CN105544335A - Construction method for filling and compacting thick-layer aeolian sand subgrade - Google Patents
Construction method for filling and compacting thick-layer aeolian sand subgrade Download PDFInfo
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- CN105544335A CN105544335A CN201610075388.0A CN201610075388A CN105544335A CN 105544335 A CN105544335 A CN 105544335A CN 201610075388 A CN201610075388 A CN 201610075388A CN 105544335 A CN105544335 A CN 105544335A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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Abstract
The invention relates to a construction method for filling and compacting a thick-layer aeolian sand subgrade. An aeolian sand subgrade of a road with relatively high dune and relatively large wave can not be filled according to the layer thickness specified by 'guide'. The method provided by the invention comprises the following steps: controlling the layered loose paving total thickness of thick-layer aeolian sand to be 60-100cm; enabling the excess width of two sides of the aeolian sand subgrade to be not less than 50cm, and compacting the side subgrade; impregnating subgrade filler by adopting a watering or square immersing mode; and compacting the subgrade by combining weak vibration and strong vibration, wherein high-frequency low-amplitude strong vibration is adopted for the first layer and a top surface is rolled once by adopting a static pressure method, low-frequency high-amplitude strong vibration is adopted for the second layer and the previous layer, and the aeolian sand compacting method the same as that of the first layer is adopted for the uppermost layer. The construction method for filling and compacting the thick-layer aeolian sand subgrade, provided by the invention, effectively overcomes the defects of the compacting method in the existing 'guide', and the construction method can better adapt to on-site construction environments and practical situations, thereby increasing the construction speed and ensuring the construction quality.
Description
Technical field
The invention belongs to transport development technical field, be specifically related to a kind of thick-layer wind-blown sand fill subgrade compacting construction method.
Background technology
" Desert Highway direction of design and construction " (JTG/TD31-2008) points out, and " embankment adopts horizontal slice to fill mode; push away according to cross section overall with when filling and build; determine to fill and compacted depth according to the tonnage of road roller, every layer of average thickness 30 ~ 50cm." roll utilization because Highway Subgrade in Desert fills generally to be pushed away to fill out in route both sides or one-sided sand dune nearby; the section of, big rise and fall higher for sand dune; the lift height that wind-blown sand fill subgrade cannot specify according to " guide " fills; roadbed is disposable to be pushed away and fill out with compacted depth comparatively large, and thick-layer drift-sand debulking methods becomes puzzlement construction and affects a technical barrier of construction quality.
Summary of the invention
The object of this invention is to provide a kind of thick-layer wind-blown sand fill subgrade compacting construction method, individual layer loose laying depth can reach 60-100cm, and through case history checking, degree of compaction can meet design requirement, and debulking methods and site operation environment, feature adapt.
The technical solution adopted in the present invention is:
Thick-layer wind-blown sand fill subgrade compacting construction method, is characterized in that:
Thick-layer drift-sand layering pine paving gross thickness controls at 60cm ~ 100cm; Drift-sand embankment both sides ultra-wide is not less than 50cm, edge Highway Embankment Compaction;
Specifically realized by following steps:
Step one: adopt watering or enclose grid immersion mode and to drench roadbed filling, soaks with bottom filling and is as the criterion; After filler has been sprinkled water, end face can carry out leveling without obvious ponding and roll; Roller compaction construction completes in latter 2 hours in watering;
Step 2: the mode that Highway Embankment Compaction adopts weak compacting of shaking and shake by force to combine:
First floor drift-sand Embankment Compaction Quality employing high frequency short arc is weak to shake, and vibroroller cmpacting pass is 2-3 time, and after first floor vibroroller cmpacting completes, embankment end face adopts static pressure method to roll one time;
Fill the second layer and more top drift-sand embankment, the second layer and more top drift-sand Embankment Compaction Quality adopt low frequency high amplitude to shake by force, and the second layer and the more top drift-sand low frequency high amplitude pass that shakes by force is 3-5 time;
The superiors' drift-sand debulking methods is with first floor drift-sand debulking methods.
In step 2, before last layer filler paves, the embankment end face of the lower one deck of reply compacting spills permeable.
In step 2, roll order for first low rear height, first in the middle of two rear flank; Rolling speed is no more than 6km/h, and employing runs at a low speed.
The present invention has the following advantages:
Thick-layer wind-blown sand fill subgrade compacting construction method provided by the present invention, efficiently solve the deficiency of existing " guide " debulking methods, this construction method can adapt with site operation environment and actual conditions preferably, improves speed of application, ensure that construction quality.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention will be described in detail.
The thick-layer wind-blown sand fill subgrade compacting construction method that the present invention relates to, thick-layer drift-sand layering loose laying depth controls to be advisable with 60cm ~ 80cm, and maximum gauge is no more than 100cm, and loose laying depth should not be crossed thin or blocked up; Drift-sand embankment both sides answer ultra-wide to be not less than 50cm, to ensure the compacting of edge embankment.
Specifically realized by following steps:
Step one: adopt watering or enclose grid immersion mode and to drench roadbed filling, soaks with bottom filling and is as the criterion; After filler has been sprinkled water, end face can carry out leveling without obvious ponding and roll; Roller compaction construction completes in latter 2 hours in watering.If after filler watering, fail to carry out roller compaction construction in official hour, should carry out before filler rolls supplementing watering, during to guarantee that filler rolls, its moisture content is more than or equal to optimum moisture content, and moisture control should be unsuitable little greatly.
Step 2: the mode that Highway Embankment Compaction adopts weak compacting of shaking and shake by force to combine:
First floor drift-sand Embankment Compaction Quality employing high frequency short arc is weak to shake, and vibroroller cmpacting pass is 2-3 time, and after first floor vibroroller cmpacting completes, embankment end face adopts static pressure method to roll one time;
Fill the second layer and more top drift-sand embankment, the second layer and more top drift-sand Embankment Compaction Quality adopt low frequency high amplitude to shake by force, and the second layer and the more top drift-sand low frequency high amplitude pass that shakes by force is 3-5 time.Object is the secondary compaction effect playing drift-sand, layering drift-sand Embankment Compaction Quality, when filling the second layer or more top, for lower floor's drift-sand, due to filling of upper strata drift-sand, correspondingly increase the lateral restriction of lower floor's drift-sand, lower floor's drift-sand is more easy to get compacted compacting; In addition, because drift-sand is without " crust layer " stress spread effect, Compaction Effort can be delivered to lower floor's embankment significantly, and while rolling upper strata embankment, lower floor's embankment have also been obtained secondary compaction, i.e. the secondary compaction effect of drift-sand.Compacting machinary amplitude is larger, exciting force is larger, compacting counting and the compacting number of plies more, secondary compaction effect is more obvious.For giving full play to the secondary compaction effect of drift-sand, if when embankment layering (>=2 layers) is filled, before last layer filler paves, the embankment end face of the lower one deck of reply compacting spills permeable, and paves to upper strata filler, sprinkle water and roll in time.Roll order for first low rear height, first in the middle of two rear flank; Rolling speed is no more than 6km/h, adopts as far as possible and comparatively runs at a low speed;
The superiors' (top layer) drift-sand debulking methods is with first floor drift-sand debulking methods.
Drift-sand compacting, after reaching the number of rolling of regulation, answers layered weighting degree of compaction, and detection method can adopt sand replacement method, layered weighting thickness 15cm.For improving detection speed and efficiency, also degree of compaction can be set up
with light dynamic penetration test blow counts N
10-15and the dependency relation formula detected between degree of depth h, adopt the method for dynamic sounding to detect degree of compaction fast.
Specific operation process is:
1) the fluctuating section, sand dune selecting 3 places different is as test section, and 3 place's test section embankment layering loose laying depths are respectively 60cm, 80cm and 100cm, and embankment divides three layers of making compacting.
2) embankment both sides answer ultra-wide to be not less than 50cm, to ensure the compacting of edge embankment.
3) adopt watering or enclose the modes such as grid immersion and to drench roadbed filling, soak with bottom filling and be as the criterion.After filler has been sprinkled water, end face can carry out leveling without obvious ponding and roll.Roller compaction construction should complete in latter 2 hours in watering.If after filler watering, fail to carry out roller compaction construction in official hour, should carry out before filler rolls supplementing watering, during to guarantee that filler rolls, its moisture content is more than or equal to optimum moisture content, and moisture control should be unsuitable little greatly.
4) Highway Embankment Compaction adopts the mode that weak compacting of shaking and shake by force combines, that is: first floor drift-sand Embankment Compaction Quality employing high frequency short arc is weak shakes, and the on-the-spot vibration parameters of specific embodiment is frequency 33HZ, amplitude 0.93mm, exciting force 255KN, vibroroller cmpacting pass is 3 times.After first floor vibroroller cmpacting completes, embankment end face adopts static pressure method to roll one time.
5) pine paving fills second layer drift-sand embankment, and second layer drift-sand Embankment Compaction Quality adopts low frequency high amplitude to shake by force, and the on-the-spot vibration parameters of specific embodiment is frequency 28HZ, and amplitude 1.86mm, exciting force 370KN, the pass that shakes by force is 3 times.
6) the superiors' (top layer) drift-sand debulking methods is with first floor drift-sand debulking methods.
7) for giving full play to the secondary compaction effect of drift-sand, when filling, before last layer filler paves, the embankment end face of the lower one deck of reply compacting spills permeable, and paves to upper strata filler, sprinkle water and roll in time.
8) the general first low rear height of order is rolled, first in the middle of two rear flank; Rolling speed is no more than 6km/h, adopts as far as possible and comparatively runs at a low speed.
9) drift-sand compacting is after reaching the number of rolling of regulation, answers layered weighting degree of compaction, and detection method adopts sand replacement method, layered weighting thickness 15cm.
Specific embodiment:
Test site is positioned at the domestic Tengger desert desert-crossing highway in the Inner Mongol, is Class III highway, and Highway Embankment Compaction degree requires >=92%.Field sampling determination drift-sand particle forms.Adopt the standard density of on-the-spot making Experiment Road and chamber internal surface vibratory drilling method determination drift-sand.After drift-sand embankment has rolled according to the method described above, the on-the-spot sand replacement method that adopts carries out compaction detect.The result of compactness test shown in this example is testing result after the vibratory compaction of third layer (top layer) drift-sand embankment, answers the unconsolidated formation that desurfacing 0-15cm is thick during detection.As can be seen from the test results, institute's detection layers degree of compaction is all greater than 92%, meets design requirement.
Embodiment 1:
Drift-sand grading analysis result and compaction detect the results are shown in Table 1 and table 2.
Drift-sand sample, being greater than 0.25mm granule content is 40.6%, and being greater than 0.075mm granule content is 99.6%, and drift-sand is fine sand.
Embodiment 2:
Drift-sand grading analysis result and compaction detect the results are shown in Table 3 and table 4.
Drift-sand grading analysis result, being greater than 0.25mm granule content is 12.6%, and being greater than 0.075mm granule content is 98.6%, and drift-sand is fine sand.
Embodiment 3:
Drift-sand grading analysis result and compaction detect the results are shown in Table 5 and table 6.
Drift-sand grading analysis result, being greater than 0.25mm granule content is 2.8%, and being greater than 0.075mm granule content is 96.5%, and drift-sand is fine sand.
Content of the present invention is not limited to cited by embodiment, and the conversion of those of ordinary skill in the art by reading manual of the present invention to any equivalence that technical solution of the present invention is taked, is claim of the present invention and contains.
Claims (3)
1. thick-layer wind-blown sand fill subgrade compacting construction method, is characterized in that:
Thick-layer drift-sand layering pine paving gross thickness controls at 60cm ~ 100cm; Drift-sand embankment both sides ultra-wide is not less than 50cm, edge Highway Embankment Compaction;
Specifically realized by following steps:
Step one: adopt watering or enclose grid immersion mode and to drench roadbed filling, soaks with bottom filling and is as the criterion; After filler has been sprinkled water, end face can carry out leveling without obvious ponding and roll; Roller compaction construction completes in latter 2 hours in watering;
Step 2: the mode that Highway Embankment Compaction adopts weak compacting of shaking and shake by force to combine:
First floor drift-sand Embankment Compaction Quality employing high frequency short arc is weak to shake, and vibroroller cmpacting pass is 2-3 time, and after first floor vibroroller cmpacting completes, embankment end face adopts static pressure method to roll one time;
Fill the second layer and more top drift-sand embankment, the second layer and more top drift-sand Embankment Compaction Quality adopt low frequency high amplitude to shake by force, and the second layer and the more top drift-sand low frequency high amplitude pass that shakes by force is 3-5 time;
The superiors' drift-sand debulking methods is with first floor drift-sand debulking methods.
2. thick-layer wind-blown sand fill subgrade compacting construction method according to claim 1, is characterized in that:
In step 2, before last layer filler paves, the embankment end face of the lower one deck of reply compacting spills permeable.
3. thick-layer wind-blown sand fill subgrade compacting construction method according to claim 1, is characterized in that:
In step 2, roll order for first low rear height, first in the middle of two rear flank; Rolling speed is no more than 6km/h, and employing runs at a low speed.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106012732A (en) * | 2016-06-12 | 2016-10-12 | 中国十七冶集团有限公司 | Construction method of drift-sand filler roadbed |
| CN107938453A (en) * | 2016-10-12 | 2018-04-20 | 新疆铁道勘察设计院有限公司 | Using construction technology of the Extra-fine sand as roadbed filling |
| CN108239987A (en) * | 2017-12-13 | 2018-07-03 | 中航勘察设计研究院有限公司 | Method for processing coral sand stratum foundation by adopting large-tonnage vibration rolling |
| CN113338097A (en) * | 2021-06-22 | 2021-09-03 | 甘肃路桥第四公路工程有限责任公司 | Construction method for compacting roadbed soft foundation |
| CN113718604A (en) * | 2021-07-15 | 2021-11-30 | 兰州交通大学 | Wind-accumulated sand filler filling method for desert abdominal highway |
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| JP3131806B2 (en) * | 1992-06-30 | 2001-02-05 | 大成ロテック株式会社 | Surface mixture in sports facilities |
| CN101503871A (en) * | 2009-03-19 | 2009-08-12 | 中铁十一局集团有限公司 | Dry-method construction method for drift-sand roadbed |
| CN104047214A (en) * | 2014-07-10 | 2014-09-17 | 中国二十二冶集团有限公司 | Roadbed construction method adopting aeolian sand filling |
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2016
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Patent Citations (3)
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| JP3131806B2 (en) * | 1992-06-30 | 2001-02-05 | 大成ロテック株式会社 | Surface mixture in sports facilities |
| CN101503871A (en) * | 2009-03-19 | 2009-08-12 | 中铁十一局集团有限公司 | Dry-method construction method for drift-sand roadbed |
| CN104047214A (en) * | 2014-07-10 | 2014-09-17 | 中国二十二冶集团有限公司 | Roadbed construction method adopting aeolian sand filling |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106012732A (en) * | 2016-06-12 | 2016-10-12 | 中国十七冶集团有限公司 | Construction method of drift-sand filler roadbed |
| CN107938453A (en) * | 2016-10-12 | 2018-04-20 | 新疆铁道勘察设计院有限公司 | Using construction technology of the Extra-fine sand as roadbed filling |
| CN108239987A (en) * | 2017-12-13 | 2018-07-03 | 中航勘察设计研究院有限公司 | Method for processing coral sand stratum foundation by adopting large-tonnage vibration rolling |
| CN108239987B (en) * | 2017-12-13 | 2021-09-21 | 中航勘察设计研究院有限公司 | Method for processing coral sand stratum foundation by adopting large-tonnage vibration rolling |
| CN113338097A (en) * | 2021-06-22 | 2021-09-03 | 甘肃路桥第四公路工程有限责任公司 | Construction method for compacting roadbed soft foundation |
| CN113718604A (en) * | 2021-07-15 | 2021-11-30 | 兰州交通大学 | Wind-accumulated sand filler filling method for desert abdominal highway |
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