CN103616301A - Soil body shearing testing device and soil body shearing method - Google Patents
Soil body shearing testing device and soil body shearing method Download PDFInfo
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- CN103616301A CN103616301A CN201310686386.1A CN201310686386A CN103616301A CN 103616301 A CN103616301 A CN 103616301A CN 201310686386 A CN201310686386 A CN 201310686386A CN 103616301 A CN103616301 A CN 103616301A
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- soil body
- soil
- shearing
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Abstract
The invention discloses a soil body shearing testing device. The soil body shearing testing device comprises a special cutting ring, a pressurizing system and a mini-type injection instrument. The shearing testing device is characterized in that a plurality of side holes are formed in the periphery of the special cutting ring; the pressurizing system is composed of a pressurizing top cover, a lever and a weight; the mini-type injection instrument is provided with a conical probe, a reading window and the like. The invention discloses a soil body shearing testing method. According to the brand-new shearing testing device and shearing testing method for determining the shearing strength index of the soil body, the device is simple and convenient to operate; the shearing strength index of the soil body can be determined by only using one test sample and the uniformity of the test sample is guaranteed; the time for injecting the soil body by virtue of the mini-type injection instrument is short and the test sample can be controlled well to discharge water; all the characteristics are good for the accuracy of testing results; the soil body shearing testing device and the soil body shearing testing method are suitable for various civil engineering construction fields.
Description
Technical field
The invention belongs to field of civil engineering, specifically a kind of soil body shearing test device and test method.
Background technology
In civil engineering construction, determine that a lot of fields such as foundation bearing capacity, calculating Earth Pressure on Retaining Wall, checking computations Stability of Earth Slopes all need to use soil strength (cohesion
c,
angle of internal friction
j),
soil strength is to obtain by shear test, and existing shearing test method comprises direct shear test, triaxial shear test.Direct shear test has limited in shear surface position, shear history that shearing stress distribution is inhomogeneous artificially, shear area all do not give when reducing gradually but calculating consideration, shear time length cannot control preferably draining; The triaxial apparatus that triaxial shear test Instrument structure is complicated, price is high, operative technique requirement is high and conventional is not true triaxil tester truly, but false triaxial apparatus (intermediate principal stress is identical with minor principal stress). above-mentioned two kinds of tests must be used four samples to test, and are difficult to guarantee the consistance of sample and the accuracy of test result.
Summary of the invention
In order to solve the above-mentioned technical matters existing in prior art, the invention provides a kind of soil body shearing test device, comprise special-purpose cutting ring, compression system and miniature penetrometer, it is characterized in that: described special-purpose cutting ring surrounding has a plurality of side openings, described compression system is comprised of the top cover that pressurizes, lever and counterweight, and described miniature penetrometer has circular cone probe and reading window.
Further, as preferably, described special-purpose cutting ring has four side openings, spacing 90
o.
The present invention also provides a kind of soil body shearing test method, comprises the following steps:
Step 1, use special-purpose cutting ring to cut the soil body to make sample;
Step 2, by pressurization top cover, lever and counterweight, at sample end face, sample is applied to first order normal stress s
1;
Step 3, at normal stress s
1under effect, by the circular cone of miniature penetrometer slowly injection the first soil body 1cm of side opening place that pops one's head in, record miniature penetrometer reading F
1;
Step 4, repeating step two, three, continue sample to apply step by step normal stress s
2, s
3, s
4, and by miniature penetrometer at the second side opening, the 3rd side opening, the 4th side opening successively the injection soil body, record miniature penetrometer reading F
2, F
3, F
4;
Step 5, according to miniature penetrometer reading F, by formula (1), calculate soil shear strength τ
f:
τ
f =0.512F-0.09 （1）
Obtain four shearing strength values, postscript corresponding to normal stress is (s
1, τ
f1), (s
2, τ
f2), (s
3, τ
f3), (s
4, τ
f4);
Further, also can at sample end face, to sample, apply normal stress by other compression systems.
The invention provides shearing test device and the test method of brand-new mensuration soil strength, device is simple
,easy to operate
,sample homogeneous
,test duration is short, and the accuracy of test result easily guarantees, is applicable to various civil engineering construction occasions and uses.
Accompanying drawing explanation
Fig. 1 is the structural representation of soil body shearing test device of the present invention;
Fig. 2 is the structural representation of miniature penetrometer;
Fig. 3 is the schematic diagram that normal stress, soil shear strength are derived cohesion and angle of internal friction.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As illustrated in fig. 1 and 2, soil body shearing test device of the present invention, comprises special-purpose cutting ring 1, compression system and miniature penetrometer, and special-purpose cutting ring 1 surrounding has a plurality of side opening 2(depending on testing requirements), such as four side openings 2, spacing 90
o, compression system is comprised of the top cover 3 that pressurizes, lever 4 and counterweight 5, and miniature penetrometer has circular cone probe 6 and reading window 7.
Soil body shearing test method principle of the present invention is as follows: use special-purpose cutting ring to cut the soil body and make sample, at specimen surface, apply normal stress s, then at special-purpose cutting ring side opening, use miniature penetrometer injection sample, obtain penetration resistance, by experimental formula, penetration resistance can be converted into soil shear strength, according to normal stress and shearing strength, can calculate soil strength (cohesion c, angle of internal friction j).
Soil body shear test of the present invention comprises the steps:
1, use special-purpose cutting ring 1 to cut the soil body and make sample;
2, by pressurization top cover 3, lever 4 and counterweight 5, at sample end face, sample is applied to first order normal stress s
1;
3, at normal stress s
1under effect, by the circular cone of miniature penetrometer 6 injection side opening 2 soil body 1cm of place that pop one's head in, record miniature penetrometer reading (being penetration resistance) F
1;
4, the method for operating of repeating step 2,3, continues sample to apply step by step normal stress s
2, s
3, s
4, and by miniature penetrometer at side opening 2, side opening 3, side opening 4 successively the injection soil body, record miniature penetrometer reading F
2, F
3, F
4;
5,, according to miniature penetrometer reading F, by formula (1), calculate soil shear strength τ
f:
τ
f =0.512F-0.09 （1）
Obtain four shearing strength values, postscript corresponding to normal stress is (s
1, τ
f1), (s
2, τ
f2), (s
3, τ
f3), (s
4, τ
f4);
6, normal stress s is horizontal ordinate, soil shear strength τ
ffor ordinate, set up rectangular coordinate system, (the s that step 5 is obtained
i, τ
fi) in coordinate system, find corresponding point, four points are drawn a straight line, the intercept of straight line and axis of ordinates is soil strength-cohesion c; The angle of straight line and abscissa axis is soil strength-angle of internal friction j, as shown in Figure 3.
Test case:
Use this test unit to test a undisturbed soil sample, at sample end face, apply respectively 25kp
a, 50 kp
a, 100 kp
a, 200kp
anormal stress, 1cm in the injection soil of at four side openings, miniature penetrometer circular cone being popped one's head in respectively slowly, recording miniature penetrometer reading is 33,45,67,112, by formula (1), being converted into soil shear strength is 16.9 kp
a, 23.0 kp
a, 34.3 kp
a, 57.3 kp
a, by normal stress and shearing strength, in rectangular coordinate system, determine four points, be linked to be and look survey straight line, the intercept of straight line and axis of ordinates is soil strength-cohesion c=11 kp
a; The angle of straight line and abscissa axis is soil strength-angle of internal friction j=12.9
o.
Claims (4)
1. a soil body shearing test device, comprise special-purpose cutting ring (1), compression system and miniature penetrometer, it is characterized in that: described special-purpose cutting ring (1) surrounding has a plurality of side openings (2), described compression system is comprised of the top cover that pressurizes (3), lever (4) and counterweight (5), and described miniature penetrometer has circular cone probe (6) and reading window (7).
2. soil body shearing test device as claimed in claim 1, is characterized in that: described special-purpose cutting ring (1) has four side openings (2), spacing 90
o.
3. a soil body shearing test method, comprises the steps:
Step 1, use special-purpose cutting ring (1) to cut the soil body to make sample;
Step 2, by pressurization top cover (3), lever (4) and counterweight (5), at sample end face, sample is applied to first order normal stress s
1;
Step 3, at normal stress s
1under effect, by the circular cone probe (6) of miniature penetrometer injection first soil body 1cm of side opening place slowly, record miniature penetrometer reading F
1;
Step 4, repeating step two, three, continue sample to apply step by step normal stress s
2, s
3, s
4, and by miniature penetrometer at the second side opening, the 3rd side opening, the 4th side opening successively the injection soil body, record miniature penetrometer reading F
2, F
3, F
4;
Step 5, according to miniature penetrometer reading F, by formula (1), calculate soil shear strength τ
f:
τ
f =0.512F-0.09 （1）
Obtain four shearing strength values, postscript corresponding to normal stress is (s
1, τ
f1), (s
2, τ
f2), (s
3, τ
f3), (s
4, τ
f4);
Step 6, take normal stress s as horizontal ordinate, soil shear strength τ
ffor ordinate, set up rectangular coordinate system, (the s that step 5 is obtained
i, τ
fi) in coordinate system, find corresponding point, four points are linked to be to one and look survey straight line, the intercept of straight line and axis of ordinates is soil strength-cohesion c; The angle of straight line and abscissa axis is soil strength-angle of internal friction j.
4. soil body shearing test method as claimed in claim 3, is characterized in that: can at sample end face, to sample, apply normal stress by other compression systems.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310686386.1A CN103616301A (en) | 2013-12-16 | 2013-12-16 | Soil body shearing testing device and soil body shearing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310686386.1A CN103616301A (en) | 2013-12-16 | 2013-12-16 | Soil body shearing testing device and soil body shearing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103616301A true CN103616301A (en) | 2014-03-05 |
Family
ID=50167007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310686386.1A Pending CN103616301A (en) | 2013-12-16 | 2013-12-16 | Soil body shearing testing device and soil body shearing method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535488A (en) * | 2014-12-24 | 2015-04-22 | 河南理工大学 | Device and method for in-situ measuring cohesive force and internal friction angle of slightly hard soil layer |
| CN104697855A (en) * | 2014-08-20 | 2015-06-10 | 南京大学（苏州）高新技术研究院 | Device and method for measuring fiber drawing creep |
| CN105973695A (en) * | 2016-07-29 | 2016-09-28 | 湖南科技大学 | Constant pressure loading device for similarity simulation experiments |
| CN105973723A (en) * | 2016-07-26 | 2016-09-28 | 山西省交通科学研究院 | Slope soil shear strength site test device and method |
| CN106153476A (en) * | 2016-08-09 | 2016-11-23 | 宁波中加低碳新技术研究院有限公司 | Timber rolls modulus of shearing and the method for testing of intensity |
| CN107271272A (en) * | 2016-10-21 | 2017-10-20 | 中国矿业大学 | A kind of pan soil intensity and the probe test apparatus and method of structured testing |
| CN107560945A (en) * | 2017-08-25 | 2018-01-09 | 浙江大学 | The composite board performance testing device and its method of testing of compression shear power Combined Loading |
| CN108562717A (en) * | 2018-05-09 | 2018-09-21 | 台州创兴环保科技有限公司 | A kind of portable soil pollution diagnosis equipment |
| CN108693048A (en) * | 2018-05-11 | 2018-10-23 | 温州大学 | Side slope solid shearing test device |
| CN109307628A (en) * | 2018-09-29 | 2019-02-05 | 中铁隧道局集团有限公司 | A kind of mud film shear strength test instrument and its method for measuring mud film shearing strength |
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| CN201145658Y (en) * | 2007-07-26 | 2008-11-05 | 河海大学 | Portable on site and indoor dual-purpose direct shear test instrument |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104697855A (en) * | 2014-08-20 | 2015-06-10 | 南京大学（苏州）高新技术研究院 | Device and method for measuring fiber drawing creep |
| CN104697855B (en) * | 2014-08-20 | 2017-07-14 | 南京大学（苏州）高新技术研究院 | A kind of fibne pull-out creep test device and its method of testing |
| CN104535488A (en) * | 2014-12-24 | 2015-04-22 | 河南理工大学 | Device and method for in-situ measuring cohesive force and internal friction angle of slightly hard soil layer |
| CN105973723A (en) * | 2016-07-26 | 2016-09-28 | 山西省交通科学研究院 | Slope soil shear strength site test device and method |
| CN105973695A (en) * | 2016-07-29 | 2016-09-28 | 湖南科技大学 | Constant pressure loading device for similarity simulation experiments |
| CN106153476A (en) * | 2016-08-09 | 2016-11-23 | 宁波中加低碳新技术研究院有限公司 | Timber rolls modulus of shearing and the method for testing of intensity |
| CN107271272A (en) * | 2016-10-21 | 2017-10-20 | 中国矿业大学 | A kind of pan soil intensity and the probe test apparatus and method of structured testing |
| CN107271272B (en) * | 2016-10-21 | 2019-08-09 | 中国矿业大学 | A kind of probe test device and method of pan soil intensity and structured testing |
| CN107560945A (en) * | 2017-08-25 | 2018-01-09 | 浙江大学 | The composite board performance testing device and its method of testing of compression shear power Combined Loading |
| CN108562717A (en) * | 2018-05-09 | 2018-09-21 | 台州创兴环保科技有限公司 | A kind of portable soil pollution diagnosis equipment |
| CN108693048A (en) * | 2018-05-11 | 2018-10-23 | 温州大学 | Side slope solid shearing test device |
| CN108693048B (en) * | 2018-05-11 | 2021-02-26 | 温州大学 | Side slope three-dimensional shearing test device |
| CN109307628A (en) * | 2018-09-29 | 2019-02-05 | 中铁隧道局集团有限公司 | A kind of mud film shear strength test instrument and its method for measuring mud film shearing strength |
| CN109307628B (en) * | 2018-09-29 | 2024-04-26 | 中铁隧道局集团有限公司 | Mud film shear strength test instrument and mud film shear strength measurement method thereof |
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Application publication date: 20140305 |