CN100494966C - Testing box for measuring anti-pulling force of soil nailing mechanical property - Google Patents
Testing box for measuring anti-pulling force of soil nailing mechanical property Download PDFInfo
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- CN100494966C CN100494966C CNB2004100946397A CN200410094639A CN100494966C CN 100494966 C CN100494966 C CN 100494966C CN B2004100946397 A CNB2004100946397 A CN B2004100946397A CN 200410094639 A CN200410094639 A CN 200410094639A CN 100494966 C CN100494966 C CN 100494966C
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- 239000002689 soil Substances 0.000 title claims abstract description 122
- 238000012360 testing method Methods 0.000 title claims abstract description 83
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 230000000694 effects Effects 0.000 claims description 11
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 230000003014 reinforcing effect Effects 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 5
- 239000003657 drainage water Substances 0.000 claims description 3
- 239000011888 foil Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 239000004567 concrete Substances 0.000 abstract description 2
- 239000011435 rock Substances 0.000 abstract 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000004568 cement Substances 0.000 description 4
- 230000002950 deficient Effects 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 210000001956 EPC Anatomy 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention relates to a pulling resistance testing box for earth nail. Said testing box includes the following several portions: a testing box main body with first additional chamber and second additional chamber, rock and soil sample, earth nail, an upper cover plate, a rubber water bag and a pulling force applying device. Said invention also provides the concrete structure and mounting mode of the above-mentioned every portion and the working principle of said testing box.
Description
Technical field
The present invention relates to a kind of proving installation that is used for building field, refer to a kind of withdrawal resistance test box especially, be used to measure the mechanical property of soil nailing.
Background technology
According to statistics, the rarest 50,000 slopes, Hong Kong, slope stabilization generally adopts soil nailing (soil nail) (a kind of member of cement pouring reinforcing bar) Way of Engineering Technology in Control of Underground at present.The engineering staff holes on the slope with drilling machine earlier, squeezes into soil nailing then.100 holes may minimumly will be bored in a slope, use up to a hundred soil nailings.
In addition, soil nailing also is used for the pattern foundation pit supporting structure of buildings, it makes full use of the intensity of the soil body self, by the soil nailing that metal rods such as reinforcing bar constitute is set in the soil body in position, share external force and deadweight that the soil body bears, improve the stressing conditions of the soil body, and construct bar-mat reinforcement sprayed concrete surface layer, make soil nailing, surface layer and original position soil body three constitute an integral body and co-operation at the excavation face.Plate brad supporting has easy construction, dependable performance and outstanding economic performance, and simultaneously, very little to the influence of surrounding environment in the work progress of plate brad supporting, therefore, plate brad supporting is widely used in the deep excavation project.In the fundamental construction of the many provinces and cities in the whole nation, plate brad supporting has been brought into play vital role, has created remarkable economic efficiency.
In Excavation Process, the development of soil nailing stress has directly reflected the effect that soil nailing is brought into play in whole building enclosure.With regard to internal stability,, illustrate that building enclosure is safe if soil nailing is stressed less; If soil nailing is stressed excessive, then might takes place between soil nailing surrender or soil nailing and the surrounding soil slippage to take place, and cause the destruction of building enclosure.In the soil nailing duty, the load of bearing generally is the pulling capacity of earth, so determine the draft that soil nailing can bear in project engineering stage, promptly the resistance to plucking ability of soil nailing is very important.
Soil nailing generally is the building element with round section or other version that is arranged in ground, is used to measure the resistance to plucking ability of soil nailing or the testing tool of shearing strength is withdrawal resistance test box (Pulloutbox).The water saturation of ground is very important for the force-bearing situation of soil nailing.But existing withdrawal resistance test box does not have the effective means that increases water saturation.Existing withdrawal resistance test box also has following defective: (a) after the beginning drawing, the stress that acts on the soil nailing is uneven.(b), also be difficult to realize the water saturation of ground although used carbon dioxide.(c) stress on the energy measurement soil nailing not.
As from the foregoing, need provide a kind of new soil nailing withdrawal resistance proving installation, to overcome defective of the prior art.
Summary of the invention
The purpose of this invention is to provide a kind of new soil nailing withdrawal resistance test box, it can guarantee that in test process, the stress that acts on the soil nailing is even.
Another object of the present invention is to improve the water saturation of the ground sample in this test box.
A further object of the present invention makes this test box can measure the stress on the soil nailing easily.
To achieve these goals, the invention provides a kind of new soil nailing withdrawal resistance test box, comprise: a test box main body, its cuboid and upper end that is hollow is uncovered, the left and right sides face of this test box main body convexes with one first additional chamber and one second additional chamber that is connected with this test box main body respectively, is filled with the ground sample in this test box main body and this first additional chamber; Soil nailing to be tested is arranged in this test box main body, and an end of this soil nailing is contained in this first additional chamber, and the other end is aimed at this second additional chamber; One upper cover plate is detachably connected to the upper end of this test box main body, is used to seal this test box main body; One rubber water bag is arranged between the upper surface of the lower surface of this upper cover plate and this ground sample, is filled with water under high pressure in this rubber water bag, is used for this ground sample is applied the pressure of vertical direction; One pulling capacity bringing device is arranged on this second additional chamber, one side of this test box main body, and this pulling capacity bringing device is connected with the other end of this soil nailing, is used for this soil nailing is applied pulling capacity; When this test box work, measure the pulling capacity and the displacement of this soil nailing under this pulling capacity effect that are applied on this soil nailing, can obtain the anti-pulling ability of this soil nailing to be tested.
Aforesaid soil nailing withdrawal resistance test box, wherein this pulling capacity bringing device comprises: an outside steel bar is used to transmit pulling capacity; One unitor, one end are arranged in this second additional chamber, are used to connect the reinforcing bar of this soil nailing, and the other end is positioned at outside this second additional chamber, are used to connect this outside steel bar; One hydraulic jack is used to apply pulling capacity to this outside steel bar; One drawing load reactive forces framework is arranged between this test box main body and this hydraulic jack, is used to bear the reacting force that this hydraulic jack produces; Wherein, end at this outside steel bar is provided with a reaction-force plate by a nut, the lengthwise position of this reaction-force plate on this steel bar can be regulated by this nut, the force side of this hydraulic jack is replaced on this reaction-force plate, and the base end of this hydraulic jack is by this drawing load reactive forces framework supporting.
Aforesaid soil nailing withdrawal resistance test box, wherein this pulling capacity bringing device further comprises: the LVDT displacement transducer, be arranged on the side that this unitor is positioned at this second additional chamber outside, be used to measure the displacement of this soil nailing under this pulling capacity effect; Dynamometer is arranged between this hydraulic jack and the drawing load reactive forces framework, is used to measure the size of the pulling capacity that this hydraulic jack applies.
Aforesaid soil nailing withdrawal resistance test box, wherein on this second additional chamber, be used for the position with pores that this unitor passes, be provided with an O-ring seal, be used to guarantee the sealing state of this test box main body, guarantee the pressure of ground sample.
Aforesaid soil nailing withdrawal resistance test box wherein in the position of the water in-out port of rubber water bag, is provided with a pressure gauge, is used to measure this robber cement water-in-bag and presses; By injection water in this rubber water bag or from wherein drainage water, the size of exerting pressure of this rubber water bag of scalable.
Aforesaid soil nailing withdrawal resistance test box wherein at the upper surface and the lower surface of this soil nailing, is provided with a plurality of soil pressure meters, is used to measure the ground pressure that acts on the soil nailing surface.
Aforesaid soil nailing withdrawal resistance test box wherein is filled with the water of removing air in this ground sample, like this, under the backwater pressure effect that this rubber water bag applies, can increase the water saturation of this ground sample.
Aforesaid soil nailing withdrawal resistance test box wherein between this rubber water bag and this ground sample, is provided with a distance piece, with so that pressure evenly distributes.
Aforesaid soil nailing withdrawal resistance test box, wherein also be respectively arranged with the reacting force framework in four sides of this test box main body, all in addition fastening between the reacting force framework of upper surface and lower surface, between the reacting force framework on left surface and right surface by bar and nut, thereby when can guarantee to exert pressure on soil nailing, deformation can not take place in this test box main body.
Aforesaid soil nailing withdrawal resistance test box wherein is equipped with foil gauge on the reinforcing bar of this soil nailing, to measure the strain of soil nailing.
The invention has the beneficial effects as follows that withdrawal resistance test box of the present invention has overcome three defectives of prior art.Because test box of the present invention is provided with the rubber water bag, thereby can evenly exert pressure at the length direction of this test box, thereby the ground pressure of guarantee effect on this soil nailing remains evenly.In addition, owing to be filled with the water of removing air in the ground sample of the present invention, this test box remains the state of integral sealing simultaneously, so at the pressure of this rubber water bag with act under the acting in conjunction of the anti-pore water pressure in the soil, can improve the water saturation of this ground sample greatly.Also have, a plurality of soil pressure meters are set, can measure the size that acts on the accurate soil pressure on this soil nailing easily by upper and lower surface at this soil nailing.
The invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is the longitudinal sectional drawing of soil nailing withdrawal resistance test box of the present invention;
Fig. 2 is the transverse cross-sectional view of soil nailing withdrawal resistance test box of the present invention.
Embodiment
As illustrated in figs. 1 and 2, withdrawal resistance test box 10 of the present invention comprises a test box main body 11, and this test box main body 11 is the cuboid of hollow, and its inner filling has ground sample 12, this ground sample for example can be the granite ground that decomposes fully, i.e. CDG ground.These test box main body 11 upper end open, this opening is by a cover plate 30 sealings.Below this cover plate 30, ground sample 12 upper surfaces are provided with a rubber water bag 31, come ground sample 12 is applied the pressure of vertical direction by this rubber water bag 31.At first in ground sample 12, charge into carbon dioxide, the water of removing air is charged in this ground sample 12, apply pressure at right angle by the ground sample 12 in 31 pairs of casings 11 of this rubber water bag then.Adopt these measures will increase the water saturation of this ground sample 12, thereby imitate environmental aspect more truly.Water inlet/water delivering orifice 34 places at this rubber water bag 31 are equipped with a pressure gauge 32, by injecting or drainage water in this rubber water bag 31, can regulate the size of this pressure at right angle.In addition, in order to make the pressure that acts on the ground sample 12 even, between this rubber water bag 31 and this ground sample 12, also be provided with a wall 33.
Be provided with one first additional chamber 13 in a side of this casing main body, in this first additional chamber 13, be filled with same ground sample 12.Be drilled with a hole in the two sides of this casing main body 11 and ground sample 12, this hole extends in first additional chamber 13 in left side always.Place a reinforcing bar 14 in this hole, then with the cement pouring, finally form soil nailing 15 to be tested, the cement pouring in the ground sample 12 of this casing main body 11, the one end is arranged in first additional chamber 13 in left side.
Also be connected with one second additional chamber 16 on the right side of this casing main body 11, this second additional chamber 16 is aimed at the head of this soil nailing 15.Test box of the present invention also comprises a pulling capacity bringing device, is arranged on these second additional chamber, 16 1 sides of this test box main body 11, and this pulling capacity bringing device is connected with head one end of this soil nailing 15, is used for this soil nailing is applied pulling capacity.This pulling capacity bringing device comprises a unitor 17, and its reinforcing bar 14 with this soil nailing 15 is connected on the outside steel bar 18.Pass the position of the perforate of this second additional chamber 16 at unitor 17, be provided with an O-ring seal 20, be used to seal this unitor 17 and this right side second additional chamber 16.This first additional chamber and second additional chamber seal, thereby prevent the leakage of moisture content.This outside steel bar 18 is connected on the hydraulic jack, and the drawing load of this soil nailing 15 is provided by this hydraulic jack.Simultaneously, as shown in Figure 1, an end that is positioned at this second additional chamber 16 at this unitor 17 is provided with 2 LVDT displacement transducers 21, is used to measure the displacement of extracting of this soil nailing 15.In addition, be provided with a dynamometer 19, it is connected with this hydraulic jack, is used to measure the size that this lifting jack is applied to the pulling capacity on this soil nailing.
Upper surface and lower surface at this soil nailing 15 are equipped with six soil pressure meters (EPCs) 40, act on the pressure of the ground sample on this soil nailing 15 with direct measurement.Also the foil gauge (not shown) can be installed on this reinforcing bar 14, measuring the strain of soil nailing 15, can utilize the Young modulus of this known soil nailing to calculate load and its surperficial friction force on this soil nailing by this strain value that measures.
In order to make this test box main body 11 under the situation of bearing big pressure, deformation not to take place, four sides in this main body 11 also can be provided with reacting force framework 50, all in addition fastening between the reacting force framework of upper surface and lower surface, between the reacting force framework on left surface and right surface by bar 51 and nut 52, thus can further guarantee to be applied to pressure on the soil nailing 15.
In addition, shown in the right side of Fig. 1 is divided, further described the concrete structure of an example of this pulling capacity bringing device.Be applied on this soil nailing 15 for the ease of the pulling capacity that hydraulic jack is produced, between the reacting force framework 50 and this hydraulic jack on the right side of test box main body, a drawing load reactive forces framework 53 also can be set, and dynamometer 19 is arranged between the base of drawing load reactive forces framework 53 and this lifting jack.Like this, the reacting force of this pulling capacity is delivered on this reacting force framework 50 by this dynamometer 19.
And, be applied on this outside steel bar 18 for the ease of the pulling capacity that this hydraulic jack is produced, end at this outside steel bar 18 is provided with a reaction-force plate 55 by nut 54, this lifting jack is resisted against on this reaction-force plate 55, thereby the pulling capacity that this lifting jack is produced is delivered to this outside steel bar 18 by this reaction-force plate 55, is delivered on this soil nailing 15 by this unitor 17 then.This reaction-force plate 55 can be regulated by this nut 54 along the axial location of this outside steel bar 18.
The process of utilizing test box of the present invention that soil nailing is tested is described below.
After at first soil nailing being formed in this test box, cover plate 30 is fastened on the test box main body 11 by screw,, regulates the size of the pressure at right angle that applies by this rubber water bag 31 by injecting or discharge the water of this rubber water bag.At this moment, read the output of these six soil pressure meters 40, make the pressure at right angle that acts on this soil nailing reach a predetermined value.This predetermined value has been simulated under actual condition, the ground extruding force that this soil nailing 15 is born.Operate this hydraulic jack then, make this hydraulic jack on this soil nailing, apply a drawing load by this unitor 17, measure the output of this displacement transducer LVDT 21 then, obtain the shift value of this soil nailing under this load effect, the value of this drawing load that draws in conjunction with this dynamometer 19 just can obtain the resistance to plucking ability of this soil nailing.
This laboratory is approximate simulation to field condition with the terms and conditions of soil nailing withdrawal resistance test box, thereby this test box can be used for the testing research of soil nailing withdrawal resistance.
Withdrawal resistance test box of the present invention has overcome three defectives of prior art.Because test box of the present invention is provided with the rubber water bag, thereby can evenly exert pressure at the length direction of this test box, thereby the ground pressure of guarantee effect on this soil nailing remains evenly.In addition, owing to be filled with the water of removing air in the ground sample of the present invention, this test box remains the state of integral sealing simultaneously, so under the pressure effect of this rubber water bag, can improve the water saturation of this ground sample greatly.Also have, a plurality of soil pressure meters are set, can measure the accurate stress size that acts on this soil nailing easily by upper and lower surface at this soil nailing.
Need to prove that more than explanation only is a specific embodiment of the present invention, can carry out various equivalences to the present invention and replace.For example, this pulling capacity bringing device is not limited to the form of above-mentioned hydraulic jack, and can adopt multiple other form, and for example electromagnetism bringing device, pneumatic bringing device or the like are included in the claim of the present invention.So claim of the present invention is determined by the claims of enclosing.
Claims (8)
1, a kind of soil nailing withdrawal resistance test box is characterized in that, comprising:
One test box main body (11), its cuboid and upper end that is hollow is uncovered, the left and right sides face of this test box main body (11) convexes with one first additional chamber (13) and one second additional chamber (16) that is connected with this test box main body respectively, is filled with ground sample (12) in this test box main body and this first additional chamber; Soil nailing to be tested (15) is arranged in this test box main body, and an end of this soil nailing (15) is contained in this first additional chamber (13), and the other end is aimed at this second additional chamber (16);
One upper cover plate (30) is detachably connected to the upper end of this test box main body (11), is used to seal this test box main body;
One rubber water bag (31) is arranged between the upper surface of the lower surface of this upper cover plate (30) and this ground sample, is filled with water under high pressure in this rubber water bag, is used for this ground sample is applied the pressure of vertical direction;
One pulling capacity bringing device is arranged on these second additional chamber (16) one sides of this test box main body (11), and this pulling capacity bringing device is connected with the other end of this soil nailing (15), is used for this soil nailing is applied pulling capacity;
This pulling capacity bringing device comprises: an outside steel bar (18) is used to transmit pulling capacity; One unitor (17), one end are arranged in this second additional chamber (16), are used to connect the reinforcing bar (14) of this soil nailing (15), and the other end is positioned at outside this second additional chamber (16), are used to connect this outside steel bar (18); One hydraulic jack is used to apply pulling capacity to this outside steel bar; One drawing load reactive forces framework (53) is arranged between this test box main body (11) and this hydraulic jack, is used to bear the reacting force that this hydraulic jack produces; End at this outside steel bar is provided with a reaction-force plate (55) by a nut (54), the axial location of this reaction-force plate on this steel bar can be regulated by this nut, the force side of this hydraulic jack is replaced on this reaction-force plate (55), and the base end of this hydraulic jack is by this drawing load reactive forces framework (53) supporting;
This pulling capacity bringing device further comprises: LVDT displacement transducer (21), and be arranged on this unitor (17) and be positioned at the outside side of this second additional chamber (16), be used to measure the displacement of this soil nailing under this pulling capacity effect; Dynamometer (19) is arranged between this hydraulic jack and the drawing load reactive forces framework, is used to measure the size of the pulling capacity that this hydraulic jack applies;
When this test box work, measure the pulling capacity and the displacement of this soil nailing under this pulling capacity effect that are applied on this soil nailing, can obtain the anti-pulling ability of this soil nailing to be tested.
2, soil nailing withdrawal resistance test box as claimed in claim 1, it is characterized in that, on this second additional chamber (16), be used for the position with pores that this unitor (17) passes, be provided with an O-ring seal (20), be used to guarantee the sealing state of this test box main body (11), guarantee the pressure of ground sample.
3, soil nailing withdrawal resistance test box as claimed in claim 1 is characterized in that, the position at the water in-out port (34) of rubber water bag (31) is provided with a pressure gauge (32), is used to measure the hydraulic pressure in this rubber water bag (31); By injection water in this rubber water bag or from wherein drainage water, the size of exerting pressure of this rubber water bag of scalable.
4, soil nailing withdrawal resistance test box as claimed in claim 1 is characterized in that, at the upper surface and the lower surface of this soil nailing (15), is provided with a plurality of soil pressure meters (40), is used to measure the ground pressure that acts on the soil nailing surface.
5, soil nailing withdrawal resistance test box as claimed in claim 1, it is characterized in that, in this ground sample (12), be filled with the water of removing air, like this, under the pressure effect of the vertical direction that this rubber water bag (31) applies, can increase the water saturation of this ground sample (12).
6, soil nailing withdrawal resistance test box as claimed in claim 1 is characterized in that, between this rubber water bag (31) and this ground sample (12), is provided with a distance piece (33), with so that pressure evenly distributes.
7, soil nailing withdrawal resistance test box as claimed in claim 1, it is characterized in that, four sides in this test box main body (11) also are respectively arranged with reacting force framework (50), all in addition fastening between the reacting force framework of upper surface and lower surface, between the reacting force framework on left surface and right surface by bar (51) and nut (52), thereby when can guarantee to exert pressure on soil nailing (15), deformation can not take place in this test box main body.
8, soil nailing withdrawal resistance test box as claimed in claim 1 is characterized in that, on the reinforcing bar (14) of this soil nailing (15) foil gauge is installed, to measure the strain of soil nailing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100946397A CN100494966C (en) | 2004-11-11 | 2004-11-11 | Testing box for measuring anti-pulling force of soil nailing mechanical property |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100946397A CN100494966C (en) | 2004-11-11 | 2004-11-11 | Testing box for measuring anti-pulling force of soil nailing mechanical property |
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| Publication Number | Publication Date |
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| CN1773241A CN1773241A (en) | 2006-05-17 |
| CN100494966C true CN100494966C (en) | 2009-06-03 |
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| CNB2004100946397A Active CN100494966C (en) | 2004-11-11 | 2004-11-11 | Testing box for measuring anti-pulling force of soil nailing mechanical property |
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| CN104819933B (en) * | 2015-05-20 | 2018-09-25 | 河海大学 | A kind of quiet dynamic adhesion sliding the Complete Curve experimental rig and its test method |
| CN105021523A (en) * | 2015-08-11 | 2015-11-04 | 攀枝花学院 | Geotechnical belt bonding force detection device |
| CN105547835A (en) * | 2016-01-19 | 2016-05-04 | 济南大学 | Indoor soil nail pull-out test device |
| CN106442121B (en) * | 2016-06-29 | 2019-07-19 | 西安工业大学 | A kind of research absciss layer is to the experimental rig and production method of bolt action load |
| CN106323868A (en) * | 2016-08-22 | 2017-01-11 | 水利部交通运输部国家能源局南京水利科学研究院 | Pullout test device of ribbed bar in earth-rock dam rockfill material and test method thereof |
| CN107228727B (en) * | 2017-06-28 | 2019-04-16 | 南京林业大学 | Nail puller nail-holding ability test device |
| CN107490543B (en) * | 2017-09-11 | 2020-11-10 | 京东方科技集团股份有限公司 | Device for simulating adhesion of double-sided adhesive tape and adhesion determination method |
| CN109187341B (en) * | 2018-10-23 | 2021-04-06 | 厦门市建筑科学研究院有限公司 | Method for sampling and detecting bonding strength of exterior facing reverse-beaten stone |
| CN109520839B (en) * | 2018-12-25 | 2023-12-15 | 西南交通大学 | Multifunctional test method for tensile property of shield tunnel bolt joint |
| CN110044698B (en) * | 2019-04-19 | 2021-09-21 | 郑州大学 | Soil nail drawing test box and soil nail drawing test device |
| CN110514585B (en) * | 2019-09-10 | 2024-07-23 | 中国水利水电第五工程局有限公司 | Sprayed concrete and surrounding rock bonding strength measuring device |
| CN112857782B (en) * | 2021-03-04 | 2022-12-13 | 郑州大学 | Soil nail stress simulation test device, soil nail and test method |
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2004
- 2004-11-11 CN CNB2004100946397A patent/CN100494966C/en active Active
Non-Patent Citations (2)
| Title |
|---|
| 塑料土工格栅加筋土抗拉拔特性试验研究. 马存明等.中国铁道科学，第25卷第3期. 2004 |
| 塑料土工格栅加筋土抗拉拔特性试验研究. 马存明等.中国铁道科学，第25卷第3期. 2004 * |
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| CN1773241A (en) | 2006-05-17 |
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