CN105758736A - In-situ direct shear device with self-balanced shear forces - Google Patents
In-situ direct shear device with self-balanced shear forces Download PDFInfo
- Publication number
- CN105758736A CN105758736A CN201410767366.1A CN201410767366A CN105758736A CN 105758736 A CN105758736 A CN 105758736A CN 201410767366 A CN201410767366 A CN 201410767366A CN 105758736 A CN105758736 A CN 105758736A
- Authority
- CN
- China
- Prior art keywords
- direct shear
- shear box
- box
- original position
- jack
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides an in-situ direct shear device with self-balanced shear forces. The device is used for measuring shearing parameters of in-situ rock soil at a transmission line tower foundation and subgrade position, so that bearing capacity of the transmission line tower foundation and subgrade is determined; the improvement is as follows: the in-situ direct shear device comprises an upper direct shear box, a bottom direct shear box, a balance groove and a jack; the upper shear box and the bottom shear box are hexahedrons, wherein two opposite sides are opened, openings of the upper direct shear box and the bottom direct shear box which are vertically arranged are opposite, and a cuboid cavity is formed inside; one side of the bottom direct shear box is horizontally arranged with a balancing groove, and the jack is horizontally arranged in the balancing groove; and one end of the jack is connected to the upper direct shear box, and the other end of the jack is connected to a vertical sidewall of the balancing groove. Compared with the prior art, the in-situ direct shear device with self-balanced shear forces realizes control of a soil sample shear plane and self-balance of horizontal loading, reduces working space of the horizontal loading, avoids disturbance to the direct shear soil sample, and improves accuracy of the measured data.
Description
Technical field
The present invention relates to a kind of original position direct shear apparatus, in particular to a kind of shearing self-balancing original position direct shear apparatus.
Background technology
Shear parameters is the important prospecting content of transmission tower engineering, is by ground and the important parameter of foundation bearing capacity calculating, measures usually through indoor direct shear test or in-situ direct shear test, and instrument is called indoor direct shear apparatus and original position direct shear apparatus.In-situ direct shear test is under keeping the undisturbed conditions of condition such as test soil body existing structure, density, humidity, in the shearing test that engineering construction place is carried out.Owing to in-situ direct shear test maintains the home state of the test soil body, therefore in-situ direct shear test data are more accurate, credible.
Through years development, original position direct shear apparatus has polytype, divides the quantity of direct shear box, has single direct shear box and double; two 2 kinds of types of direct shear box；Divide from loading structure, have self-balancing and 2 kinds of types of non-self-balancing；From Loading Control mode, there are Stress Control formula and 2 kinds of types of strain controlling formula；It addition, also there is the original position direct shear apparatus for the different soil property type such as weak soil, coarse-grained soil to be seen in report.
Above-mentioned original position direct shear apparatus is respectively arranged with pluses and minuses, as the simplest, light in single direct shear box original position direct shear apparatus, but shear surface shape and failure mode are wayward, adopts original position ground to do counter-force and generally requires bigger working space.Stress Control formula or strain controlling formula original position direct shear apparatus often have manual operation or the motor control mechanism of complexity, the accurate control of shear history can be realized, but there is also the drawback that the scale of construction is huge simultaneously, additionally, disturbance can be produced to shearing soil sample by shearing soil sample from the shifting sample process of original position immigration shear box, and strength of turbulence cannot be assessed.
In general, the test result that double-shear boxlike original position direct shear apparatus compares to single staight scissors boxlike original position direct shear apparatus is more accurate, reliable, and the suitable simplification to complex loading controlling organization is also more suitable for transmission tower foundation engineering investigation to the light-weighted demand of instrument.
Summary of the invention
In order to solve the problems referred to above, the invention provides a kind of shearing self-balancing original position direct shear apparatus, it is achieved that the self-balancing to the control of soil sample shear surface and horizontal addload, reduce the working space of horizontal addload, avoid the disturbance to staight scissors soil sample, improve the accuracy of measurement data.
It is an object of the invention to adopt following technical proposals to realize:
A kind of shearing self-balancing original position direct shear apparatus provided by the invention, for measuring the shear parameters of the original position Rock And Soil being positioned at transmission line tower foundation ground place, and then determine the bearing capacity of transmission line tower foundation and ground, it thes improvement is that: described original position direct shear apparatus includes direct shear box 1, lower direct shear box 3, compensating groove 4 and jack 8；Described upper direct shear box 1 and lower direct shear box 3 are hexahedron, its relative two sides opening, and the described upper direct shear box 1 being vertically arranged is corresponding with the opening of lower direct shear box 3, its Inner Constitution cuboid cavity；The side of described lower direct shear box 3 is horizontally disposed with compensating groove 4, and described jack 8 is horizontally set in compensating groove 4；One end of described jack 8 is connected with upper direct shear box 1, and the other end is connected with the upright side walls of compensating groove 4.
Wherein, described lower direct shear box 3, higher than compensating groove 4, sets gradually elbow 2 and pressure transducer 7 between described upper direct shear box 1 and jack 8.
Wherein, the angle that curves of described elbow 2 is 90 °, and orthogonal two end faces are connected with upper direct shear box 1 and compensating groove 4 respectively.
Wherein, made the shear surface between axis and upper shear box 1 and the down cut box 3 of the axis of jack 8, pressure transducer 7 coplanar by described elbow 2.
Wherein, displacement transducer 6 is set along the upper direct shear box 1 of described jack 8 direction of motion and the identical sidewall of lower direct shear box 3.
Wherein, institute's displacement sensors 6 includes base and probe, and described base is arranged on lower direct shear box 3 sidewall, and described probe is arranged on direct shear box 1 sidewall.
Wherein, it is respectively equipped with sidewise restraint plate 5 along the upper direct shear box 1 of described jack 8 direction of motion and the intersection, two side of lower direct shear box 3.
Wherein, described sidewise restraint plate 5 interval is symmetricly set on direct shear box 1 and the intersection, two side of lower direct shear box 3.
Wherein, described jack 8 includes push rod 81, oil filler point 82 and pressure controller 83；Described push rod 81 is connected with pressure transducer 7 and does rectilinear motion along the axis direction of jack 8.
Wherein, the staight scissors soil sample 9 being positioned at the original position Rock And Soil at transmission line tower foundation ground place is arranged on the cuboid cavity that described upper direct shear box 1 is constituted with lower direct shear box 3, and the volume of described staight scissors soil sample 9 and described cavity volume match.
Compared with the prior art, the present invention reaches to provide the benefit that:
1, shearing self-balancing original position direct shear apparatus provided by the invention, adopts upper and lower direct shear box can measure the relative displacement of the upper and lower soil body of shear surface, and displacement measurement science more is accurate.
2, shearing self-balancing original position direct shear apparatus provided by the invention, the shear surface that the elbow adopted can adjust between the axis of jack, the axis of pressure transducer and upper direct shear box and lower direct shear box is coplanar, avoid horizontal shear that the shear surface between upper direct shear box and lower direct shear box is produced additional bending moment, making shear surface uniform force, test result is more accurate.
3, shearing self-balancing original position direct shear apparatus provided by the invention, sidewise restraint plate constrains the rotary freedom between direct shear box and lower direct shear box, makes direct shear box and lower direct shear box that the unidirectional translation along axis direction only to occur, improves success of the test rate.
4, shearing self-balancing original position direct shear apparatus provided by the invention, simple in construction, dismounting facility, it is achieved the miniaturization of direct shear apparatus and lightweight.
5, shearing self-balancing original position direct shear apparatus provided by the invention, the compensating groove of employing, while realizing shearing self-balancing, reduces the excavation size that in-situ direct shear test is tested pits.
6, shearing self-balancing original position direct shear apparatus provided by the invention, eliminates the movement of staight scissors soil sample in process of the test, it is to avoid the disturbance to staight scissors soil sample, improves the accuracy measuring parameter.
Accompanying drawing explanation
Fig. 1: the structural representation of shearing self-balancing original position direct shear apparatus provided by the invention；
Fig. 2: the sectional structure schematic diagram of shearing self-balancing original position direct shear apparatus provided by the invention；
Fig. 3: the structural representation of jack provided by the invention；
Fig. 4: the schematic diagram of shearing self-balancing original position direct shear apparatus test procedure one provided by the invention；
Fig. 5: the schematic diagram of shearing self-balancing original position direct shear apparatus test procedure two provided by the invention；
Fig. 6: the schematic diagram of shearing self-balancing original position direct shear apparatus test procedure three provided by the invention；
Fig. 7: the schematic diagram of shearing self-balancing original position direct shear apparatus test procedure four provided by the invention；
Fig. 8: the schematic diagram of shearing self-balancing original position direct shear apparatus test procedure five provided by the invention；
Fig. 9: the schematic diagram of shearing self-balancing original position direct shear apparatus test procedure six provided by the invention；
Wherein: 1, upper direct shear box；2, elbow；3, lower direct shear box；4, compensating groove；5, sidewise restraint plate；6, displacement transducer；7, pressure transducer；8, jack；9, staight scissors soil sample；81, push rod；82, oil filler point；83, pressure controller.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The shearing self-balancing original position direct shear apparatus that the embodiment of the present invention provides, for measuring the shear parameters of the original position Rock And Soil being positioned at transmission line tower foundation ground place, and then determine the bearing capacity of transmission line tower foundation and ground, as shown in Figures 1 to 3, including upper direct shear box 1, elbow 2, lower direct shear box 3, compensating groove 4, sidewise restraint plate 5, displacement transducer 6, pressure transducer 7, jack 8, push rod 81, oil filler point 82, pressure controller 83.Upper direct shear box 1 and lower direct shear box 3 are hexahedron, its relative two sides opening, and upper direct shear box 1 is vertically arranged with lower direct shear box 3 and opening is corresponding, its Inner Constitution cuboid cavity；The side of lower direct shear box 3 is horizontally disposed with highly lower slightly compensating groove 4, and jack 8 is horizontally set in compensating groove 4；One end of jack 8 is connected with upper direct shear box 1 by elbow 2, and the other end is connected with the upright side walls of compensating groove 4.Pressure transducer 7 is set between jack 8 and elbow 2.
Wherein, the angle that curves of elbow 2 is 90 °, and orthogonal two end faces are flexibly connected with upper direct shear box 1 and compensating groove 4 respectively, is made the shear surface between axis and upper shear box 1 and the down cut box 3 of the axis of jack 8, pressure transducer 7 coplanar by elbow 2.
Along the upper direct shear box 1 of jack 8 direction of motion and the identical sidewall of lower direct shear box 3, displacement transducer 6 is set, displacement transducer 6 includes base and probe, base is arranged on lower direct shear box 3 sidewall, probe is arranged on direct shear box 1 sidewall, and thus namely displacement transducer 6 records the relative displacement of direct shear box 1 and lower direct shear box 3.
It is respectively separated is symmetrical arranged sidewise restraint plate 5 along the upper direct shear box 1 of jack 8 direction of motion and the intersection, two side of lower direct shear box 3.Sidewise restraint plate 5 constrains and horizontally rotates degree of freedom between direct shear box 1 and lower direct shear box 3, by the axis of the axis of elbow 2 adjustable jack 8 and pressure transducer 7 with imagination shear surface coplanar, sidewise restraint plate 5 and in elbow 2 common guarantee direct shear box 1 and lower direct shear box 3 only there is the relative translational movement along jack 8 axis direction.
Wherein, jack 8 includes push rod 81, oil filler point 82 and pressure controller 83；Push rod 81 is connected with pressure transducer 7 and does rectilinear motion along the axis direction of jack 8.Jack 8 is the power set of shearing self-balancing original position direct shear apparatus, exerted oneself by it and promote upper direct shear box 1 to be subjected to displacement, counter-force is then transferred to lower direct shear box 3 by compensating groove 4, and upper direct shear box 1 is equal, in opposite direction with the amount of force of lower direct shear box 3, it is achieved the self-balancing of horizontal shear；The size of exerting oneself of jack 8 is then measured by pressure transducer 7.
The shearing self-balancing original position direct shear apparatus that the present embodiment provides, have employed double-shear box, and take the structure of regulatable shear surface, horizontal addload structure is optimized, realize the self-balancing of horizontal addload, reduce the working space of horizontal addload, eliminate shifting sample process, it is to avoid disturbance to staight scissors soil sample.
Present invention also offers a kind of in-situ direct shear test method of shearing self-balancing original position direct shear apparatus, if Fig. 4 is to shown in 9, step is as follows:
1, staight scissors soil sample 9 is excavated；As shown in Figure 4, according to the inner chamber size that upper direct shear box 1 is constituted with lower direct shear box 3, excavated by manual work excavates the staight scissors soil sample 9 meeting demand.
2, lower direct shear box 3 is installed；As it is shown in figure 5, after treating staight scissors soil sample 9 finishing, first install lower direct shear box 3, staight scissors soil sample 9 be placed in lower direct shear box 3 inner chamber, should avoid staight scissors soil sample 9 is produced disturbance in installation process.
3, direct shear box 1 is installed；As shown in Figure 6, by staight scissors soil sample 9 through upper direct shear box inner chamber 1, and make direct shear box 1 and lower direct shear box 3 vertical non-alignment, without clear gap, installation process should be avoided staight scissors soil sample 9 is produced disturbance.
4, jack 8, pressure transducer 7 and displacement transducer 6 are installed；As it is shown in fig. 7, pressure transducer 7 and jack 8 are positioned in compensating groove 4, and the shear surface between pressure transducer 7, jack 8, upper shear box 1 and down cut box 3 is adjusted to coaxial.The base of displacement transducer 6 is positioned at lower direct shear box 3, and displacement transducer 6 probe is positioned at direct shear box 1, and thus namely displacement transducer 6 records the relative displacement of direct shear box 1 and lower direct shear box 3.
5, in-situ direct shear test is carried out；As shown in Figure 8, applying horizontal shear step by step by jack 8, after pressure transducer 7 and displacement transducer 6 indicating value are stable, record jack 8 is exerted oneself the relative displacement with down cut box 3 of size and upper shear box 1 respectively, until off-test.Before direct shear test starts, answer the less horizontal force of pre-add one, to eliminate the gap between upper direct shear box 1, lower direct shear box 3 and staight scissors soil sample 9, after pressure transducer 7 and displacement transducer 6 indicating value are stable, make the two make zero.
6, in-situ direct shear test is terminated；As it is shown in figure 9, reach after unloading standard until in-situ direct shear test, by the reverse dismounting assay device of step 1 to 5, terminate in-situ direct shear test.
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit; those of ordinary skill in the field are to be understood that; the specific embodiment of the present invention can being modified with reference to above-described embodiment or equivalent replacement, these are all being applied within the claims awaited the reply without departing from any amendment or equivalent replacement of spirit and scope of the invention.
Claims (10)
1. a shearing self-balancing original position direct shear apparatus, it is characterised in that: described original position direct shear apparatus includes direct shear box (1), lower direct shear box (3), compensating groove (4) and jack (8)；Described upper direct shear box (1) and lower direct shear box (3) are hexahedron, its relative two sides opening, the described upper direct shear box (1) being vertically arranged is corresponding with the opening of lower direct shear box (3), its Inner Constitution cuboid cavity；The side of described lower direct shear box (3) is horizontally disposed with compensating groove (4), and described jack (8) is horizontally set in compensating groove (4)；One end of described jack (8) is connected with upper direct shear box (1), and the other end is connected with the upright side walls of compensating groove (4).
2. shearing self-balancing original position direct shear apparatus as claimed in claim 1, it is characterized in that, described lower direct shear box (3), higher than compensating groove (4), sets gradually elbow (2) and pressure transducer (7) between described upper direct shear box (1) and jack (8).
3. shearing self-balancing original position direct shear apparatus as claimed in claim 2, it is characterised in that the angle that curves of described elbow (2) is 90 °, and orthogonal two end faces are connected with upper direct shear box (1) and compensating groove (4) respectively.
4. shearing self-balancing original position direct shear apparatus as claimed in claim 3, it is characterized in that, made by described elbow (2) shear surface between axis and upper shear box (1) and the down cut box (3) of the axis of jack (8), pressure transducer (7) coplanar.
5. shearing self-balancing original position direct shear apparatus as claimed in claim 1, it is characterized in that, displacement transducer (6) is set along the upper direct shear box (1) of described jack (8) direction of motion and the identical sidewall of lower direct shear box (3).
6. shearing self-balancing original position direct shear apparatus as claimed in claim 5, it is characterized in that, institute's displacement sensors (6) includes base and probe, and described base is arranged on lower direct shear box (3) sidewall, and described probe is arranged on direct shear box (1) sidewall.
7. shearing self-balancing original position direct shear apparatus as claimed in claim 1, it is characterized in that, be respectively equipped with sidewise restraint plate (5) along the upper direct shear box (1) of described jack (8) direction of motion and the intersection, two side of lower direct shear box (3).
8. shearing self-balancing original position direct shear apparatus as claimed in claim 7, it is characterised in that described sidewise restraint plate (5) interval is symmetricly set on direct shear box (1) and the intersection, two side of lower direct shear box (3).
9. shearing self-balancing original position direct shear apparatus as claimed in claim 2, it is characterised in that described jack (8) includes push rod (81), oil filler point (82) and pressure controller (83)；Described push rod (81) is connected with pressure transducer (7) and does rectilinear motion along the axis direction of jack (8).
10. the shearing self-balancing original position direct shear apparatus as described in any claim in claim 1～9, it is characterized in that, the staight scissors soil sample (9) being positioned at the original position Rock And Soil at transmission line tower foundation ground place is arranged on the cuboid cavity that described upper direct shear box (1) is constituted with lower direct shear box (3), and the volume of described staight scissors soil sample (9) and described cavity volume match.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410767366.1A CN105758736A (en) | 2014-12-11 | 2014-12-11 | In-situ direct shear device with self-balanced shear forces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410767366.1A CN105758736A (en) | 2014-12-11 | 2014-12-11 | In-situ direct shear device with self-balanced shear forces |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105758736A true CN105758736A (en) | 2016-07-13 |
Family
ID=56336051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410767366.1A Pending CN105758736A (en) | 2014-12-11 | 2014-12-11 | In-situ direct shear device with self-balanced shear forces |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105758736A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108362577A (en) * | 2018-01-26 | 2018-08-03 | 中国电力科学研究院有限公司 | A kind of original position direct shear apparatus and its detection method |
| CN108801770A (en) * | 2018-06-27 | 2018-11-13 | 西安科技大学 | A kind of simple direct shear apparatus of large size |
| CN109406303A (en) * | 2019-01-09 | 2019-03-01 | 福州大学 | Orient the large-scale indoor direct shear apparatus of self-balancing type and its working method of low friction |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2151798A (en) * | 1983-12-16 | 1985-07-24 | Schenck Ag Carl | Testing the shearing strength of jointed test pieces |
| JPH0821789A (en) * | 1994-07-08 | 1996-01-23 | Fujita Corp | Apparatus for testing shearing of one face |
| CN201159709Y (en) * | 2008-02-29 | 2008-12-03 | 中国水利水电第三工程局 | Shearing force box for concrete shear test |
| CN102135475A (en) * | 2010-08-04 | 2011-07-27 | 中国海洋大学 | Direct-cutting antiskid structure model tester |
| CN202083599U (en) * | 2011-06-14 | 2011-12-21 | 黄河勘测规划设计有限公司 | Soil in-situ test split shear box |
-
2014
- 2014-12-11 CN CN201410767366.1A patent/CN105758736A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2151798A (en) * | 1983-12-16 | 1985-07-24 | Schenck Ag Carl | Testing the shearing strength of jointed test pieces |
| JPH0821789A (en) * | 1994-07-08 | 1996-01-23 | Fujita Corp | Apparatus for testing shearing of one face |
| CN201159709Y (en) * | 2008-02-29 | 2008-12-03 | 中国水利水电第三工程局 | Shearing force box for concrete shear test |
| CN102135475A (en) * | 2010-08-04 | 2011-07-27 | 中国海洋大学 | Direct-cutting antiskid structure model tester |
| CN202083599U (en) * | 2011-06-14 | 2011-12-21 | 黄河勘测规划设计有限公司 | Soil in-situ test split shear box |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108362577A (en) * | 2018-01-26 | 2018-08-03 | 中国电力科学研究院有限公司 | A kind of original position direct shear apparatus and its detection method |
| CN108801770A (en) * | 2018-06-27 | 2018-11-13 | 西安科技大学 | A kind of simple direct shear apparatus of large size |
| CN109406303A (en) * | 2019-01-09 | 2019-03-01 | 福州大学 | Orient the large-scale indoor direct shear apparatus of self-balancing type and its working method of low friction |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3872717A (en) | Soil testing method and apparatus | |
| CN103149101B (en) | Multifunctional triaxial creep testing machine with soil body pulling, pressing, twisting and shearing functions | |
| WO2020133729A1 (en) | Method and system for in-situ test of mechanical behaviors and seepage characteristics of coal rock mass under influence of real mining induced stress | |
| Brosse et al. | The undrained shear strength anisotropy of four Jurassic to Eocene stiff clays | |
| CN107882011B (en) | miniature probe with temperature compensation function | |
| Zhang et al. | Development of a combined VHM loading apparatus for a geotechnical drum centrifuge | |
| CN105758736A (en) | In-situ direct shear device with self-balanced shear forces | |
| CN103267617B (en) | Shield structure Butt sealing performance test apparatus | |
| CN112067481B (en) | Intelligent geotechnical mechanical parameter testing system | |
| AU2017425530B2 (en) | Free fall ball penetrometer with a booster | |
| CN105890947A (en) | Device and method for preparation of soil body for site soil body direct shear test and direct shear test | |
| Feng et al. | Experimental method for direct shear tests of hard rock under both normal stress and lateral stress | |
| CN110426289A (en) | The experimental rig and method that hole wall loads under the conditions of a kind of simulation in-situ stress | |
| CN106052921A (en) | Filling retaining wall stress change rule simulation test device and test method | |
| CN105606202A (en) | High-precision ultralow frequency six-dimensional force micro-vibration measuring system | |
| CN109030242B (en) | Electromagnetic power rock direct shear apparatus and operation method | |
| CN114910367A (en) | Indoor static sounding and bending element combined test system suitable for soil body size strain measurement | |
| CN114324010A (en) | Rock mass structural plane multidirectional dynamic shear mechanics testing system based on vibration table principle | |
| CN207197938U (en) | The displacement loading three dimensional taest device of shield driving face stability analysis | |
| CN104567771A (en) | Vertical-displacement measurement device for unconfined oil and gas pipeline in transverse motion process | |
| Kung | Equipment and testing procedures for small strain triaxial tests | |
| CN105043611A (en) | In-situ testing device for lateral expansive force of expansive soil | |
| CN207300760U (en) | A kind of large-scale triaxial shear test device in situ | |
| CN109540572A (en) | Coal mine filling artificial intelligence experimental rig | |
| Talesnick et al. | Development of a soil boundary friction meter: application to scale model testing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160713 |