CN103850244A - Method of stabilizing soft foundation through deep processing of bagged sand bed in freezing environment - Google Patents
Method of stabilizing soft foundation through deep processing of bagged sand bed in freezing environment Download PDFInfo
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- CN103850244A CN103850244A CN201410076861.8A CN201410076861A CN103850244A CN 103850244 A CN103850244 A CN 103850244A CN 201410076861 A CN201410076861 A CN 201410076861A CN 103850244 A CN103850244 A CN 103850244A
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Abstract
The invention discloses a method of stabilizing a soft foundation through deep processing of a bagged sand bed in a freezing environment. The method comprises the following steps of freezing the soft foundation under natural freezing conditions so as to form a hard frozen hard shell layer on the surface of the soft foundation; laying filling sand on the whole soft foundation region; carrying out hydraulic reclamation on silt fine sand or medium-coarse sand in reclamation as a sand bed; arranging a vertical drainage system; arranging a horizontal drainage system; laying a sealing film; after conforming to the vacuum condition, carrying out deep vacuum preloading or preloading or vacuum united preloading. According to the method, the freezing environment is utilized scientifically, a construction process is optimized reasonably, the deep drainage consolidation treatment is only carried out on the soft foundation once, the construction cost is reduced by about 1/4, and meanwhile, the winter time, which is not suitable for construction routinely, is utilized, the method is scientific and environment-friendly, and the good economic benefit and social benefit can be produced.
Description
Technical field
The present invention relates to the method to the processing 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.The weak soils such as marine facies mud lower to lakes and marhshes, valley floor, barged-in fill, beach or bearing capacity, through processing, are become to the ground with certain bearing capacity, will greatly improve the situation of land resources growing tension.
For weak soil have that water content is high, compressibilty is large, shear strength is low, bad hydraulic permeability, characteristic that intensity is low, the main reinforcement means adopting 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, to lay woven cloth, chaste tree fragrant plant, several layers of geo-grid and nonwoven 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 and in mud, does not still become crust layer, but cause the serious silt phenomenon of squeezing, construction period is long, cost is high and uncontrollable, and construction is dangerous high, and forms inhomogeneous ground.
" precompressed of shallow layer soft soil reinforcing+deep vacuum " the after-treatment scheme generally adopting in recent years, first by shallow layer soft soil consolidation process, significantly reduce shallow-layer soil moisture content, and make its top layer formation one deck there is the crust layer of certain bearing capacity, meet the needed bearing capacity condition of follow-up hydraulic fill sand bed course and mechanical plate, and then carry out secondary deep vacuum precompressed processing.The method has following shortcoming: (1) whole construction technology time is relatively long; (2) shallow top layer processing cost is as temporary construction measure, and cost is higher; (3) limit by technical condition own, it is limited that consolidation effect is processed on shallow top layer; (4) this technology a large amount of artificial enforcement of main dependence at present, workmanship is difficult to control, and process on simultaneously shallow top layer need be in the operation of mud face, and construction environment is poor and dangerous high.
In conventional soft base processing method the vacuum preloading construction cycle longer, carry out for convenience deep layer treatment of soft foundation, conventionally need carry out the reinforcing soft foundation processing of shallow top layer, 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, has caused 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 freezing 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:
Packed sand cushion deep level of processing soft soil foundation reinforcing method under a kind of freezing 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 by by bag and filling, the filler in bag forms, described bag has upper surface and soffit, and upper surface is reserved with some cuffs, is provided with evenly and at intervals some bar strips between upper surface and soffit;
(3) described sand by hydraulic reclamation powder 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 foundation top layer form overall composite cushion;
(4) described overall composite cushion is carried out to loading test, meet after mechanical plate requirement, lay vertical drainage system;
(5) located level drainage system;
(6) lay diaphragm seal;
(7) lay vacuum preloading equipment and distribution line, in the time that finish ice period, carry out deep vacuum precompressed or piling prepressing or combined vacuum and surcharge preloading after meeting the condition of vacuumizing.
Preferably, one or more the mixing good by bag material selection water permeability and that meet in the woven cloth, woven fabric, canvas, gauze of requirement of strength, tension and shear behavior of described step 2 medium sand is used.
Preferably, the filler in step 2 choose in medium coarse sand, powder fine sand, silt, silty clay, flyash, cinder, lime or oxidant one or more mixing use.
Preferably, the lacing wire in step 2 selects nylon lacing wire or steel to mould composite wire-lacing, and sand is filled with THICKNESS CONTROL at 20～30cm.
Specifically, in step 4, vertical drainage system comprises band drain or sand wick, described band drain type comprise 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 one or more mixing use.
Further, step 6 also comprises piling prepressing construction, and optional one or more the mixing with in sand material, earth and stone material, cinder, gangue or water ballast(ing) of the heap carrier material of piling prepressing construction before piling prepressing construction, need be laid geotextiles on diaphragm seal.
Preferably, step 6, in the time selecting water ballast(ing), should be built 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 or the piling prepressing under freezing environment, the method has not only been broken the inertial thinking that can not carry out treatment of soft foundation winter, 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 adopting in recent years, the construction processing of having saved a shallow layer soft soil reinforcing, has significantly reduced construction cost.
On the whole, the freezing environment of scientific utilization of the present invention, reasonably optimizing working procedure, only need carry out the processing of a deep layer discharging consolidation to soft base, construction cost reduces approximately 1/4, has utilized the conventional winter time that should not construct 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.
The specific embodiment
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 is fixed.
Take China's national new district barged-in fill ground stabilization as example, the specific embodiment of the present invention is described as follows below.This area is located in 39 ° of left and right of latitude, and be March December～next year ice period.When Specific construction operation, also need to consult meteorological data for many years, scientifically arrange activity time node.
(1) entering after ice period, weak soil 1 is freezing under naturally frozen condition, thereby forms hard freezing crust layer on surface.
(2) back-up sand, by 2, is arranged in whole hydraulic reclamation region.Sand is made up of 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 material good by water permeabilities such as woven cloth, woven fabric, canvas, gauzes and that have the intensity that meets construction requirement is made, and has the tension and the shear behavior that meet construction requirement.Filler 13 has good permeance property, can select in medium coarse sand, powder fine sand, silt, silty clay, flyash, cinder, lime or oxidant one or more mixing use.Filling method can adopt the modes such as hydraulic fill, gas pump or mechanical pressure, and the filling cuff 14 of being reserved by bag upper surface is filled with sand by bag by filler, and cuff spacing arranges according to condition of construction; Between bag upper and lower surface, be provided with evenly and at intervals many bar strips 15, in order to control sand by thickness, prevent the inhomogeneous protuberance of sand quilt, improve sand by intensity.Lacing wire spacing, length are arranged by thickness according to required sand.Lacing wire can select nylon lacing wire, steel to mould the tensile materials such as composite wire-lacing.Sand is filled with thickness should be controlled 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 powder 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 finishes, can with sand by and frozen soft base table layer form overall composite cushion, for improving total bearing capacity.
(4) the packed sand cushion of overall composite, water-drain is carried out to loading test, meet after mechanical plate requirement, lay vertical drainage system 4, as plug 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 lay 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 nonwoven 7.
(6) lay diaphragm seal 8, also can on diaphragm seal, carry out further piling prepressing construction.Heap carrier material 11 can be selected the materials such as sand material, earth and stone material, cinder, gangue or water ballast(ing) according to field condition.In the time 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, need on diaphragm seal, lay geotextiles 9, play the effect of protection diaphragm seal.
(7) lay vacuum preloading equipment 10 and distribution line, according to whole construction arrangement and construction progress, in the time that finish ice period, meet after the condition of vacuumizing, carry out prepressing water discharge consolidation process, for example 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 modification of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in claim protection domain of the present invention.
Claims (7)
1. a packed sand cushion deep level of processing soft soil foundation reinforcing method under freezing 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 by by bag and filling, the filler in bag forms, described bag has upper surface and soffit, and upper surface is reserved with some cuffs, is provided with evenly and at intervals some bar strips between upper surface and soffit;
(3) described sand by hydraulic reclamation powder 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 foundation top layer form overall composite cushion;
(4) described overall composite cushion is carried out to loading test, meet after mechanical plate requirement, lay vertical drainage system;
(5) located level drainage system;
(6) lay diaphragm seal;
(7) lay vacuum preloading equipment and distribution line, in the time that finish ice period, carry out deep vacuum precompressed or piling prepressing or combined vacuum and surcharge preloading after meeting the condition of vacuumizing.
2. method according to claim 1, is characterized in that: one or more the mixing good by bag material selection water permeability and that meet in the woven cloth, woven fabric, canvas, gauze of requirement of strength, tension and shear behavior of described step 2 medium sand is used.
3. method according to claim 2, is characterized in that: filler choose in medium coarse sand, powder fine sand, silt, silty clay, flyash, cinder, lime or oxidant one or more mixing use.
4. method according to claim 2, is characterized in that: lacing wire selects nylon lacing wire or steel to mould composite wire-lacing, 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 comprise 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 one or more mixing use.
6. method according to claim 1, it is characterized in that: step 6 also comprises piling prepressing construction, optional one or more the mixing with in sand material, earth and stone material, cinder, gangue or water ballast(ing) of the heap carrier material of piling prepressing construction, before piling prepressing construction, need on diaphragm seal, lay geotextiles.
7. method according to claim 6, is characterized in that: step 6, in the time selecting water ballast(ing), should be built 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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| CN201410076861.8A CN103850244B (en) | 2014-03-04 | 2014-03-04 | Bagged sand bed course deep level of processing soft soil foundation reinforcing method under a kind of refrigerated environment |
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| CN201410076861.8A CN103850244B (en) | 2014-03-04 | 2014-03-04 | Bagged sand bed course deep level of processing soft soil foundation reinforcing method under a kind of refrigerated environment |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104358250A (en) * | 2014-11-11 | 2015-02-18 | 盐城工学院 | Hard casing for dredged sediment consolidation and water drainage and consolidation method using hard casing |
| 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 |
| CN110423052A (en) * | 2019-07-30 | 2019-11-08 | 青海盐湖工业股份有限公司 | A kind of hardening structure and hardening construction method on salinized 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 |
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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 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104358250A (en) * | 2014-11-11 | 2015-02-18 | 盐城工学院 | Hard casing for dredged sediment consolidation and water drainage and consolidation method using hard casing |
| 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 |
| CN110423052A (en) * | 2019-07-30 | 2019-11-08 | 青海盐湖工业股份有限公司 | A kind of hardening structure and hardening construction method on salinized soil ground |
| 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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| CN103850244B (en) | 2016-01-13 |
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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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