CN105672372B - Method for determining compaction degree of embankment filled with earth after dynamic compaction according to compaction settlement - Google Patents
Method for determining compaction degree of embankment filled with earth after dynamic compaction according to compaction settlement Download PDFInfo
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- CN105672372B CN105672372B CN201610036875.6A CN201610036875A CN105672372B CN 105672372 B CN105672372 B CN 105672372B CN 201610036875 A CN201610036875 A CN 201610036875A CN 105672372 B CN105672372 B CN 105672372B
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- 238000005056 compaction Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000002689 soil Substances 0.000 claims abstract description 21
- 230000002787 reinforcement Effects 0.000 claims abstract description 11
- 238000012360 testing method Methods 0.000 claims description 16
- 230000005484 gravity Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 11
- 238000001514 detection method Methods 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 5
- 230000003014 reinforcing effect Effects 0.000 abstract description 3
- 238000007596 consolidation process Methods 0.000 description 7
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 238000009705 shock consolidation Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a method for determining the compaction degree of embankment filled with earth after dynamic compaction according to the ramming settlement, which can quickly obtain the average compaction degree of the embankment on site and further evaluate the reinforcing effect after dynamic compaction. Firstly simplifying a reinforcing mode of dynamic compaction into a cylindrical shape, and then determining the dynamic compaction influence depth H of the on-site embankment and the diameter L of the dynamic compaction influence range; thus calculating the volume V influenced by dynamic compaction and tamping; then adopting a sample of filling soil before tamping of the embankment, and calculating the compaction degree of the embankment on site before dynamic tamping; and after the dynamic compaction is detected on the field embankment, the depth of the rammed pit and the diameter of the rammer are calculated, so that the volume of the rammed pit is calculated. And then calculating the compaction degree according to the change of the volume of the filled soil before and after the tamping. The method for determining the compaction degree of the filled earth of the dynamic compaction rear embankment according to the tamping settlement improves the detection efficiency of the dynamic compaction reinforcement quality of the foundation, reduces the construction cost, can evaluate the reinforcement effect of the dynamic compaction in time and avoids repeated construction.
Description
Technical field
It is especially a kind of true according to ramming volume the present invention relates to a kind of evaluation method of forced ramming reinforcing embankment post-reinforcing effect
Determine the method for embankment fill compaction degree after strong rammer.
Background technology
It is known：High embankment is because weight stress is big, and stress level is high and sedimentation caused by itself compression of banketing is also larger,
Generally existing settles, particularly the uneven subsidence of embankment 2.Carried out when building high embankment 2 using heavy-tamping method at reinforcement
Reason, it is a kind of conventional engineering treatment to eliminate the sedimentation of embankment 2 in advance.
Detection work to compaction effect after strong rammer is an important component of dynamic consolidation construction, is used both at home and abroad at present
The dynamic feeler inspection of main method, loading test and wave velocity test, compactness detection etc., time-consuming for traditional test methods, expense
It is high.Simultaneously because strong rammer influence depth is larger, in-situ test can only provide a number of strengthening quality situation taken a sample test on a little,
Consolidation effect in whole strong rammer coverage can not be evaluated.The detection of compactness is typically derived from the table to banket after strong rammer
Face, it is impossible to embody the change of compactness in whole strong rammer coverage, the place of ramming of hammer ram 1 and do not ram the compactness difference at place compared with
Greatly, simultaneously because surface loosening of being banketed after strong rammer, compactness test is not very accurate.
The content of the invention
The technical problems to be solved by the invention are to provide one kind can quickly obtain the average compactness of embankment at the scene, enter
And evaluate the method that embankment fill compaction degree after strong rammer is determined according to ramming volume of the consolidation effect after strong rammer.
The technical solution adopted for the present invention to solve the technical problems is：Embankment filled soil pressure after strong rammer is determined according to ramming volume
The method of solidity, comprises the following steps：
1) reinforcement mode of strong rammer is reduced to cylinder, it is determined that live embankment strong rammer influence depth H, the influence model of strong rammer
The diameter L enclosed；Pass through formula V=H π L2/ 4, calculating strong rammer and ramming influences volume V；
2) embankment filled soil sample before live strong rammer is taken, tests the maximum dry density ρ to banketdmaxAnd the dry density ρ that banketsd；
According to formula：λc=ρd/ρdmaxDraw the compactness λ before embankment strong rammerc, and ensure to take the quantity of soil sample to meet quality of soil sample
Test request；
3) hammer ram diameter D is tested, strong rammer rams rear ramming volume h, tamping pit volume V '=h π D2/ 4, so as to obtain ramming rear body
Product V ",
4) the average compactness after strong rammer is rammed
Further, the Menard formula that the strong rammer influence depth H in step 1) passes through amendment：
Calculate and determine, or use《Building foundation treatment specification》In recommended value, or live Rayleigh wave test determine；Wherein M is
The gravity of hammer ram, unit K N；HFallFor hammer ram fall away from；Unit m；K is corrected parameter, and scope is 0.35~0.8.
Further, the diameter L of the coverage of the strong rammer in step 1) takes 1.5~2.5 times of hammer ram diameter D.
The beneficial effects of the invention are as follows：The side of the present invention that embankment fill compaction degree after strong rammer is determined according to ramming volume
Method, the reinforcement mode of strong rammer is reduced to cylinder first, it is then determined that live embankment strong rammer influence depth H, strong rammer influence
The diameter L of scope；So as to calculate the volume V that strong rammer rams influence；Then the sample that bankets before the ramming of embankment is taken, is calculated
Compactness before live embankment strong rammer；After detecting strong rammer on embankment at the scene again, the depth of tamping pit and the diameter of hammer ram, so as to
Calculate the volume of tamping pit.Then basis rams the front and rear change for ramming rear volume and calculates compactness.By of the present invention
The method that embankment fill compaction degree after strong rammer is determined according to ramming volume, after directly can quickly obtaining live embankment strong rammer
Compactness；So that by the degree of compression after live strong rammer compared with the compactness that strong rammer requires, after can interpolate that strong rammer
Whether consolidation effect reaches requirement, ensures the consolidation effect of strong rammer.Therefore it is of the present invention strong rammer is determined according to ramming volume after
The method of embankment filled soil compactness, improve foundation dynamic consolidation strengthening quality detection efficiency, reduce construction cost, can and the news commentary
The consolidation effect of valency strong rammer, avoid repeating to construct.
Brief description of the drawings
Fig. 1 is the schematic diagram that hammer ram is rammed in the embodiment of the present invention；
Fig. 2 is the stream that the method for embankment fill compaction degree after strong rammer is determined according to ramming volume described in the embodiment of the present invention
Cheng Tu；
Fig. 3 is ramming times and the graph of a relation of compactness in the embodiment of the present invention；
Indicated in figure：1- hammer rams, 2- embankments.
Embodiment
The present invention is further described with reference to the accompanying drawings and examples.
As shown in Figure 1 and Figure 2, the method for the present invention that embankment fill compaction degree after strong rammer is determined according to ramming volume, including
Following steps：
1) reinforcement mode of strong rammer is reduced to cylinder, it is determined that live embankment 2 strong rammer influence depth H, strong rammer influence
The diameter L of scope；Pass through formula V=H π L2/ 4, calculating strong rammer and ramming influences volume V；
2) embankment filled soil sample before live strong rammer is taken, tests the maximum dry density ρ to banketdmaxAnd the dry density ρ that banketsd；
According to formula：λc=ρd/ρdmaxDraw the compactness λ before the strong rammer of embankment 2c, and ensure to take the quantity of soil sample to meet quality of soil sample
Test request；
3) hammer ram diameter D is tested, strong rammer rams rear ramming volume h, tamping pit volume V '=h π D2/ 4, so as to obtain ramming rear body
Product V ",
4) the average compactness after strong rammer is rammed
Due to the reinforcement mode of strong rammer is reduced into cylinder first in step 1), therefore by determining live embankment 2
Strong rammer influence depth H, strong rammer coverage diameter L；After determining that scene carries out strong rammer to embankment 2, banket
Being rammed by strong rammer influences volume V, V=H π L2/4。
Specifically, the live strong rammer influence depth H of embankment 2, the diameter L of coverage of strong rammer are typically all in step 1)
First by determining the tamping energy P of each strong rammer, then determined again by the tamping energy P of each strong rammer.Each strong rammer
Tamping energy P, mainly ram what be can determine that by set hammer ram 1.Strong rammer influence depth H in step 1) passes through amendment
Menard formula：Calculate and determine, or use《Building foundation treatment specification》In recommended value, or
Live Rayleigh wave test determines；Wherein M be hammer ram 1 gravity, unit K N；HFallFor hammer ram 1 fall away from；Unit m；K joins for amendment
Number, scope are 0.35~0.8.The diameter L of the coverage of the strong rammer takes 1.5~2.5 times of hammer ram diameter D, or passes through inspection
Survey and determine.
The sample that bankets before strong rammer is taken in step 2), calculates the compactness λ to be banketed before strong rammerc, so as to be follow-up step
It is ready in rapid by the compactness after Volume Changes calculating strong rammer.
By testing hammer ram diameter D in step 3), strong rammer rams rear ramming volume h, tamping pit volume V '=h π D2/ 4, so as to
Obtain ramming rear volume V ",Due to the volume after the strong rammer that obtained banketing in step 3)
V″；So as to according to mass conservation law：Volume Changes of banketing after strong rammer, mass conservation, so as to fill out after calculating strong rammer
Filling's dry density.
By step 1), obtain 2) and in step 3) in step 4)：The strong rammer influence depth H of embankment 2, the shadow of strong rammer
Ring the compactness λ to be banketed before the diameter L of scope, strong rammerc, ram rear volume V ", carry out following derive：
Before strong rammer, the wet density ρ of embankment filled soil, moisture content w, then dry density of banketing are tested：
The compactness of embankment filled soil：
Ramming influences volume V=H π L2Quality of filling soil in the range of/4 is：
M=ρ V (3)
Volume is changed into V " after strong rammer, and strong rammer process 2 moisture content of embankment are constant, the wet density after strong rammer：
Dry and wet density after strong rammer：
Compactness after strong rammer:
According to the above-mentioned average compactness being derived by after strong rammer is rammedTherefore in step
It is rapid 4) in the average compactness λ after ramming directly is calculated by formulac′。
In summary, the method for the present invention that embankment fill compaction degree after strong rammer is determined according to ramming volume, first will
The reinforcement mode of strong rammer is reduced to cylinder, it is then determined that the diameter of the coverage of live embankment strong rammer influence depth H, strong rammer
L；So as to calculate the volume V that strong rammer rams influence；Then the sample that bankets before the ramming of embankment is taken, it is strong to calculate live embankment
Compactness before rammer；After detecting strong rammer on embankment at the scene again, the depth of tamping pit and the diameter of hammer ram, so as to calculate tamping pit
Volume.Then basis rams the front and rear change for ramming rear volume and calculates compactness.By of the present invention heavy according to ramming
The method that amount determines embankment fill compaction degree after strong rammer, directly can quickly obtain the compactness after live embankment strong rammer；From
And by the degree of compression after live strong rammer compared with the compactness that strong rammer requires, it can interpolate that the consolidation effect after strong rammer is
It is no to reach requirement, ensure the consolidation effect of strong rammer.Therefore it is of the present invention that embankment filled soil pressure after strong rammer is determined according to ramming volume
The method of solidity, foundation dynamic consolidation strengthening quality detection efficiency is improved, reduces construction cost, adding for strong rammer can be evaluated in time
Gu effect, avoid repeating to construct.
Embodiment
Reference picture 1, Fig. 2 and Fig. 3 illustrate average compactness really with reference to the high embankment strong rammer work point of certain municipal works
Determine process.The high 20m of the high embankment of certain municipal works, embankment filled soil is the mud stone of weathering, compactness 92% before embankment strong rammer reinforcement.By force
The tamping energy that is designed as ramming reinforcement is 6000KNm, hammer ram weight 30t, is fallen away from 20m, hammer ram diameter 2.5m.
With reference to specification, live R wave test and FEM calculation tamping energy be 6000KNm when, strong rammer influence depth
The Menard formula that H passes through amendment：The influence depth H that strong rammer is calculated is about 9m, the influence of strong rammer
The diameter L of scope is 2 times of hammer ram diameter D.Then the volume in hammer ram coverage is：
Ram listed by 6 following 1 tables of later accumulative sedimentation, according to the depth h of the tamping pit determined in table at scene；Then root
According to the average compactness of formulaRear compactness is rammed corresponding to obtaining；According to formula：V '=h π D2/
4 obtain tamping pit volume V '；According to formulaObtain ramming rear volume V "；It is compacted simultaneously
Degree is as shown in Figure 3 with ramming times relation curve.
Compactness changes after the strong rammer of table 1
| Ramming times | 1 | 2 | 3 | 4 | 5 | 6 |
| Tamping pit cumulative depth h (m) | 0.473 | 0.865 | 1.148 | 1.309 | 1.411 | 1.485 |
| Tamping pit volume V ' (m3) | 2.3 | 4.2 | 5.6 | 6.4 | 6.9 | 7.3 |
| Ram rear volume V " (m3) | 174.3 | 172.4 | 171.0 | 170.2 | 169.7 | 169.3 |
| Ram rear compactness λc′ | 0.932 | 0.943 | 0.950 | 0.955 | 0.958 | 0.960 |
It is described above simply explain through diagrams present invention determine that after strong rammer average compactness some principles and operating procedure,
Any formal limitation not is done to the present invention, any person skilled in the art, is not departing from the technology of the present invention side
In the range of case, when the technology contents using the disclosure above make a little change or are modified to the equivalence enforcement of equivalent variations
Example, as long as being the content without departing from technical solution of the present invention, what the technical spirit according to the present invention was made to above example appoints
What simple modification, equivalent change and modification, still fall within the scope of technical solution of the present invention.
Claims (3)
1. the method for embankment fill compaction degree after strong rammer is determined according to ramming volume, it is characterised in that comprise the following steps：
1) reinforcement mode of strong rammer is reduced to cylinder, it is determined that live embankment (2) strong rammer influence depth H, the influence model of strong rammer
The diameter L enclosed；Pass through formula V=H π L2/ 4, calculating strong rammer and ramming influences volume V；
2) embankment filled soil sample before live strong rammer is taken, tests the maximum dry density ρ to banketdmaxAnd the dry density ρ that banketsd；According to
Formula：λc=ρd/ρdmaxDraw the compactness λ before embankment (2) strong rammerc, and ensure to take the quantity of soil sample to meet quality of soil sample
Test request；
3) hammer ram diameter D is tested, strong rammer rams rear ramming volume h, tamping pit volume V '=h π D2/ 4, so as to obtain ramming rear volume V ",
4) before strong rammer, the wet density ρ of embankment filled soil, moisture content w, then dry density of banketing are tested：
The compactness of embankment filled soil：
Ramming influences volume V=H π L2Quality of filling soil in the range of/4 is：
M=ρ V (3)
Volume is changed into V " after strong rammer, and strong rammer process embankment (2) moisture content is constant, the wet density after strong rammer：
Dry and wet density after strong rammer：
Compactness after strong rammer:
The average compactness after strong rammer is rammed is obtained by formula (1), (2), (3), (4), (5), (6)
2. the method for embankment fill compaction degree after strong rammer is determined according to ramming volume as claimed in claim 1, it is characterised in that：Step
It is rapid 1) in the strong rammer influence depth H Menard formula that pass through amendment：Calculate and determine, or use《Build
Build basement process specification》In recommended value, or live Rayleigh wave test determine；Wherein M be hammer ram (1) gravity, unit kN；
HFallFor hammer ram (1) fall away from；Unit m；K is corrected parameter, and scope is 0.35~0.8.
3. the method for embankment fill compaction degree after strong rammer is determined according to ramming volume as claimed in claim 1, it is characterised in that：Step
It is rapid 1) in the diameter L of coverage of strong rammer take 1.5~2.5 times of hammer ram diameter D.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110512582A (en) * | 2019-08-22 | 2019-11-29 | 长安大学 | A kind of Subgrade Compaction layer detection method |
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| CN107063924A (en) * | 2017-04-21 | 2017-08-18 | 中水北方勘测设计研究有限责任公司 | A kind of method for being used to examine the roller compaction construction quality of impervious body containing over coarse grained soil |
| CN108333324B (en) * | 2017-12-22 | 2021-04-02 | 神华集团有限责任公司 | Treatment method for relieving frost heaving deformation of roadbed by using Poisson effect |
| CN108229050B (en) * | 2018-01-18 | 2021-07-13 | 华东交通大学 | Method for simply and conveniently calculating soil body reinforcing effect between adjacent tamping points under dynamic compaction action |
| CN113188513B (en) * | 2021-05-12 | 2022-08-23 | 中交疏浚技术装备国家工程研究中心有限公司 | Intelligent measurement and analysis system of high-speed hydraulic tamper |
| CN113235552B (en) * | 2021-05-27 | 2022-06-17 | 中交基础设施养护集团有限公司 | Method for filling roadbed by using large-diameter broken stone through dynamic compaction |
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| EP2963184A1 (en) * | 2014-07-04 | 2016-01-06 | Sol Solution | Heavy dynamic penetrometer and method for determining the height of the fall of a hammer belonging to such a penetrometer |
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| CN101255684B (en) * | 2008-02-19 | 2010-08-11 | 水利部交通部电力工业部南京水利科学研究院 | Construction method for filling and constructing earth stone dam by demixing dynamic compaction |
| CN202330214U (en) * | 2011-11-11 | 2012-07-11 | 西安长大公路养护技术有限公司 | Displacement-sensor-based real-time detection system for compaction degree of foundation |
| CN105160057B (en) * | 2015-07-08 | 2018-05-04 | 中北大学 | Utilize the method for ramming optimum moisture content under heavy energy level more same than definite constructing soil |
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| EP2963184A1 (en) * | 2014-07-04 | 2016-01-06 | Sol Solution | Heavy dynamic penetrometer and method for determining the height of the fall of a hammer belonging to such a penetrometer |
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| CN110512582A (en) * | 2019-08-22 | 2019-11-29 | 长安大学 | A kind of Subgrade Compaction layer detection method |
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