CN204461908U - A kind of soft clay undrained shear strength proving installation - Google Patents
A kind of soft clay undrained shear strength proving installation Download PDFInfo
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- CN204461908U CN204461908U CN201520211072.0U CN201520211072U CN204461908U CN 204461908 U CN204461908 U CN 204461908U CN 201520211072 U CN201520211072 U CN 201520211072U CN 204461908 U CN204461908 U CN 204461908U
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Abstract
A kind of soft clay undrained shear strength of the utility model proving installation, comprise static contact-detection machine and in-situ test probe, described static contact-detection machine has static contact-detection machine probe, described in-situ test probe has the storage tank matched of popping one's head in described static contact-detection machine.Utilize the utility model device to test, cladding earth pressure correction can not be relied on or introduce experience factor, reducing the error of test result, substantially increase the accuracy of result.
Description
Technical field
The utility model relates to a kind of soft clay undrained shear strength proving installation, espespecially a kind of soft clay undrained shear strength proving installation with in-situ test probe.
Background technology
The undrained shear strength test of soft clay is an important process in geotechnical engineering investigation.This index can directly apply to the work such as foundation bearing capacity is determined, bearing capacity of pile foundation is estimated, Critical Height of Embankment is determined, Foundation Pit Support Design.The method of testing of this index mainly contains laboratory experiment method and in-situ test method two class.Indoor test method adopts field sampling, and cut is carried out to soil sample in indoor, makes the sample of certain specification, then carries out unconfined compression strength test, direct shear test or triaxial compression test etc.Home position testing method mainly contains field vane shear test, cone penetration test etc.
In shop experiment process, sample stress condition is clear and definite, but at sampling and sample making course, large to the disturbance of sample natural structure, test findings dispersion is large, representative poor.Field vane shear test is the direct method of testing of original position the most frequently used at present, but testing efficiency is low, and can only obtain the single-point undrained shear strength along the degree of depth, measuring point spacing is generally 1.0m.Cone penetration test utilizes existing static sounding achievement and field vane shear test achievement to contrast, and sets up the empirical relationship of various soils, different regions, more indirectly tries to achieve soft clay undrained shear strength according to this empirical relationship.But in this empirical relationship, comprise the content such as cladding earth pressure correction, the experience factor relevant to soil nature and area.The value of these experience factors all will affect the accuracy of test result, thus limit the application that soft clay undrained shear strength is asked in cone penetration test.
Based on this, current pole needs one not need (or less needs) to rely on experience factor or cladding earth pressure correction just can obtain method and the proving installation thereof of the undrained shear strength of soft clay.
Utility model content
Solved technical matters of the present utility model is to provide a kind of soft clay undrained shear strength proving installation, this device is utilized to test, cladding earth pressure correction can not be relied on or introduce experience factor, reducing the error of test result, substantially increase the accuracy of result.
The technological means that the utility model adopts is as described below.
A kind of soft clay undrained shear strength proving installation, comprises static contact-detection machine and in-situ test probe, and described static contact-detection machine has static contact-detection machine probe, described in-situ test probe has the storage tank matched of popping one's head in described static contact-detection machine.
Described in-situ test probe is cylindrical crossbar, and described storage tank is arranged at the length direction center of this cross bar.
Described storage tank is conical recess.
Described conical recess cone angle is 60 °.
Arrange below described storage tank and receive dirty groove.
It is described that to receive dirty groove be cylindrical.
The beneficial effects of the utility model are as described below.
1, the utility model provides a kind of soft clay undrained shear strength proving installation, this proving installation result has strict theories integration, do not need empirical parameter, do not need cladding earth pressure correction, compared to conventional apparatus test result, the utility model device to test resultant error significantly reduces, and reliable test result is accurate.
2, existing field vane shear test test speed is slow, can only obtain the soil strength along degree of depth discrete point.And the utility model adds in-situ test probe on conventional static cone penetrometer, protect static contact-detection machine preferably, test process smoothness can be carried out, and finally can obtain continuous print test result, and test speed is very fast.
3, in the utility model, storage tank is conical recess, and conical recess cone angle is preferably 60 °, and can mate most of static sounding probe on market, range of application is comparatively extensive.
4, arrange below storage tank in the utility model and receive dirty groove, to be contained in the process of proving installation press-in underground, enter the soil in static sounding probe and in-situ test probe gap, and doublely can play protection static contact-detection machine and to pop one's head in the effect of tip.
Accompanying drawing explanation
Fig. 1 is the side view of the utility model soft clay undrained shear strength proving installation.
Fig. 2 is the front view of the utility model situ test probe.
Fig. 3 is the vertical view of the utility model situ test probe.
Fig. 4 is the cut-open view of the utility model situ test probe.
Embodiment
The utility model provides a kind of soft clay undrained shear strength proving installation, this proving installation result has strict theories integration, do not need empirical parameter, do not need cladding earth pressure correction, compared to conventional apparatus test result, the utility model device to test resultant error significantly reduces, and reliable test result is accurate.
Specifically, refer to Fig. 1 to Fig. 4, the utility model comprises static contact-detection machine and in-situ test probe 1, and this static contact-detection machine has static contact-detection machine probe 2, this in-situ test probe 1 has 2 storage tanks matched of popping one's head in described static contact-detection machine.
Wherein, in-situ test probe 1 answers the well-regulated shape of tool, to make the calculating of follow-up test result easier.Preferably, in-situ test probe 1 is cylindrical crossbar, and the cross-sectional area of in-situ test probe 1 like this more easily obtains.Preferably, this storage tank is arranged at the length direction center of cylindrical crossbar, makes cylindrical crossbar two ends uniform force, to promote the steadiness of static contact-detection machine probe 2 further, makes it not easily deflection occur.
Through actual market investigation, static contact-detection machine probe 2 is on the market mostly conical at present, and its cone angle is 60 °.Therefore, be the specification of coupling static contact-detection machine probe 2, in the utility model, storage tank is designed to conical recess 11, and the cone angle of this conical recess 11 is designed to 60 ° equally.
In addition, arrange below above-mentioned storage tank and receive dirty groove 12, to be contained in the process of proving installation press-in underground, enter static contact-detection machine probe 2 and the soil in in-situ test probe 1 gap, and doublely can play protection static contact-detection machine and to pop one's head in the effect of 2 tips.Preferably, this receives dirty groove 12 is cylindrically to pop one's head in the shape of 2 tips to mate static contact-detection machine.
The principle of work of the utility model device is described below in conjunction with Fig. 1.
First, the utility model in-situ test probe 1 level is placed in earth's surface, with static contact-detection machine pop one's head in 2 suit after, can apply feeler lever top load F, in-situ test probe 1 and static contact-detection machine being popped one's head in 2 is flatly pressed into underground.
Pressing down in process, surveying read tap by static contact-detection machine probe pressure transducer 3 and bore sharp resistance.Foundation soil resistance is divided by the numerical value after static sounding probe 2 cross-sectional area suffered by in-situ test probe 1 for this value, and unit is MPa.Therefore probe reading is multiplied by the cross-sectional area of static sounding probe 2, obtains cylindrical probe and pressing down suffered resistance P in process.Formula according to M.F.RANDOLPH and G.T.HOULSBY proposes:
Wherein, P is length, the S that probe resistance, D are in-situ test probe 1 lateral diameters, L is in-situ test probe 1
ufor Soft Clay Foundation undrained shear strength.
In above-mentioned formula (1), C is constant, and corresponding to the completely smooth and completely coarse two kinds of situations in in-situ test probe 1 surface, C is respectively 9.1 and 12.0.Desirable intermediate value 10.5 in practical application.
Soft clay undrained shear strength S can be obtained according to formula (1)
u:
And in static sounding test process, survey a reading along the general every 10cm of the degree of depth, test speed 1.2m/min, calculate undrained shear strength S by above-mentioned formula (2)
u, draw along change in depth curve.Thus, the undrained shear strength at soft clay different depth place is namely recorded.
Claims (6)
1. a soft clay undrained shear strength proving installation, it is characterized in that, comprise static contact-detection machine and in-situ test probe, described static contact-detection machine has static contact-detection machine probe, described in-situ test probe has the storage tank matched of popping one's head in described static contact-detection machine.
2. proving installation as claimed in claim 1, it is characterized in that, described in-situ test probe is cylindrical crossbar, and described storage tank is arranged at the length direction center of this cross bar.
3. proving installation as claimed in claim 2, it is characterized in that, described storage tank is conical recess.
4. proving installation as claimed in claim 3, it is characterized in that, described conical recess cone angle is 60 °.
5. as the proving installation as described in arbitrary in claim 1-4, it is characterized in that, arrange below described storage tank and receive dirty groove.
6. proving installation as claimed in claim 5, is characterized in that, described in receive dirty groove be cylindrical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201520211072.0U CN204461908U (en) | 2015-04-09 | 2015-04-09 | A kind of soft clay undrained shear strength proving installation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520211072.0U CN204461908U (en) | 2015-04-09 | 2015-04-09 | A kind of soft clay undrained shear strength proving installation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106546480A (en) * | 2015-09-22 | 2017-03-29 | 中国电力工程顾问集团华北电力设计院有限公司 | The test device of soft clay undrained shear strength |
| CN107326889A (en) * | 2017-07-31 | 2017-11-07 | 天津大学 | A kind of bar shaped probe and computational methods for detecting bury shear stress |
| CN107727483A (en) * | 2017-10-20 | 2018-02-23 | 南京大学（苏州）高新技术研究院 | A kind of injection shear and method for being used for ground in-situ test based on fiber grating |
| CN112964577A (en) * | 2021-02-20 | 2021-06-15 | 天津大学 | Series probe for measuring non-drainage shear strength of soft clay and test method |
-
2015
- 2015-04-09 CN CN201520211072.0U patent/CN204461908U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106546480A (en) * | 2015-09-22 | 2017-03-29 | 中国电力工程顾问集团华北电力设计院有限公司 | The test device of soft clay undrained shear strength |
| CN107326889A (en) * | 2017-07-31 | 2017-11-07 | 天津大学 | A kind of bar shaped probe and computational methods for detecting bury shear stress |
| CN107727483A (en) * | 2017-10-20 | 2018-02-23 | 南京大学（苏州）高新技术研究院 | A kind of injection shear and method for being used for ground in-situ test based on fiber grating |
| CN107727483B (en) * | 2017-10-20 | 2023-12-22 | 南京大学（苏州）高新技术研究院 | Penetration shearing device and method for foundation in-situ test based on fiber bragg grating |
| CN112964577A (en) * | 2021-02-20 | 2021-06-15 | 天津大学 | Series probe for measuring non-drainage shear strength of soft clay and test method |
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