CN203825944U - Gob-side entry retaining anchoring spoil wall bearing performance simulation tester - Google Patents

Abstract

The utility model discloses a gob-side entry retaining anchoring spoil wall bearing performance simulation tester. The tester comprises a U-shaped filling groove, a bearing board, an anchoring filler and a displacement measuring device. A laboratory loading control system is utilized to exert pressure onto a pressure transmission structure, in a compression process, a movement distance of the displacement measuring ruler and corresponding tester load values are recorded at each time interval, and axial displacement is recorded; stress values and strain values of the transverse anchoring filler at different time points in a loading process can be figured out according to the load values and axial and transverse displacements; a stress-strain relation curve of the transverse anchoring filler in the loading process is drafted, and bearing performance parameters of the transverse anchoring filler are determined. The tester solves problems of unicity, non-repeatability and on-site test environment complexity existing in a coal mine underground gob-side entry retaining spoil filling test and has great significance for application of the coal mine underground gob-side entry retaining transverse anchoring spoil wall technology.

Description

The simulating test device of gob-side entry retaining anchoring pack wall load-carrying properties

Technical field

The utility model relates to anchor structure load-carrying properties proving installation, relates in particular to the horizontal anchoring pack wall of gob-side entry retaining load-carrying properties simulating test device.

Background technology

Edge air gallery technology is the important technology developing direction of coal in China exploitation always.It to reducing tunnelling amount, improve coal recovery rate, reduce spoil discharge capacity, extend [underground, alleviate digging and take over contradiction and realize the exploitation of mine safety efficient green and have remarkable result.And in numerous edge air gallery technology research, waste filling edge air gallery technology is most widely used, under current technical merit, design and the roof condition that stays lane obturation depended in the success or failure of gob-side entry retaining to a great extent, if supporting design scheme can not obtain good Liu lane effect, not only can the huge manpower and materials of loss, but also threaten to the safety in production of mine.

The Dui Liu lane design of obtaining of the physical and mechanical parameters such as the intensity of gob-side entry retaining obturation, Poisson ratio, deformation modulus has direct directive function.Laterally anchoring pack wall is by anchor pole or anchor cable laterally being run through and be arranged in waste filling body, apply certain pretightning force, forming unified support system with supporting in the other auxiliary shoring in lane, lane.During gob-side entry retaining, the stress that laterally anchoring pack wall allows pressure effect, equilibrium activity carrying rock stratum strenuous exercise produce by booster action, transitional function, lower contracting, the stability of maintenance roadway surrounding rock.But in the practical application under coal mine, waste filling body is a kind of irreversible compression material, carrying time and effort consuming, cannot carry out too much down-hole on-the-spot test test; While is due to singularity and the complicacy of Working Environment of Underground Mine, also cannot carry out actual systematic analysis to the stressing conditions of anchor pole, steel band in obturation, add the on-the-spot practical operation problems such as roadway deformation is difficult to that control, filling process are synchronizeed with the quick propelling of workplace, make in-situ test be difficult to carry out under coal mine.

Therefore, simulation test is carried out in chamber by experiment, is the reliable way addressing the above problem.

Utility model content

The purpose of this utility model is to provide the simulating test device of the horizontal anchoring pack wall of a kind of gob-side entry retaining load-carrying properties, and by testing in laboratory simulation, the application that can be the horizontal anchoring pack wall of backfill for underground gob-side entry retaining of coal mine technology provides design guidance.

For solving the problems of the technologies described above, the technical scheme that the utility model anchor structure load-carrying properties simulating test device adopts is:

A kind of simulating test device of gob-side entry retaining anchoring pack wall load-carrying properties, it is characterized in that, it is comprised of filling groove, anchoring obturation, bearing plate and displacement measuring device, anchoring obturation is placed in filling groove, bearing plate is shelved in anchoring obturation after sinking to filling groove, displacement measuring device is movably arranged on filling groove and with anchoring obturation and is adjacent to, wherein:

Described filling groove is the U-shaped groove that the side steel plate by end steel plate and both sides forms, and side steel plate top tightens up with reinforcing steel band again, thereby forms the filling groove of a two sides sealing;

Described anchoring obturation consists of a plurality of filling bag, anchor pole and steel band; Filling bag is piled up in filling groove and is formed filled wall by the height of simulation obturation and width, the staggered stubble of pressing of levels while piling up, and longitudinal steel band and laterally steel band are close to the forward and backward facade of filled wall; Laterally the overlapping infall of steel band and longitudinal steel band is processed with through hole; Above-mentioned anchor pole in the past facade steel band through hole passes from rear facade steel band through hole through filling bag, and two ends are fixed with nut, thereby forms anchoring obturation; Above-mentioned anchor pole can be anchor cable;

Described bearing plate is the steel plate that a thickness is not less than 5mm, and bearing plate is pressed in obturation upper surface place;

Described displacement measuring device comprises longitudinal sleeve and the slide calliper rule support that is fixed on filling groove both sides, slide calliper rule support is a plane framework matching with filling slot length, plane framework is provided with slide calliper rule groove, the two ends of plane framework are provided with the longitudinal rod longitudinally stretching out, on longitudinal rod, be processed with screw thread, longitudinal rod is arranged on filling groove slide calliper rule support through longitudinal sleeve, and the stop nut of screwing on longitudinal rod, in slide calliper rule groove, level is inserted slide calliper rule, and after inserting, slide calliper rule should be close to filling bag.

The method of utilizing the utility model device to test anchor structure load-carrying properties is as follows:

The first step, makes simulating test device

The 1.1st step, makes anchoring obturation;

1.1.1 step, the particle of simulation obturation material is packed in cloth bag, and sealing forms filling bag, filling bag is piled up in filling groove by height and the width of simulation obturation, the staggered stubble of pressing of levels while piling up, the position of an inadequate whole bag, with half bag of filling, apertured place is tamped with obturation particle, make surfacing;

1.1.2 walks, and longitudinal steel band and horizontal steel band is close to the forward and backward facade of filled wall, after the through hole by anchor pole through the longitudinal steel band of front and back facade and horizontal steel band, with nut, tightens up, and filling bag is applied to certain pretightning force;

During skyhook, can install on filling limit, limit;

The 1.2nd step, lays bearing plate at obturation upper surface;

The 1.3rd step, installs displacement measuring device

The longitudinal rod of slide calliper rule support is passed to sleeve, thereby slide calliper rule support is arranged on filling groove, and the stop nut of screwing on longitudinal rod, in slide calliper rule groove, level is inserted slide calliper rule, and slide calliper rule and obturation are adjacent to;

Second step, is put into the good simulating test device of above-mentioned fabrication and installation on pressure test machine base, and starting pressure testing machine, when bearing plate just contacts with the power transmission pillar of pressure testing machine, is recorded the initial reading of slide calliper rule; Then start to load, in loading compression process, filled wall distortion, outwards passes slide calliper rule; At regular intervals now, record one time slide calliper rule displacement, and the axial deformation value of corresponding load value and filling bag;

The 3rd step, converses in loading procedure not obturation stress value σ and axial strain value ε in the same time by load value and shift value ₁with transverse strain value ε ₂;

EXPERIMENTAL STRAIN-STRESS CONVERSION formula is as follows:

$\mathrm{\σ}=\frac{p_i}{\mathrm{ab}}---\left(1\right)$

In formula:

The length of a-bearing plate and obturation surface of contact, mm;

B-bearing plate width, mm;

P _ithe load that-the i time testing machine applies, KN;

Axial strain reduction formula is as follows:

${\mathrm{\ϵ}}_1=\frac{u_i-u_0}{h}---\left(2\right)$

In formula:

U _i-the i time testing machine axial displacement value, mm;

U ₀the axial initial displacement value of-testing machine, mm;

Filled wall height before h-test, mm;

Transverse strain reduction formula is as follows:

${\mathrm{\ϵ}}_2=\frac{l_i-l_0}{d}---\left(3\right)$

In formula:

L _i-the i time slide calliper rule reading value, mm;

L ₀-slide calliper rule initial read numerical value, mm;

Filled wall width before d-test, mm;

According to (1), (2), (3) formula, calculate i obturation stress value σ and axial strain value ε ₁with transverse strain value ε ₂, and then i σ and ε ₁, ε ₂value is made the curves of stress-strain relationship of obturation in loading procedure, thereby calculates compressive strength, Poisson ratio and the deformation modulus equivalent-load performance parameter of horizontal anchoring pack wall.

The beneficial effects of the utility model:

1, the utility model can meet the laboratory tests such as load-carrying properties of the obturation height in various tunnels and width, anchor pole (rope) and the arrangement of steel band, different loading speed and load path, various obturation materials, and realized loading and distortion synchro measure, possess more than record data amount and precision advantages of higher simultaneously.

2, this method of testing is carried out in laboratory, avoided the impact that under coal mine, the nonrepeatability of in-situ test, unicity, limitation and on-the-spot sophisticated testing environment etc. bring, more can reflect accurately the mechanical characteristic of obturation, for the application of the horizontal anchoring pack wall of backfill for underground gob-side entry retaining of coal mine technology provides support and instructs.

3, apparatus structure of the present utility model compact, simple to operate, be easy to safeguard, use reliable, method of testing is simple and reliable, can realize multiple different horizontal anchoring pack wall simulation test scheme, and the precision of capable of regulating test, to meet the needs of different tunnel filling body load-carrying properties test, in the context of detection of the horizontal anchoring pack wall of coal mine gob-side entry retaining, there is practicality widely.

In a word, obturation-steel band-anchor pole of the present utility model (or anchor cable) is the gob-side entry retaining analog detection method of anchoring pack wall laterally, make obturation have enough can contracting amount, by suitable lower contracting, allow pressure, give full play to the load-bearing capacity of anchor pole, add obturation around steel band supporting and connection function, three forms an integral body, in gob-side entry retaining support system, complement each other, balance is complementary, Deformation control, within effective scope, is fully demonstrated to the stability action that obturation, anchor pole, steel band are safeguarded tunnel jointly.By this device, in laboratory, also can carry out under different work condition environments, the gob-side entry retaining simulation test of different charging formulas, anchor pole and the layout of steel band and diameter of anchor pole etc. of the material of while capable of regulating obturation and place mat height and width, correspondence, can, by adjusting loading speed, the load path of change testing machine to obturation of testing machine, realize the simulation test scheme under Different Strata stress and exploitation disturbed conditions; There is engineering simulation Test Application prospect widely.

Accompanying drawing explanation

Fig. 1 is structural perspective of the present utility model;

Fig. 2 is front view of the present utility model;

Fig. 3 is top plan view of the present utility model;

Fig. 4 is the partial enlarged drawing of slide calliper rule;

Fig. 5 is the I-I section structure schematic diagram of Fig. 1;

Fig. 6 is the partial enlarged drawing of Fig. 5;

Fig. 7 is curves of stress-strain relationship figure.

In figure: 1-side steel plate, 2-filling bag, the longitudinal sleeve of 3-, steel plate at the bottom of 4-, 5-anchor pole, the horizontal steel band of 6-, the longitudinal steel band of 7-, 8-reinforces steel band, 9-screw, 10-nut, 11-bearing plate, 12-slide calliper rule, 13-longitudinal rod, 14-slide calliper rule support, 15-slide calliper rule groove, 16-stop nut.

Embodiment

Below in conjunction with accompanying drawing, embodiment of the present utility model is described further.

As Fig. 1--the horizontal anchoring pack wall of the gob-side entry retaining as shown in the of 6 load-carrying properties simulating test device, by filling groove, anchoring obturation, bearing plate 11 and displacement measuring device, formed, anchoring obturation is placed in filling groove, bearing plate 11 is shelved in anchoring obturation after sinking to filling groove, displacement measuring device is movably arranged on filling groove and with anchoring obturation and is adjacent to, wherein:

Described filling groove is the U-shaped groove that the side steel plate 1 by end steel plate 4 and both sides forms, side steel plate 1 top tightens up with reinforcing steel band 8 again, as can be seen from Figure 1: reinforce steel band 8 and be fixed on side steel plate 1 by screw 9, thereby the filling groove that forms a two sides sealing, bearing plate 11 is pressed in obturation upper surface place; The side steel plate 1 of end steel plate 4 and both sides uses screw bolt and nut 10 to be fixed together by triangular steel.

Described anchoring obturation consists of a plurality of filling bag 2, anchor pole 5 and steel band; Filling bag 2 is piled up in filling groove and is formed filled wall by the height of simulation obturation and width, the staggered stubble of pressing of levels while piling up, and longitudinal steel band 7 and laterally steel band 6 are close to the forward and backward facade of filled wall; Laterally the overlapping infall of steel band 6 and longitudinal steel band 7 is processed with through hole; Above-mentioned anchor pole 5 in the past facade steel band through hole passes from rear facade steel band through hole through filling bag, and two ends are fixed with nut, thereby forms anchoring obturation; Above-mentioned anchor pole 5 can be anchor cable;

Above-mentioned horizontal steel band 6 is the steel band of length * wide=400mm * 40mm, and through-hole spacing is 100mm; Longitudinally steel band 7 is the steel band of length * wide=250mm * 40mm, and pitch of holes is 90mm, and longitudinally the distance of steel band 7 bottoms and filling trench bottom is greater than 50mm;

Described bearing plate 11 is steel plates that a thickness is not less than 5mm, and bearing plate 11 is pressed in anchoring obturation upper surface;

Described displacement measuring device comprises longitudinal sleeve 3 and the slide calliper rule support 14 that is fixed on filling groove both sides, slide calliper rule support 14 is plane frameworks that match with filling slot length, plane framework is provided with slide calliper rule groove 15, the two ends of plane framework are provided with the longitudinal rod 13 longitudinally stretching out, on longitudinal rod 13, be processed with screw thread, longitudinal rod 13 is arranged on filling groove slide calliper rule support 14 through longitudinal sleeve 3, and the stop nut 16 of screwing on longitudinal rod 13, in slide calliper rule groove 15, level is inserted slide calliper rule 12, and after inserting, slide calliper rule 12 should be close to filling bag 2.

The method of utilizing said apparatus to test anchor structure load-carrying properties is as follows:

The first step, makes simulating test device

The 1.1st step, makes anchoring obturation

1.1.1 step, the particle of simulation obturation material is packed in cloth bag, and sealing forms filling bag 2, filling bag 2 is piled up in filling groove by height and the width of simulation obturation, the staggered stubble of pressing of levels while piling up, the position of an inadequate whole bag, with half bag of filling, apertured place is tamped with obturation particle, make surfacing; The particle of above-mentioned simulation obturation material is the spoil piece that particle diameter is less than 5mm;

1.1.2 step, by horizontal steel band 6 and longitudinally steel band 7 be close to the front facade of filling bag 2 bodies of wall, by anchor pole 5 by through horizontal steel band 6 and longitudinally the through hole of steel band 7 from filling groove rear portion, pass, the anchor pole 5 two ends nut of screwing on, applies certain pretightning force to filling bag 2;

When skyhook 5 and laterally steel band 6, can install on filling limit, limit, paving one deck is filled out one deck, guarantees that every one deck filling bag 2 is flat; The staggered stubble of pressing while completing the 3rd layer and above filling bag 2, fill in time in free place; Be taped against longitudinal steel band 7 from the bottom up during several second through hole, put on the horizontal steel band 6 of anchor pole 5 and second, first-class nut, continues toward upper berth filling bag 2, until filling bag 2 is apart from filling groove top edge 1/4th places;

The 1.2nd step, lays bearing plate 11 at obturation upper surface;

The 1.3rd step, installs displacement measuring device

The longitudinal rod of slide calliper rule support 14 13 is passed to longitudinal sleeve 3, thereby slide calliper rule support 14 is arranged on filling groove, and the stop nut 16 of screwing on longitudinal rod 13, in slide calliper rule groove 15, level is inserted slide calliper rule 12, and slide calliper rule 12 and obturation are adjacent to;

Second step, is put into the good simulating test device of above-mentioned fabrication and installation on pressure test machine base, and starting pressure testing machine, when bearing plate 11 just contacts with the power transmission pillar of pressure testing machine, is recorded the initial reading of slide calliper rule 12; Then start to load, in loading compression process, filled wall distortion, outwards passes slide calliper rule 12; At regular intervals now, record slide calliper rule 12 displacements one time, and the axial deformation value of corresponding load value and filling bag;

For example, the bearing plate of simulating test device filling groove in certain ore deposit and the length a=500mm of obturation surface of contact; Bearing plate width b=300mm; Record data are i=9 time altogether; It is 1 listed that simulation test the results are shown in Table;

Table 1

Constantly	T0	T1	T2	T3	T4	T5	T6	T7	T8	T9
											Load/KN	0	7.2	13.1	20.1	29.2	41.6	54.4	66.1	81.4	97.8
Axial deformation/mm	0	4.5	9	13.5	18	22.5	27	31.5	36	40.5
											Transversely deforming/mm	0	0.1	0.6	1.4	2.8	4.6	7.0	10.2	15.6	29.6

The 3rd step, converses in loading procedure not obturation stress value σ and axial strain value ε in the same time by load value and shift value ₁with transverse strain value ε ₂;

EXPERIMENTAL STRAIN-STRESS CONVERSION formula is as follows:

$\mathrm{\σ}=\frac{p_i}{\mathrm{ab}}---\left(1\right)$

In formula:

The length of a-bearing plate and obturation surface of contact, mm;

B-bearing plate width, mm;

P _ithe load that-the i time testing machine applies, KN;

Axial strain reduction formula is as follows:

${\mathrm{\ϵ}}_1=\frac{u_i-u_0}{h}---\left(2\right)$

In formula:

U _i-the i time testing machine axial displacement value, mm;

U ₀the axial initial displacement value of-testing machine, mm;

Filled wall height before h-test, mm;

Transverse strain reduction formula is as follows:

${\mathrm{\ϵ}}_2=\frac{l_i-l_0}{d}---\left(3\right)$

In formula:

L _i-the i time slide calliper rule reading value, mm;

L ₀-slide calliper rule initial read numerical value, mm;

Filled wall width before d-test, mm;

By table 1 load value, shift value substitution (1), (2), (3) formula, converse obturation stress value σ and the axial strain value ε of 9 records in loading procedure ₁with transverse strain value ε ₂, as listed in table 2:

Table 2

Constantly	T0	T1	T2	T3	T4	T5	T6	T7	T8	T9
											Stress/MPa	0	0.05	0.09	0.13	0.20	0.28	0.36	0.44	0.54	0.65
Axial strain/%	0	1.5	3	4.5	6	7.5	9	10.5	12	13.5
											Transverse strain/%	0	0.04	0.21	0.47	0.92	1.50	2.32	3.39	5.22	9.86

Then according to above-mentioned σ and ε ₁, ε ₂value is made the curves of stress-strain relationship (seeing Fig. 7) of obturation in loading procedure, thereby calculates compressive strength, Poisson ratio and the deformation modulus equivalent-load performance parameter of horizontal anchoring pack wall.

Claims (2)

1. the simulating test device of gob-side entry retaining anchoring pack wall load-carrying properties, it is characterized in that, it is comprised of filling groove, anchoring obturation, bearing plate and displacement measuring device, anchoring obturation is placed in filling groove, bearing plate is shelved in anchoring obturation after sinking to filling groove, displacement measuring device is movably arranged on filling groove and with anchoring obturation and is adjacent to, wherein:

Described filling groove is the U-shaped groove that the side steel plate by end steel plate and both sides forms, and side steel plate top tightens up with reinforcing steel band again, thereby forms the filling groove of a two sides sealing;

Described anchoring obturation consists of a plurality of filling bag, anchor pole and steel band; Filling bag is piled up in filling groove and is formed filled wall by the height of simulation obturation and width, the staggered stubble of pressing of levels while piling up, and longitudinal steel band and laterally steel band are close to the forward and backward facade of filled wall; Laterally the overlapping infall of steel band and longitudinal steel band is processed with through hole; Above-mentioned anchor pole in the past facade steel band through hole passes from rear facade steel band through hole through filling bag, and two ends are fixed with nut, thereby forms anchoring obturation;

Described bearing plate is the steel plate that a thickness is not less than 5mm, and bearing plate is pressed in obturation upper surface place;

Described displacement measuring device comprises longitudinal sleeve and the slide calliper rule support that is fixed on filling groove both sides, slide calliper rule support is a plane framework matching with filling slot length, plane framework is provided with slide calliper rule groove, the two ends of plane framework are provided with the longitudinal rod longitudinally stretching out, on longitudinal rod, be processed with screw thread, longitudinal rod is arranged on filling groove slide calliper rule support through longitudinal sleeve, and the stop nut of screwing on longitudinal rod, in slide calliper rule groove, level is inserted slide calliper rule, and after inserting, slide calliper rule should be close to filling bag.

2. the simulating test device of gob-side entry retaining anchoring pack wall load-carrying properties as claimed in claim 1, is characterized in that, described anchor pole substitutes with anchor cable.