CN102776877B - Stepped vacuum drainage consolidation method for ultra-soft soil foundation - Google Patents
Stepped vacuum drainage consolidation method for ultra-soft soil foundation Download PDFInfo
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- CN102776877B CN102776877B CN201210301339.6A CN201210301339A CN102776877B CN 102776877 B CN102776877 B CN 102776877B CN 201210301339 A CN201210301339 A CN 201210301339A CN 102776877 B CN102776877 B CN 102776877B
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Abstract
The invention relates to a stepped vacuum drainage consolidation method for an ultra-soft soil foundation, comprising the following steps of: paving a medium-coarse sand cushion on the to-be-consolidated ultra-soft soil foundation, arranging drainage plates in the to-be-consolidated ultra-soft soil foundation at intervals in a drilling manner, arranging a pore water pressure probe and a settlement mark between every two drainage plates, covering a sealing film and a vacuum jet pump on the upper part of the sand cushion, applying a pressure according to the number of steps from small to large during stepped vacuum pre-pressing, applying the load of the next step after pore water pressure and settlement are stabilized, and sequentially applying all loads in the same manner, thus finishing stepped vacuum drainage consolidation construction for the ultra-soft soil foundation; and via the stepped vacuum drainage consolidation method disclosed by the invention, the problem of the clogging of the drainage plates is effectively overcome, and the reinforcement effect of the ultra-soft soil foundation is improved. Compared with the present drainage consolidation reinforcement for an ultra-soft soil foundation, the stepped vacuum drainage consolidation method is low in project cost, and simple and convenient in operation during a project implementation process; and the problem of the usual failure of vacuum pre-pressing reinforcement for an ultra-soft soil foundation with a high clay content and a high organic matter content is solved.
Description
Technical field:
The present invention relates to a kind of super soft ground reinforcement means, especially the reinforcing of super soft ground height clay high-moisture soft soil foundation.
Background technology
In recent years, along with urbanization process paces are constantly accelerated, large quantities of industrial civil building and various standard highway, railway, harbour, harbour is all in construction, day by day urgent to the demand of land resource, for alleviating the problem of land-based area deficiency, hydraulic reclamation reclamation engineering is constantly carried out in coastal area, the most ideal material of hydraulic reclamation mode is exactly medium coarse sand, and formed a set of more perfect processing method, but in a lot of place, because sand source is in short supply and the needs of construction Shenzhen and Hong Kong mouth, and the needing of bank beach desilting, have to adopt the seabed weak soil (having the soft clay of high clay and high organic) of coastal waters recent deposit as hydraulic reclamation material.But, for the mud that the hydrophily with high clay and high organic is extremely strong, usual practice is in the past the natural sediment consolidation through 3-5 after hydraulic reclamation, formed after duricrust until surface and carry out consolidation process again, the consumption of this epeirogenetic mode on time and financial resources is all very large, how to find a kind of more reasonable, more economical reinforcement technique, just reinforce while hydraulic reclamation, make barged-in fill become the ground with certain bearing capacity as soon as possible from slurry condition consolidation, huge benefits will be brought to reclamation engineering construction.In conjunction with Key Scientific And Technical Problems in the urgent need to address in national economy and social development.
From the domestic and international present Research of barged-in fill, for the hydraulic reclamation material of sand, silty soil, form a kind of more ripe, perfect method, but a lot of method be have employed in the past for this ultra-soft soil, as added the cement mucky soil of the methods such as the curing agent such as cement, traditional vacuum preloading, piling prepressing for those high-hydrophilics of hydraulic reclamation recently, its rapidly solidified effect extreme difference, the as easy as rolling off a log phenomenon producing silting near drain bar.In order to address this problem, the present invention adopts step to apply the method for vacuum pressure to carry out the research of stabilization by drainage barged-in fill.
Summary of the invention:
Object of the present invention is just for above-mentioned the deficiencies in the prior art, provides a kind of
The object of the invention is to be achieved through the following technical solutions:
Super soft ground step vacuum drainage consolidation method, comprises the following steps:
A, waiting that reinforcing super soft ground surrounding is provided with sealing ditch 1, construct bottom of trench and ditch side with clay, the degree of depth of sealing ditch 1 reaches impermeable stratum, is generally 50cm, wide 80cm;
B, lay medium coarse sand bed course 4 waiting to reinforce on super soft ground, the thickness of medium coarse sand bed course 4 is not less than 40cm, as the horizontal drainage layer of vacuum preloading;
C, waiting that reinforcing super soft ground intermediate reach sets drain bar 2, the spacing of drain bar 2 is 70cm-100cm, and the top end face of drain bar 2 is higher than sand bedding course 4 end face 5cm-10cm;
More than one pore water pressure probe 6 and sedimentation mark 7 are installed between d, drain bar 2, pore water pressure probe 6 and sedimentation mark 7, respectively along vertical section distribution, bury a pore water pressure probe 6 or sedimentation mark 7 from treating that reinforcing super soft ground surface is downward underground every 3m-4m;
E, be covered with diaphragm seal 3 on the top of sand bedding course 4, diaphragm seal 3 top is provided with more than one vacuum jet pump 5, by 800-1000m
2lay a vacuum jet pump 5;
F, the power supply connecting jet vacuum pump 5 and vacuum tube, pore water pressure probe 6 is connected with monitoring device respectively with sedimentation mark 7, connects rear turn on pump and implements vacuum preloading construction;
When g, vacuum preloading, step vacuum preloading from small to large, is divided into five step loads, exerts pressure, i.e. 10kPa, 20kPa, 40kPa, 60kPa, 80kPa by progression;
H, step vacuum preloading, aspirate by jet vacuum pump the last 5 negative pressure caused to carry out load, first load 10kPa vacuum preloading power, load is read by vacuum meter, monitored by pore water pressure probe 6 and sedimentation mark 7, after pore water pressure and settlement stability, apply next progression load again, by that analogy, apply the full load of the progression of exerting pressure designed by step g from small to large successively, unload after treating pore water pressure and settlement stability, super soft ground step vacuum drainage consolidation has been constructed.
According to pore water pressure probe 6 and the monitoring record of sedimentation mark 7, draw out pore water pressure, sedimentation and accumulated time curve, find out the relation of drainage channel formation time and pressure, determine that the pass of ultra-soft soil structure intensity and time is that engineering design provides reliable design parameter.
The power of described jet vacuum pump 5 is 7.5kw.
Beneficial effect: the present invention is applicable to the weak soil of recent deposit, the vacuum method of the contour clay content of barged-in fill, high organic content super soft ground, vacuum preloading combine the process of ground with preloading, the principle of initial structural strength is formed with weak soil under low-pressure, carry out discharging consolidation under low-pressure again, reduce the silting effect of fine particle in the soil body, ultra-soft soil is reinforced step by step, finally forms the ground with some strength.Effectively overcome a difficult problem for drain bar silting, improve the consolidation effect of super soft ground.Compared with reinforcing with existing super soft ground discharging consolidation, construction costs is low, and project implementing process is easy and simple to handle, solves high clay content, the frequent failed problem of high organic content super soft ground vacuum pre-press reinforcing foundation.
Accompanying drawing explanation
Fig. 1 is that super soft ground step vacuum drainage consolidation method implements work schematic diagram
1 sealing ditch, 2 drain bars, 3 diaphragm seals, 4 sand bedding courses, 5 jet vacuum pumps, 6 pore water pressure probes, 7 sedimentation marks
Detailed description of the invention
Be described in further detail below in conjunction with drawings and Examples:
Super soft ground step vacuum drainage consolidation method, comprises the following steps:
A, waiting that reinforcing super soft ground surrounding is provided with sealing ditch 1, construct bottom of trench and ditch side with clay, the degree of depth of sealing ditch 1 reaches impermeable stratum, is generally 50cm, wide 80cm;
B, lay medium coarse sand bed course 4 waiting to reinforce on super soft ground, the thickness of medium coarse sand bed course 4 is not less than 40cm, as the horizontal drainage layer of vacuum preloading;
C, waiting that reinforcing super soft ground intermediate reach sets drain bar 2, the spacing of drain bar 2 is 70cm-100cm, and the top end face of drain bar 2 is higher than sand bedding course 4 end face 5cm-10cm;
More than one pore water pressure probe 6 and sedimentation mark 7 are installed between d, drain bar 2, pore water pressure probe 6 and sedimentation mark 7, respectively along vertical section distribution, bury a pore water pressure probe 6 or sedimentation mark 7 from treating that reinforcing super soft ground surface is downward underground every 3m-4m;
E, be covered with diaphragm seal 3 on the top of sand bedding course 4, it is 7.5kw vacuum jet pump 5 that diaphragm seal 3 top is provided with more than one power, by 800-1000m
2lay a vacuum jet pump 5;
F, the power supply connecting jet vacuum pump 5 and vacuum tube, pore water pressure probe 6 is connected with monitoring device respectively with sedimentation mark 7, connects rear turn on pump and implements vacuum preloading construction;
When g, vacuum preloading, step vacuum preloading from small to large, is divided into five step loads, exerts pressure, i.e. 10kPa, 20kPa, 40kPa, 60kPa, 80kPa by progression;
H, step vacuum preloading, aspirate by jet vacuum pump the last 5 negative pressure caused to carry out load, first load 10kPa vacuum preloading power, load is read by vacuum meter, monitored by pore water pressure probe 6 and sedimentation mark 7, after pore water pressure and settlement stability, apply next progression load again, by that analogy, apply the full load of the progression of exerting pressure designed by step g from small to large successively, unload after treating pore water pressure and settlement stability, super soft ground step vacuum drainage consolidation has been constructed.
According to pore water pressure probe 6 and the monitoring record of sedimentation mark 7, draw out pore water pressure, sedimentation and accumulated time curve, find out the relation of drainage channel formation time and pressure, determine that the pass of ultra-soft soil structure intensity and time is that engineering design provides reliable design parameter.
Embodiment 1
Extra large building site is filled out in Binhai New Area in Tianjin: the nearly 5000m of pre-reinforcement super soft ground area
2, the dark 5.2m of pre-reinforcement super soft ground.
A, waiting that reinforcing super soft ground surrounding is provided with sealing ditch 1, constructs bottom of trench and ditch side with clay, the dark 50cm of sealing ditch 1, wide 80cm;
B, lay medium coarse sand bed course 4, the thickness 40cm of medium coarse sand bed course 4, as the horizontal drainage layer of vacuum preloading waiting to reinforce on super soft ground;
C, to wait to reinforce in super soft ground by plum blossom point, equidistantly setting drain bar 2, the spacing of drain bar 2 is 70cm, and the top end face of drain bar 2 is higher than sand bedding course 4 end face 10cm;
Be provided with 2 pore water pressure probes, 6 and 2 sedimentation marks 7 between d, drain bar 2, pore water pressure probe 6 and sedimentation mark 7 distribute along vertical section respectively;
E, be covered with diaphragm seal 3 on the top of sand bedding course 4, it is 7.5kw vacuum jet pump 5 that diaphragm seal 3 top fills 6 power, by 800-1000m
2lay a vacuum jet pump 5;
F, the power supply connecting jet vacuum pump 5 and vacuum tube, pore water pressure probe 6 is connected with monitoring device respectively with sedimentation mark 7, connects rear turn on pump and implements vacuum preloading construction;
When g, vacuum preloading, step vacuum preloading from small to large, is divided into five step loads, exerts pressure, i.e. 10kPa, 20kPa, 40kPa, 60kPa, 80kPa by progression;
H, step vacuum preloading, aspirate by jet vacuum pump the last 5 negative pressure caused to carry out load, first load 10kPa vacuum preloading power, load is read by vacuum meter, monitored by pore water pressure probe 6 and sedimentation mark 7, after pore water pressure and settlement stability, apply next progression load again, by that analogy, apply the full load of the progression of exerting pressure designed by step g from small to large successively, unload after treating pore water pressure and settlement stability, super soft ground step vacuum drainage consolidation has been constructed;
Embodiment 2
Building site, phase seashore, great Yao gulf three, Dalian: the nearly 10000m of pre-reinforcement super soft ground area
2, the dark 15.2m of pre-reinforcement super soft ground.
A, waiting that reinforcing super soft ground surrounding is provided with sealing ditch 1, constructs bottom of trench and ditch side with clay, the dark 50cm of sealing ditch 1, wide 80cm;
B, lay medium coarse sand bed course 4, the thickness 40cm of medium coarse sand bed course 4, as the horizontal drainage layer of vacuum preloading waiting to reinforce on super soft ground;
C, waiting to reinforce in super soft ground, by plum blossom point, equidistantly setting drain bar 2, the spacing of drain bar 2 is 90cm, and the top end face of drain bar 2 is higher than sand bedding course 4 end face 5cm;
Be provided with 5 pore water pressure probes, 6 and 5 sedimentation marks 7 between d, drain bar 2, pore water pressure probe 6 and sedimentation mark 7 distribute along vertical section respectively;
E, be covered with diaphragm seal 3 on the top of sand bedding course 4, it is 7.5kw vacuum jet pump 5 that diaphragm seal 3 top fills 11 power;
F, the power supply connecting jet vacuum pump 5 and vacuum tube, pore water pressure probe 6 is connected with monitoring device respectively with sedimentation mark 7, connects rear turn on pump and implements vacuum preloading construction;
When g, vacuum preloading, step vacuum preloading from small to large, is divided into five step loads, exerts pressure, i.e. 10kPa, 20kPa, 40kPa, 60kPa, 80kPa by progression;
H, step vacuum preloading, aspirate by jet vacuum pump the last 5 negative pressure caused to carry out load, first load 10kPa vacuum preloading power, load is read by vacuum meter, monitored by pore water pressure probe 6 and sedimentation mark 7, after pore water pressure and settlement stability, apply next progression load again, by that analogy, apply the full load of the progression of exerting pressure designed by step g from small to large successively, unload after treating pore water pressure and settlement stability, super soft ground step vacuum drainage consolidation has been constructed.
According to pore water pressure probe 6 and the monitoring record of sedimentation mark 7, draw out pore water pressure, sedimentation and accumulated time curve, find out the relation of drainage channel formation time and pressure, determine that the pass of ultra-soft soil structure intensity and time is that engineering design provides reliable design parameter.
Claims (2)
1. a super soft ground step vacuum drainage consolidation method, is characterized in that, comprise the following steps:
A, waiting that reinforcing super soft ground surrounding is provided with sealing ditch (1), construct bottom of trench and ditch side with clay, the degree of depth of sealing ditch (1) reaches impermeable stratum, and sealing ditch (1) is 50cm, wide 80cm deeply;
B, lay medium coarse sand bed course (4) waiting to reinforce on super soft ground, the thickness of medium coarse sand bed course (4) is not less than 40cm, as the horizontal drainage layer of vacuum preloading;
C, waiting that reinforcing super soft ground intermediate reach sets drain bar (2), the spacing of drain bar (2) is 70cm-100cm, and the top end face of drain bar (2) is higher than sand bedding course (4) end face 5cm-10cm;
More than one pore water pressure probe (6) and sedimentation mark (7) are installed between d, drain bar (2), pore water pressure probe (6) and sedimentation mark (7), respectively along vertical section distribution, bury pore water pressure probe (6) or a sedimentation mark (7) from treating that reinforcing super soft ground surface is downward underground every 3m-4m;
E, be covered with diaphragm seal (3) on the top of sand bedding course (4), diaphragm seal (3) top is provided with more than one vacuum jet pump (5), lays a vacuum jet pump (5) by 800-1000 ㎡;
F, the power supply connecting jet vacuum pump (5) and vacuum tube, pore water pressure probe (6) is connected with monitoring device respectively with sedimentation mark (7), connects rear turn on pump and implements vacuum preloading construction;
When g, vacuum preloading, step vacuum preloading from small to large, is divided into five step loads, exerts pressure by progression, be i.e. 10 kPa, 20 kPa, 40 kPa, 60 kPa, 80 kPa;
H, step vacuum preloading, aspirate by force by jet vacuum pump (5) negative pressure caused to carry out load, first load 10kPa vacuum preloading power, load is read by vacuum meter, by pore water pressure probe (6) and sedimentation mark (7) monitoring, after pore water pressure and settlement stability, apply next progression load again, by that analogy, apply the full load of the progression of exerting pressure designed by step g from small to large successively, unload after treating pore water pressure and settlement stability, super soft ground step vacuum drainage consolidation has been constructed.
2., according to a kind of super soft ground step vacuum drainage consolidation method according to claim 1, it is characterized in that, the power of described jet vacuum pump (5) is 7.5kw.
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Families Citing this family (6)
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| CN103628464B (en) * | 2013-10-25 | 2016-05-11 | 中交天津港湾工程研究院有限公司 | A kind of drainage arrangement distribution method of bleeding of applicable Soft Ground Improved By Vacuum Preloading processing |
| CN106436680B (en) * | 2016-05-13 | 2018-07-13 | 南京盼源工程技术有限公司 | Blowing-filling sludge positive/negative-pressure quick consolidation method based on strength control |
| CN107245998B (en) * | 2017-06-30 | 2019-10-18 | 山东科技大学 | A kind of method of cocoanut shell filling combined vacuum prepressing blowing filling soil base |
| CN108642768B (en) * | 2018-06-15 | 2021-07-09 | 中原工学院 | Preparation method of moisture-absorbing and sweat-releasing fabric based on viscose fibers |
| CN114278300B (en) * | 2022-01-28 | 2023-09-15 | 六盘水师范学院 | Method for repairing coal mining damaged water-proof soil layer through vacuum preloading of thin sand layer coverage area |
| CN116289868A (en) * | 2023-05-12 | 2023-06-23 | 中交第四航务工程勘察设计院有限公司 | Vacuum preloading method based on machine-made gravel material |
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