CN106368201A - Method for quickly detecting bearing capacity of natural foundation of low-filling shallow-digging roadbed - Google Patents
Method for quickly detecting bearing capacity of natural foundation of low-filling shallow-digging roadbed Download PDFInfo
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- CN106368201A CN106368201A CN201610955912.3A CN201610955912A CN106368201A CN 106368201 A CN106368201 A CN 106368201A CN 201610955912 A CN201610955912 A CN 201610955912A CN 106368201 A CN106368201 A CN 106368201A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/02—Investigation of foundation soil in situ before construction work
- E02D1/022—Investigation of foundation soil in situ before construction work by investigating mechanical properties of the soil
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a method for quickly detecting the bearing capacity of a natural foundation of a low-filling shallow-digging roadbed. The method comprises the following steps that (1) the bearing capacity of the low-filling shallow-digging roadbed is analyzed; (2) the advantages, the disadvantages and the applicability of an existing roadbed resilient modulus determining method and the characteristics of a DCP method are presented; (3) the DCP method is introduced and testing procedures are conducted; and (4) the applicability of the DCP method for quickly detecting the bearing capacity of the low-filling shallow-digging natural foundation is verified. According to the method for quickly detecting the bearing capacity of the natural foundation of the low-filling shallow-digging roadbed, testing data are reliable, the operation and detection methods are easy, site limitation is avoided, the applicability is wide, and the method is more suitable for the detection of the natural foundation than other detection methods; and the penetration Dd detected by the DCP method has a good correlation relationship with the resilient modulus E0 and the CBR, and the method can conduct quick detection for the low-filling shallow-digging roadbed and has good promotion value.
Description
[technical field]
The invention belongs to shallow cut roadbed sky is filled out and in particular to a kind of quick detection is low in highway subgrade road surface on-the-spot test field
So method of foundation bearing capacity.
[background technology]
Roadbed is the basis of whole road structure, and the quality of roadbed quality directly influences the use matter of whole road structure
Amount, roadbed plays a supportive role for pavement structure, and the intensity of its non-deformability road pavement structure, rigidity and stability play decision
The effect of property.Once quality problems in roadbed, and highway will be made serious plant disease, so must assure that the construction matter of roadbed
Amount.
Fill out roadbed for low, its subsoil is within deflection test influence depth, the flexure of roadbed top surface is by natural
The characteristic impact of ground is very big.If the intensity of subsoil is relatively low requiring and roadbed top it is easy to fill compaction degree occurring and meeting
Face deflection value is unsatisfactory for situation about requiring.For shallow cut cutting, its substrate-loading ability is low, the performance impact road of the substrate soil body
Base top surface deflection testing result, can lead to compactness satisfaction requirement during roadbed final acceptance of construction and deflection value is unsatisfactory for requiring
Situation.
If roadbed top surface deflection value can be estimated out before subgrade construction, if not up to standard, then take some engineerings pre- in advance
Treatment measures, such as backfill roll, improve the compactness of fill stratum, inorganic binder punishment natively basic unit etc., thus keep away
Deflection value exceeded phenomenon when having exempted to check and accept.It is therefore desirable to the modulus of resilience of the modulus of resilience to subsoil and fill stratum is entered
Row research.
Can be seen that, what presently used method determined is all that roadbed is integrally-built comprehensive from the current method determining the modulus of resilience
Close the modulus of resilience, not can determine that the modulus of resilience of subsoil or fill stratum.Therefore the on going result such as look-up table, scaling method is not
This research can be used for.Lab bearing plate test, due to the test specimen of plastic difference compactness and moisture content, can be used for simulating fill stratum,
But because test specimen is subject to examination cylinder barrel and the rigid constraint at cylinder bottom to act on, need it is revised, revised result can be used for filling out
The determination of the soil layer modulus of resilience.Although live loading plate method and backman beam method can measure the resilience mould of subsoil in theory
Amount, but there are a variety of difficulties in practice, such as subsoil does not possess condition of test carriage traveling etc., thus to natively
The method of testing of base has special requirement.Compare other method of testings, dcp test is more suitable for the test of subsoil, dcp
Test is a kind of purely mechanic, small portable and quick detection equipment simple to operate, can reach and test appointing of subsoil
How a bit, operator can need not grasp operational approach easily through professional training, and data processing is simple.
[content of the invention]
It is an object of the invention to overcoming the shortcoming of above-mentioned prior art, provide that a kind of quick detection is low to fill out shallow cut roadbed sky
So method of foundation bearing capacity, dcp method can be using test pile penetration ddThe reflection subsoil modulus of resilience, and simple to operate,
Compare other method of testings, dcp test is more suitable for the test of subsoil.
For reaching above-mentioned purpose, the present invention employs the following technical solutions and is achieved:
A kind of low method filling out shallow cut roadbed natural foundation bearing capacity of quick detection, comprises the following steps:
1) low shallow cut subgrade rating of filling out is analyzed；
2) fill out shallow cut natural foundation bearing capacity using dcp method quick detection is low.
The present invention is further improved by:
Described step 1) in, according to the relation of deflection test influence depth and the depth of fill or cutting depth, fill out to low
The bearing capacity of embankment and shallow cut cutting is analyzed:
1-1) fill out roadbed for low, its subsoil is within deflection test influence depth, during deflection testing, test carriage
The additional stress that produces of standard axle load still very big at subsoil, the deflection value of roadbed top surface depends on fill stratum and stone roller
The two-part intensity of laminate layer.So filling out in embankment low, in addition to artificial earth fill's layer, the characteristic of subsoil is curved to roadbed top surface
The influence of heavy value is than more significant.
1-2) for shallow cut cutting, less by weight stress effect before excavating, substrate entire load-carrying capacity is low, at compacting
The depth of reason effect is limited, now, the deflection testing result of the performance appreciable impact roadbed top surface of the substrate soil body.
Described step 2) concrete grammar as follows:
2-1) dcp is placed point position, a people hand steered instrument handle, so that feeler lever is kept vertically, a people lift drop hammer to
Guide post top, then unclamps, and is allowed to into freely falling body；
2-2) read depth of penetration, every injection 10mm reads a number, record blow counts and injection amount；
2-3) continuous hammering, measurement, until the structure layer depth needing；When material layer is hard, injection amount is low to be hammered into shape to continuous
Hit 10 times and unchanged when, stop test or boring by rear continue test；
2-4) will drop hammer and remove, take dcp instrument from test pit away.
Described step 2-2) in, for pellet class basic unit, every 5-10 hammering reading is once；For soft structure sheaf,
Every 1-2 hammering reading is once.
Compared with prior art, the method have the advantages that
The present invention is on the basis of the analysis of subgrade resilient modulus existing determination method, is contrasted with dcp method, dcp
Method test is simply it is easy to operate, pile penetration d surveyeddWith modulus of resilience e0, cbr etc. there is good dependency relation, this method can
To be used for quickly detecting to low shallow cut roadbed of filling out.
Further, the method for the present invention relies on Yuan Shen highway Yuanping City section subgrade engineering, to its feasibility and reliability
Property is verified, the method has been also carried out good application in entity project simultaneously.
[brief description]
The structural representation that Fig. 1-1 bores for power of the present invention；
Fig. 1-2 is the structural representation of conehead of the present invention；
Fig. 2 fills out embankment cross-sectional view for low；
Fig. 3 is shallow cut embankment cross-sectional view；
Fig. 4-1 is pile penetration ddWith modulus of resilience e dependency relation figure；
Fig. 4-2 is surveyed the modulus of resilience and deflection value dependency relation figure by plate method.
Wherein, 1- handle；2- drops hammer；3- guide post；4- shaft coupling；5- handrail；6- steps up ring；7- feeler lever；8- rule；
9- conehead；10- fill stratum；11- subsoil；12- deflection test influence depth；13- original place upper thread.
[specific embodiment]
Below in conjunction with the accompanying drawings the present invention is described in further detail:
The present invention using the low quick detection filling out shallow cut roadbed natural foundation bearing capacity of power coning row, such as Fig. 1-1 and figure
Shown in 1-2, power cone includes guide post 3, and the top of guide post 3 is provided with drops hammer 2, and conehead 9, middle part setting handrail are installed in bottom
5；Drop hammer 2 upper end is provided with handle 1.Handrail 5 passes through shaft coupling more than 4 guide post 3 and is connected, and is fastened by stepping up ring 6.Guiding
The side of bar 3 is arranged with rule 8 in parallel, and the range of rule 8 is 1m.
The low method filling out shallow cut roadbed natural foundation bearing capacity of quick detection of the present invention, comprises the following steps:
1), the relation according to deflection test influence depth 12 and the depth of fill or cutting depth, to the low embankment and shallow filled out
The bearing capacity of road breaking moat is analyzed；
2) fill out shallow cut natural foundation bearing capacity using dcp method quick detection is low, specifically comprise the following steps that
2-1) dcp is placed point position, a people hand steered instrument handle, so that feeler lever is kept vertically, a people lift drop hammer to
Guide post top, then unclamps, and is allowed to into freely falling body；
2-2) read depth of penetration, every injection 10mm reads a number, record blow counts and injection amount；
For pellet class basic unit, every 5-10 hammering reading is once；For soft structure sheaf, every 1-2 hammering reading
Once.
2-3) continuous hammering, measurement, until the structure layer depth needing；When material layer is hard, injection amount is low to be hammered into shape to continuous
Hit 10 times and unchanged when, stop test or boring by rear continue test；
2-4) will drop hammer and remove, take dcp instrument from test pit away.
The principle of the present invention:
1st, the low Analysis of Bearing Capacity filling out shallow cut roadbed
The 1.1 low Analysis of Bearing Capacity filling out embankment
Fill out roadbed for low, such as Fig. 2, relatively low due to banketing, its subsoil 11 be in deflection test influence depth 12 it
Interior, during deflection testing, the additional stress that the standard axle load of test carriage produces is still very big at subsoil 11, roadbed top surface
Deflection value depends on fill stratum 10 and the two-part intensity of rolling layers.So filling out in embankment low, in addition to artificial earth fill's layer 10,
The impact to roadbed top surface deflection value for the characteristic of subsoil 11 is also very big.Subsoil 11 compares fill stratum 10, if closely knit
Degree is relatively low, intensity is relatively low, and bearing capacity is poor, even if fill stratum 10 construction quality reaches requirement, if subsoil 11 intensity is relatively
Low it is also possible to cause the not high phenomenon of bulk strength.So low fill out fill stratum 10 when embankment often occurs construction every layer
Roadbed top surface deflection value exceeded phenomenon when compactness all meets requirement and checks and accepts.So filling out embankment in some cases for low
It is necessary to take certain treatment measures to subsoil 11.
The Analysis of Bearing Capacity of 1.2 shallow cut cuttings
Shallow cut cutting is shallow due to cutting depth, and the weight stress effect being subject to before excavation is less, and degree of compaction is relatively low, overall carrying
Ability is low, will roll through leveling, and will reach certain compactness after specification regulation cutting excavation, but compaction treatment
Depth of interaction limited, after exceeding certain depth, be compacted effect that it is produced very little.
So two-layer can be divided into consider for shallow cut cutting, one layer is to have certain degree of compaction and one after the effect of being rolled
Determine the soil layer of the thinner thickness of intensity；One layer be above-mentioned soil layer bottom subsoil 11.As Fig. 3, the subsoil 11 of bottom
It is in the bulk strength largely affecting roadbed in the range of deflection test influence depth 12, if subsoil 11 is relatively
For weakness, even if top reaches requirement through the soil layer degree of compaction rolling process, it is likely to appearance examination deflection value and does not reach
Target phenomenon.
2nd, existing subgrade resilient modulus determine the pluses and minuses of method and the feature of the suitability and dcp method
2.1 existing subgrade resilient modulus determine pluses and minuses and the suitability of method
At present the determination method of the modulus of resilience mainly has: live loading plate method, backman beam method, simulation laboratory test method,
Look-up table and scaling method etc., wherein lab simulation method, look-up table and scaling method are the methods for determining design modulus of resilience value, should
Value can provide foundation for the design on road surface；And scene loading plate method and backman beam method are field measurement methods, it is to detect into
Whether type roadbed reaches design requirement value.Conversion rule is to set up the surveyed e of plate-bearing test by lot of experimental data0With compacting
Degree k, consistency of subgrade ωcOr the relational expression with indoor roadbed cbr value etc., calculate subgrade resilient modulus value using conversion relation formula
Method, adopts look-up table in designing at present more.Although many scholars are devoted to the research that the modulus of resilience determines method for many years,
Still suffer from many problems at present, special-purpose vehicles and test speed need to be used excessively slow as the loading plate method in field measurement method there is test
Shortcoming, and the measurement result of laboratory experiment method typically bigger than normal it is difficult to meet actual requirement, need to set up indoor and outdoor tests data
Between relation, conversion rule has the relational expression in different regions different condition section and is difficult to unified problem.
Can be seen that, what presently used method determined is all that roadbed is integrally-built comprehensive from the current method determining the modulus of resilience
Close the modulus of resilience, not can determine that subsoil 11 or the modulus of resilience of fill stratum 10.The therefore existing one-tenth such as look-up table, scaling method
Fruit cannot be used for this research.Lab bearing plate test, due to the test specimen of plastic difference compactness and moisture content, can be used for simulation and fills out
Soil layer 10, but because test specimen is subject to examination cylinder barrel and the rigid constraint at cylinder bottom to act on, need it is revised, revised result can
Determination for fill stratum 10 modulus of resilience.Although live loading plate method and backman beam method can measure subsoil in theory
11 modulus of resilience, but there are a variety of difficulties in practice, such as subsoil 11 does not possess condition of test carriage traveling etc.,
Thus have special requirement to the method for testing of subsoil 11.
The feature of 2.2dcp method
The special operating environment requirements testing equipment of subsoil 11 is simple, economy and durability, the spy such as easy to detect, quick
Point, power cone penetrometer (dcp) is simple, easy to carry, sturdy and durable because of its test apparatus, and operation and method of testing are easy, no
Limited by place, the advantages of the suitability is wide, compared the test more suitable for subsoil 11 for other method of testings.And dcp method
Pile penetration d surveyeddThere is good dependency relation with modulus of resilience e0, cbr etc., this method can be carried out to low shallow cut roadbed of filling out
Quick detection.
3rd, the introduction of dcp method and test procedure
The introduction of 3.1dcp method
Power bore penetrometer (dcp) be a kind of small portable foundation soil in-situ test instrument, some states of the U.S. incited somebody to action
This test be used for subgrade resilient modulus and compactibility etc. detection, abroad Ying Jing be widely used, South Africa using injection value as
One of parameter of Pavement Design.Domestic formal in 2008 power cone penetrometer is written to " highway engineering on-the-spot test code "
In (jtg e60-2008), but still little in China's application, it is in introducing and preliminary stage of application, only several public affairs of minority
Road is such as: Shanghai and Nanjing, too Australia, Tang Jin at a high speed etc. to detect Subgrade Compaction and intensity using dcp, carry out dcp experimental study at present
Less, also it is not affected by enough attention.And in " highway subgrade road surface on-the-spot test code " (jtg e60-2008), dcp is tried
The introduction tested, regulation are also very simple, and operability and practicality are all not strong.Because Highway Cause Chinese at present is advised still in big
The building the phase of mould, therefore the application prospect of dcp quick detection equipment is very open.
Power cone penetrometer (dcp) test is using certain hammering energy, and the circular cone probe of a certain specification is driven into soil
In, surveyed according to a kind of scene that the complexity (penetration resistance or pile penetration etc.) that probe is driven in soil differentiates soil mass property
Method for testing.
This equipment is compared other means of testing and is had the advantage that
(1) equipment is simple, sturdy and durable；
(2) operation and method of testing are easy；
(3) suitability is wide；
3.2dcp testing equipment and step
3.2.1 testing equipment
Instrument and technical requirements for materials:
Dcp testing equipment includes: handle, drop hammer, guide post, shaft coupling (hammer seat), handrail, clamping ring, feeler lever, 1m scale
Chi, conehead, as shown in Figure 1.
The standard drop hammer quality is 8kg or 10kg.
Conehead angle is 90 °, 60 ° or 30 °, maximum gauge 20mm.The maximum allowable abrasion size of conehead, most advanced and sophisticated is 4mm, directly
Footpath is 10%, otherwise must change.This experiment also needs to spanner, spades, minute book etc..
3.2.2 experimental test step
1) dcp is placed point position, a people hand steered instrument handle, so that feeler lever is kept vertically, a people lifts and drops hammer to leading
To masthead end, then unclamp, be allowed to into freely falling body.If in test, feeler lever slightly tilts, can not righting；If tilted
Larger, causing to drop hammer is not freely falling body, then this testing site should be discarded.
2) read depth of penetration.Every injection about 10mm reads a number, record blow counts and injection amount (mm).
For pellet class basic unit, reading may be hammered once every 5-10 time；For the relatively soft structure sheaf of ratio, possible 1-2
Secondary hammering reading is once.
3) continuous hammering, measurement, until the structure layer depth needing.When material layer is hard, injection amount is low to be hammered to continuous
10 times and unchanged when, can stop test or hole by rear continue test.
4) will drop hammer and remove, take dcp instrument from test pit away
4th, the checking of the low suitability filling out shallow cut natural foundation bearing capacity of dcp method quick detection
4.1dcp test data analyzer
Dcp result of the test is typically with pile penetration (the injection amount averagely often hit) ddRepresent it is clear that soil strength is higher, injection
Degree is less, and soil strength is lower, and pile penetration is bigger, and therefore this index can reflect the intensity size of roadbed, lot of domestic and international
Person expert establishes dcp pile penetration ddWith modulus of resilience e0, the dependency relation between cbr value.According to a large amount of measured results both at home and abroad
Statistical analysiss show, dcp pile penetration ddWith modulus of resilience e0, cbr value etc. there is good dependency relation formula, statistical regression closes
System is typically fitted using power function, so not only while ensureing that regression relation has higher correlation coefficient,
Also make relational expression form simple and clear, easy to use.I.e. using formula form:
Y=a xb(4.1)
In formula, y is the dependent variable of regression relation, i.e. the modulus of resilience (mpa)；X is the independent variable of regression relation, i.e. dcp
Pile penetration d of testd(mm/ hammer)；A and b is regression coefficient.
The checking of the 4.2dcp method suitability
Test pile penetration d in order to check with dcpdThe feasibility of reflection subsoil 11 modulus of resilience and practicality, this
Mesh relies on Yuan Shen highway Yuanping City section subgrade engineering, carries out dcp test on subsoil 11 surface, and shows in same point
The tests such as field loading plate.
4.2.1 the arrangement of measuring point and preparation
(1) selection of measuring point, this section choose low fill out shallow cut section roadbed, and landform is relatively flat, can be smoothed out
The section of test, measuring point is longitudinally arranged along roadbed, and measuring point spacing is no less than 10m.
(2) preparation tested: 1. laboratory test, field investigation and sampling carries out Indoor Impaction Test and (hits using heavy -1
Real method) and native liquid model limitation test (by liquid plastic combine tester method), the maximum dry density obtaining soil is 1.83g/
Cm3, optimum moisture content are 13.8%, and liquid limit is 30, and plastic limit is 18；2. live preparation: because subsoil 11 surface is put down
Whole differ, the soil is porous, is unfavorable for the traveling of instruction carriage and the carrying out of correlation test；So at need to be to subsoil 11 slightly work
Reason, including flattening and rolling, rolls using light-duty non-vibratory roller, rolls one time, so gets final product the suitable of guarantee test
Profit is carried out, and will not produce excessive impact to the mechanical property of subsoil 11 again.
4.2.2 content of the test
(1) backman beam method surveys the modulus of resilience (i.e. wheel method surveys the modulus of resilience)
Subsoil 11 modulus of resilience is carried out using the standard vehicle that the backman beam instrument of 3.6m, rear axle are bzz-100 again
Detection.
(2) live loading plate method surveys the modulus of resilience (i.e. plate method surveys the modulus of resilience)
Carry out the detection of the modulus of resilience using the rigid bearing plate that a diameter of 30cm, thickness of slab are 2cm, control and be deformed into 1mm
Within, load series and take 6～7 grades.
(3) power cone penetrometer (dcp) test
It is 10kg using hammer again, fall away from the penetrometer for 57.5cm, depth measurement is 80cm.
All of above field test all should respectively test all Ying Tong using " point-to-point " one-to-one principle in principle
Carry out on one measuring point, with the comparability of guarantee test result, it is contemplated that some tests have the work of destruction or densification to the soil body
With impact can be produced on ensuing test, so ensuing test is selected in the vicinity of above-mentioned measuring point.
4.2.3 fieldtesting results and correlation analysiss
Collect collated for done experiment data, be shown in Table 4-1:
Table 4-1 field test data collects
In order to check feasibility and the practicality of dcp testing inspection subsoil 11 modulus of resilience, summarize in conjunction with domestic and international
Experience, using the regression relation of power form, set up live dcp and test surveyed pile penetration and scene loading plate institute survey time bullet
Regression relation between modulus.
Live loading plate method according to being specified using " highway subgrade road surface on-the-spot test code " (jtg e60-2008) is surveyed
Subsoil 11 modulus of resilience value obtaining, sets up and pile penetration d being recorded with dcp penetration testdBetween dependency relation formula, close
It is curve chart, see Fig. 4-1.
By Fig. 4-1 as can be seen that surveyed modulus of resilience e of loading plate tests surveyed pile penetration d with dcpdAssume the pass of inverse ratio
System.Work as ddWhen 7mm/ hammers 13mm/ hammer into shape, modulus of resilience value drops to 50.3mpa from 85.1mpa, and fall is 41%.Pick
Except abnormity point, its regression relation is specific as follows:
E=209.92dd -0.511(n=20, r2=0.8288) (4.1)
In formula: e loading plate institute survey time bullet modulus value (mpa)
ddPile penetration (mm/ hammer)
As can be seen that the correlation coefficient of regression relation has reached 0.8288, dependency is good, so, with dcp injection examination
Test can accurate reaction subsoil 11 modulus of resilience size, compare live loading plate method, dcp test has instrument letter
The advantages of single, easy to carry, test is quick.
By the data in table 4-1, following relation can also be set up:
(1) dependency relation between live plate-bearing test and Benkelman beam test
It is right as follows that backman beam method (that is: taking turns method) measured result and live loading plate method (that is: plate method) measured result are done
Than:
Table 4-2 wheel method is contrasted with plate method measured result
Be can be seen that by table 4-2, wheel method measured result is generally less than normal compared with plate method measured result, and plate method surveys subgrade resilient modulus
More accuracy.Between flexure measured value and live the surveyed modulus of resilience of loading plate, available power function is fitted, matched curve
As shown in the Fig. 4-2.
Regression relation is as follows:
E=2291.1l0 -0.68(n=21, r2=0.8776) (4.2)
Correlation coefficient reaches 0.8776, and dependency is good, and therefore, this soil property of this area adopts backman beam method survey time bullet mould
During amount, the result of calculation using formula (4.2) is more accurate than theoretical formula method result.
(2) dependency relation between live the surveyed modulus of resilience of loading plate method and compactness and denseness
When soil property one timing, Rebound Modulus of Subgrade is the binary function of compactness and denseness, exists in theory between three
Good dependency.Therefore, divide carrying out binary regression between live loading plate method institute survey time bullet modulus value and compactness and denseness
Analysis, can obtain following result:
E=77.01k2.637wc 0.785(n=21, r2=0.80) (4.3)
Correlation coefficient has reached 0.80, and dependency is good, and therefore this soil property for this area is it is also possible to pass through to detect sky
The so compactness of ground 11 and moisture content, calculates the modulus of resilience of subsoil 11 by formula (4.3).
Above content technological thought only to illustrate the invention, it is impossible to limit protection scope of the present invention with this, every is pressed
According to technological thought proposed by the present invention, any change done on the basis of technical scheme, each fall within claims of the present invention
Protection domain within.
Claims (4)
1. a kind of low method filling out shallow cut roadbed natural foundation bearing capacity of quick detection is it is characterised in that comprise the following steps:
1) low shallow cut subgrade rating of filling out is analyzed；
2) fill out shallow cut natural foundation bearing capacity using dcp method quick detection is low.
2. the low method filling out shallow cut roadbed natural foundation bearing capacity of quick detection according to claim 1 it is characterised in that
Described step 1) in, according to the relation of deflection test influence depth and the depth of fill or cutting depth, to the low embankment and shallow filled out
The bearing capacity of road breaking moat is analyzed.
3. the low method filling out shallow cut roadbed natural foundation bearing capacity of quick detection according to claim 1 it is characterised in that
Described step 2) concrete grammar as follows:
2-1) dcp is placed point position, a people hand steered instrument handle, so that feeler lever is kept vertically, a people lifts and drops hammer to guiding
Masthead end, then unclamps, and is allowed to into freely falling body；
2-2) read depth of penetration, every injection 10mm reads a number, record blow counts and injection amount；
2-3) continuous hammering, measurement, until the structure layer depth needing；When material layer is hard, injection amount is low to hammer 10 to continuous
When secondary and unchanged, stop test or boring and continue test by rear；
2-4) will drop hammer and remove, take dcp instrument from test pit away.
4. the low method filling out shallow cut roadbed natural foundation bearing capacity of quick detection according to claim 3 it is characterised in that
Described step 2-2) in, for pellet class basic unit, every 5-10 hammering reading is once；For soft structure sheaf, every 1-2 hammer
Hit reading once.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109632217A (en) * | 2018-10-25 | 2019-04-16 | 重庆交通大学 | Pavement structure bearing capacity continuous detecting method |
| CN111965060A (en) * | 2020-08-03 | 2020-11-20 | 河海大学 | Press-in type on-site modulus of resilience measuring device |
| CN112267464A (en) * | 2020-10-19 | 2021-01-26 | 李蓬 | Intelligent protection system for reconstructing and expanding highway slope |
| CN115125783A (en) * | 2022-05-27 | 2022-09-30 | 郑州大学 | Method and device for preventing and controlling frost heaving, thawing sinking and grouting of pumped frozen soil highway subgrade thawing plate |
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| CN109632217A (en) * | 2018-10-25 | 2019-04-16 | 重庆交通大学 | Pavement structure bearing capacity continuous detecting method |
| CN109632217B (en) * | 2018-10-25 | 2020-10-13 | 重庆交通大学 | Continuous detection method for bearing capacity of pavement structure |
| CN111965060A (en) * | 2020-08-03 | 2020-11-20 | 河海大学 | Press-in type on-site modulus of resilience measuring device |
| CN112267464A (en) * | 2020-10-19 | 2021-01-26 | 李蓬 | Intelligent protection system for reconstructing and expanding highway slope |
| CN115125783A (en) * | 2022-05-27 | 2022-09-30 | 郑州大学 | Method and device for preventing and controlling frost heaving, thawing sinking and grouting of pumped frozen soil highway subgrade thawing plate |
| CN115125783B (en) * | 2022-05-27 | 2023-08-04 | 郑州大学 | Method and device for preventing and controlling frost heaving, thawing, settlement and grouting of water pumping type frozen soil highway subgrade thawing plate |
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