CN106596248B - A kind of side slope isolated coal pillar width based on coal sample creep test determines method - Google Patents

A kind of side slope isolated coal pillar width based on coal sample creep test determines method Download PDF

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Publication number
CN106596248B
CN106596248B CN201611216202.5A CN201611216202A CN106596248B CN 106596248 B CN106596248 B CN 106596248B CN 201611216202 A CN201611216202 A CN 201611216202A CN 106596248 B CN106596248 B CN 106596248B
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coal
stress
coal sample
time
pillar width
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CN106596248A (en
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王东
姜聚宇
韩新平
南存全
邓春生
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JARUD BANNER ZAHAZUOER COAL INDUSTRY Co.,Ltd.
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Liaoning Technical University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058Kind of property studied
    • G01N2203/0069Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0075Strain-stress relations or elastic constants
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02Details not specific for a particular testing method
    • G01N2203/06Indicating or recording means; Sensing means
    • G01N2203/067Parameter measured for estimating the property
    • G01N2203/0682Spatial dimension, e.g. length, area, angle

Abstract

The present invention provides a kind of side slope isolated coal pillar width based on coal sample creep test and determines method, comprising: samples of coal pulled simultaneously determines the primary excavation time;Time to rupture using the primary excavation time as coal sample on testing machine, it sets the normal stress of different stage and horizontal stress is set using Chen Shi hierarchical loading method, implement the creep rupture experiment within the primary excavation time to coal sample, creep stress-strain curve of coal sample and series of shear breakdown strength data under normal stresses at different levels are obtained, and record the object time intensity of coal sample;Object time intensity under normal stresses at different levels is fitted, the cohesive force and internal friction angle of coal sample are determined according to matched curve and moire intensity equation;Coal pillar width range is set, and according to identified coal sample cohesive force and internal friction angle data, the vertical stress field distribution rule and the plastic zone destruction area regularity of distribution of coal column under different coal pillar widths are simulated using FLAC3D software;Comparative analysis obtains suitable coal pillar width range.

Description

A kind of side slope isolated coal pillar width based on coal sample creep test determines method
Technical field
The invention belongs to coal mining technology fields, and in particular to a kind of side slope isolated coal pillar based on coal sample creep test Width determines method.
Background technique
China's opencut leaves lower a large amount of coal mine end sides, since exploiting field stripping-to-ore ratio is big or exploitation skill by exploiting for many years The limitation of art condition, this part pressure coal often have to be abandoned.Pressure coal is helped to be returned using high wall mining machine coal winning technology opposite end Receipts can reach good economic effect, improve coal recovery rate.Although high wall mining machine is widely used in foreign countries, But it is limited to technical equipment production level, the domestic use for seldom seeing high wall mining machine.Domestic scholars are end side machine in China A large amount of theoretical works have been done in popularization and use, have studied high wall mining machine in the application prospect and its applicable elements in China.Although such as This, research contents is foreign practical production experience and theoretical formula, and it is special that operational parameter is not necessarily applicable in China Geological Environment Engineering, also the isolated coal pillar width of side slope does not stay and sets carry out system research, and many problems still need to be practiced inspection It tests.
Summary of the invention
In view of the problems of the existing technology, it is wide to provide a kind of side slope isolated coal pillar based on coal sample creep test by the present invention Spend the method for determination.The technical solution of the present invention is as follows:
A kind of side slope isolated coal pillar width based on coal sample creep test determines method, comprising the following steps:
Step 1, samples of coal pulled, and determine that coalcutter completes the time of primary excavation in exploitation mining area;
Step 2, the time to rupture using the primary excavation time as coal sample on testing machine, and set the normal direction of different stage Stress and use Chen Shi hierarchical loading method set horizontal stress corresponding with normal stresses at different levels, are once returning to coal sample implementation The creep rupture experiment in the time is adopted, the creep stress-strain curve and series of shear for obtaining coal sample under normal stresses at different levels are broken Bad intensity data, and upper level horizontal stress when coal sample is destroyed is recorded as its object time intensity;
Step 3, the object time intensity under normal stresses at different levels is fitted, according to matched curve and moire intensity side Journey determines the cohesive force and internal friction angle of coal sample;
Step 4, coal pillar width range is set according to coalcutter back production parameter and mine geology condition, and according to identified Coal sample cohesive force and internal friction angle data simulate the vertical stress field distribution of coal column under different coal pillar widths using FLAC3D software Rule and the plastic zone destruction area regularity of distribution;
Step 5, by the comparative analysis to coal column vertical stress field distribution rule and the plastic zone destruction area regularity of distribution, Obtain suitable coal pillar width range.
In the above method, the moire intensity equation are as follows:τ=ctanφ, whereinτIndicate shear stress,cIndicate cohesion Power, σ indicate normal stress,φIndicate internal friction angle.
It is described that coal pillar width range is set according to coalcutter back production parameter and mine geology condition in the above method, wherein The coal pillar width range is in 2 ~ 6m.
The beneficial effects of the present invention are: the present invention is main according to coal column obtained based on coal sample creep test Mechanics parameter carries out numerical simulation using FLAC3D software side slope isolated coal pillar, proposes a whole set of and determines rationally isolation coal The method of column width, the application for coalcutter especially high wall mining machine in China are laid a good foundation.
Detailed description of the invention
Fig. 1 is wherein creep stress-strain curve of 3 parts of coal samples under 0.6MPa normal stress of the embodiment of the present invention 1 Figure.
Fig. 2 is wherein creep stress-strain curve of 3 parts of coal samples under 0.8MPa normal stress of the embodiment of the present invention 1 Figure.
Fig. 3 is wherein creep stress-strain curve of 3 parts of coal samples under 1.0MPa normal stress of the embodiment of the present invention 1 Figure.
Fig. 4 is the matched curve of coal sample object time intensity under different normal stresses of the embodiment of the present invention 1.
Fig. 5 is the vertical stress field distribution rule of 1 coal column of the embodiment of the present invention, wherein the wide 3m of (a) figure coal column, (b) figure coal The wide 4m of column, (c) the wide 5m of figure coal column.
Fig. 6 is the plastic zone destruction area regularity of distribution of 1 coal column of the embodiment of the present invention, wherein the wide 3m of (a) figure coal column, (b) figure The wide 4m of coal column, (c) the wide 5m of figure coal column.
Specific embodiment
The present invention is described in further details with specific embodiment with reference to the accompanying drawing, described is to solution of the invention It releases rather than limits.
Embodiment 1
The present invention provides a kind of side slope isolated coal pillar width based on coal sample creep test and determines method, in Inner Mongol coal Implement on the spot in field mining area, comprising the following steps:
Step 1, samples of coal pulled, and determining coalcutter is 3 days in the time that primary excavation is completed in exploitation mining area;
Step 2, coal sample is divided into 9 parts, using 3 days as every part coal sample of primary excavation time in the destruction on testing machine Between, and three-level normal stress: 0.6MPa, 0.8MPa, 1.0MPa is set, and using the setting of Chen Shi hierarchical loading method and normal direction at different levels The corresponding horizontal stress of stress is implemented the creep rupture within the primary excavation time to coal sample and is tested in 0.4 ~ 1.36MPa, Corresponding 3 parts of coal samples are tested in the creep rupture of every grade of normal stress, and the creep stress-strain for obtaining coal sample under normal stresses at different levels is bent Line (as shown in Fig. 1 ~ 3) and series of shear breakdown strength data, and the upper level level recorded when every part of coal sample is destroyed is answered Power;When direct stress be 0.6MPa when, wherein the object time intensity of 3 parts of coal sample test specimens be respectively 1.24MPa, 1.20MPa, 1.16MPa, when direct stress be 0.8MPa when, wherein the object time intensity of 3 parts of coal sample test specimens be respectively 1.32MPa, 1.28MPa, 1.20MPa, when direct stress is 1.0MPa, wherein the object time intensity of 3 parts of coal sample test specimens is respectively 1.32MPa, 1.36MPa, 1.28MPa are that coal sample exists after the object time intensity of coal sample is averaged under normal stresses at different levels Object time intensity under the normal stress, the corresponding coal sample object time intensity of 0.6MPa, 0.8MPa, 1.0MPa normal stress Respectively 1.186MPa, 1.266MPa, 1.320MPa;
Step 3, the object time intensity under normal stresses at different levels is fitted, matched curve is as shown in figure 4, according to quasi- Close curve and moire intensity equation:τ=ctanφ, whereinτIndicate shear stress,cIndicate that cohesive force, σ indicate normal stress,φIndicate internal friction angle, the cohesive force and internal friction angle for obtaining coal sample are respectively 1.0MPa and 18 °, according to building slope engineering skill The mechanics parameter of art specification, slope rock mass can be determined according to the mechanics parameter of sillar by the reduction of certain coefficient, when slope rock mass is complete Whole, the reduction coefficient of mechanics parameter takes 0.95 ~ 0.90, helps ROCK MASS JOINT, cranny development in conjunction with Inner Mongol coalfield mining area end Difference, Rock Mass Integrality is good, and reduction coefficient takes 0.95, the final cohesive force for determining isolated coal pillarc=0.95MPa, internal friction angleφ =17.1°;
Step 4, wide according to coalcutter back production parameter (the wide 2m high 2.5m in back production cavern) and mine geology condition setting coal column It is 3m, 4m and 5m that degree range, which is 3 ~ 5m(data point), and according to identified coal sample cohesive force and internal friction angle data, coal rock layer Basic mechanical parameter by table 1 be arranged, the vertical stress field distribution of coal column under different coal pillar widths is simulated using FLAC3D software Regular (as shown in Figure 5) and the plastic zone destruction area regularity of distribution (as shown in Figure 6);
The mechanics parameter of 1 coal rock layer of table
Step 5, to the comparative analysis result of coal column vertical stress field distribution rule and the plastic zone destruction area regularity of distribution It has been shown that, in the wide 3m of isolated coal pillar, concentrated stress suffered by the two sides and middle part of coal column is larger, and the whole plasticity that occurs of coal column is broken It is bad, support protective effect cannot be played to cavern;When wide 4m and 5m of isolated coal pillar, only coal column two sides occur stress concentrate it is existing As being still elastic region in the middle part of coal column;And only there is plastic failure area in the two sides smaller range of coal column;The stress of coal column State and plastic zone damage envelope are essentially identical, can guarantee that side machine in end carries out safety coal extraction work, but in view of improving coal Charcoal resource recovery, it is final to determine that isolated coal pillar width is 4m.

Claims (1)

1. a kind of side slope isolated coal pillar width based on coal sample creep test determines method, it is characterised in that the following steps are included:
Step 1, samples of coal pulled, and determine that coalcutter completes the time of primary excavation in exploitation mining area;
Step 2, the time to rupture using the primary excavation time as coal sample on testing machine, and set the normal stress of different stage Horizontal stress corresponding with normal stresses at different levels is set with using Chen Shi hierarchical loading method, coal sample is implemented in primary excavation Interior creep rupture experiment, the creep stress-strain curve and series of shear for obtaining coal sample under normal stresses at different levels destroy by force Degree evidence, and upper level horizontal stress when coal sample is destroyed is recorded as its object time intensity;
Step 3, the object time intensity under normal stresses at different levels is fitted, it is true according to matched curve and moire intensity equation Determine the cohesive force and internal friction angle of coal sample, the moire intensity equation are as follows:Wherein τ indicates shear stress, c table Show that cohesive force, σ indicate normal stress,Indicate internal friction angle;
Step 4, coal pillar width range is set according to coalcutter back production parameter and mine geology condition, and according to identified coal sample Cohesive force and internal friction angle data simulate the vertical stress field distribution rule of coal column under different coal pillar widths using FLAC3D software And the plastic zone destruction area regularity of distribution;
Step 5, it by the comparative analysis to coal column vertical stress field distribution rule and the plastic zone destruction area regularity of distribution, obtains Suitable coal pillar width range, the coal pillar width range is in 2~6m.
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Patentee before: LIAONING TECHNICAL University