CN102220757A - Immediate processing method for drainage solidifying of super soft soil shallow surface space - Google Patents
Immediate processing method for drainage solidifying of super soft soil shallow surface space Download PDFInfo
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Abstract
The invention discloses an immediate processing method for drainage solidifying of a super soft soil shallow surface. The method comprises the following steps: (1) arranging a plurality of layers of horizontal drainage channel nets on the area to be reinforced of a super soft foundation, wherein each horizontal drainage channel net comprises a plurality of longitudinal, lateral or criss-cross horizontal drainage channels and a plurality of horizontal converging tubes, and the longitudinal, lateral or criss-cross horizontal drainage channels at the same layer are converged at the corresponding horizontal converging tubes; (2) converging the horizontal converging tubes at different layers to a plurality of vertical corrugated pipe, and connecting the corrugated pipes with vacuumizing equipment to form a stereo net-shaped drainage system; and (3) laying a geotextile layer and 1-2 layers of sealing films on the surface of a reinforced area, utilizing the vacuumizing equipment to vacuumize, spraying water on the surfaces of the sealing films, and unloading about 30-60 days later. The immediate processing method provided by the invention can be used as a shallow surface pretreatment measure, and also can be used for carrying out one-time process on a foundation with lower requirement on processing depth until the processed foundation can meet the operating requirement. By utilizing the technology provided by the invention to reinforce the foundation, the construction period can be greatly shortened, and the construction cost is lowered.
Description
Technical field
The present invention relates to fields such as port works, highway engineering, construction work, specifically is the engineering of mud or the weak ground stabilization of ultra-softs such as hydraulic reclamation mud scum, mud recently.
Background technology
Sustained and rapid development along with China's economy, the infrastructure scale of China's Coastal Areas is unprecedented in recent years, in order to solve engineering problems of land utilization such as port and pier, building, highway, a large amount of reclaiming land around sea engineerings has been carried out in areas such as Tianjin, Wenzhou, Lianyun Harbour, Xiamen, Nansha, Guangzhou and Shenzhen Yantian in recent years.In order to reduce cost, most of reclaiming land around sea engineering is all in conjunction with the engineering of desilting and dredging of navigation channel or marine outfall, super soft weak soils such as hydraulic reclamation mud scum, mud are as backfilling material, the ground top layer that forms is a super soft weak soil, water content is high, with industrial occupancy, Harbor, Tianjin is example, its average moisture content reaches more than 200%, intensity and bearing capacity are extremely low, various construction equipments can't be constructed thereon, usually need take preliminary treatment such as cool solarization, top layer reinforcement method, the application of vacuum of shallow top layer, and then carry out the secondary consolidation and handle.
Traditional natural drying method duration often reaches 1～2 year, construction period is long, often do not satisfy present infrastructure rate requirement, and airing only limits to the top layer, still need lay several layers of chaste tree fragrant plant, geo-grid or geotextiles etc. after the airing and just can guarantee carrying out smoothly of after-treatment.
Promptly on super soft weak soil, lay woven cloth, chaste tree fragrant plant and several layers of geo-grid etc. as for the top layer reinforcement method, backfill sand then, practice shows that this method is absorbed in a large amount of sand sides and does not still form crust layer in the mud, but cause the serious silt phenomenon of squeezing, even mud influxs ground surface in a large number, consolidation effect is poor, construction period is long, cost is high and uncontrollable, construction is dangerous high, and forms inhomogeneous ground, and relative settlement is big behind the worker.
Shallow top layer vacuum method generally commonly plugs vertical plastic draining board, vacuumizes then with after the top layer discharge pipe line is connected.This method is for clay, the higher super soft ground (as the weak soil in areas such as Tianjin, Lianyun Harbour) of content of colloid grain, owing to influenced by band drain filter membrane aperture and plate core thickness etc., pumpdown time in the near future, band drain core clogging will appear, or wrapped up by fine and close mud around the band drain, promptly in the super soft weak soil ground, forming the vertical mud post that gathers, drainability significantly reduces, mud post periphery is still stream mud after causing often reinforcing, and consolidation effect is undesirable.
Publication number is CN101021069, open day is on August 22nd, 2007, denomination of invention is that the Chinese invention patent potential energy of " stereo-low-level vacuum prepressing soft foundation processing method " has been opened the flexible foundation treatment method in a kind of hydraulic reclamation epeirogenetic engineering, it at first is to make one deck horizontal drainage passage in the future between original ground and barged-in fill, secondly in original ground, set up the vertical drainage passage, on original foundation surface, desire the barged-in fill height again and establish one deck horizontal drainage passage at least again, and make it and aforementioned vertical drainage passage UNICOM; Then at the horizontal drainage passage middle berth horizontal tube of original foundation surface, and extend to the outside, cofferdam and be connected, form three-dimensional low-pressure drainage system with vacuum pump.Next carry out dredge fill, hydraulic reclamation enters the vacuum drainage stage after finishing.This technology only limits to treat hydraulic reclamation epeirogenetic engineering, and for existing soft soil foundation, or it is then inapplicable to have formed the weak native ground of land-based area.
Summary of the invention
The present invention aims to provide a kind of technology that is applied to mud or the quick consolidation process grounds of ultra-soft soil superficial ground such as hydraulic reclamation mud scum, mud of saving cost, reduction of erection time fast, effectively, greatly.
In order to achieve the above object, the present invention has adopted following technology: a kind of ultra-soft soil superficial space discharging consolidation immediate processing method comprises the steps:
(1) ground treats that stabilization zone is along depth direction layout several layers horizontal drainage network of channels a little less than ultra-soft, described horizontal drainage network of channels comprises some horizontal drainage passages of vertically arranging or some horizontal drainage passages of laterally arranging or vertical, laterally staggered horizontal drainage passage
Described horizontal drainage network of channels also comprises some horizontal manifold trunks, is pooled to the horizontal manifold trunk of its correspondence with the vertical or horizontal horizontal drainage passage of one deck;
(2) the horizontal manifold trunk of different layers is collected to vertical bellows, and some vertical bellowss are connected with vaccum-pumping equipment, forms a solid netted drainage system;
(3) lay one deck geotextiles and 1～2 layer of sealing film on the stabilization zone surface, move described vaccum-pumping equipment and vacuumize, cover water, unloading after about 30～60 days at the sealing face.
Wherein, described horizontal drainage passage can be selected a kind of in plastics french drain, flexible porous tube, PVC chimney filter, french drain, the abrasive band or some kinds for use, and in horizontal drainage passage outsourcing layer of non-woven fabric as filter membrane.
Specifically, the adjacent interchannel parallel distance of horizontal drainage is 0.5～1.2m.
The horizontal drainage network of channels of adjacent layer is 0.5～1.2m along super soft weak soil depth direction spacing, and the horizontal drainage network of channels of the bottom is laid the degree of depth and reached the soft layer bottom surface or specify the above 0.5m of reinforcement depth.
The end of described horizontal drainage passage all is connected with horizontal manifold trunk, and the horizontal range between two adjacent horizontal manifold trunks is 30～50m.
Wherein, described geotextiles can be selected a kind of in woven cloth, nonwoven or the composite earthwork cloth or some kinds for use; Described diaphragm seal can be selected a kind of in polyethylene sheeting, polyvinyl chloride film, the plastic film for agricultural use or some kinds for use; Stabilization zone border seal film treads in that the degree of depth is not less than 1m in the mud.
Wherein, the power of described vaccum-pumping equipment is by the per 1000 square metres of layouts of 5～8kw, take the progressively method of turn on pump, spaced apart termination of pumping, vacuumize and drive neat all vacuum pumps after about 7～15 days, and the water of discharging directly overlays on the face, makes super soft weak soil accelerate discharging consolidation under vacuum preloading and water ballast(ing) precompressed effect.
The present invention be a little less than ultra-softs such as mud or hydraulic reclamation mud scum, mud ground along depth direction every the horizontally embedded one deck horizontal drainage of determining deviation network of channels, this horizontal drainage network of channels by vertical, horizontal or two-way in length and breadth staggered horizontal drainage passage as the arterial drainage passage; Then these horizontal drainage passages are connected with horizontal manifold trunk, horizontal manifold trunk is connected with vaccum-pumping equipment again, thereby forms the netted drainage system in space; And then lay one deck at the mud face and protect geotextiles and 1～2 layer of sealing film, and vaccum-pumping equipment is vacuumized, be generally January approximately～unload after May.
The present invention compared with prior art has following advantage:
1, utilization of the present invention is embedded in the horizontal drainage network of channels in the super soft weak soil layer, vertical drainage systems such as general vertical plastic draining board have been replaced, avoided because super soft weak soil clay, content of colloid grain are higher, thereby band drain filter membrane, the blocked phenomenon that causes the band drain drainage performance normally to bring into play of plate core, and the transmission and the drainage efficiency of raising negative pressure of vacuum.
2, by laying geotextiles and diaphragm seal on super soft weak soil surface, gas leak phenomenon during having avoided vacuumizing, and can make full use of water that pump drainage goes out or by retaining etc. as the prefabricating load consolidated subsoil, accelerate the weak soil discharging consolidation; In addition the geotextiles of laying and diaphragm seal play the safe construction protective action.
3, by method such as turn on pump, spaced apart termination of pumping progressively main line is vacuumized, avoids forming mud post phenomenon at the drainage channel periphery, make the super soft weak soil layer under the negative pressure of vacuum effect fast, effective discharging consolidation.
The technology of the present invention can be used as the preliminary treatment measure of shallow top layer, also can require more shallow ground to carry out the disposable instructions for use of handling to handling the degree of depth.Use present technique consolidation process ground reduction of erection time, reduction construction cost greatly.
Description of drawings
Fig. 1 is embodiment 1 a stabilization zone sectional schematic diagram.
Fig. 2 is embodiment 2 stabilization zone sectional schematic diagrams.
Fig. 3 is a soft soil foundation space stabilization by drainage treatment technology construction flow chart.
Specific implementation method
Embodiment 1
(1) level of processing drainage channel: utilize materials such as plastics french drain, flexible porous tube, PVC chimney filter, sand french drain, abrasive band as the drainage channel core, outsourcing one deck 90～200g/m
2Nonwoven make drainage channel.
(2) bury first floor horizontal drainage network of channels underground: as shown in Figure 1, foundation surface is that 0.5～1.2m lays transverse drainage passage 11 by parallel distance a little less than ultra-soft, a transverse horizontal manifold trunk is inserted at the two ends of transverse drainage passage 11, and every interval 30～50m inserts a transverse horizontal manifold trunk, constitutes one deck horizontal drainage network of channels.Horizontal manifold trunk is every certain spacing, concrete between square can decide according to the length and width of pumped vacuum systems power and stabilization zone, the control principle is that the per 1000 square metres of density of 5～8kw are provided with a film outlet port, film outlet port is connected with vertical bellows 3.
Bury second layer horizontal drainage network of channels underground: foundation surface is that 0.5～1.2m lays longitudinal drainage passage 12 by parallel distance a little less than ultra-soft, and is about 0.5～1.2m more than the first floor horizontal drainage network of channels with longitudinal drainage passage 12 and its horizontal manifold trunk compression distance.
Bury the 3rd layer, the 4th layer and last layer horizontal drainage network of channels more successively underground, until last one deck horizontal drainage network of channels about 0.5m below the foundation surface a little less than the ultra-soft.
(3) lay one deck geotextiles 4 and 1～2 layer of diaphragm seal 5 at the super soft weak soil foundation surface, stabilization zone border seal film 5 treads in that the degree of depth is not less than 1m in the mud.
(4) bellows 3 that will expose the mud face is connected with vaccum-pumping equipment, the power of vaccum-pumping equipment is by the per 1000 square metres of layouts of 5～8kw, to each pumped vacuum systems numbering, take progressively that method such as turn on pump, spaced apart termination of pumping vacuumizes, vacuumize and drive neat all vacuum pumps after about 7～15 days.
(5) water that will vacuumize discharge covers on the face, if can build the cofferdam at the stabilization zone periphery, can replenish the water source from the external world, improves the retaining degree of depth.
(6) vacuumize during the closely pore water pressure and the surface layer sedimentation situation at monitoring soft soil base different depth place, and according to the degree of consolidation of surveying pore pressure dissipation situation and settling data reckoning weak soil, be aided with means such as cone penetration test and vane shear test in case of necessity and detect the reinforcement of soft soil situation, as control unloading foundation.Pumpdown time visual field ground geological conditions and deciding is generally January～May.
Its overall flow as shown in Figure 3.
Embodiment 2
(1), utilize materials such as plastics french drain, flexible porous tube, PVC chimney filter, sand french drain, abrasive band as the drainage channel core, outsourcing one deck 90～200g/m according to embodiment 1 level of processing drainage channel
2Nonwoven.
(2) bury first floor horizontal drainage network of channels underground: as shown in Figure 2, foundation surface is that 0.5～1.2m lays transverse drainage passage 11 by parallel distance a little less than ultra-soft, is that 0.5～1.2m lays longitudinal drainage passage 12 by parallel distance simultaneously.The two ends of transverse drainage passage 11 connect into transverse horizontal manifold trunk 13, and every interval 30～50m is provided with a transverse horizontal manifold trunk; In like manner, longitudinal drainage passage 12 also inserts its vertical equity manifold trunk, and every interval 30～50m is provided with a vertical equity manifold trunk, comprises laterally and the horizontal drainage network of channels of vertical pipeline thereby constitute one deck, laterally reaches between vertical pipeline directly not to be communicated with.Horizontal manifold trunk is provided with a film outlet port every certain spacing, and film outlet port is connected with vertical bellows 3.
Whole layer horizontal drainage network of channels is pressed into weak soil layer bottom surface or requires the above about 0.5m in reinforcement depth place.One end of bellows 3 exposes the mud face.
Bury second layer horizontal drainage network of channels underground, press first floor horizontal drainage network of channels and lay second layer horizontal drainage network of channels, and to be pressed into the degree of depth be the above about 0.5～1.2m of first floor horizontal drainage network of channels.
Bury the 3rd layer, the 4th layer and last layer horizontal drainage network of channels more successively underground, until last one deck horizontal drainage network of channels about 0.5m below the foundation surface a little less than the ultra-soft.
(3) lay one deck geotextiles 4 and 1～2 layer of diaphragm seal 5 at the super soft weak soil foundation surface, stabilization zone border seal film 5 treads in that the degree of depth is not less than 1m in the mud.
(4) bellows 3 that will expose the mud face is connected with vaccum-pumping equipment 6, the power of vaccum-pumping equipment 6 is by the per 1000 square metres of layouts of 5～8kw, to each pumped vacuum systems numbering, take progressively that method such as turn on pump, spaced apart termination of pumping vacuumizes, vacuumize and drive neat all vacuum pumps after about 7～15 days.
(5) water that will vacuumize discharge covers on the face, if can build the cofferdam at the stabilization zone periphery, can replenish the water source from the external world, improves the retaining degree of depth.
(6) vacuumize during the closely pore water pressure and the surface layer sedimentation situation at monitoring soft soil base different depth place, and according to the degree of consolidation of surveying pore pressure dissipation situation and settling data reckoning weak soil, be aided with means such as cone penetration test and vane shear test in case of necessity and detect the reinforcement of soft soil situation, as control unloading foundation.Pumpdown time visual field ground geological conditions and deciding is generally January～May.
Its overall flow as shown in Figure 3.
Claims (7)
1. discharging consolidation immediate processing method in ultra-soft soil superficial space is characterized in that comprising the steps:
(1) ground is treated stabilization zone along depth direction layout several layers horizontal drainage network of channels a little less than ultra-soft, and described horizontal drainage network of channels comprises some horizontal drainage passages of vertically arranging or some horizontal drainage passages of laterally arranging or vertical, laterally staggered horizontal drainage passage;
Described horizontal drainage network of channels also comprises some horizontal manifold trunks, is pooled to the horizontal manifold trunk of its correspondence with the vertical or horizontal horizontal drainage passage of one deck;
(2) the horizontal manifold trunk of different layers is collected to some vertical bellowss, and vertical bellows is connected with vaccum-pumping equipment, forms a solid netted drainage system;
(3) lay one deck geotextiles and 1～2 layer of sealing film on the stabilization zone surface, described vaccum-pumping equipment is vacuumized, cover water, unloading after about 30～60 days at the sealing face.
2. ultra-soft soil superficial according to claim 1 space discharging consolidation immediate processing method, it is characterized in that: described horizontal drainage passage can be selected a kind of in plastics french drain, flexible porous tube, PVC chimney filter, french drain, the abrasive band or some kinds for use, and in horizontal drainage passage outsourcing layer of non-woven fabric as filter membrane.
3. ultra-soft soil superficial according to claim 1 space discharging consolidation immediate processing method is characterized in that: the interchannel parallel distance of adjacent horizontal drainage is 0.5～1.2m.
4. ultra-soft soil superficial according to claim 1 space discharging consolidation immediate processing method, it is characterized in that: the horizontal drainage network of channels of adjacent layer is 0.5～1.2m along super soft weak soil depth direction spacing, and the horizontal drainage network of channels of the bottom is laid the degree of depth and reached the soft layer bottom surface or specify the above 0.5m of reinforcement depth.
5. ultra-soft soil superficial according to claim 1 space discharging consolidation immediate processing method, it is characterized in that: the end of described horizontal drainage passage all is connected with horizontal manifold trunk, and the horizontal range between two adjacent horizontal manifold trunks is 30～50m.
6. ultra-soft soil superficial according to claim 1 space discharging consolidation immediate processing method is characterized in that: described geotextiles can be selected a kind of in woven cloth, nonwoven or the composite earthwork cloth or some kinds for use; Described diaphragm seal can be selected a kind of in polyethylene sheeting, polyvinyl chloride film, the plastic film for agricultural use or some kinds for use; Stabilization zone border seal film treads in that the degree of depth is not less than 1m in the mud.
7. ultra-soft soil superficial according to claim 1 space discharging consolidation immediate processing method, it is characterized in that: the power of described vaccum-pumping equipment is by the per 1000 square metres of layouts of 5～8kw, take the progressively method of turn on pump, spaced apart termination of pumping, vacuumize and drive neat all vacuum pumps after about 7～15 days, and the water of discharging directly overlays on the face, makes super soft weak soil accelerate discharging consolidation under vacuum preloading and water ballast(ing) precompressed effect.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103485326A (en) * | 2013-09-29 | 2014-01-01 | 中铁港航局集团有限公司 | Staggered pump-starting construction method for soft foundation reinforcement treatment |
| CN105908695A (en) * | 2016-05-31 | 2016-08-31 | 浙江工业大学 | Dredger fill drainage consolidation system and construction method thereof |
| CN106049411A (en) * | 2016-05-31 | 2016-10-26 | 浙江工业大学 | Dredger fill drainage consolidation system and construction method thereof |
| CN106840086A (en) * | 2017-02-22 | 2017-06-13 | 天津城建大学 | The rapidly solidified weak soil experimental rig of low Low Level vacuum method |
| CN106869107A (en) * | 2017-02-28 | 2017-06-20 | 河北工业大学 | The novel solid drainage system and its dewatering construction method of a kind of reinforcing soft ground |
| CN107165156A (en) * | 2017-07-07 | 2017-09-15 | 交通运输部天津水运工程科学研究所 | A kind of transverse direction sets the construction equipment and construction method of plastic draining board |
| CN107916662A (en) * | 2017-11-28 | 2018-04-17 | 武汉大学 | Soft foundation discharge fixing method |
| CN113494066A (en) * | 2021-07-22 | 2021-10-12 | 中国电建集团中南勘测设计研究院有限公司 | Concrete faced rockfill dam and construction method thereof |
| CN115434301A (en) * | 2022-08-03 | 2022-12-06 | 上海渊丰地下工程技术有限公司 | Vacuum preloading drainage system and foundation treatment method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106049411A (en) * | 2016-05-31 | 2016-10-26 | 浙江工业大学 | Dredger fill drainage consolidation system and construction method thereof |
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| CN106840086A (en) * | 2017-02-22 | 2017-06-13 | 天津城建大学 | The rapidly solidified weak soil experimental rig of low Low Level vacuum method |
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| CN107165156A (en) * | 2017-07-07 | 2017-09-15 | 交通运输部天津水运工程科学研究所 | A kind of transverse direction sets the construction equipment and construction method of plastic draining board |
| CN107165156B (en) * | 2017-07-07 | 2022-11-15 | 交通运输部天津水运工程科学研究所 | Construction equipment and construction method for transversely arranging plastic drainage plate |
| CN107916662A (en) * | 2017-11-28 | 2018-04-17 | 武汉大学 | Soft foundation discharge fixing method |
| CN113494066A (en) * | 2021-07-22 | 2021-10-12 | 中国电建集团中南勘测设计研究院有限公司 | Concrete faced rockfill dam and construction method thereof |
| CN115434301A (en) * | 2022-08-03 | 2022-12-06 | 上海渊丰地下工程技术有限公司 | Vacuum preloading drainage system and foundation treatment method |
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Address after: 510220 No. 157 Qianjin Road, Guangdong, Guangzhou Patentee after: Zhongjiao Sihang Engineering Inst. Co., Ltd. Patentee after: CCCC Fourth Harbor Engineering Co., Ltd. Patentee after: China Harbour Engineering Co., Ltd. Patentee after: CCCC Fourth Harbor Geotechnical Engineering Co., Ltd. Patentee after: Guangzhou Harbor Engineering Quality Examination Co., Ltd. Address before: 510220 No. 157 Qianjin Road, Guangdong, Guangzhou Patentee before: Zhongjiao Sihang Engineering Inst. Co., Ltd. Patentee before: CCCC Fourth Harbor Engineering Co., Ltd. Patentee before: China Harbour Engineering Co., Ltd. Patentee before: Guangzhou Sihang Geotechnical Engineering Co., Ltd. Patentee before: Guangzhou Harbor Engineering Quality Examination Co., Ltd. |
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Effective date of registration: 20210928 Address after: No. 157, Guangzhou City, Guangdong, Guangdong Patentee after: CCCC FOURTH HARBOR ENGINEERING INSTITUTE Co.,Ltd. Patentee after: CCCC Fourth Harbor Engineering Co.,Ltd. Patentee after: CHINA HARBOUR ENGINEERING 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, Qianjin Road, Guangzhou, Guangdong 510220 Patentee before: CCCC FOURTH HARBOR ENGINEERING INSTITUTE Co.,Ltd. Patentee before: CCCC Fourth Harbor Engineering Co.,Ltd. Patentee before: CHINA HARBOUR ENGINEERING Co.,Ltd. Patentee before: CCCC FOURTH HARBOR GEOTECHNICAL ENGINEERING Co.,Ltd. Patentee before: GUANGZHOU HARBOR ENGINEERING QUALITY EXAMINATION Co.,Ltd. |
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