CN103115821A - In-situ test system and method of lane filler bearing property - Google Patents

In-situ test system and method of lane filler bearing property Download PDF

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Publication number
CN103115821A
CN103115821A CN2013100165156A CN201310016515A CN103115821A CN 103115821 A CN103115821 A CN 103115821A CN 2013100165156 A CN2013100165156 A CN 2013100165156A CN 201310016515 A CN201310016515 A CN 201310016515A CN 103115821 A CN103115821 A CN 103115821A
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obturation
pressure
bearing plate
hydraulic prop
value
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CN103115821B (en
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赵同彬
刘长雷
谭云亮
马成甫
刘鹏程
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Shandong University of Science and Technology
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Abstract

The invention discloses an in-situ test system and method of lane filler bearing property. The in-situ test system comprises a loading control system, a pressure support system and a displacement measurement system, wherein the loading control system applies a pressure to the pressure support system; in a pressure-applying process, a vernier caliper of the displacement measurement system records a corresponding pressure value of a pressure meter when moving for a certain distance; stress values and strain values of a filler in different moments in a loading process are converted through the pressure value and the displacement value; and a stress-strain relation curve of the filler in the loading process is made according to the stress values and the strain values so as to determine bearing performance parameters such as compressive strength and deformation modulus of the lane filler. According to the in-situ test system and method, the influences caused by the size effect and a test environment and the like during testing in a laboratory are fundamentally eliminated, and the engineering mechanics properties of the filler can be actually reflected.

Description

In-situ test system and the method for testing thereof of lane side obturation load-carrying properties
Technical field
The present invention relates to a kind of measuring technology of engineering Rock And Soil load-carrying properties, especially the in-situ testing technique of obturation load-carrying properties is helped in the lane.
Background technology
Edge air gallery technology is the important technology developing direction of coal in China exploitation always, and it is taken over contradiction and realize that the mine safety high-efficiency mining has remarkable result raising coal recovery rate, reduction tunnelling rate, alleviation digging.In recent years, along with all the more attention of country to mine environment, Green Technique in Coal Mining has obtained wideling popularize, and edge air gallery technology also generally begins to adopt the lane to help filling method to protect the lane, compaction material commonly used mainly comprises at present: concrete, work stone, spoil, lotion, Gao Shui etc., the physical and mechanical property of these materials and the effect of gob-side entry retaining are closely related.
Obtaining staying the lane design to have direct directive function of the physical and mechanical parameters such as the intensity of lane side obturation, deformation modulus, but the test of present obturation load-carrying properties all is confined to carry out in the laboratory, normally is made into the small scale test specimen and completes test on pressure testing machine.The inevitable like this problem of bringing two aspects: the sample dimensions of making in (1) laboratory is compared with the scene, not only yardstick is less than normal in the plane, and different arranged highly also, also be difficult to consider the contact situation between compaction material, the result of test can not accurately reflect the true load-carrying properties of on-the-spot filled wall like this; (2) on-the-spot inter-road side obturation is piled up on roadway floor, is by " obturation-base plate " system shared to the support action of top board, and is difficult to realize the test of this system in the laboratory.
Therefore, carry out situ downhole test and be a kind of accurately, the effective ways of quick obtaining gob-side entry retaining obturation load-carrying properties, the method not yet has the pertinent literature report so far.
Summary of the invention
The object of the present invention is to provide a kind of in-situ test system of backfill for underground gob-side entry retaining of coal mine obturation load-carrying properties.
The present invention provides the method for utilizing this test macro that down-hole gob-side entry retaining obturation load-carrying properties are tested simultaneously.
For solving the problems of the technologies described above, the technical scheme that test macro of the present invention adopts is:
The in-situ test system of obturation load-carrying properties is helped in a kind of lane, it is characterized in that, it is comprised of Loading Control System, pressure support system and displacement measurement system, wherein:
Described loading system is to be connected to form by emulsion power pack, Loading Control case and hydraulic prop; The Loading Control case be one with the pressure-oil tank of inlet and liquid outlet; Inlet is connected by liquid flowing valve and emulsion power pack, and the pressure duct of liquid outlet and hydraulic prop is connected; Connect a pressure gauge that reflects the hydraulic prop anchorage force on pressure-oil tank;
Described pressure support system comprises back timber and bearing plate; Require the thickness of bearing plate to be not less than 20mm, the length of bearing plate has needling greater than the length of obturation upper surface at bearing plate upper surface uniform welding;
Described displacement measurement system is made of cushion block, the base and the electronic cursor slide calliper rule that are placed on cushion block successively; Base is one and is with reeded square wooden unit; The electronic cursor slide calliper rule vertically are inserted in base groove.
In order to make test result more accurate, the preferred 6-9 root of described hydraulic prop, at this moment, the liquid outlet of pressure-oil tank also should be 6-9 mutually.
The method of testing of test macro of the present invention is:
Comprise the following steps:
The first step: the tunnel of cleaning lane side filling, pile up according to a conventional method obturation, filling be stacked to from back be enough to lay the height of hydraulic prop the time, lay bearing plate at the obturation upper surface; Bearing plate is in cantilever position after stretching out the obturation side direction;
Second step: arrange successively cushion block on the roadway floor below cantilever and be with reeded base; The electronic cursor slide calliper rule vertically are inserted in base groove, make the outer measuring jaw of movement of electronic cursor slide calliper rule withstand on bearing plate cantilever place;
The 3rd step: hydraulic prop is placed in needling on bearing plate, after hydraulic prop is vertically ajusted, is laying back timber between hydraulic prop and back; Simultaneously emulsion power pack, Loading Control case, hydraulic prop three are connected by pressure duct;
The 4th step: open the liquid flowing valve on the Loading Control case, the single hydraulic prop back timber is slowly risen, when back timber just contacted with back, valve-off was recorded the initial reading of electronic cursor slide calliper rule; Then reopen the valve on the Loading Control case, hydraulic prop is exerted pressure to obturation by bearing plate, in course of exerting pressure, the distance that the every movement of vernier caliper is certain records corresponding tensimeter force value;
Converse in loading procedure not in the same time obturation stress value σ and strain value ε by force value and movement value;
The EXPERIMENTAL STRAIN-STRESS CONVERSION formula is as follows:
σ = nπD 2 4 ab · p i - - - ( 1 )
In formula:
N-hydraulic prop quantity;
A D-column internal diameter, mm;
The length of a-bearing plate and obturation surface of contact, mm;
B-bearing plate width, mm;
p i-the i time manometric reading value, MPa;
The strain reduction formula is as follows:
ϵ = l i - l 0 h - - - ( 2 )
In formula:
l 0-electronic cursor slide calliper rule initial reading, mm;
l iThe reading value of-the i time electronic cursor slide calliper rule, mm;
Filled wall height before h-test, mm;
Calculate according to (1), (2) formula and can obtain i σ and ε value, and then i σ and ε value are made the curves of stress-strain relationship of obturation in loading procedure, thereby determine compressive strength and deformation modulus equivalent-load performance parameter that obturation is helped in the lane.
Beneficial effect of the present invention:
1, the present invention adopts hydraulic prop commonly used in coal production as the main body of loading system, design by Loading Control case and bearing plate, can satisfy the in-situ test that the load-carrying properties of obturation width, different obturation materials are helped in different lanes, and realized loading and the distortion simultaneous observation, possessed simultaneously that whole process is once tested, the record data amount reaches the precision advantages of higher more.This method of testing is carried out at the down-hole engineering site, fundamentally eliminates the impact that size effect in the build-in test of existing laboratory, experimental enviroment etc. bring, and more can reflect really the engineering mechanical properties of obturation.
2, simple in structure, the easy accessibility of the present invention, flexibly mobile, can provide imposed load in a big way, and capable of regulating test macro range and precision, to satisfy the needs of different lanes sides obturation load-carrying properties test.
Description of drawings
Fig. 1 is the schematic diagram of the embodiment of the present invention; In figure take six roots of sensation hydraulic prop as example.
Fig. 2 is the planimetric map of bearing plate;
Fig. 3 is the front view sectional view of base;
Fig. 4 is that flow diagram is calculated in stress of the present invention, strain;
Fig. 5 is σ and the ε relation curve that embodiment tests acquisition.
In figure, 1-emulsion power pack, 2-hydraulic prop, 3-Loading Control case, 4-high-pressure oil pipe, 5-valve, 6-pressure gauge, 7-roof master, 8-bearing plate, 9-needling, 10-electronic cursor slide calliper rule, 11-base, 12-cushion block, 13-obturation.
Embodiment
With reference to the accompanying drawings, the embodiment of the present invention is further illustrated.
As can be seen from Figure 1, the embodiment of in-situ test system of the present invention is comprised of Loading Control System, pressure support system and displacement measurement system, wherein:
Described loading system is to be connected to form by emulsion power pack 1, Loading Control case 3 and six roots of sensation hydraulic prop 2; Loading Control case 3 be one with the pressure-oil tank of an inlet and a plurality of liquid outlets; Inlet is connected by liquid flowing valve 5 and emulsion power pack 1, and each liquid outlet is connected by high-pressure oil pipe 4 and corresponding hydraulic prop 2; Connect a pressure gauge 6 that reflects hydraulic prop 2 anchorage forces on pressure-oil tank;
Described pressure support system comprises back timber 7 and bearing plate 8; Require the thickness of bearing plate 8 to be not less than 20mm, the length of bearing plate 8 has needling 9(to see Fig. 2 greater than the length of obturation 13 upper surfaces at bearing plate 8 upper surface uniform weldings);
Described displacement measurement system is made of cushion block 12, the base 11 and the electronic cursor slide calliper rule 10 that are placed on cushion block 12 successively; Base 11 is one and is with reeded square wooden unit; Electronic cursor slide calliper rule 10 vertically are inserted in (see figure 3) in base groove.
The method of utilizing system of the present invention to help the obturation load-carrying properties to test to the lane:
The first step: make a bearing plate 8 as shown in Figure 2, bearing plate 8 is the square plate of a length 1.5m * width 1.0m * thickness 20mm, and the top uniform welding of square plate has needling 9;
Second step: clear up in test site the tunnel that filling is helped in the lane, pile up according to a conventional method obturation 13, obturation 13 adopts the spoil bags to pile up the body of wall of formation, and body of wall height 1.0m, width 1.0m, length 1.2m lay bearing plate 8 at obturation 13 upper surfaces; Bearing plate 8 is in cantilever position after stretching out obturation 13; The needling 9 of bearing plate 8 up;
The 3rd step: arrange cushion block 12 on the roadway floor below cantilever and be with reeded base 11(to see Fig. 3); Electronic cursor slide calliper rule 10 vertically are inserted in base 11 grooves, make the outer measuring jaw of movement of electronic cursor card 10 withstand on bearing plate 8 cantilever places;
Six roots of sensation hydraulic prop 2 is placed in needling 9 on bearing plate 8, after hydraulic prop 2 is vertically ajusted, is laying roof master 7 between hydraulic prop 2 and back; Simultaneously emulsion power pack 1, Loading Control case 3, hydraulic prop 2 threes are connected by high-pressure oil pipe 4;
The 4th step: open the liquid flowing valve 5 on Loading Control case 3, hydraulic prop 2 holder roof masters 7 are slowly risen, when roof master 7 just contacts with back, close liquid flowing valve 5, record the initial reading of electronic cursor slide calliper rule 10, for example initial reading is 0.62mm; Then reopen the liquid flowing valve 5 on the Loading Control case, hydraulic prop 2 is exerted pressure to obturation 13 by bearing plate 8, " in course of exerting pressure, in order to record conveniently, the every mobile 2cm of vernier caliper 10 records corresponding pressure gauge 6 force value; It is 1 listed that test result sees Table;
Table 1 tensimeter and slide calliper rule read-record table
Constantly T0 T1 T2 T3 T4 T5 T6 T7 T8 T9
Tensimeter/MPa 0 1.83 4.39 7.68 11.70 17.55 23.40 31.08 21.40 15.80
Slide calliper rule/mm 0.62 20.62 40.62 60.62 80.62 100.62 120.62 140.62 160.62 180.62
Converse in loading procedure not in the same time obturation stress and strain by table 1 force value;
Stress formula is as follows: σ = nπD 2 4 ab · p i
In formula:
N-hydraulic prop quantity is got the six roots of sensation;
A D-column internal diameter is got 100mm;
The length of a-bearing plate and obturation surface of contact is got 1.2m;
B-bearing plate width, 1.0m;
p i-the i time manometric reading value;
The strain reduction formula is as follows:
In formula:
l 0-electronic cursor slide calliper rule initial reading is got 0.62mm;
l iThe reading value of-the i time electronic cursor slide calliper rule, the mm of unit;
Filled wall height before h-test is got 1000mm.
Can obtain the stress and strain value that is not applied in the same time on filled wall as shown in table 2 according to calculating;
Table 2 filled wall ess-strain record sheet
Constantly T0 T1 T2 T3 T4 T5 T6 T7 T8T9
Stress/MPa 0 0.07 0.17 0.30 0.46 0.69 0.92 1.22 0.840.62
Strain/% 0 2 4 6 8 10 12 14 1618
Make the curves of stress-strain relationship (see figure 4) of obturation in loading procedure according to table 2, thereby determine compressive strength and deformation modulus equivalent-load performance parameter that obturation is helped in the lane, said process as shown in Figure 5.

Claims (3)

1. the in-situ test system of lane side obturation load-carrying properties, is characterized in that, it is comprised of Loading Control System, pressure support system and displacement measurement system, wherein:
Described loading system is to be connected to form by emulsion power pack, Loading Control case and hydraulic prop; The Loading Control case be one with the pressure-oil tank of inlet and liquid outlet; Inlet is connected by liquid flowing valve and emulsion power pack, and the pressure duct of liquid outlet and hydraulic prop is connected; Connect a pressure gauge that reflects the hydraulic prop anchorage force on pressure-oil tank;
Described pressure support system comprises back timber and bearing plate; Require the thickness of bearing plate to be not less than 20mm, the length of bearing plate has needling greater than the length of obturation upper surface at bearing plate upper surface uniform welding;
Described displacement measurement system is made of cushion block, the base and the electronic cursor slide calliper rule that are placed on cushion block successively; Base is one and is with reeded square wooden unit; The electronic cursor slide calliper rule vertically are inserted in base groove.
2. in-situ test system as claimed in claim 1, is characterized in that, described hydraulic prop is the 6-9 root, and the liquid outlet of pressure-oil tank also should be 6-9 mutually.
3. the method for testing of in-situ test system as claimed in claim 1 or 2, is characterized in that, comprises the following steps:
The first step: the tunnel of cleaning lane side filling, pile up according to a conventional method obturation, filling be stacked to from back be enough to lay the height of hydraulic prop the time, lay bearing plate at the obturation upper surface; Bearing plate is in cantilever position after stretching out the obturation side direction;
Second step: arrange successively cushion block on the roadway floor below cantilever and be with reeded base; The electronic cursor slide calliper rule vertically are inserted in base groove, make the outer measuring jaw of movement of electronic cursor slide calliper rule withstand on bearing plate cantilever place;
The 3rd step: hydraulic prop is placed in needling on bearing plate, after hydraulic prop is vertically ajusted, is laying back timber between hydraulic prop and back; Simultaneously emulsion power pack, Loading Control case, hydraulic prop three are connected by pressure duct;
The 4th step: open the liquid flowing valve on the Loading Control case, the single hydraulic prop back timber is slowly risen, when back timber just contacted with back, valve-off was recorded the initial reading of electronic cursor slide calliper rule; Then reopen the valve on the Loading Control case, hydraulic prop is exerted pressure to obturation by bearing plate, in course of exerting pressure, the distance that the every movement of vernier caliper is certain records corresponding tensimeter force value;
Converse in loading procedure not in the same time obturation stress value σ and strain value ε by force value and movement value;
The EXPERIMENTAL STRAIN-STRESS CONVERSION formula is as follows:
σ = nπD 2 4 ab · p i - - - ( 1 )
In formula:
N-hydraulic prop quantity;
A D-column internal diameter, mm;
The length of a-bearing plate and obturation surface of contact, mm;
B-bearing plate width, mm;
p i-the i time manometric reading value, MPa;
The strain reduction formula is as follows:
ϵ = l i - l 0 h - - - ( 2 )
In formula:
l 0-electronic cursor slide calliper rule initial reading, mm;
l iThe reading value of-the i time electronic cursor slide calliper rule, mm;
Filled wall height before h-test, mm;
Calculate i σ and ε value according to (1), (2) formula, and then i σ and ε value are made the curves of stress-strain relationship of obturation in loading procedure, thereby determine compressive strength and the deformation modulus equivalent-load performance parameter that obturation is helped in the lane.
CN201310016515.6A 2013-01-16 2013-01-16 The in-situ test system of lane side obturation load-carrying properties and method of testing thereof Active CN103115821B (en)

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Cited By (7)

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Publication number Priority date Publication date Assignee Title
CN104390861A (en) * 2014-11-24 2015-03-04 山东科技大学 Experimental device and testing method for testing stability of gob-side entry retaining
CN105738208A (en) * 2016-04-25 2016-07-06 东北大学 Device and method for testing mechanical property of rock test sample under passive restraint of gravel
CN105910916A (en) * 2016-05-18 2016-08-31 华北科技学院 Gob-side entry-retaining roadside filling effect detection experiment device
CN106353199A (en) * 2016-10-20 2017-01-25 山东科技大学 Method for field real-time monitoring of creep type rock burst risk
CN108661718A (en) * 2018-05-11 2018-10-16 长春黄金研究院有限公司 A kind of device and method for mine down-hole stope filling barricade forces testing
RU2806841C1 (en) * 2023-04-11 2023-11-08 Федеральное государственное бюджетное учреждение высшего образования "Петрозаводский государственный университет" Training and laboratory complex with remote control for studying stress-strain state of metal framework
CN117491174A (en) * 2023-12-28 2024-02-02 山东黄金矿业科技有限公司充填工程实验室分公司 Mining filling material performance detection device

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104390861A (en) * 2014-11-24 2015-03-04 山东科技大学 Experimental device and testing method for testing stability of gob-side entry retaining
CN105738208A (en) * 2016-04-25 2016-07-06 东北大学 Device and method for testing mechanical property of rock test sample under passive restraint of gravel
CN105910916A (en) * 2016-05-18 2016-08-31 华北科技学院 Gob-side entry-retaining roadside filling effect detection experiment device
CN105910916B (en) * 2016-05-18 2018-08-14 华北科技学院 Gob side entry retaining roadside packing effect detection experimental provision
CN106353199A (en) * 2016-10-20 2017-01-25 山东科技大学 Method for field real-time monitoring of creep type rock burst risk
CN108661718A (en) * 2018-05-11 2018-10-16 长春黄金研究院有限公司 A kind of device and method for mine down-hole stope filling barricade forces testing
RU2806841C1 (en) * 2023-04-11 2023-11-08 Федеральное государственное бюджетное учреждение высшего образования "Петрозаводский государственный университет" Training and laboratory complex with remote control for studying stress-strain state of metal framework
CN117491174A (en) * 2023-12-28 2024-02-02 山东黄金矿业科技有限公司充填工程实验室分公司 Mining filling material performance detection device
CN117491174B (en) * 2023-12-28 2024-03-08 山东黄金矿业科技有限公司充填工程实验室分公司 Mining filling material performance detection device

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