CN107907098A - Complexes and its implementation for the test of soil body three dimensional strain - Google Patents
Complexes and its implementation for the test of soil body three dimensional strain Download PDFInfo
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- CN107907098A CN107907098A CN201711435186.3A CN201711435186A CN107907098A CN 107907098 A CN107907098 A CN 107907098A CN 201711435186 A CN201711435186 A CN 201711435186A CN 107907098 A CN107907098 A CN 107907098A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
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Abstract
The present invention provides a kind of complexes for the test of soil body three dimensional strain, including three dimensional strain flower, data conductor, the rod-shaped apparatus for placing of cylinder.A kind of implementation of the complete set of equipments for the test of soil body three dimensional strain is provided at the same time.The beneficial effects of the invention are as follows that three dimensional strain soil block can be put into tested point with intrinsic angle and depth, the accuracy of test result is improved, has not replaceable effect for the stability after analytical soil sample stress and evaluation engineering safe class.By practical measurement and compare, this class device can improve the 79%~85% of three dimensional strain device to test precision.Therefore the implementation has highly important realistic meaning and engineering application value.
Description
Technical field
The invention belongs in the soil body in geotechnical engineering strain testing field it is a kind of for the soil body three dimensional strain test into
Covering device and its implementation, available in foundation pit side-wall in detection base pit engineering and the deformation of Foundation Pit bottom, and the test soil body
Certain point is deformed as caused by additional stress.
Background technology
The soil body external loads change in the case of, the relative position relation of inside soil body can also change, usually I
The change of this relative position is referred to as to strain.The strain measurement of the soil body is a basic work in engineering, for
The deformation characteristics of analytical soil sample are calculated, the safe class of soil body engineering is assessed, there is highly important effect.Soil deformation for
Engineering structure stability has strong influence, such as：Soil body penetration deforms the influence for dam construction security, bank slope soil
Body deforms influence for port and pier, influence that the load situation on top is excavated for subterranean tunnel etc..Therefore, the soil body is measured
General strain regime and principal strain, shearing strain etc., the defence for engineering project disaster is of great practical significance.
Patent 201410740140.2, patent 201610917550.9 and patent 201610964552.3 disclose a kind of use
In the device and test method of test inside soil body three dimensional strain state.Found in specific implementation process, what which provided
Test device and method can not determine the depth of burying and angle of three dimensional strain device, so as to cannot get the strain of soil body reality.
Meanwhile the embedded angles and positions of three dimensional strain device are closely related with its computational accuracy, therefore it is badly in need of a kind of being used for the soil body three
The complexes and its implementation of strain testing are tieed up, are conducive to for realizing that three dimensional strain flower is played in the application of the original state soil body
Important effect.
The content of the invention
It is an object of the present invention to provide a kind of complexes and its implementation for the test of soil body three dimensional strain, Neng Gouyong
In the complete use of soil body three dimensional strain test, the device is easy to operate, can effectively test the advantage of the strain of the soil body.
To achieve these goals, the present invention provides a kind of complexes for the test of soil body three dimensional strain, wherein：Should
Device includes：Three dimensional strain flower, data conductor, strain rosette make box, guide rod.
A kind of implementation of the complexes for the test of soil body three dimensional strain is provided at the same time.
The present invention solves the deficiency that three-dimensional soil body strain detection testing device is difficult to apply in undisturbed soil, is strained by the soil body
The complexes and its implementation of test test out the strain of the soil body, for the stability after analytical soil sample stress and evaluation work
Journey safe class has not replaceable effect.By practical measurement and compare, this class device can improve three dimensional strain device
The 79%~85% of measuring accuracy.Therefore, the embodiment party of a kind of complexes for the test of soil body three dimensional strain of the invention
Method has highly important realistic meaning and engineering application value.
Brief description of the drawings
Fig. 1 strain rosettes of the present invention make box schematic diagram；
Fig. 2 three dimensional strain soil block schematic diagrames of the present invention；
The apparatus for placing chuck structure schematic diagram of Fig. 3 present invention；
The outer barrel and an external barrel cap structure schematic diagram of the apparatus for placing of Fig. 4 present invention；
The apparatus for placing interior bar and nut structure schematic diagram of Fig. 5 present invention；
The apparatus for placing structure diagram of Fig. 6 present invention；
Fig. 7 present invention's places three dimensional strain soil block front view using apparatus for placing；
Fig. 8 present invention's places three dimensional strain soil block top view using apparatus for placing.
In figure：
1. three dimensional strain spends 2. data conductor, 3. strain rosette to make 4. guide rod of box
5. 41. collet of three dimensional strain soil block, 42. interior bar, 43. outer barrel
44. 45. nut of outer barrel cap, 46. screw thread, 47. thread groove
411. spring, 441. circular hole
Embodiment
The complexes for being used for the test of soil body three dimensional strain and its implementation of the present invention are illustrated with reference to attached drawing.
The design philosophy of the present invention is how three dimensional strain flower to be put into test point with defined test angle, and keeps three
Tie up the shape invariance of strain rosette.The easily controlled thinking of precision is made based on small sample, spends 1 to insert strain rosette three dimensional strain
Make in box 3, strain rosette is made into box 3 with the soil body and three dimensional strain spends the gap filling between 1 closely knit, that is, forms three dimensional strain
Soil block 5, as shown in Figure 2.Three dimensional strain soil block 5 is put into test point with apparatus for placing again.
For this reason, the complexes structure for being used for the test of soil body three dimensional strain of the present invention is that the complexes are adopted with strain
Header is connected, which includes test device, apparatus for placing, and the test device spends 1, data including three dimensional strain
Conducting wire 2, strain rosette make box 3, and it is the uncovered pros shape that length, width and height are 15cm that the strain rosette, which makes box 3, three-dimensional
Strain rosette 1 inserts strain rosette and makes in box 3, makes box 3 in strain rosette and three dimensional strain spends the gap between 1 to fill the soil body, i.e.,
A three dimensional strain soil block 5 is formed, three dimensional strain spends 1 more strain bar conducting wires to collect for a single data conducting wire 2, data conductor
2 are connected with the connector of the strain acquirement case, constitute test device；Guide rod 4 is apparatus for placing；The collet 41 of guide rod 4 presss from both sides
Firmly three dimensional strain soil block 5 forms complexes.As shown in Figure 1.
Spend 1 to insert strain rosette three dimensional strain to make in box 3, with the soil body by strain rosette make box 3 and three dimensional strain spend 1 it
Between gap filling it is closely knit, that is, form three dimensional strain soil block 5, data conductor 2 is connected with three dimensional strain soil block 5, as shown in Figure 2.
The guide rod 4 includes：Collet 41, interior bar 42, outer barrel 43, outer barrel cap 44, nut 45 form, as shown in Figure 6.Interior bar 42 it is upper
End is provided with screw thread 46, and the lower end of interior bar 42 is provided with thread groove 47, as shown in Figure 5.The upper end of outer barrel 43 is provided with screw thread 46,
The lower end of outer barrel 43 is provided with thread groove 47, and the outer barrel cap 44 is provided with thread groove 47 for hat shape and inner wall, outer barrel cap 44
Roof fall is provided with circular hole 441, as shown in Figure 4.41 upper end of collet is provided with screw thread 46, and the junction of collet 41 is equipped with bullet
Spring 411, as shown in Figure 3.The screw thread 46 of 43 upper end of outer barrel is connected with the thread groove 47 of outer barrel cap 44, by 41 tail end of collet
Screw thread 46 is connected with the thread groove 47 of 42 lower end of interior bar, and 42 upper end of interior bar is passed through to the circular hole 441 of outer barrel 43 and outer barrel cap 44,
And be connected nut 45 with 42 upper end of interior bar, that is, guide rod 4 is formed, as shown in Figure 6.
Spend 1 to insert strain rosette three dimensional strain to make in box 3, the sky between 1 is spent in strain rosette making box 3 and three dimensional strain
Gap fills the soil body, that is, forms a three dimensional strain soil block 5；Three dimensional strain spends 1 more strain bar conducting wires to collect for a single data
Conducting wire 2, data conductor 2 are connected with the connector of the strain acquirement case, constitute test device；Guide rod 4 is assembled again, is constituted and is put
Put device；Three dimensional strain soil block 5 is put into tested point with guide rod 4 again, is constituted for the test of soil body three dimensional strain into suit
Put.
The implementation of the complexes for being used for the test of soil body three dimensional strain of the present invention, the implementation include following step
Suddenly：
1) three dimensional strain soil block 5 is prepared, the more strain bar conducting wires that three dimensional strain spends 1 are collected for a single data conducting wire 2,
As shown in Figure 2.
2) drill in place to be measured, be to be put into three dimensional strain soil block 5 in following step to prepare.
3) guide rod 4 is assembled, as shown in Figure 6.
4) step 1) is clamped by the collet 41 of guide rod 4 and prepares the three dimensional strain soil block 5 formed, then pass through rotary nut 45
Three dimensional strain soil block 5 is clamped, prevents three dimensional strain soil block 5 from coming off in placement process, as shown in Figure 7,8.
5) the three dimensional strain soil block 5 for clamping the guide rod 4 described in step 4) is sent into the drilling of step 2), passes through rotary nut
45 unclamp collet 41, three dimensional strain soil block 5 is disconnected with collet 41, reach three dimensional strain soil block 5 being put into tested point
Purpose, data conductor 2 is exported from drilling and is connected with strain acquirement case, is then filled surrounding hole with the soil body closely knit.
6) deformation that the tested point soil body produces drives three dimensional strain to spend 1 deformation, and the reading collected by strain acquirement case,
ε is denoted as respectively1、ε2、ε3、ε4、ε5、ε6, it is as follows by the three dimensional strain state of formula (1) the calculating soil body, formula (1)：
In formula：ε1、ε2、ε3、ε4、ε5、ε6Three dimensional strain, which is obtained, for strain acquirement case spends reading on 16 strain bar directions
Number；εx、εy、εz、εxy、εyz、εzxX-axis direction strains respectively in the soil body；Y-axis direction strains；Z-axis direction strains；Xoy is cut on face
Stress direction strains；Shear stress direction strains on yoz faces；Shear stress direction strains on xoz faces.
1 is spent to be fixed in three dimensional strain soil block 5 three dimensional strain, three dimensional strain spends 1 each strain bar and x-axis, y in space
The direction cosines l of axis, z-axisi、mi、ni(i=1,2,3,4,5,6) is respectively：
ni=cos δi (4)
In formula, δi1 each strain bar is spent to project the angle with x-axis in xoy for three dimensional strain,1 is spent respectively should for three dimensional strain
Become bar and the angle (i=1,2,3,4,5,6) of z-axis.The matrix operator T being made of direction cosines l, m, n-1, it is as follows：
By three dimensional strain soil block 5 it is parallel be put into tested point after, three dimensional strain spend 1 in the locus of tested point still etc.
The locus being same as in three dimensional strain soil block 5, thus by three dimensional strain spend 1 be placed in three dimensional strain soil block 5 can effectively really
Determine three dimensional strain and spend 1 embedded angle and burial place in three dimensions.When three dimensional strain spends 1 locus to become
Change, i.e. δi,Change, matrix operator T-1Also can change, from formula (1), { ε calculatedx、εy、εz、εxy、εyz、
εzxChange, cause test result inaccurate.
Claims (2)
1. a kind of complexes for the test of soil body three dimensional strain, which is connected with strain acquirement case, its feature
It is：The complexes include test device, apparatus for placing, and the test device includes three dimensional strain flower (1), data conductor
(2), strain rosette makes box (3), and it is uncovered pros shape that length, width and height are 15cm that the strain rosette, which makes box (3), and three
Dimension strain rosette (1) inserts strain rosette and makes in box (3), and making the gap between box (3) and three dimensional strain flower (1) in strain rosette fills out
The soil body is filled, that is, forms a three dimensional strain soil block (5), more strain bar conducting wires of three dimensional strain flower (1) collect for a single data
Conducting wire (2), data conductor (2) are connected with the connector of the strain acquirement case, constitute test device；Guide rod (4) is to place
Device；The collet (41) of guide rod (4) clamps three dimensional strain soil block (5) and forms complexes.
The guide rod (4) includes collet (41), interior bar (42), outer barrel (43), outer barrel cap (44), nut (45), interior bar (42)
Upper end be provided with screw thread (46), the lower end of interior bar (42) is provided with thread groove (47), and the upper end of outer barrel (43) is provided with screw thread
(46), the lower end of outer barrel (43) is provided with thread groove (47), and the outer barrel cap (44) is provided with thread groove for hat shape and inner wall
(47), the roof fall of outer barrel cap (44) is provided with circular hole (441), and collet (41) upper end is provided with screw thread (46), and collet
(41) junction is equipped with spring (411), by thread groove (47) phase of the screw thread (46) of outer barrel (43) upper end and outer barrel cap (44)
Connection, the screw thread (46) of collet (41) tail end is connected with the thread groove (47) of interior bar (42) lower end, by interior bar (42) upper end
It is connected through outer barrel (43) and the circular hole (441) of outer barrel cap (44), and by nut (45) with interior bar (42) upper end, that is, forms guide rod
(4)。
2. utilize the implementation of the complexes for being used for the test of soil body three dimensional strain described in claim 1, the implementation
Comprise the following steps：
1) the three dimensional strain soil block (5) described in claim 1 is prepared, the more strain bar conducting wires that three dimensional strain spends (1) are collected
For a single data conducting wire (2)；
2) drill in place to be measured, be to be put into three dimensional strain soil block (5) in following step to be ready；
3) guide rod (4) is assembled；
4) step 1) is clamped by the collet (41) of guide rod (4) and prepares the three dimensional strain soil block (5) formed, then pass through rotary nut
(45) three dimensional strain soil block (5) is clamped, prevents three dimensional strain soil block (5) from coming off in placement process；
5) the three dimensional strain soil block (5) for clamping the guide rod (4) described in step 4) is sent into the drilling of step 2), passes through rotary nut
(45) collet (41) is unclamped, three dimensional strain soil block (5) is disconnected with collet (41), three dimensional strain soil block (5) is put into and is treated
Measuring point, data conductor (2) is exported from drilling and is connected with the connector of strain acquirement case, is then filled out hole around with the soil body
Fill closely knit；
6) deformation that the tested point soil body produces drives three dimensional strain flower (1) deformation, and the reading collected by strain acquirement case, point
ε is not denoted as it1、ε2、ε3、ε4、ε5、ε6, it is as follows by the three dimensional strain state of formula (1) the calculating soil body, formula (1)：
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In formula：ε1、ε2、ε3、ε4、ε5、ε6The reading on 6 strain bar directions of (1) is spent for strain acquirement case；εx、εy、εz、
εxy、εyz、εzxX-axis direction strains respectively in the soil body；Y-axis direction strains；Z-axis direction strains；Shear stress direction should on xoy faces
Become；Shear stress direction strains on yoz faces；Shear stress direction strains on x oz faces；
By three dimensional strain soil block 5 it is parallel be put into tested point after, three dimensional strain spends 1 to be still equal in the locus of tested point
Locus in three dimensional strain soil block 5, therefore three can effectively be determined by spending 1 to be placed in three dimensional strain soil block 5 three dimensional strain
Tie up the embedded angle in three dimensions of strain rosette 1 and burial place.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110411804A (en) * | 2019-09-02 | 2019-11-05 | 上海交通大学 | A kind of contact face mechanical property test sample, preparation method and the test method of the soil body and structure |
| CN112325735A (en) * | 2020-11-05 | 2021-02-05 | 吉林大学 | Visual measuring device and method for three-dimensional space distribution of seedbed soil blocks |
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| 李顺群: "一种三维土压力盒的工作原理及其应用" * |
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| CN110411804A (en) * | 2019-09-02 | 2019-11-05 | 上海交通大学 | A kind of contact face mechanical property test sample, preparation method and the test method of the soil body and structure |
| CN110411804B (en) * | 2019-09-02 | 2024-04-16 | 上海交通大学 | Test sample for mechanical properties of contact surface of soil body and structure, preparation method and test method |
| CN112325735A (en) * | 2020-11-05 | 2021-02-05 | 吉林大学 | Visual measuring device and method for three-dimensional space distribution of seedbed soil blocks |
| CN112325735B (en) * | 2020-11-05 | 2021-08-03 | 吉林大学 | Visual measuring device and method for three-dimensional space distribution of seedbed soil blocks |
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