CN103850244B - Bagged sand bed course deep level of processing soft soil foundation reinforcing method under a kind of refrigerated environment - Google Patents
Bagged sand bed course deep level of processing soft soil foundation reinforcing method under a kind of refrigerated environment Download PDFInfo
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- CN103850244B CN103850244B CN201410076861.8A CN201410076861A CN103850244B CN 103850244 B CN103850244 B CN 103850244B CN 201410076861 A CN201410076861 A CN 201410076861A CN 103850244 B CN103850244 B CN 103850244B
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Abstract
The invention discloses bagged sand bed course deep level of processing soft soil foundation reinforcing method under a kind of refrigerated environment, it comprises the following steps: soft foundation is freezing under naturally frozen condition, and soft foundation surface forms hard freezing crust layer; Back-up sand quilt is also arranged in whole soft foundation region; Hydraulic reclamation Extra-fine sand or fill medium coarse sand as sand cushion; Lay vertical drainage system; Located level drainage system; Lay diaphragm seal; Deep vacuum precompressed or piling prepressing or combined vacuum and surcharge preloading is carried out after meeting vacuumized conditions.Scientific utilization refrigerated environment of the present invention, reasonably optimizing working procedure, only need carry out the process of a deep layer discharging consolidation to soft base, construction cost reduces about 1/4, make use of the winter time that routine should not be constructed, science environmental protection simultaneously, produce good economic benefit and social benefit.
Description
Technical field
The present invention relates to the method to the process of soft base discharging consolidation in the engineering constructions such as a kind of highway, municipal administration.
Technical background
Along with the sustainable development of national economy, construction scale of projects constantly expands, and land resources is more and more nervous.By weak soils such as ocean sludge lower to lakes and marhshes, valley floor, barged-in fill, beach or bearing capacity through process, become the ground with certain bearing capacity, will greatly improve the situation of land resources growing tension.
Have for weak soil the characteristic that water content is high, compressibilty is large, shear strength is low, bad hydraulic permeability, intensity are low, the main reinforcement means adopted has natural drying and preloading at present.Natural drying top layer super soft weak soil needs to carry out pretreatment in 1 ~ 2 year, and efficiency of construction is low, and the construction period is long.A conventional vacuum method is on weak soil, lay woven cloth, chaste tree fragrant plant, several layers of geo-grid and non-woven fabrics etc., then hydraulic reclamation or artificial Cast-in-situ Piles in Sand-filling, practice shows that this method efficiency of construction is extremely low, a large amount of sand sides is absorbed in mud and does not still become crust layer, but serious crowded silt phenomenon is caused, construction period is long, cost is high and uncontrollable, and construction risk is high, and forms unevened foundaton.
" precompressed of shallow layer soft soil reinforcing+deep vacuum " the after-treatment scheme generally adopted in recent years, namely first by shallow layer soft soil consolidation process, significantly reduce shallow-layer soil moisture content, and its top layer is formed crust layer that one deck has certain bearing capacity, meet follow-up hydraulic fill sand bed course and the bearing capacity condition required for mechanical plate, and then carry out secondary deep vacuum precompressed process.The method has following shortcoming: (1) whole construction technology time is relatively long; (2) shallow treatment cost is as temporary construction measure, and cost is higher; (3) limitting by technical condition own, shallow treatment consolidation effect is limited; (4) this technology mainly relies on a large amount of artificial enforcement at present, and workmanship is difficult to control, and shallow treatment need in the operation of mud face simultaneously, and construction environment is poor and dangerous high.
In conventional soft base processing method, the vacuum preloading construction cycle is longer, and carry out deep gas reservoir for convenience, usually need carry out shallow top layer highway on soft ground, financial cost expends larger.
And in the northern area of China, because winter temperature is low, very cold, winter construction is often avoided in treatment of soft foundation, causes the significant wastage of time cost.
Summary of the invention
The object of the present invention is to provide a kind of for and scientifically utilize the refrigerated environment of northern China cold climate to carry out the drain reinforcing method for the treatment of of soft foundation.
The present invention adopts following technical scheme:
Bagged sand bed course deep level of processing soft soil foundation reinforcing method under a kind of refrigerated environment, is characterized in that comprising the following steps:
(1) soft foundation is freezing under naturally frozen condition, and soft foundation surface forms hard freezing crust layer;
(2) back-up sand by and arrange in whole soft foundation region, described sand is formed by by bag and the filler be filled in bag, described bag has upper surface and soffit, and upper surface is reserved with some cuffs, is provided with some bar strips evenly and at intervals between upper surface and soffit;
(3) described sand by hydraulic reclamation Extra-fine sand or fill medium coarse sand as sand cushion, after every day blast, sand cushion surface natural freezing, with described sand by and frozen soft ground surface layer form overall composite cushion;
(4) loading test is carried out to described overall composite cushion, after meeting mechanical plate requirement, lay vertical drainage system;
(5) located level drainage system;
(6) diaphragm seal is laid;
(7) lay vacuum preloading equipment and distribution line, at the end of ice period, after meeting vacuumized conditions, carry out deep vacuum precompressed or piling prepressing or combined vacuum and surcharge preloading.
Preferably, described step 2 medium sand and one or more used in combination that meet in the woven cloth of requirement of strength, tension and shear behavior, woven fabric, canvas, gauze good by bag material selection water permeability.
Preferably, one or more used in combination in medium coarse sand, Extra-fine sand, silt, silty clay, flyash, cinder, lime or oxidant chosen by the filler in step 2.
Preferably, nylon lacing wire or steel plastic compount lacing wire are selected in the lacing wire in step 2, and sand is filled with THICKNESS CONTROL at 20 ~ 30cm.
Specifically, in step 4, vertical drainage system comprises band drain or sand wick, and described band drain type comprises one or more used in combination in plastic draining board, coiled material band drain, silting blocking band drain, percolation-proof band drain, composite water draining board or three-dimensional band drain.
Further, step 6 also comprises piling prepressing construction, and one or more the mixing in the optional sand material of heap carrier material, earth and stone material, cinder, gangue or water ballast(ing) that piling prepressing is constructed, before piling prepressing construction, need lay geotextiles on diaphragm seal.
Preferably, step 6, when selecting water ballast(ing), should build cofferdam according to load, and cofferdam can select barged-in fill airing to form cofferdam or sand cofferdam or earth rock cofferdam or concrete cofferdam.
The present invention is deep vacuum precompressed under refrigerated environment or piling prepressing, the method has not only broken the inertial thinking that winter can not carry out treatment of soft foundation, also make full use of local climate characteristic (especially temperature), make soft foundation freezing under naturally frozen condition, soft foundation surface forms hard freezing crust layer, compare " precompressed of shallow layer soft soil reinforcing+deep vacuum " the after-treatment scheme generally adopted in recent years, save the construction processing of a shallow layer soft soil reinforcing, significantly reduce construction cost.
On the whole, scientific utilization refrigerated environment of the present invention, reasonably optimizing working procedure, only need carry out the process of a deep layer discharging consolidation to soft base, construction cost reduces about 1/4, make use of the winter time that routine should not be constructed simultaneously, science environmental protection, produces good economic benefit and social benefit.
Accompanying drawing explanation
Fig. 1 is construction flow chart of the present invention;
Fig. 2 is construction technology sectional schematic diagram of the present invention;
Fig. 3 is that back-up sand of the present invention is by schematic perspective view.
In figure, 1, weak soil, 2, sand quilt, 3, sand cushion, 4, vertical drainage body, 5, horizontal drainage pipeline, 6, horizontal draining board, 7, geotextiles, 8, diaphragm seal, 9, geotextiles, 10, jet pump, 11, piling prepressing material, 12, bag, 13, filler, 14, filling cuff, 15, bar strip.
Detailed description of the invention
As shown in Figure 1, for construction technology process of the present invention, comprise the following steps successively: form top layer freezing crust layer, back-up sand quilt, hydraulic fill sand bed course, lay vertical drainage system, located level drainage system, lay diaphragm seal or piling prepressing is constructed, prepressing water discharge consolidation.
Reinforce for China's national new district reclaimed ground below, the specific embodiment of the present invention is described as follows.This area is located in about 39 °, latitude, and ice period is December ~ March next year.Also need to consult meteorological data for many years during Specific construction operation, scientifically arrange activity time node.
(1) after entering ice period, weak soil 1 is freezing under naturally frozen condition, thus forms hard freezing crust layer on surface.
(2) back-up sand is by 2, arranges in whole hydraulic reclamation region.Sand is formed by by bag 12 and filler 13, wherein bag is of a size of 30 meters × 30 meters, bag 12 has upper surface and soffit, upper surface is provided with some filling cuffs 14, bag material by water permeabilities such as woven cloth, woven fabric, canvas, gauzes the good and material with the intensity meeting construction requirement make, there is the tension and shear behavior that meet construction requirement.Filler 13 has good permeance property, can select one or more used in combination in medium coarse sand, Extra-fine sand, silt, silty clay, flyash, cinder, lime or oxidant.Filling method can adopt the modes such as hydraulic fill, gas pump or mechanical pressure, and filler is filled with sand by bag by the filling cuff 14 reserved by bag upper surface, and cuff spacing is arranged according to condition of construction; Be provided with many bar strips 15 evenly and at intervals between bag upper and lower surface, in order to control sand by thickness, prevent the uneven protuberance of sand quilt, improve sand by intensity.Lacing wire spacing, length are arranged by thickness according to required sand.Lacing wire can select the tensile materials such as nylon lacing wire, steel plastic compount lacing wire.Sand is filled with thickness and should controls at 20cm ~ 30cm, and concrete filling thickness is depending on load on it.
(3) according to the demand of place bearing capacity, can sand by hydraulic reclamation Extra-fine sand or fill medium coarse sand as sand cushion 3, due to winter construction, after every day blast, layer of sand surface meeting natural freezing, after whole blast operation terminates, overall composite cushion can be formed, for improving total bearing capacity with sand quilt and frozen soft base table layer.
(4) loading test is carried out to overall composite, water-drain bagged sand bed course, after meeting mechanical plate requirement, lay vertical drainage system 4, as plugged band drain (band drain type comprises plastic draining board, coiled material band drain, silting blocking band drain, percolation-proof band drain, composite water draining board, three-dimensional band drain etc.) or laying sand wick.
(5) located level drainage system, comprises horizontal drainage pipeline 5 and horizontal draining board 6, and wherein horizontal drainage pipeline 5 is UPVC stereoplasm tube or plastic blind-ditch etc., carries out colligation chimney filter simultaneously, lays the construction technologies such as non-woven fabrics 7.
(6) lay diaphragm seal 8, also can carry out piling prepressing construction further on diaphragm seal.Heap carrier material 11 can select the materials such as sand material, earth and stone material, cinder, gangue or water ballast(ing) according to field condition.When selecting water ballast(ing), should build cofferdam according to load, cofferdam can select barged-in fill airing to form cofferdam, sand cofferdam, earth rock cofferdam, concrete cofferdam or other types.Before piling prepressing construction, geotextiles 9 need be laid on diaphragm seal, play the effect of protection diaphragm seal.
(7) lay vacuum preloading equipment 10 and distribution line, arrange and construction progress, at the end of ice period according to whole construction, after meeting vacuumized conditions, carry out prepressing water discharge consolidation process, such as deep vacuum precompressed, or piling prepressing or combined vacuum and surcharge preloading.
Above embodiment does not form limiting the scope of the present invention.Any amendment done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within claims of the present invention.
Claims (7)
1. a bagged sand bed course deep level of processing soft soil foundation reinforcing method under refrigerated environment, is characterized in that comprising the following steps:
(1) soft foundation is freezing under naturally frozen condition, and soft foundation surface forms hard freezing crust layer;
(2) back-up sand is laid on whole soft foundation region side by side, described sand is formed by by bag and the filler be filled in bag, described bag has upper surface and soffit, and upper surface is reserved with some cuffs, is provided with some bar strips evenly and at intervals between upper surface and soffit;
(3) described sand by hydraulic reclamation Extra-fine sand or fill medium coarse sand as sand cushion, after every day blast, sand cushion surface natural freezing, with described sand by and frozen soft ground surface layer form overall composite cushion;
(4) loading test is carried out to described overall composite cushion, after meeting mechanical plate requirement, lay vertical drainage system;
(5) located level drainage system;
(6) diaphragm seal is laid;
(7) lay vacuum preloading equipment and distribution line, at the end of ice period, after meeting vacuumized conditions, carry out deep vacuum precompressed or piling prepressing or combined vacuum and surcharge preloading.
2. method according to claim 1, is characterized in that: described step 2 medium sand and one or more used in combination that meet in the woven cloth of requirement of strength, woven fabric, canvas, gauze good by bag material selection water permeability.
3. method according to claim 2, is characterized in that: one or more used in combination in medium coarse sand, Extra-fine sand, silt, silty clay, flyash, cinder, lime or oxidant chosen by filler.
4. method according to claim 2, is characterized in that: nylon lacing wire or steel plastic compount lacing wire are selected in lacing wire, and sand is filled with THICKNESS CONTROL at 20 ~ 30cm.
5. method according to claim 1, it is characterized in that: in step 4, vertical drainage system comprises band drain or sand wick, described band drain type comprises one or more used in combination in plastic draining board, coiled material band drain, silting blocking band drain, percolation-proof band drain, composite water draining board or three-dimensional band drain.
6. method according to claim 1, it is characterized in that: step 6 also comprises piling prepressing construction, one or more mixing in the optional sand material of heap carrier material, earth and stone material, cinder, gangue or water ballast(ing) that piling prepressing is constructed, before piling prepressing construction, geotextiles need be laid on diaphragm seal.
7. method according to claim 6, is characterized in that: step 6, when selecting water ballast(ing), should build cofferdam according to load, and cofferdam can select barged-in fill airing to form cofferdam or sand cofferdam or earth rock cofferdam or concrete cofferdam.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104358250B (en) * | 2014-11-11 | 2016-03-30 | 盐城工学院 | For dredged mud consolidation hard shell body and apply the discharging consolidation method of this hard shell body |
| CN105421332A (en) * | 2015-12-01 | 2016-03-23 | 宁波滨海新城建设投资有限公司 | Soft foundation superficial layer novel treating method for accelerating natural consolidation of soft soil |
| CN106884423A (en) * | 2015-12-16 | 2017-06-23 | 中国二十冶集团有限公司 | Mud area method for processing foundation |
| CN110423052B (en) * | 2019-07-30 | 2021-11-16 | 青海盐湖工业股份有限公司 | Hardened structure and hardened construction method of saline soil ground |
| CN112854188A (en) * | 2021-01-09 | 2021-05-28 | 中铁广州工程局集团有限公司 | Soft soil foundation combined surcharge preloading construction method |
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| JP4112100B2 (en) * | 1998-11-19 | 2008-07-02 | 丸山工業株式会社 | Improvement method of soft ground in cold region. |
| CN101881024A (en) * | 2010-06-28 | 2010-11-10 | 连云港港口工程设计研究院有限公司 | Freeze thawing consolidation method for silt soft foundation |
| CN102912785A (en) * | 2012-11-08 | 2013-02-06 | 沈阳建筑大学 | Similarly arch stacked bagged gravel and sandy soil foundation reinforcement treatment method |
| CN103276720A (en) * | 2013-05-31 | 2013-09-04 | 中国矿业大学 | Soft soil subgrade freezing reinforcement method |
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2014
- 2014-03-04 CN CN201410076861.8A patent/CN103850244B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4112100B2 (en) * | 1998-11-19 | 2008-07-02 | 丸山工業株式会社 | Improvement method of soft ground in cold region. |
| CN101881024A (en) * | 2010-06-28 | 2010-11-10 | 连云港港口工程设计研究院有限公司 | Freeze thawing consolidation method for silt soft foundation |
| CN102912785A (en) * | 2012-11-08 | 2013-02-06 | 沈阳建筑大学 | Similarly arch stacked bagged gravel and sandy soil foundation reinforcement treatment method |
| CN103276720A (en) * | 2013-05-31 | 2013-09-04 | 中国矿业大学 | Soft soil subgrade freezing reinforcement method |
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Effective date of registration: 20211009 Address after: No. 157, Guangzhou City, Guangdong, Guangdong Patentee after: CCCC FOURTH HARBOR ENGINEERING INSTITUTE Co.,Ltd. Patentee after: GUANGZHOU HARBOR ENGINEERING QUALITY EXAMINATION Co.,Ltd. Patentee after: NATIONAL ENGINEERING RESEARCH CENTER OF DREDGING TECHNOLOGY AND EQUIPMENT Address before: No. 157, Guangzhou City, Guangdong, Guangdong Patentee before: CCCC FOURTH HARBOR ENGINEERING INSTITUTE Co.,Ltd. Patentee before: GUANGZHOU HARBOR ENGINEERING QUALITY EXAMINATION Co.,Ltd. Patentee before: GUANGZHOU SIHANG MATERIAL TECHNOLOGY Co.,Ltd. Patentee before: CCCC FOURTH HARBOR GEOTECHNICAL ENGINEERING Co.,Ltd. |
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