosion
Indexes in Safety Assessment on Dangerous Chemical Production
Enterprise( 20) - This paper gives a description of the application
of assessment method with DOW chemical fire and explosion indexes
in safety assessment of dangerous chemical production unit. Study
results show that the use of DOW chemical fire and explosion indexes
to assess the safety situation of the dangerous chemical production
unit can not only more accurately reflect the actual situation of the
unit to be assessed, but also predict the economic loss caused by the
safety accident once it happened.
Discussion on Hazard Evaluation of Mine Gas Accumulation
Based on Information Entropy ( 25) -
Gas accumulation in a
mine roadway is a prerequisite condition for the occurrence of gas
accidents. In this paper, the authors defined the conception of
information entropy of mine gas accumulation and gave the
calculation formula. The analysis on the actual cases of gas
accumulation in the winning district shows that this index can reflect
not only the hazard degree of gas accumulation, but also the
influence of uncertain factors of gas accumulation hazard, so the
analysis and evaluation of gas accumulation hazard based on
information entropy have further value for theoretical exploration.
Inquiring into Development of Processing Industry of Superior
Mineral Resources in Chongqing ( 27) - This paper, starting with
the analysis on the superior mineral resources and the present state of
the processing industry of superior mineral resources in Chongqing,
points out the problems present in the development of the processing
industry of superior mineral resources in Chongqing in the face of
both the international and domestic markets, and puts forward the
development orientation and guarantee measures for the processing
industry of 8 superior mineral resources in Chongqing.
Review on Artificial Wetland for Treatment of Acid Mime
Water ( 40) - This paper summarized the treatment method for acid
mine water with artificial wetland, mainly including the basic
structure and type of the artificial wetland, its decontaminating
mechanism, the factors that affect decontamination effect as well as
the technological design, treatment effect and development trend of
the artificial wetland.
Length Determination of Super- long Fully Mechanized Caving
Face of Inflammable Thick Seam and Its Layout ( 64) - This
paper analyzed the ability of production, transport and support of the
super - long fully mechanized caving face of inflammable thick
seam, its mining method and technology, the requirements for gas,
ventilation and fire control as well as the ability of production, on-
the- spot and technical management so as to determine the length of
the super - long fully mechanized caving face and the layout
requirement and reliability in the inflammable thick seam. This can
be used by similar coal mining areas for reference.
Distribution Characteristics of F02 Fault in Nappe Structure of
Xinji Mine Field ( 66) - Based on the analysis and exploratory
verification of the mechanism of the nappe structure of Huainan coal
field, this paper made research on the occurrence and distribution
characteristics of F02 fault in the nappe structure, negated the
existence of plane structural surface on the two sides of Xinji
& structural window∋ and put forward the possibility of F02 fault
position shifting towards north. T he fact showed that this research
result is correct and can be used as the technical basis for
determining the position of the open - off cut of 1309 fully
mechanized caving face of Xinji No. 1 Mine.
Vol. 32 No . 2 2005
MINING SAFETY & ENVIRONMENTAL PROTECTION
April 2005