CN105133563A - In-situ test method and device for rapidly determining shear strength of deep soil - Google Patents
In-situ test method and device for rapidly determining shear strength of deep soil Download PDFInfo
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- CN105133563A CN105133563A CN201510526171.2A CN201510526171A CN105133563A CN 105133563 A CN105133563 A CN 105133563A CN 201510526171 A CN201510526171 A CN 201510526171A CN 105133563 A CN105133563 A CN 105133563A
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Abstract
The invention discloses an in-situ test method and device for rapidly determining shear strength of deep soil. The in-situ test method comprises the steps that firstly, a drill bit is used for drilling into the deep soil, a movable loading head is used for carrying out step-by-step loading on the deep soil, and loading force and loading displacement are recorded until the soil is damaged; secondly, according to the loading force and the loading displacement recorded in the step one, a P-S curve of the loading force and the loading displacement is drawn; thirdly, according to the P-S curve drawn in the step two, the ultimate bearing capacity qult of the soil is obtained; and fourthly, the shear strength Su of the deep soil is calculated according to the ultimate bearing capacity qult, obtained in the step three, of the soil. Compared with the prior art, by means of the in-situ test method and device, the undrained shear strength of soil of any depth can be rapidly and accurately measured, and the method and device have the advantages of being capable of saving time and labor, efficient and the like.
Description
Technical field
The present invention relates to a kind of can the in-situ testing device of Fast Measurement deep soil shear strength, belong to the soil body in rock-soil engineering in-situ field tests and directly can measure home position testing method and the device of soil shear strength.
Background technology
In various civil engineering construction work, when carrying out the computational analysis of soil body stability, soil classifiction is wherein most important calculating parameter.Correctly can measure soil classifiction, the key point of designing quality and engineering success or failure often.Soil classifiction characteristic is relevant with many factors, mainly contains the composition of soil, structure (organize structure and interlink), history, stress and strain, and test method and technology etc.
In-situ testing technique can reduce the water content loss of soil sample before disturbance suffered by transportation and laboratory test and the problem of the generation such as dimensional effect; Undisturbed soil in situ strength accurately can be obtained to obtaining the rock-soil material being difficult to obtain representative undisturbed; Simultaneously it also has duration shorter advantage.
Summary of the invention
Technical problem: the technical problem to be solved in the present invention is for there is no the device directly carrying out in-situ measurement for the shear strength of the soil body at present, invent a kind of home position testing method and device of Fast Measurement deep soil shear strength easy, effective, simple to operate, effectively can obtain the shear strength under soil in-situ state.
Technical scheme:
A home position testing method for Fast Measurement deep soil shear strength, is characterized in that, step is:
Step one, adopt bit bore to deep soil, adopt mobile loading head to carry out multistage loadings to deep soil, and record loading force and load deflection until damage of soil body;
Step 2, the loading force recorded according to step one and load deflection, draw the P-S curve of loading force and load deflection;
Step 3, the P-S curve drawn according to step 2, obtain the ultimate bearing capacity q of the soil body
ult;
Step 4, the ultimate bearing capacity q of the soil body obtained according to step 3
ult, calculate deep soil shear strength S
u:
S
u＝q
ult/n
In formula, n is bearing capacity factor value.
The shape of described dynamic loading head is circular, and bearing capacity factor value gets n=0.0625.
Described mobile head of recording is for being positioned at the mobile piston of described drill bit.
A kind of in-situ testing device of Fast Measurement deep soil shear strength, it is characterized in that: comprise loading head, data collecting system and data handling system, described record head is a sliding plunger be connected with depression bar, described data collecting system comprises one for measuring the stressed pressure measurement cell of described sliding plunger and for measuring the displacement measurement unit of described sliding plunger displacement, and described data handling system obtains soil shear strength according to the force data of described data acquisition system and displacement data.
Described sliding plunger is positioned at a drill bit, and described displacement measurement unit is arranged on described drill bit top, and described pressure measurement unit is arranged on bottom described sliding plunger.
Described displacement measurement unit is displacement transducer.
Described pressure measurement cell gathers the soil body and acts on force data on described sliding plunger when destroying, described displacement measurement unit gathers the displacement data of soil body movable piston when destroying, and described data handling system obtains soil shear strength according to the force data of pressure measurement cell during damage of soil body and the displacement data of displacement measurement unit.
The home position testing method of Fast Measurement deep soil shear strength of the present invention and device, adopt depression bar slidably will be pressed into the soil body by piston from drill bit top; In process of press in, the displacement S of drill bit top displacement transducer recording and analyses press-in, the pressure P suffered by the pressure measurement unit record soil body of piston lower portion, until the soil body destroys completely.
Beneficial effect: soil classifiction is one of the most basic mechanical index of soil is the basic parameter that civil engineering prospecting field needs first to determine.The determination of current soil classifiction depends on drill hole sampling and laboratory test, but due to the disturbance sampled and the forfeiture of transporting moisture in soil sample process, makes the result of laboratory test often there is error.
The invention solves Fast Measurement deep soil shear strength problem, the undrained shear strength under deep soil home state can be obtained.Effectively can shorten the quality of deep soil, reduce prospecting cost, improve investigation accuracy.
Accompanying drawing explanation
Fig. 1 is component arrangement figure of the present invention;
Fig. 2 is the loading-displacement curve schematic diagram of the soil body.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
The in-situ testing device of Fast Measurement deep soil shear strength of the present invention, comprises loading head mobile piston 5, the data collecting system be made up of displacement transducer 3 and pressure measurement cell 6 and the data handling system that rear end is connected with depression bar 2 and forms.Wherein displacement transducer 3 is connected with the data handling system on ground by transmission cable 1 with pressure measurement cell 6.It is inner that sliding plunger 5 is positioned at drill bit 4; Drill bit 4 top is provided with displacement transducer 3, is provided with pressure measurement unit 6 bottom sliding plunger 5.
Outside diameter 76.2mm, internal diameter 75mm.
Displacement transducer minimum resolution 0.1mm; Operating temperature :-20 DEG C+70 DEG C.
Pressure measurement unit meets linearity error < ± 0.1%FS, repeatability error < ± 0.25%FS, hysteresis error < ± 0.4%FS; Operating temperature is-20 DEG C ~+70 DEG C.
Sliding plunger 5 is pressed into the soil body from drill bit 4 top by depression bar 2; In process of press in, the displacement S of drill bit top displacement transducer 3 recording and analyses press-in, the pressure measurement unit 6 of piston lower portion records the pressure P suffered by the soil body, until the soil body destroys completely, generates loading P ~ S curve as shown in Figure 2.
As can be seen from the P-S curve in Fig. 2, the distortion of the soil body is mainly divided into three phases: the OA stage is straight line deformation stage (P < P
0), the soil body is in elastic stage; The AB stage is plastic period (P
0< P≤P
u), part soil body generation shear failure; The BC stage is failure stage (P < P
u), the soil body reaches failure stage completely.
In Fig. 2, the P that B point displacement place is corresponding
uvalue is Ultimate bearing Capacity q
ult, according to the Bearing Capacity Theory of soil,
q
ult＝n*S
u(1)
In formula, n is bearing capacity factor, relevant with dynamic loading head cross sectional shape, moves loading head, usually get n=0.0625 for circle; S
ufor the undrained shear strength of the soil body.
Load the P ~ S curve obtained according to the soil body, determine corresponding Ultimate bearing Capacity q
ult, then according to the bearing capacity factor n of correspondence, according to foundation formula (1) and then the undrained shear strength S determining various soil mass
u.
Claims (7)
1. a home position testing method for Fast Measurement deep soil shear strength, is characterized in that, step is:
Step one, adopt bit bore to deep soil, adopt mobile loading head to carry out multistage loadings to deep soil, and record loading force and load deflection until damage of soil body;
Step 2, the loading force recorded according to step one and load deflection, draw the P-S curve of loading force and load deflection;
Step 3, the P-S curve drawn according to step 2, obtain the ultimate bearing capacity q of the soil body
ult;
Step 4, the ultimate bearing capacity q of the soil body obtained according to step 3
ult, calculate deep soil shear strength S
u:
S
u＝q
ult/n
In formula, n is bearing capacity factor value.
2. home position testing method according to claim 1, is characterized in that: the shape of described dynamic loading head is for circular, and bearing capacity factor value gets n=0.0625.
3. home position testing method according to claim 1, is characterized in that: described mobile head of recording is for being positioned at the mobile piston of described drill bit.
4. the in-situ testing device of a Fast Measurement deep soil shear strength, it is characterized in that: comprise loading head, data collecting system and data handling system, described record head is a sliding plunger be connected with depression bar, described data collecting system comprises one for measuring the stressed pressure measurement cell of described sliding plunger and for measuring the displacement measurement unit of described sliding plunger displacement, and described data handling system obtains soil shear strength according to the force data of described data acquisition system and displacement data.
5. in-situ testing device according to claim 4, is characterized in that: described sliding plunger is positioned at a drill bit, and described displacement measurement unit is arranged on described drill bit top, and described pressure measurement unit is arranged on bottom described sliding plunger.
6. the in-situ testing device of Fast Measurement deep soil shear strength according to claim 5, is characterized in that: described displacement measurement unit is displacement transducer.
7. in-situ testing device according to claim 4, it is characterized in that: described pressure measurement cell gathers the soil body and acts on force data on described sliding plunger when destroying, described displacement measurement unit gathers the displacement data of soil body movable piston when destroying, and described data handling system obtains soil shear strength according to the force data of pressure measurement cell during damage of soil body and the displacement data of displacement measurement unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510526171.2A CN105133563B (en) | 2015-08-25 | 2015-08-25 | A kind of home position testing method and device of quick measure deep soil shearing strength |
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|---|---|---|---|
| CN201510526171.2A CN105133563B (en) | 2015-08-25 | 2015-08-25 | A kind of home position testing method and device of quick measure deep soil shearing strength |
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| CN105133563B CN105133563B (en) | 2017-06-20 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105862703A (en) * | 2016-03-29 | 2016-08-17 | 长安大学 | In-situ test method and device for karst area roadbed bearing capacity |
| CN105928803A (en) * | 2016-07-15 | 2016-09-07 | 中南大学 | Soil shear strength parameter in-situ test apparatus and test method thereof |
| CN106906815A (en) * | 2017-03-08 | 2017-06-30 | 中交第二航务工程局有限公司 | Foundation bearing capacity and side friction measurement apparatus and its application method |
| CN110082211A (en) * | 2019-05-22 | 2019-08-02 | 江苏科技大学 | A kind of speed-limited liquidation soil intensity device for fast detecting and detection method |
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| US4649741A (en) * | 1985-08-22 | 1987-03-17 | Geomatic | Insitu soil shear measurement apparatus |
| JPH10160715A (en) * | 1996-11-27 | 1998-06-19 | Taisei Corp | Measuring method for shear rigidity of soil |
| CN200971493Y (en) * | 2006-08-01 | 2007-11-07 | 徐光黎 | Self-drill in-situ friction shearing instrument |
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| US4649741A (en) * | 1985-08-22 | 1987-03-17 | Geomatic | Insitu soil shear measurement apparatus |
| JPH10160715A (en) * | 1996-11-27 | 1998-06-19 | Taisei Corp | Measuring method for shear rigidity of soil |
| CN200971493Y (en) * | 2006-08-01 | 2007-11-07 | 徐光黎 | Self-drill in-situ friction shearing instrument |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105862703A (en) * | 2016-03-29 | 2016-08-17 | 长安大学 | In-situ test method and device for karst area roadbed bearing capacity |
| CN105862703B (en) * | 2016-03-29 | 2017-12-05 | 长安大学 | A kind of home position testing method and test device of karst area roadbed bearing capacity |
| CN105928803A (en) * | 2016-07-15 | 2016-09-07 | 中南大学 | Soil shear strength parameter in-situ test apparatus and test method thereof |
| CN105928803B (en) * | 2016-07-15 | 2019-06-11 | 中南大学 | A kind of the shear strength parameter in-situ testing device and test method of the soil body |
| CN106906815A (en) * | 2017-03-08 | 2017-06-30 | 中交第二航务工程局有限公司 | Foundation bearing capacity and side friction measurement apparatus and its application method |
| CN106906815B (en) * | 2017-03-08 | 2019-01-04 | 中交第二航务工程局有限公司 | Foundation bearing capacity and side friction measuring device and its application method |
| CN110082211A (en) * | 2019-05-22 | 2019-08-02 | 江苏科技大学 | A kind of speed-limited liquidation soil intensity device for fast detecting and detection method |
| CN110082211B (en) * | 2019-05-22 | 2024-01-19 | 江苏科技大学 | Speed-limiting type quick detection device and detection method for strength of fluidized soil |
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| Publication number | Publication date |
|---|---|
| CN105133563B (en) | 2017-06-20 |
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