CN104833575B - A kind of geosynthetics anisotropy pull-out test system and method - Google Patents
A kind of geosynthetics anisotropy pull-out test system and method Download PDFInfo
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Abstract
A kind of geosynthetics anisotropy pull-out test system and method, this system includes test-bed, lower test box, upper test box, drawing charger, guide rail, graduated disc, vertical loading device, displacement transducer, signal acquisition and control device and for clamping the fixture of geosynthetics sample；The upper surface of test-bed is provided with the graduated disc of circle, guide rail and lower test box；Drawing charger is arranged on guide rail and freely slides on guide rail；Drawing charger is provided with the displacement transducer for measured material displacement；Vertical loading device, upper test box, geosynthetics sample and lower test box are successively set on test-bed from top to bottom；Signal acquisition and control device is connected with drawing charger, displacement transducer and vertical loading device respectively。Present invention effectively prevents geosynthetics pull-out test test value and engineering actual loading characteristic grave fault and the advantage with test process controllable precise。
Description
Technical field
The invention belongs to geosynthetics mechanical property test field tests, relate to a kind of geosynthetics anisotropy pull-out test system and method, particularly relate to geosynthetics anisotropy pull-out test system and the implementation thereof of a kind of Loess Gullys reinforced earth technology。
Background technology
Geosynthetics is for raw material, to make various types of product with the polymer (such as plastics, chemical fibre, synthetic rubber etc.) of synthetic, is placed between inside soil body, surface or the various soil body, plays and strengthens or the effect of the protection soil body。Mainly include the types such as geotextile, GSZ, geomembrane, geotechnique's special material and earthwork composite material, glass fiber net, geotechnique's pad。
At present, " geosynthetics test procedure " (SL235-2012) and " highway engineering geosynthetics testing regulations " (JTGE50-2006) all refer to geosynthetics pull-out test。But, current geosynthetics pull-out test process still suffering from problems: during the sampling of (1) geosynthetics, sample pull-out test direction is random big, and the mechanical property that test obtains is not necessarily representative；(2), during geosynthetics sampling, only define geosynthetics sampling scope and sampling size at present, and would be likely to occur discordance between taken each sample；(3) during geosynthetics pull-out test, normally only do the test in (or two) direction, cannot considering the anisotropy of geosynthetics, the geosynthetics mechanical performance index that pull-out test draws can not reflect the actual mechanical property of geosynthetics in engineering reality really。
In sum, owing to there is the problems such as such as sampling, test method in existing geosynthetics pull-out test process, the geosynthetics mechanical performance index that its test obtains can not reflect the actual mechanical property of geosynthetics in engineering reality really。In fact, the actual mechanical property that the geosynthetics mechanical performance index that obtains of test is often better than in engineering reality geosynthetics, when adopting the geosynthetics mechanical performance index that existing geosynthetics pull-out test obtains to carry out engineering design, there is bigger hidden danger in its security performance, construction quality and people life property safety in serious threat。
Summary of the invention
It is an object of the invention to solve prior art is tested the technical problem that the geosynthetics mechanical performance index obtained cannot truly reflect that engineering is actual, so provide a kind of taken into full account geosynthetics mechanical property anisotropy, effectively prevent the geosynthetics anisotropy pull-out test system and method for experimental test value and geosynthetics actual loading characteristic grave fault and test process controllable precise in current specifications。
To achieve these goals, the present invention adopts the following technical scheme that
A kind of geosynthetics anisotropy pull-out test system, it is characterised in that: described geosynthetics anisotropy pull-out test system includes test-bed, lower test box, upper test box, drawing charger, guide rail, graduated disc, vertical loading device, displacement transducer, signal acquisition and control device and for clamping the fixture of the geosynthetics sample of pending pull-out test；The upper surface of described test-bed is provided with the graduated disc of circle, guide rail and lower test box；Described guide rail and graduated disc are arranged concentrically；Described drawing charger is arranged on guide rail and freely slides on guide rail；Described drawing charger is provided with the displacement transducer for measured material displacement；Described vertical loading device, upper test box, the geosynthetics sample of pending pull-out test and lower test box are successively set on from top to bottom on test-bed and are in the circle centre position of guide rail and graduated disc；Described signal acquisition and control device is connected with drawing charger, displacement transducer and vertical loading device respectively。
As preferably, geosynthetics anisotropy pull-out test system provided by the present invention also includes hold-down support, reaction frame and the counter-force bar being connected with reaction frame；Described vertical loading device is arranged on reaction frame；Described upper test box is connected with counter-force bar by hold-down support。
As preferably, guide rail of the present invention being provided with limited impression and the advance ball being placed in limited impression；Described drawing charger is connected with guide rail by advance ball and is freely slided on guide rail。
As preferably, geosynthetics anisotropy pull-out test system provided by the present invention also includes the loading plate being arranged between vertical loading device and upper test box；Described vertical loading device applies vertical load by loading plate upwards test box。
As preferably, the diameter of loading plate of the present invention is not less than the difference of the internal diameter of 190mm, the diameter of described loading plate and upper test box within the scope of 5～10mm。
As preferably, lower test box of the present invention is semi-enclosed hollow cylinder；The internal diameter of described lower test box is not less than 300mm, and the thickness of described lower test box is not less than 5mm, is highly not less than 50mm；Described upper test box is the regular polygon cylinder containing inscribed circle；The internal diameter of described upper test box is not less than 200mm, and the most weakness thickness of the wall thickness of described upper test box is not less than 3mm, and the height of described upper test box is not less than 100mm, and the difference of the external diameter of described upper test box and lower test box internal diameter is not less than 80mm。
As preferably, regular polygon cylinder of the present invention is regular pentagon cylinder, regular hexagon cylinder, positive heptagon cylinder or octagon cylinder。
As preferably, the width of the geosynthetics sample of the pending pull-out test of holder of the present invention is not less than 200mm。
As preferably, the drawing speed of drawing charger of the present invention is between 0.05mm/min to 50mm/min。
A kind of implementation that based on foregoing geosynthetics anisotropy pull-out test system, geosynthetics is carried out anisotropy pull-out test, it is characterised in that: said method comprising the steps of:
1) the geosynthetics sample of pending pull-out test is cut, the circular in cross-section of the geosynthetics sample of described pending pull-out test, the diameter of the geosynthetics sample of described pending pull-out test is identical with the external diameter of the lower test box of geosynthetics anisotropy pull-out test system；
2) the upper test box of geosynthetics anisotropy pull-out test system and lower test box are unloaded, filling test soil sample, test soil sample compactness in upper test box and in lower test box actual compactness on-the-spot with engineer applied is consistent, in described lower test box, the height of filling test soil sample is identical with the box height of lower test box, and in described upper test box, the height of filling test soil sample is not less than 50mm；
3) being layed on the upper surface of the test soil sample within lower test box by the geosynthetics sample of pending pull-out test, the geosynthetics sample of pending pull-out test keeps smooth, unfolded and corrugationless；
4) lower test box is mounted on test-bed, is located the geosynthetics sample position of pending pull-out test by scale markings 0 °；
5) install test box, regulate hold-down support, by the horizontal displacement of the upper test box of hold-down support constraint；
6) regulate vertical loading device, loading plate is applied vertical load, make loading plate contact well with test soil sample surface；
7) regulating drawing charger, the geosynthetics sample of the pending pull-out test of holder on drawing charger, gripping width is not less than 200mm；
8) apply 25kPa vertical load by vertical loading device, load consolidation time and be not less than 20min；Load after consolidation completes and apply 0.05-0.1kPa horizontal loading by drawing charger, make the geosynthetics sample stress everywhere of drawing charger and pending pull-out test tighten, displacement transducer reading is adjusted to zero；
9) apply horizontal loading by drawing charger, start drawing, survey and read and record displacement and horizontal pull；Drawing speed presses strain controlling loading, and drawing speed is between 0.05mm/min to 50mm/min；
10) when drawing charger apply horizontal loading occur peak value or test carry out to horizontal loading be stationary value time, test completes；
11) the geosynthetics sample of different pending pull-out tests is selected, repeat step 2)～step 10), in enforcement step 4) time, according to being marked, the geosynthetics sample of pending pull-out test is placed on lower test box same position place, apply each geosynthetics sample testing one piece of pending pull-out test under the vertical pressure of 50kPa, 100kPa, 200kPa and 400kPa respectively through vertical loading device, namely complete geosynthetics sample pull-out test under different vertical pressures when 0 ° of pending pull-out test；
12) the geosynthetics sample of different pending pull-out tests is selected, repeat step 2)～step 11), in enforcement step 4) time, according to being marked, the geosynthetics sample of pending pull-out test is placed on lower test box same position place, by guide rail, drawing charger is extremely rotated to 22.5 ° simultaneously, respectively at 25kPa, 50kPa, 100kPa, each geosynthetics sample testing one piece of pending pull-out test under 200kPa and 400kPa vertical pressure, namely geosynthetics sample pull-out test under different vertical pressures when 22.5 ° of pending pull-out test is completed；
13) the geosynthetics sample judging pending pull-out test is 90 ° of symmetries or 45 ° of symmetries；If 90 ° of symmetries, repeat step 12), simultaneously in enforcement step 4) time, by guide rail, drawing charger is rotated respectively to 45 °, 67.5 ° and 90 °, namely complete the geosynthetics sample pull-out test under 25kPa, 50kPa, 100kPa, 200kPa and 400kPa vertical pressure when 45 °, 67.5 ° and 90 ° respectively of pending pull-out test；If 45 ° of symmetries, repeat step 12), in enforcement step 4) time, by guide rail, drawing charger is rotated respectively to 45 °, namely complete the geosynthetics sample pull-out test under 25kPa, 50kPa, 100kPa, 200kPa and 400kPa vertical pressure when 45 ° respectively of pending pull-out test；
14) geosynthetics sample and normal stress σ, the shear stress τ on test soil sample interface and drawing rub coefficient f of pending pull-out test are calculated:
Wherein:
σ is geosynthetics sample and the normal stress on test soil sample interface of pending pull-out test；
P is vertical load, and the unit of described vertical load is kN；
A is upper test box internal diameter area, and the unit of described upper test box internal diameter area is m2；
Wherein:
τ is geosynthetics sample and the shear stress on test soil sample interface of pending pull-out test, and the unit of described shear stress is kPa；
TdBeing drawing load, the unit of described drawing load is kN；
Wherein:
F is geosynthetics sample and the drawing rub coefficient on test soil sample interface of pending pull-out test；
15) draw the relation curve of different vertical stress σ and shear stress peak value τ, try to achieve the geosynthetics sample of pending pull-out test and the angle of friction at test soil sample interface and apparent cohesion；
16) draw geosynthetics sample and the step 2 of pending pull-out test) in angle of friction and apparent cohesion envelope diagram between the test soil sample filled。
The invention have the advantage that
The invention provides a kind of geosynthetics anisotropy pull-out test system and implementation thereof, this geosynthetics anisotropy pull-out test system includes test-bed, lower test box, upper test box, drawing charger, advance ball, guide rail, graduated disc, vertical loading device, hold-down support, loading plate, fixture, displacement transducer, signal acquisition and control device, reaction frame, counter-force bar。Test-bed is provided with graduated disc and guide rail；Drawing charger end is provided with fixture and displacement transducer, and displacement transducer is used for testing fixture displacement in pull-out test process；Vertical loading device is further applied load by loading plate upwards test box；Signal acquisition and control device is connected with drawing charger, vertical loading device and displacement transducer respectively, is used for controlling drawing charger and vertical loading device loading and gathering displacement transducer data。What the present invention innovated have employed the geosynthetics sample of circle, makes to keep during each geosynthetics sample pull-out test the concordance of material, efficiently solves the randomness of geosynthetics sampling。Simultaneously, drawing charger is driven to rotate by guide rail and advance ball, achieve the arbitrarily angled pull-out test of geosynthetics test and test soil sample, revolutionary create geosynthetics anisotropy pull-out test system, it is achieved that the anisotropy test of geosynthetics pull-out test mechanical property；This pilot system has taken into full account the anisotropy of geosynthetics mechanical property, effectively prevent experimental test value and the problem of geosynthetics actual loading characteristic grave fault in current specifications, solve the potential safety hazard existed in geosynthetics engineer applied。
Accompanying drawing explanation
Fig. 1 is the facade structures schematic diagram of geosynthetics anisotropy pull-out test system provided by the present invention；
Fig. 2 is the plan structure schematic diagram of Fig. 1；
Description of reference numerals is as follows: test box under 1-；The upper test box of 2-；3-drawing charger；4-advance ball；5-guide rail；6-graduated disc；7-vertical loading device；8-hold-down support；9-loading plate；10-fixture；11-displacement transducer；12-geosynthetics sample；13-signal acquisition and control device；14-reaction frame；15-counter-force bar；16-test-bed。
Detailed description of the invention
Below in conjunction with accompanying drawing and specific embodiment, geosynthetics anisotropy pull-out test system and the implementation thereof of the present invention are described in further detail:
Embodiment:
Referring to Fig. 1 and Fig. 2, a kind of geosynthetics anisotropy pull-out test system, including lower test box 1, upper test box 2, drawing charger 3, advance ball 4, guide rail 5, graduated disc 6, vertical loading device 7, hold-down support 8, loading plate 9, fixture 10, displacement transducer 11, signal acquisition and control device 13, reaction frame 14, counter-force bar 15 and test-bed 16。
Test-bed 16 is provided with graduated disc 6 and guide rail 5；Drawing charger 3 end is provided with fixture 10 and displacement transducer 11, and displacement transducer 11 is used for testing fixture 10 displacement in pull-out test process；Vertical loading device 7 is further applied load by loading plate 9 upwards test box 2；Signal acquisition and control device 13 is connected with drawing charger 3, vertical loading device 7 and displacement transducer 11 respectively, is used for controlling drawing charger 3 and vertical loading device 7 loads and gather displacement transducer 11 data。
Lower test box 1 is semiclosed hollow cylinder；The internal diameter of lower test box 1 is 300mm, and the thickness of lower test box 1 is 5mm, is highly 100mm；Upper test box 2 is the regular polygon cylinder containing inscribed circle；The internal diameter of upper test box 2 is 200mm, and the most weakness thickness of the wall thickness of upper test box 2 is 3mm, and the height of upper test box 2 is 100mm, and the difference of the regular polygon external diameter of upper test box 2 and lower test box 1 internal diameter is more than 80mm。Regular polygon cylinder is regular hexagon cylinder。
Test-bed 16 is connected by draw-in groove is fixing with lower test box 1。
Upper test box 2 is fixed by hold-down support 8, and hold-down support 8 one end and counter-force bar 15 are rigidly connected。
The diameter of loading plate 9 is not less than the difference of 190mm, the diameter of loading plate 9 and upper test box 2 internal diameter should within the scope of 5～10mm。
Guide rail 5 is provided with limited impression and the advance ball 4 being placed in limited impression；Drawing charger 3 is connected with guide rail 5 by advance ball 4 and is freely slided on guide rail 5。
It is 210mm that fixture 10 clamps the width of the geosynthetics sample 12 of pending pull-out test。
The drawing speed of drawing charger 3 is 0.5mm/min。
The implementation of above-mentioned geosynthetics anisotropy pull-out test system, its step is as follows:
A) cutting geosynthetics sample 12, the circular in cross-section of geosynthetics sample 12, the diameter of geosynthetics sample 12 is identical with the external diameter of the lower test box 1 of geosynthetics anisotropy pull-out test system；
B) the upper test box 2 of geosynthetics anisotropy pull-out test system and lower test box 1 are unloaded, filling test soil sample, test soil sample compactness in upper test box 2 and in lower test box 1 actual compactness on-the-spot with engineer applied is consistent, in lower test box 1, the height of filling test soil sample is identical with the box height of lower test box 1, and in upper test box 2, the height of filling test soil sample is 80mm；
C) being layed in by geosynthetics sample 12 on the upper surface of the test soil sample within lower test box 1, geosynthetics sample 12 keeps smooth, unfolded and corrugationless；
D) lower test box 1 is mounted on test-bed 16, locates geosynthetics sample 12 position by graduated disc 6 labelling 0 °；
E) install test box 2, regulate hold-down support 8, by the horizontal displacement of the upper test box 2 of hold-down support 8 constraint；
F) regulate vertical loading device 7, loading plate 9 is applied vertical load, make loading plate 9 contact well with test soil sample surface；
G) regulating drawing charger 3, on drawing charger 3, fixture 10 clamps the geosynthetics sample 12 of pending pull-out test, and gripping width is 210mm。
H) applying 25kPa vertical load by vertical loading device 7, loading consolidation time is 30min。Load after consolidation completes and apply 0.1kPa horizontal loading by drawing charger 3, make drawing charger 3 and geosynthetics sample 12 stress everywhere tighten, displacement transducer 11 reading is adjusted to zero。
I) apply horizontal loading by drawing charger 3, start drawing, survey and read and record displacement and horizontal pull。Drawing speed presses strain controlling loading, and drawing speed is 0.5mm/min。
J) there is peak value in the horizontal loading applied when drawing charger 3, or test carry out to horizontal loading be stationary value time, test completes。
K) different geosynthetics samples 12 is selected, repeat step B)～step J), implement step D) time, according to being marked, geosynthetics sample 12 is placed on lower test box 1 same position place, apply one piece of geosynthetics sample 12 of each test under the vertical pressure of 50kPa, 100kPa, 200kPa and 400kPa respectively through vertical loading device 7, namely complete geosynthetics sample 12 pull-out test under different vertical pressures when 0 °；
L) different geosynthetics samples 12 is selected, repeat step B)～step K), implement step D) time, according to being marked, geosynthetics sample 12 is placed on lower test box 1 same position place, when implementing step G, by guide rail by drawing charger to rotating to 22.5 °, one piece of geosynthetics sample 12 of each test under 25kPa, 50kPa, 100kPa, 200kPa and 400kPa vertical pressure respectively, namely completes geosynthetics sample 12 pull-out test under different vertical pressures when 22.5 °；
M) judge that geosynthetics sample 12 is 90 ° of symmetries or 45 ° of symmetries；If 90 ° of symmetries, repeat step L), implement step D) time, by guide rail, drawing charger is rotated respectively to 45 °, 67.5 ° and 90 °, namely complete geosynthetics sample 12 pull-out test under 25kPa, 50kPa, 100kPa, 200kPa and 400kPa vertical pressure when 45 °, 67.5 ° and 90 ° respectively；If 45 ° of symmetries, repeat step L), implement step D) time, by guide rail, drawing charger is rotated respectively to 45 °, namely complete geosynthetics sample 12 pull-out test under 25kPa, 50kPa, 100kPa, 200kPa and 400kPa vertical pressure when 45 ° respectively；
N) geosynthetics sample 12 and the normal stress on test soil sample interface, shear stress and drawing rub coefficient are calculated:
In formula, σ is geosynthetics sample 12 and the normal stress on test soil sample interface；P is vertical load kN, A is upper test box internal diameter area (m2),
In formula, τ is geosynthetics sample 12 and the shear stress kPa on test soil sample interface；TdDrawing load kN。
In formula, f is geosynthetics sample 12 and the drawing rub coefficient on test soil sample interface。
O) relation curve of different vertical stress σ and shear stress peak value τ, angle of friction and the apparent cohesion tried to achieve geosynthetics sample 12 with test soil sample interface are drawn。
P) angle of friction and apparent cohesion envelope diagram between the test soil sample filled in geosynthetics sample 12 and step B is drawn。
By HDPE direction earthwork grille (a kind of type of geosynthetics) is carried out pull-out test result, when drawing angle is 45 °, it is considered to the test of geosynthetics anisotropy pull-out test obtains geosynthetics sample 12 and the test actual angle of friction of soil sample and apparent cohesion is only respectively and does not consider that geosynthetics anisotropy pull-out test tests the 68% and 73% of angle of friction and the apparent cohesion obtained。Can be seen that, when adopt do not consider that the geosynthetics anisotropy pull-out test angle of friction that obtains of test and apparent cohesion carry out geosynthetics engineering design time, designing and calculating meets the possible physical security of engineering of security performance requirement can be unsatisfactory for requirement, and construction quality and people life property safety in serious threat。To sum up, the present invention has taken into full account the anisotropy of geosynthetics mechanical property, effectively prevent experimental test value and the problem of geosynthetics actual loading characteristic grave fault in current specifications, thoroughly solve the potential safety hazard existed in geosynthetics engineer applied。
What finally illustrate is, above example is only in order to illustrate technical scheme and unrestricted, although the present invention being described in detail with reference to most preferred embodiment, it will be understood by those within the art that, technical scheme can be modified or equivalent replacement, without deviating from objective and the scope of technical solution of the present invention, it all should be encompassed in the middle of scope of the presently claimed invention。
Claims (10)
1. a geosynthetics anisotropy pull-out test system, it is characterised in that: described geosynthetics anisotropy pull-out test system includes test-bed (16), lower test box (1), upper test box (2), drawing charger (3), guide rail (5), graduated disc (6), vertical loading device (7), displacement transducer (11), signal acquisition and control device (13) and is used for clamping the fixture (10) of the geosynthetics sample (12) of pending pull-out test；The upper surface of described test-bed (16) is provided with the graduated disc (6) of circle, guide rail (5) and lower test box (1)；Described guide rail (5) and graduated disc (6) are arranged concentrically；Described drawing charger (3) is arranged on guide rail (5) and above and freely slides on guide rail (5)；Described drawing charger (3) is provided with the displacement transducer (11) for measured material (10) displacement；It is upper and be in the circle centre position of guide rail (5) and graduated disc (6) that described vertical loading device (7), upper test box (2), the geosynthetics sample (12) of pending pull-out test and lower test box (1) are successively set on test-bed (16) from top to bottom；Described signal acquisition and control device (13) is connected with drawing charger (3), displacement transducer (11) and vertical loading device (7) respectively。
2. geosynthetics anisotropy pull-out test system according to claim 1, it is characterised in that: described geosynthetics anisotropy pull-out test system also includes hold-down support (8), reaction frame (14) and the counter-force bar (15) being connected with reaction frame (14)；Described vertical loading device (7) is arranged on reaction frame (14)；Described upper test box (2) is connected with counter-force bar (15) by hold-down support (8)。
3. geosynthetics anisotropy pull-out test system according to claim 2, it is characterised in that: described guide rail (5) is provided with limited impression and the advance ball (4) being placed in limited impression；Described drawing charger (3) is connected with guide rail (5) by advance ball (4) and freely slides on guide rail (5)。
4. geosynthetics anisotropy pull-out test system according to claim 3, it is characterised in that: described geosynthetics anisotropy pull-out test system also includes the loading plate (9) being arranged between vertical loading device (7) and upper test box (2)；Described vertical loading device (7) applies vertical load by loading plate (9) upwards test box (2)。
5. geosynthetics anisotropy pull-out test system according to claim 4, it is characterized in that: the diameter of described loading plate (9) is not less than the difference of the internal diameter of 190mm, the diameter of described loading plate (9) and upper test box (2) within the scope of 5～10mm。
6. the geosynthetics anisotropy pull-out test system according to claim 1 or 2 or 3 or 4 or 5, it is characterised in that: described lower test box (1) is semi-enclosed hollow cylinder；The internal diameter of described lower test box (1) is not less than 300mm, and the thickness of described lower test box (1) is not less than 5mm, is highly not less than 50mm；Described upper test box (2) is the regular polygon cylinder containing inscribed circle；The internal diameter of described upper test box (2) is not less than 200mm, the most weakness thickness of the wall thickness of described upper test box (2) is not less than 3mm, the height of described upper test box (2) is not less than the difference of 100mm, the external diameter of described upper test box (2) and lower test box (1) internal diameter and is not less than 80mm。
7. geosynthetics anisotropy pull-out test system according to claim 6, it is characterised in that: described regular polygon cylinder is regular hexagon cylinder or octagon cylinder。
8. geosynthetics anisotropy pull-out test system according to claim 7, it is characterised in that: the width of the geosynthetics sample (12) that described fixture (10) clamps pending pull-out test is not less than 200mm。
9. geosynthetics anisotropy pull-out test system according to claim 8, it is characterised in that: the drawing speed of described drawing charger (3) is between 0.05mm/min to 50mm/min。
10. the implementation that based on the geosynthetics anisotropy pull-out test system as described in claim 1-9 any claim, geosynthetics is carried out anisotropy pull-out test, it is characterised in that: said method comprising the steps of:
1) the geosynthetics sample (12) of pending pull-out test is cut, the circular in cross-section of the geosynthetics sample (12) of described pending pull-out test, the diameter of the geosynthetics sample (12) of described pending pull-out test is identical with the external diameter of the lower test box (1) of geosynthetics anisotropy pull-out test system；
2) upper test box (2) and the lower test box (1) of geosynthetics anisotropy pull-out test system are unloaded, filling test soil sample, test soil sample compactness in upper test box (2) and in lower test box (1) actual compactness on-the-spot with engineer applied is consistent, in described lower test box (1), the height of filling test soil sample is identical with the box height of lower test box (1), and in described upper test box (2), the height of filling test soil sample is not less than 50mm；
3) being layed in by the geosynthetics sample (12) of pending pull-out test on the upper surface of the internal test soil sample of lower test box (1), the geosynthetics sample (12) of pending pull-out test keeps smooth, unfolded and corrugationless；
4) lower test box (1) is mounted on test-bed (16), is located geosynthetics sample (12) position of pending pull-out test by graduated disc (6) labelling 0 °；
5) install test box (2), regulate hold-down support (8), by the horizontal displacement of test box (2) in hold-down support (8) constraint；
6) regulate vertical loading device (7), loading plate (9) is applied vertical load, make loading plate (9) contact well with test soil sample surface；
7) regulating drawing charger (3), the upper fixture (10) of drawing charger (3) clamps the geosynthetics sample (12) of pending pull-out test, and gripping width is not less than 200mm；
8) apply 25kPa vertical load by vertical loading device (7), load consolidation time and be not less than 20min；Load after consolidation completes and apply 0.05-0.1kPa horizontal loading by drawing charger (3), geosynthetics sample (12) stress everywhere making drawing charger (3) and pending pull-out test is tightened, and displacement transducer (11) reading is adjusted to zero；
9) apply horizontal loading by drawing charger (3), start drawing, survey and read and record displacement and horizontal pull；Drawing speed presses strain controlling loading, and drawing speed is between 0.05mm/min to 50mm/min；
10) horizontal loading applied when drawing charger (3) occur peak value or test carry out to horizontal loading be stationary value time, test completes；
11) the geosynthetics sample (12) of different pending pull-out tests is selected, repeat step 2)～step 10), in enforcement step 4) time, according to being marked, the geosynthetics sample (12) of pending pull-out test is placed on lower test box (1) same position place, 50kPa is applied respectively through vertical loading device (7), 100kPa, each geosynthetics sample (12) testing one piece of pending pull-out test under the vertical pressure of 200kPa and 400kPa, namely geosynthetics sample (12) pull-out test under different vertical pressures when 0 ° of pending pull-out test is completed；
12) the geosynthetics sample (12) of different pending pull-out tests is selected, repeat step 2)～step 11), in enforcement step 4) time, according to being marked, the geosynthetics sample (12) of pending pull-out test is placed on lower test box (1) same position place, by guide rail (5), drawing charger (3) is extremely rotated to 22.5 ° simultaneously, respectively at 25kPa, 50kPa, 100kPa, each geosynthetics sample (12) testing one piece of pending pull-out test under 200kPa and 400kPa vertical pressure, namely geosynthetics sample (12) pull-out test under different vertical pressures when 22.5 ° of pending pull-out test is completed；
13) the geosynthetics sample (12) judging pending pull-out test is 90 ° of symmetries or 45 ° of symmetries；If 90 ° of symmetries, repeat step 12), simultaneously in enforcement step 4) time, by guide rail (5), drawing charger (3) is rotated respectively to 45 °, 67.5 ° and 90 °, namely complete geosynthetics sample (12) pull-out test under 25kPa, 50kPa, 100kPa, 200kPa and 400kPa vertical pressure when 45 °, 67.5 ° and 90 ° respectively of pending pull-out test；If 45 ° of symmetries, repeat step 12), in enforcement step 4) time, by guide rail, drawing charger is rotated respectively to 45 °, namely complete geosynthetics sample (12) pull-out test under 25kPa, 50kPa, 100kPa, 200kPa and 400kPa vertical pressure when 45 ° respectively of pending pull-out test；
14) geosynthetics sample (12) and normal stress σ, the shear stress τ on test soil sample interface and drawing rub coefficient f of pending pull-out test are calculated:
Wherein:
σ is geosynthetics sample (12) and the normal stress on test soil sample interface of pending pull-out test；
P is vertical load, and the unit of described vertical load is kN；
A is upper test box internal diameter area, and the unit of described upper test box internal diameter area is m2；
Wherein:
τ is geosynthetics sample (12) and the shear stress on test soil sample interface of pending pull-out test, and the unit of described shear stress is kPa；
TdBeing drawing load, the unit of described drawing load is kN；
Wherein:
F is geosynthetics sample (12) and the drawing rub coefficient on test soil sample interface of pending pull-out test；
15) draw the relation curve of different vertical stress σ and shear stress peak value τ, try to achieve the geosynthetics sample (12) of pending pull-out test and the angle of friction at test soil sample interface and apparent cohesion；
16) draw geosynthetics sample (12) and the step 2 of pending pull-out test) in angle of friction and apparent cohesion envelope diagram between the test soil sample filled。
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