CN104594333A - Treatment method for soft clay foundations of annular electroosmosis single well drainage - Google Patents

Treatment method for soft clay foundations of annular electroosmosis single well drainage Download PDF

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Publication number
CN104594333A
CN104594333A CN201410734376.5A CN201410734376A CN104594333A CN 104594333 A CN104594333 A CN 104594333A CN 201410734376 A CN201410734376 A CN 201410734376A CN 104594333 A CN104594333 A CN 104594333A
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China
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individual well
electrode
soft clay
electroosmosis
ring
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CN201410734376.5A
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CN104594333B (en
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孙召花
高明军
胡松
刘贺
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Hohai University HHU
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Hohai University HHU
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/11Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2200/00Geometrical or physical properties
    • E02D2200/17Geometrical or physical properties including an electric conductive element

Abstract

The invention discloses a treatment method for soft clay foundations of annular electroosmosis single well drainage. The method comprises the steps of excavating a single well, driving electrodes, conducting electroosmosis, conducting drainage and the like, wherein electrode annular arrays are driven into the soft clay foundations for multiple circles and distributed in the shape of a plum blossom; each circle of the electrodes is connected separately through a wire, the outermost circle of the wire is connected with a positive pole of a direct-current power supply, and a circle, next to the outermost circle, of the wire is connected with the negative pole of the direct-current power supply; circular electroosmotic flow from outside to inside is formed in clay through turning on the direct-current power supply, so that each two adjacent circles of electrodes are electrified from outside to inside in sequence; electroosmosis steps above are repeated till the water in the soft clay in the treatment scope is drained into the single well, and the water in the single well is drained into the earth surface. According to the treatment method for soft clay foundations of annular electroosmosis single well drainage, the operation is simple, and drainage reinforcement of the soft clay foundations is applicable.

Description

The Soft Clay Foundation processing method of ring-type electric osmose individual well draining
Technical field
The present invention relates to a kind of drain reinforcing method of Soft Clay Foundation, be specifically related to the Soft Clay Foundation processing method of a kind of ring-type electric osmose individual well draining, belong to geotechnical engineering field.
Background technology
In southeastern coast and some hinterland of China, Soft Clay Foundation extensively distributes, and the feature of soft clay is that moisture content is high, compressibilty is high, intensity is low, bad hydraulic permeability.High-compressibility causes ground to have sizable sedimentation and differential settlement, and hypotonicity makes the duration of sedimentation very long, may affect the normal use of building, and low-intensity makes bearing capacity of foundation soil and stability can not engineering demands.
The conventional discharging consolidation method such as vacuum preloading, piling prepressing processes Soft Clay Foundation, the raising of vacuum preloading to bearing capacity of foundation soil is limited, higher to the construction requirement on process border, there is preloading material source deficiency and may cause the problems such as foundation instability in piling prepressing.Consolidation is limited to the factor such as low hydraulic conductivity and high sticky content of soft clay, and the duration is longer, and is difficult to produce a desired effect.
Electroosmotic drainage is by applying to the electrode inserted in the soil body a kind of method for processing foundation that low-voltage DC accelerates discharging consolidation, because electro osmosis coefficient and the radii of soil particles of electroosmotic drainage have nothing to do, is considered to the effective ways of process Soft Clay Foundation.Reinforcement mechanism with vacuum method is similar, and consolidation by electroosmosis is also when keeping soil body total stress constant, improves effective stress by producing negative excess pore water pressure, therefore can not cause ground gene Lack of support and unstability.But electroosmotic drainage due to the impact by metal electrode material, and is not applied, the defect that Electro-kinetic Geosynthetics can avoid metal electrode to corrode in electric osmose process widely, makes electroosmotic drainage enter new developing stage.
The soil body forms the horizontal stream from anode to negative electrode in electric osmose process, and power upwards can not be provided to make it discharge soil body surface for the water converging in negative electrode place, thus the soil moisture content existed near anode for the soil body of electroosmotic drainage process reduces greatly, more toward the phenomenon that negative electrode soil moisture content is higher.Thus propose electroosmotic drainage and the combination such as vacuum method, preloading, but the method after combining exists, and construction is complicated, power consumption is large, high cost shortcoming.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides a kind of Soft Clay Foundation processing method of simple to operate, ring-type electric osmose individual well draining that drainage efficiency is high.
Technical scheme: for solving the problems of the technologies described above, the Soft Clay Foundation processing method of ring-type electric osmose individual well provided by the invention draining, comprise excavation individual well, squeeze into the steps such as electroosmosis electrode, electric osmose and draining, it is characterized in that: described electroosmosis electrode with individual well center line for axis, annular array squeeze into Soft Clay Foundation a few; Often enclose electroosmosis electrode all by a wire separate connection, outmost turns and the wire of time outer ring are connected respectively positive pole and the negative pole of dc source, in the soil body, form hoop EOF from outside to inside; Ecto-entad like this is energized to every two adjacent rings electroosmosis electrode successively, and repeat above-mentioned electric osmose treatment step, the water the most at last in the process range soil body enters in individual well, then the water in individual well is discharged earth's surface.
Particularly, above steps operation is as follows:
1) in Soft Clay Foundation, excavation meets the individual well of ground processing requirements, and with individual well center line for axis, in Soft Clay Foundation, annular array squeezes into the electroosmosis electrode that a few become quincunx distribution;
2) connected by all electroosmosis electrode wires, the electroosmosis electrode that need meet same circle is used alone a wire and connects;
3) electroosmosis electrode of outmost turns is connected to the positive pole of dc source, the electroosmosis electrode of secondary outer ring is connected to the negative pole of dc source, forms hoop EOF from outside to inside after power-on in the soil body; After a period of time, powered-down removes wire, then by the positive pole of the Electrode connection power supply of secondary outer ring, in it, the negative pole of the Electrode connection power supply of an adjacent circle, has been energized to often enclosing electrode so successively; Eventually through the electroosmosis electrode around the borehole wall, the water in process range is entered in individual well, the water in individual well is discharged earth's surface by submersible pump and outlet pipe;
4) above-mentioned electric osmose treatment step is repeatedly repeated, until do not have water to flow in individual well.
Particularly, the individual well meeting ground processing requirements is take into full account cutting depth and the radius because usually designing individual well such as field engineering geological condition, electric osmose process range, in order to prevent cave-in, be provided with punching casing in described individual well, described punching casing comprises the filter cloth that pvc pipe outside is located at by the pvc pipe of making aperture and bag.
Particularly, described electroosmosis electrode is vertically squeezed in the soil body perpendicular to foundation surface, squeezes into the treating depth that the soil body degree of depth is ground.
Particularly, described electroosmosis electrode material is Electro-kinetic Geosynthetics, and each electroosmosis electrode is solid or hollow tubular structure.Electroosmosis electrode does not have vertical drainage function
Particularly, the spacing of adjacent annular electroosmosis electrode is 1 ~ 1.5m, and the ring electrode of innermost layer is close to the individual well borehole wall and is squeezed in the soil body.
Particularly, described dc source carries out voltage stabilizing or current stabilization energising to electroosmosis electrode, and the conduction time of two adjacent rings electroosmosis electrode judges according to the moisture content of the inner ring ate electrode soil body.
Particularly, also comprise after step 5) electric osmose is disposed and backfill compacting process is carried out to individual well
Beneficial effect: the present invention is processed clay ground by the draining of ring-type electric osmose individual well, has the following advantages:
The first, the hoop seepage flow formed by electroosmotic drainage, enters in individual well by the water in the soil body, overcoming conventional electroosmotic drainage for converging in the shipwreck at negative electrode place with the problem of discharging, achieving the in-situ processing to Soft Clay Foundation;
The second, the method does not need to combine with the method such as vacuum preloading, piling prepressing, and thus construction is simple, and convenient operation, saves cost simultaneously.And by once carrying out organizing this method, the large-area treatment to Soft Clay Foundation can be realized more.
Except technical problem, the technical characteristic forming technical scheme and the advantage brought by the technical characteristic of these technical schemes that the present invention recited above solves, the advantage that the other technologies feature comprised in the other technologies problem that the Soft Clay Foundation processing method of ring-type electric osmose individual well of the present invention draining can solve, technical scheme and these technical characteristics bring, will be described in more detail by reference to the accompanying drawings.
Accompanying drawing explanation
Fig. 1 is the top view of the embodiment of the present invention;
Fig. 2 is the sectional view of Fig. 1;
Fig. 3 is the structural representation of casing of punching in the embodiment of the present invention;
In figure: 1 Soft Clay Foundation; 2 individual wells; 3 submersible pumps; 4 electroosmosis electrodes; 5 first wires; 6 second wires; 7 privates; 8 inside conductors; 9 most inside conductors; 10 dc sources; 11 positive poles; 12 negative poles; 13 outlet pipes; 14 punching casings.
Detailed description of the invention
Embodiment:
The ring-type electric osmose individual well discharge structure that the embodiment of the present invention adopts on Soft Clay Foundation as depicted in figs. 1 and 2, comprise the Soft Clay Foundation 1 that center has vertical individual well 2, be placed with submersible pump 3 in the shaft bottom of vertical individual well 2, submersible pump 3 is connected with the outlet pipe 13 extended to outside well.Electroosmosis electrode 4 is vertically squeezed in clay ground 1, and with the center line of individual well 2 for axis array distribution in the form of a ring, all electrodes 4 are connected with wire, often enclose electrode 4 and be all connected to into separate one group by same wire, formed ecto-entad arrangement the first wire 5, second wire 6, privates 7, secondary inside conductor 8 and most inside conductor 9.First the first wire 5 is connected to the positive pole 11 of dc source 10, the second wire 6 is connected to negative pole 12.
As shown in Figure 3, in individual well, the borehole wall can be safeguarded by wall liner punching casing 14, prevent from caving in, punching casing 14 by the pvc pipe making aperture again outsourcing filter cloth make
During use, form above-mentioned discharge structure by following construction sequence:
S1: excavation meets the individual well 2 of ground processing requirements in Soft Clay Foundation 1, and puts the submersible pump 3 that is connected with outlet pipe 13 in shaft bottom.
S2: with the center line of individual well 2 for axis, in Soft Clay Foundation 1, annular array squeezes into the electroosmosis electrode 4 of a few quincunx distributions, is connected by all electrodes 4 with wire, often encloses and all connects all electrodes 4 separately through a wire.
S3: the positive pole 11 all electrodes 4 of outmost turns being wired to dc source 10, all electrodes 4 of secondary outer ring are wired to the negative pole 12 of dc source 10, in the soil body, hoop EOF is from outside to inside formed after power-on 10, after a period of time, powered-down 10 removes wire, again the electrode 4 of secondary outer ring is connected the positive pole 11 of power supply 10, in it, the electrode 4 of an adjacent circle connects the negative pole 12 of power supply 10, so be energized to often enclosing electrode 4 successively, eventually through the cathode electrode 4 around the borehole wall, the water in electric osmose process range is entered in individual well 2, water in individual well 2 is discharged earth's surface by submersible pump 3 and outlet pipe 13.
S4: repeatedly repeat above-mentioned electric osmose treatment step.
In step sl, the described individual well 2 meeting ground processing requirements is for considering excavation radius and the degree of depth because usually determining individual well 2 such as electric osmose process range and soft base thickness, the cutting depth of individual well 2 can be foundation treatment depth, and the radius of individual well is 0.5 ~ 1.0m.Punching casing etc. is used to safeguard that the borehole wall prevents from caving in if desired, punching casing 14 by the pvc pipe making aperture again outsourcing filter cloth make, so not only can safeguard that the borehole wall prevents from caving in, the water that electric osmose can also be made to discharge flows in well from the aperture of casing 14, and the filter cloth of outsourcing can stop the earth of the borehole wall to flow in well 2.
In step s 2, described electroosmosis electrode 4 is uncorruptible electronic earth working material, and because this method does not need by negative electrode to top drainage, thus its shape can be solid or hollow tubular structure, the length of electrode 4 is determined by the thickness of weak soil, and external diameter is between 5 ~ 10cm.The vertical soil body surface of multiple electroosmosis electrode 4 annular array is squeezed in soft clay 1, form the electroosmosis electrode 4 of a few quincunx distributions, the electrode of innermost circle is close to individual well 2 borehole wall, electrode 4 spacing of two adjacent rings is 1 ~ 1.5m, electrode 4 number of turns is 10 ~ 20 circles, often enclose and all connect all electrodes 4 separately through a wire, one end of wire is reserved enough length and is connected dc source 10.In the present embodiment, the number of electroosmosis electrode 4 is 78, form the electrode 4 of the quincunx distribution of 6 circle, wherein the number of innermost circle electrode 4 is 8, often an outside circle increase by 2 electrodes 4, and the level interval of two adjacent rings electrode 4 is 1m, all electrodes 4 of innermost circle are connected by most inside conductor 9, all electrodes 4 of secondary inner ring are connected by time inside conductor 8, the like, all electrodes 4 of outmost turns are connected by the first wire 5.
In step s3, described electric osmose process is the positive pole 11 first the first wire 5 being connected dc source 10, second wire 6 is connected the negative pole 12 of dc source 10, carry out electric osmose after power-on 10, the electric osmose time can be determined according to 5% time used of rising of soil moisture content near inner ring electrode 4.After a period of time, powered-down 10 removes wire, again the second wire 6 is connected the positive pole 11 of dc source 10, privates 7 connects the negative pole 12 of dc source 10, proceed electric osmose, so be energized to often enclosing electrode 4 successively, form the EOF of ecto-entad, eventually through the positive pole 11 secondary inside conductor 8 being connected dc source 10, most inside conductor 9 connects the negative pole 12 of dc source 10, water in electric osmose process range is entered in individual well 2, the water in individual well 2 is discharged earth's surface by submersible pump 3 and outlet pipe 13.
In above-mentioned electric osmose process, except the hoop seepage flow centered by individual well 2 formed can reduce the moisture content of the soil body, brine electrolysis can be there is at electrode 4 place be connected with the positive pole 11 and negative pole 12 of power supply 10 and react and produce H +and OH -, thus the adjoint electrochemical reaction that other occur, the gum material of production can reduce the moisture content of the soil body equally.To in the soil body from outside to inside electric osmose process, the electrode 4 often enclosed has time enough intermittently power-on, thus the moisture in the soil body is redistributed, and reduces the interface resistance of anode and the soil body, for next round electric osmose is ready.The step mode of dc source 10 is that voltage stabilizing or current stabilization export, and the size of voltage of voltage regulation or current stabilization electric current is determined according to the resistance of power supply 10 power, the soil body, electrode 4 character, and general power supply 10 output voltage is the safe voltage being no more than 80V.
In step s 4 which, repeatedly can repeat step S3, should guarantee to be energized to adjacent two circle electrodes 4 at every turn, wherein inner ring electrode 4 connects the negative pole 12 of dc source 10, outer ring electrode 4 connects power supply 10 positive pole 11, until do not have water to flow in individual well 2, now electric osmose is disposed, and is processed by individual well 2 by methods such as backfill, compactings.When Soft Clay Foundation 1 processing area is very large, many group the method can be adopted to process soft base simultaneously.
The present embodiment is by the method process Soft Clay Foundation of electric osmose, electroosmosis electrode ring-type is squeezed in the soil body, by certain electric osmose implementation step, enters in individual well by the water in the soil body, effectively have collected the water that electric osmose negative electrode is discharged, achieve the in-situ processing to Soft Clay Foundation.And Soft Clay Foundation processing method provided by the invention is simple to operate, by once carrying out organizing this method, the large-area treatment to Soft Clay Foundation can be realized more.To process coefficient of permeability K=10 -6~ 10 -8the soft clay of cm/s has good consolidation effect, makes the soft foundation after reinforcing have higher bearing capacity.
Below by reference to the accompanying drawings embodiments of the present invention are described in detail, but the present invention is not limited to described embodiment.For those of ordinary skill in the art, in the scope of principle of the present invention and technological thought, embodiment is carried out to these embodiments and carries out multiple change, amendment, replacement and distortion and still fall within the scope of protection of the present invention.

Claims (8)

1. a Soft Clay Foundation processing method for ring-type electric osmose individual well draining, comprise excavation individual well, squeeze into electroosmosis electrode, electric osmose and drain step, it is characterized in that: described electroosmosis electrode with individual well center line for axis, annular array squeeze into Soft Clay Foundation a few; Often enclose electroosmosis electrode all by a wire separate connection, outmost turns and the wire of time outer ring are connected respectively positive pole and the negative pole of dc source, in the soil body, form hoop EOF from outside to inside; Ecto-entad like this is energized to every two adjacent rings electroosmosis electrode successively, and repeat above-mentioned electric osmose treatment step, the water the most at last in the process range soil body enters in individual well, then the water in individual well is discharged earth's surface.
2. the Soft Clay Foundation processing method of ring-type electric osmose individual well according to claim 1 draining, is characterized in that: described step concrete operations are as follows:
1) in Soft Clay Foundation, excavation meets the individual well of ground processing requirements, and with individual well center line for axis, in Soft Clay Foundation, annular array squeezes into the electroosmosis electrode that a few become quincunx distribution;
2) connected by all electroosmosis electrode wires, the electroosmosis electrode that need meet same circle is used alone a wire and connects;
3) electroosmosis electrode of outmost turns is connected to the positive pole of dc source, the electroosmosis electrode of secondary outer ring is connected to the negative pole of dc source, forms hoop EOF from outside to inside after power-on in the soil body; After a period of time, powered-down removes wire, then by the positive pole of the Electrode connection power supply of secondary outer ring, in it, the negative pole of the Electrode connection power supply of an adjacent circle, is energized to often enclosing electrode so successively; Eventually through the electroosmosis electrode around the borehole wall, the water in process range is entered in individual well, the water in individual well is discharged earth's surface by submersible pump and outlet pipe;
4) above-mentioned electric osmose treatment step is repeatedly repeated, until do not have water to flow in individual well.
3. the Soft Clay Foundation processing method of ring-type electric osmose individual well according to claim 2 draining, is characterized in that: be provided with punching casing in described individual well, and described punching casing comprises the filter cloth that pvc pipe outside is located at by the pvc pipe of making aperture and bag.
4. the Soft Clay Foundation processing method of ring-type electric osmose individual well according to claim 1 draining, is characterized in that: described electroosmosis electrode is vertically squeezed in the soil body perpendicular to foundation surface, squeezes into the treating depth that the soil body degree of depth is ground.
5. the Soft Clay Foundation processing method of ring-type electric osmose individual well according to claim 1 draining, it is characterized in that: described electroosmosis electrode material is Electro-kinetic Geosynthetics, each electroosmosis electrode is solid or hollow tubular structure.
6. the Soft Clay Foundation processing method of ring-type electric osmose individual well according to claim 1 draining, is characterized in that: the spacing of adjacent annular electroosmosis electrode is 1 ~ 1.5m, and the ring electrode of innermost layer is close to the individual well borehole wall and is squeezed in the soil body.
7. the Soft Clay Foundation processing method of ring-type electric osmose individual well according to claim 1 draining, it is characterized in that: described dc source carries out voltage stabilizing or current stabilization energising to electroosmosis electrode, and the conduction time of two adjacent rings electroosmosis electrode judges according to the moisture content of the inner ring ate electrode soil body.
8. the Soft Clay Foundation processing method of ring-type electric osmose individual well according to claim 2 draining, is characterized in that: also comprise after step 5) electric osmose is disposed and carry out backfill compacting process to individual well.
CN201410734376.5A 2014-12-08 2014-12-08 The Soft Clay Foundation processing method of ring-type electric osmose individual well draining Expired - Fee Related CN104594333B (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106049416A (en) * 2016-07-18 2016-10-26 河海大学 Solar energy and wind energy combination electroosmosis soft soil reinforcing device
CN106545003A (en) * 2016-11-25 2017-03-29 中交第二航务工程局有限公司 Vacuum-dewatering well contrary sequence method reinforces the construction method of barged-in fill
CN107476285A (en) * 2017-08-01 2017-12-15 南通大学 The apparatus and method of vacuum electroosmosis joint reinforcement Soft Clay Foundation
CN108396730A (en) * 2018-03-10 2018-08-14 杭州渗源环境科技有限公司 A kind of method for processing foundation of gradual energization
CN109465290A (en) * 2019-01-07 2019-03-15 南通大学 System and processing method for repairing heavy metal pollution soil
WO2019227906A1 (en) * 2018-05-30 2019-12-05 山东交通学院 Electro-osmosis treatment method for reducing moisture content of roadbed, and road structure
CN110629741A (en) * 2019-10-08 2019-12-31 兰州交通大学 Method for treating frost heaving and slurry turning of roadbed in frozen soil area

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JPH02243816A (en) * 1989-03-17 1990-09-27 Ohbayashi Corp Improving method for soft ground
CN102926378A (en) * 2012-11-01 2013-02-13 上海港湾基础建设(集团)有限公司 Conductive composite vacuum soft soil reinforcing prepressing method
CN103276719A (en) * 2013-06-09 2013-09-04 河海大学 Apparatus and method for stabilizing clay by microbiological-electroosmosis processes

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02243816A (en) * 1989-03-17 1990-09-27 Ohbayashi Corp Improving method for soft ground
CN102926378A (en) * 2012-11-01 2013-02-13 上海港湾基础建设(集团)有限公司 Conductive composite vacuum soft soil reinforcing prepressing method
CN103276719A (en) * 2013-06-09 2013-09-04 河海大学 Apparatus and method for stabilizing clay by microbiological-electroosmosis processes

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106049416A (en) * 2016-07-18 2016-10-26 河海大学 Solar energy and wind energy combination electroosmosis soft soil reinforcing device
CN106049416B (en) * 2016-07-18 2018-05-04 河海大学 Solar wind-energy combines electric osmose reinforcing soft soil device
CN106545003A (en) * 2016-11-25 2017-03-29 中交第二航务工程局有限公司 Vacuum-dewatering well contrary sequence method reinforces the construction method of barged-in fill
CN106545003B (en) * 2016-11-25 2018-08-14 中交第二航务工程局有限公司 Vacuum-dewatering well contrary sequence method reinforces the construction method of barged-in fill
CN107476285A (en) * 2017-08-01 2017-12-15 南通大学 The apparatus and method of vacuum electroosmosis joint reinforcement Soft Clay Foundation
CN108396730A (en) * 2018-03-10 2018-08-14 杭州渗源环境科技有限公司 A kind of method for processing foundation of gradual energization
WO2019227906A1 (en) * 2018-05-30 2019-12-05 山东交通学院 Electro-osmosis treatment method for reducing moisture content of roadbed, and road structure
CN109465290A (en) * 2019-01-07 2019-03-15 南通大学 System and processing method for repairing heavy metal pollution soil
CN110629741A (en) * 2019-10-08 2019-12-31 兰州交通大学 Method for treating frost heaving and slurry turning of roadbed in frozen soil area

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