CN105220670A - A kind of Subgrade Compaction detection method - Google Patents
A kind of Subgrade Compaction detection method Download PDFInfo
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- CN105220670A CN105220670A CN201510598958.XA CN201510598958A CN105220670A CN 105220670 A CN105220670 A CN 105220670A CN 201510598958 A CN201510598958 A CN 201510598958A CN 105220670 A CN105220670 A CN 105220670A
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- subgrade compaction
- compaction
- subgrade
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Abstract
The invention discloses a kind of Subgrade Compaction detection method, be detect the analysis of Subgrade Compaction Experimental Comparison by on-the-spot portable dynamic penetration test and other, set up the corresponding relation formula of light-duty dynamic spy blow counts and degree of compaction; Adopt light dynamic penetration test method to carry out complete detection to large area Embankment Compaction degree again, record the light-duty dynamic spy blow counts of each measuring point, by the corresponding relation formula of the light-duty dynamic spy blow counts set up and degree of compaction, calculate the Subgrade Compaction of each measuring point.The method makes Subgrade Compaction testing become easier, quick, and sense cycle is short, expense is low, little to filling roadbed destruction in testing process, and applied widely.
Description
[technical field]
The present invention relates to Subgrade Compaction detection technique field, be specifically related to a kind of Subgrade Compaction detection method.
[background technology]
Soil stone class mixed material is filling roadbed has that consolidation effect is good, sedimentation is little, good water permeability, shock resistance are high, intensity is high, the advantage such as convenient of drawing materials, and is at home and abroad widely used in constructing highway.
Degree of compaction is one of key index of subgrade and pavement detection of construction quality, characterize the closely knit situation after field compaction, the standard density (maximum dry density) that laboratory test draws and water content are a reference values of degree of compaction evaluation, directly decide the reliability of evaluation result.The in-situ check and test method of degree of compaction mainly contains sand replacement method, core cutter method, douche, nuclear moisture and density meter method etc.
The drawback of above-mentioned several test is that the scope of application is little, costly, workload is large, speed is slow, the cycle is long, destroys large to existing roadbed.When particularly the filled soils of roadbed deep layer being detected, larger test pit need be dug, cause new roadbed hidden danger.
[summary of the invention]
For solving problems of the prior art, the invention provides a kind of new Subgrade Compaction detection method, the method makes Subgrade Compaction testing become easier, quick, and sense cycle is short, expense is low, little to filling roadbed destruction in testing process, and applied widely.
For achieving the above object, the present invention adopts following technological means:
A kind of Subgrade Compaction detection method, comprises the following steps:
Step 1: in embankment job site, chooses a slice foundation soil region to be checked, random selecting testing site, adopts sand replacement method or douche to detect Subgrade Compaction, and records data;
Step 2: near location survey point selected by step 1, chooses another measuring point and carries out portable dynamic penetration test, record blow counts, and to record data corresponding with above-mentioned steps 1;
Step 3: repeat above-mentioned two steps, record and organize corresponding data more, rejecting abnormalities data, choose representative data, carry out numerical analysis, set up the relational expression of dynamic sounding blow counts and Subgrade Compaction;
Step 4: the light-duty dynamic spy blow counts detecting embankment job site foundation soil, brings above-mentioned steps 3 gained relational expression into, can draw the Subgrade Compaction of this embankment job site.
As a further improvement on the present invention, described relational expression is as follows:
K＝aX
2+bX+c；(1)
K＝aX
4+bX
3+cX
2+dX+e(2)
K＝a*sin(bX+c)+d*sin(fX+h)(3)
K＝aX
b+c(4)
K＝a*exp(bX)+c*exp(dX)(5)
Above-mentioned various in, K is Subgrade Compaction, and X is light-duty dynamic spy blow counts, and a, b, c, d, f, h are respectively the coefficient in each relational expression.
As a further improvement on the present invention, also verification step is comprised:
Choose 10 place's measuring points, step 3 equation is verified, first carry out portable dynamic penetration test, calculate Subgrade Compaction, measuring point is chosen again near corresponding measuring point, adopt sand replacement method or douche to detect degree of compaction, contrast with calculating gained, the result carry out step 4 again in error range.
As a further improvement on the present invention, described portable dynamic penetration test tests according to " circular cone dynamic sounding testing regulation ".
As a further improvement on the present invention, the borehole degree of depth 30cm of described sand replacement method or douche.
As a further improvement on the present invention, in described step 2, refer within the scope of selected measuring point 1.0m near location survey point selected by step 1.
As a further improvement on the present invention, the data group number surveyed in described step 3 is no less than 100 groups.
Relatively and prior art, the present invention has the following advantages:
A kind of Subgrade Compaction detection method of the present invention, is detect the analysis of Subgrade Compaction Experimental Comparison by on-the-spot portable dynamic penetration test and other, sets up the corresponding relation formula of light-duty dynamic spy blow counts and degree of compaction; Adopt light dynamic penetration test method to carry out complete detection to large area Embankment Compaction degree again, record the light-duty dynamic spy blow counts of each measuring point, by the corresponding relation formula of the light-duty dynamic spy blow counts set up and degree of compaction, calculate the Subgrade Compaction of each measuring point.Adopt the compaction detect that native stone class mixed material is filling roadbed, adopt the degree of compaction of this kind of method evaluation roadbed, both can not cause the destruction of the element body that satisfies the need, what darker roadbed can be detected again rolls quality, and effective and rapid.This makes method detection Subgrade Compaction workload greatly reduce, and detection method is easy to grasp, handled easily, and detection speed is fast, less on programming impact.This detection method applicability is wide, is affected by human factors little.This detection method is little for the compaction detect error that native stone class mixed material is filling roadbed, and precision is high, and has very strong practicality, significantly can simplify testing process, and detection efficiency is largely increased.
[accompanying drawing explanation]
Fig. 1 is the curve map of the first Subgrade Compaction and blow counts;
Fig. 2 is the curve map of the second Subgrade Compaction and blow counts;
Fig. 3 is the curve map of the third Subgrade Compaction and blow counts;
Fig. 4 is the curve map of the 4th kind of Subgrade Compaction and blow counts;
Fig. 5 is the curve map of the 5th kind of Subgrade Compaction and blow counts.
[detailed description of the invention]
Below in conjunction with the drawings and specific embodiments, the present invention will be further described, the invention is not restricted to following examples.
The first step: in embankment job site, chooses a slice foundation soil region to be checked, random selecting testing site, and adopt sand replacement method or douche to detect Subgrade Compaction, the data obtained carries out record.
Second step: be guarantee test result accuracy, near location survey point selected by above-mentioned steps, chooses another measuring point and carries out portable dynamic penetration test, record blow counts, corresponding with above-mentioned steps record data.
So-called portable dynamic penetration test, refer to the test method of regulation in " circular cone dynamic sounding testing regulation ", concrete steps are:
1, pop one's head in before injection soil layer, on sounding rod, first mark the position of upwards every 30cm from cone point;
2, a people is by vertical for sounding rod righting, and 10Kg punching hammer puts down from the above 50cm freely falling body of pallet end face by another people, and hammering speed is hit with 15-30 per minute and is advisable;
3, the blow counts N10 ' (hitting/30cm) of every injection soil layer 30cm is recorded.
3rd step: repeat above-mentioned two steps, record 110 groups of corresponding datas, rejecting abnormalities data, choose 100 groups of representative data, data as shown in Figures 1 to 5 carry out numerical analysis, set up the relationship of dynamic sounding blow counts-Subgrade Compaction.
By Tu Ke get, when Subgrade Compaction is higher, dynamic spy blow counts is comparatively large, on the contrary, if Subgrade Compaction is low, then dynamic spy is hit several less, there is certain mathematical relationship therebetween, by mathematical software, the data obtained is analyzed, just can be drawn this relational expression
The relational expression obtained respectively by Fig. 1 to Fig. 5 is as follows:
K＝aX
2+bX+c；(1)
K＝aX
4+bX
3+cX
2+dX+e(2)
K＝a*sin(bX+c)+d*sin(fX+h)(3)
K＝aX
b+c(4)
K＝a*exp(bX)+c*exp(dX)(5)
Above-mentioned various in, K is Subgrade Compaction, and X is light-duty dynamic spy blow counts, and a, b, c, d, f, h are respectively the coefficient in each relational expression.
4th step: for guaranteeing the reliability of testing result, first relational expression is verified.Choose 10 place's measuring points, above-mentioned relation formula is verified, first carry out portable dynamic penetration test, calculate Subgrade Compaction.Near corresponding measuring point, choose measuring point again, adopt sand replacement method to detect degree of compaction, contrast with calculating gained, the result reliability.
5th step: the light-duty dynamic spy blow counts detecting embankment job site foundation soil, brings in above-mentioned steps gained relationship, draws the Subgrade Compaction of this embankment job site.
The principle of the invention is simple, test data precise and high efficiency, can guide field construction exactly.
Below in conjunction with the data and curves of different situations, simulate corresponding relational expression, as follows:
Embodiment 1
K＝-4.48×10
-3x
2+0.76x+70.82
Embodiment 2
K＝-1.484×10
-7X
4+1.963×10
-4X
3-0.0366X
2+2.377X+46.68
Embodiment 3
K＝307.6sin(0.0093X-0.2423)+128.3sin(0.02143X+1.839)
Embodiment 4
K＝-2359X
-1.53+103.5
Embodiment 5
K＝93.24exp(0.00089X)-177.5exp(-0.1196X)
Above-mentioned various in: K---Subgrade Compaction;
X---light dynamic penetration test method blow counts (30cm)
Empirical tests, above-mentioned formula gained degree of compaction and sand replacement method gained degree of compaction error are all less than 5%.Can promote.
Claims (7)
1. a Subgrade Compaction detection method, is characterized in that, comprises the following steps:
Step 1: in embankment job site, chooses a slice foundation soil region to be checked, random selecting testing site, adopts sand replacement method or douche to detect Subgrade Compaction, and records data;
Step 2: near location survey point selected by step 1, chooses another measuring point and carries out portable dynamic penetration test, record blow counts, and to record data corresponding with above-mentioned steps 1;
Step 3: repeat above-mentioned two steps, record and organize corresponding data more, rejecting abnormalities data, choose representative data, carry out numerical analysis, set up the relational expression of dynamic sounding blow counts and Subgrade Compaction;
Step 4: the light-duty dynamic spy blow counts detecting embankment job site foundation soil, brings above-mentioned steps 3 gained relational expression into, can draw the Subgrade Compaction of this embankment job site.
2. a kind of Subgrade Compaction detection method according to claim 1, it is characterized in that, described relational expression is as follows:
K＝aX
2+bX+c；(1)
K＝aX
4+bX
3+cX
2+dX+e(2)
K＝a*sin(bX+c)+d*sin(fX+h)(3)
K＝aX
b+c(4)
K＝a*exp(bX)+c*exp(dX)(5)
Above-mentioned various in, K is Subgrade Compaction, and X is light-duty dynamic spy blow counts, and a, b, c, d, f, h are respectively the coefficient in each relational expression.
3. a kind of Subgrade Compaction detection method according to claim 1, is characterized in that, also comprise verification step:
Choose 10 place's measuring points, step 3 equation is verified, first carry out portable dynamic penetration test, calculate Subgrade Compaction, measuring point is chosen again near corresponding measuring point, adopt sand replacement method or douche to detect degree of compaction, contrast with calculating gained, the result carry out step 4 again in error range.
4. a kind of Subgrade Compaction detection method according to claim 1, is characterized in that, described portable dynamic penetration test tests according to " circular cone dynamic sounding testing regulation ".
5. a kind of Subgrade Compaction detection method according to claim 1, is characterized in that, the borehole degree of depth 30cm of described sand replacement method or douche.
6. a kind of Subgrade Compaction detection method according to claim 1, is characterized in that, in described step 2, refers within the scope of selected measuring point 1.0m near location survey point selected by step 1.
7. a kind of Subgrade Compaction detection method according to claim 1, is characterized in that, the data group number surveyed in described step 3 is no less than 100 groups.
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Cited By (13)
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|---|---|---|---|---|
| CN105780751A (en) * | 2016-03-02 | 2016-07-20 | 长安大学 | Method and device for real-time online detection of compactness |
| CN107190721A (en) * | 2017-07-13 | 2017-09-22 | 福建省永正工程质量检测有限公司 | A kind of dynamic sounding method for replacing sand replacement method to detect compactness with foundation bearing capacity |
| CN108396723A (en) * | 2018-01-31 | 2018-08-14 | 甘肃省交通规划勘察设计院股份有限公司 | A kind of highway subgrade compaction quality rapid detection method |
| CN108570909A (en) * | 2018-05-15 | 2018-09-25 | 西南交通大学 | A kind of Extra-fine sand roadbed fills debulking methods |
| CN108867604A (en) * | 2018-04-04 | 2018-11-23 | 中交第三公路工程局有限公司 | A kind of gangue Subgrade Compaction detection method and detection device |
| CN109137648A (en) * | 2018-10-25 | 2019-01-04 | 中铁二十局集团有限公司 | Overlay ballast bed detection methods of compaction degree |
| CN109142108A (en) * | 2018-08-03 | 2019-01-04 | 天津大学 | Method based on the native relative compaction of portable dynamic penetration test metrics evaluation quartz |
| CN109283314A (en) * | 2018-08-03 | 2019-01-29 | 天津大学 | Method based on portable dynamic penetration test metrics evaluation calcium soil relative compaction |
| CN109797729A (en) * | 2019-01-30 | 2019-05-24 | 中水电第十一工程局（郑州）有限公司 | A kind of roadbed brick slag changes packing course compactness and refers to object detection method |
| CN110512582A (en) * | 2019-08-22 | 2019-11-29 | 长安大学 | A kind of Subgrade Compaction layer detection method |
| CN110725298A (en) * | 2019-10-23 | 2020-01-24 | 长安大学 | Roadbed layered compaction degree real-time monitoring method based on peak acceleration of rammer |
| CN112301992A (en) * | 2020-10-16 | 2021-02-02 | 西安工程大学 | Nondestructive testing method for foundation soil compactness |
| CN113029859A (en) * | 2021-03-22 | 2021-06-25 | 海南省交通工程检测中心 | Method for rapidly detecting compaction degree of roadbed and pavement |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105780751A (en) * | 2016-03-02 | 2016-07-20 | 长安大学 | Method and device for real-time online detection of compactness |
| CN105780751B (en) * | 2016-03-02 | 2017-11-10 | 长安大学 | A kind of compactness real-time on-line detecting method and device |
| CN107190721A (en) * | 2017-07-13 | 2017-09-22 | 福建省永正工程质量检测有限公司 | A kind of dynamic sounding method for replacing sand replacement method to detect compactness with foundation bearing capacity |
| CN108396723A (en) * | 2018-01-31 | 2018-08-14 | 甘肃省交通规划勘察设计院股份有限公司 | A kind of highway subgrade compaction quality rapid detection method |
| CN108867604A (en) * | 2018-04-04 | 2018-11-23 | 中交第三公路工程局有限公司 | A kind of gangue Subgrade Compaction detection method and detection device |
| CN108570909A (en) * | 2018-05-15 | 2018-09-25 | 西南交通大学 | A kind of Extra-fine sand roadbed fills debulking methods |
| CN109283314A (en) * | 2018-08-03 | 2019-01-29 | 天津大学 | Method based on portable dynamic penetration test metrics evaluation calcium soil relative compaction |
| CN109142108A (en) * | 2018-08-03 | 2019-01-04 | 天津大学 | Method based on the native relative compaction of portable dynamic penetration test metrics evaluation quartz |
| CN109142108B (en) * | 2018-08-03 | 2021-04-27 | 天津大学 | Method for evaluating relative compactness of quartz soil based on light dynamic penetration test indexes |
| CN109137648A (en) * | 2018-10-25 | 2019-01-04 | 中铁二十局集团有限公司 | Overlay ballast bed detection methods of compaction degree |
| CN109797729A (en) * | 2019-01-30 | 2019-05-24 | 中水电第十一工程局（郑州）有限公司 | A kind of roadbed brick slag changes packing course compactness and refers to object detection method |
| CN109797729B (en) * | 2019-01-30 | 2020-11-10 | 中电建十一局工程有限公司 | Detection method for roadbed brick slag filling layer replacement compactness index |
| CN110512582A (en) * | 2019-08-22 | 2019-11-29 | 长安大学 | A kind of Subgrade Compaction layer detection method |
| CN110725298A (en) * | 2019-10-23 | 2020-01-24 | 长安大学 | Roadbed layered compaction degree real-time monitoring method based on peak acceleration of rammer |
| CN112301992A (en) * | 2020-10-16 | 2021-02-02 | 西安工程大学 | Nondestructive testing method for foundation soil compactness |
| CN113029859A (en) * | 2021-03-22 | 2021-06-25 | 海南省交通工程检测中心 | Method for rapidly detecting compaction degree of roadbed and pavement |
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