CN109667260A - A kind of reinforcement system and its construction method based on soft foundation discharge fixing - Google Patents
A kind of reinforcement system and its construction method based on soft foundation discharge fixing Download PDFInfo
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- CN109667260A CN109667260A CN201910016132.6A CN201910016132A CN109667260A CN 109667260 A CN109667260 A CN 109667260A CN 201910016132 A CN201910016132 A CN 201910016132A CN 109667260 A CN109667260 A CN 109667260A
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- Prior art keywords
- soft
- soft soil
- short close
- sand drain
- sand
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
Abstract
The invention discloses a kind of reinforcement systems based on soft foundation discharge fixing, including several short close sand drain, horizontal drainage bed course and strong rammer packing layers；Several described short close sand drains are evenly distributed between soft soil foundation top surface line and soft soil foundation bottom surface line, and horizontal drainage bed course is provided on the line of soft soil foundation top surface, strong rammer packing layer is provided on horizontal drainage bed course；The present invention can effectively solve the problem that the problem of soft soil base sedimentation, take full advantage of more rich river (river) sand resource, reduces land Logistics Park large area basement process engineering construction cost, shortens the construction period；Compared with conventional Ground Treatment Schemes, heavy-tamping method and short close sand drain cost are lower, short close sand drain has the advantages that sand compaction pile and common sand drain, it can not only accelerate the discharging consolidation of soft soil foundation, itself also play a part of to replace weak soil, control settlement effect is obvious, saves project amount and the time of the preloading earthwork, reduces basement process construction cost and duration.
Description
Technical field
The present invention relates to the soft soil foundation in civil construction project, especially a kind of adding based on soft foundation discharge fixing
Solid system and its construction method are suitable for shallow layer soft soil foundation.
Background technique
For natural soft soil foundation, soft soil base sedimentation is mainly solved the problems, such as.There are many kinds of method for processing foundation, including changes
Fill out Sand-gravel-cushion Technioue, pre-pressure drainage consolidation method, compound foundation method, chemical stabilization etc..Compound foundation method includes that sand pile, vibroflotation are (or heavy
Pipe) broken stone pile, lime soil pile etc., large-area treatment is costly, and the construction period is also long, is unable to satisfy engineering cost and duration
Requirement；Chemical stabilization includes grouting method, jet groutinl method, deep mixing method etc., and cost is generally higher, also not to environmental protection
Benefit；Pre-pressure drainage consolidation method is mainly used for engineering of reclaiming fields from the sea, heap material containing source as relatively inexpensive, effective reinforcement measure
Generally compared with horn of plenty.And as land Logistics Park large area foundation treatment engineering, due to high quality filler scarcity and environmental protection etc.
It is required that long range muck haulage, will cause being significantly increased for construction cost.Therefore, Master Cost is higher causes pre-pressure drainage consolidation method
Foundation treatment engineering is also by certain application limitation by land.
Summary of the invention
In order to solve the above-mentioned technical problem, the invention proposes a kind of reinforcement system based on soft foundation discharge fixing and
Its construction method solves land Logistics Park large area foundation treatment engineering, because backfilling material shortage leads to common ground
Processing method application limitation problem, the method have the advantages that sand compaction pile and common sand drain, have stronger economy, duration
Short, convenient for construction and quality control, control settlement effect is obvious.
The technical solution for realizing the aim of the invention is as follows:
A kind of reinforcement system based on soft foundation discharge fixing, which is characterized in that including several short close sand drains, horizontal drainage
Bed course and strong rammer packing layer；Several described short close sand drains are evenly distributed in soft soil foundation top surface line and soft soil foundation bottom surface line
Between, it is provided with horizontal drainage bed course on the line of soft soil foundation top surface, strong rammer packing layer is provided on horizontal drainage bed course.
Preferably, several described short close square arrangements of sand drain, the spacing of two neighboring short close sand drain are 1.5m.
Preferably, the diameter of the short close sand drain is 30cm, and the length of short close sand drain is 4m-6m, the hole diameter of short close sand drain
Than being not more than 5.
A kind of construction method of the reinforcement system based on soft foundation discharge fixing, which comprises the following steps:
S001: place should carry out earth's surface cleaning to land area before being formed, by plants such as tree root, weeds on original ground and all kinds of
Building waste is all removed completely, and the land drainage of water retaining dike and each construction subregion, gear are then constructed according to on-site actual situations
Earth embankment is available locally；
S002: according to the distribution of soft soil characteristics and upper load, the short close sand drain of reasonable Arrangement determines optimal short Mi Shajingjing
Deep, well spacing；Using the short close sand drain of vibration compaction method injection, the casing with valve pipe is penetrated into soft soil foundation with vibration hammer and is entered firmly
Then soil layer fills sand in casing, while drawing out vibration forms short close sand drain；Then sand is taken from sand source, waterpower hydraulic reclamation is to land
Area, hydraulic reclamation absolute altitude can be according to on-site actual situations appropriate adjustments；
S003: before carrying out large area dynamic consolidation construction to soft soil foundation, first one piece of representative region is selected to carry out examination rammer；According to phase
Design parameter is rammed in pass experience, examination are as follows: three times points ram+time cape rammer, and first, second time point compacting row is jumped and rammed, its spacing be 6m ×
6m, it is every to be rammed complete rear screed all over point and print square arrangement, third all over point ram after arrange in blossom type, its spacing be 6m ×
3m；It is 800 kJ -1200kJ that point, which rams energy, and ramming number is 2 times -4 times, and every intermittent time rammed all over point is -5 days 3 days；Point rams
After carry out a cape rammer again, cape rammer is rammed using overlap joint, it is desirable that rams print overlap joint as 1/4 hammer bottom diameter, cape rammer, which often hits rammer, to be
1000KN.m, every 2 is hit.
Preferably, the hydraulic reclamation absolute altitude is 1m-2m.
Compared with prior art, the present invention its remarkable advantage:
(1) the comprehensive respective advantage and the scope of application for using heavy-tamping method and short close sand drain method consolidated subsoil of the present invention, with instantaneous
The method of part plus dynamic load carries out power loading to soft soil foundation, makes the soil body under the action of dynamic load, is made with the sand drain set
For the gap formed when vertical drainage channel and strong rammer, make the pore water pressure dissipation of weak soil, generates consolidation settlement, so as to improve
The efficiency of soil body physico-mechanical properties；After short close sand drain improvement, the main function of short close sand drain is to accelerate soft soft soil foundation
Native discharging consolidation, compared with common sand drain, short close sand drain itself also plays a part of to replace weak soil, and control settlement effect is obvious, energy
It is enough effectively to solve the problems, such as soft soil base sedimentation.
(2) present invention makes full use of more rich river (river) sand resource, reduces land Logistics Park large area basement process
Engineering construction cost, shortens the construction period；Compared with conventional Ground Treatment Schemes, heavy-tamping method and short close sand drain cost are lower, simultaneously
Project amount and the time for saving the preloading earthwork, reduce basement process construction cost and duration.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is required attached drawing in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is that the present invention is based on the structural schematic diagrams of the reinforcement system of soft foundation discharge fixing.
Fig. 2 is that the present invention is based on the structural schematic diagrams of close sand drain short in the reinforcement system of soft foundation discharge fixing.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the present invention is illustrated by taking certain harbour hinge economy area as an example, and soft soil foundation is Muddy Bottoms in the present embodiment
Silty clay, natural moisture content 39.4%, natural void ratio 1.093,4 ~ 6m of soft soil foundation average thickness.Place is through basement process
Settlement after construction afterwards is less than 30cm, while according to the requirement of construction unit, large area foundation treatment engineering must be tied within half a year
Beam, and no more than estimated cost.In order to meet the requirement in place, how to accelerate soft foundation discharge fixing, effectively control
Soft soil base sedimentation processed, and save construction cost and duration and seem particularly significant.
Embodiment 1:
As depicted in figs. 1 and 2, a kind of reinforcement system based on soft foundation discharge fixing, several short close sand drains 1, horizontal row
Water subfill 2 and strong rammer packing layer 3；Several described short close sand drains 1 are evenly distributed in soft soil foundation top surface line 4 and soft soil foundation
Between bottom surface line 5, it is provided with horizontal drainage bed course 2 on soft soil foundation top surface line 4, is provided with strong rammer on horizontal drainage bed course 2
Packing layer 3.
Several described square arrangements of short close sand drain 1, the spacing of two neighboring short close sand drain 1 are 1.5m.
The diameter of the short close sand drain 1 is 30cm, and the length of short close sand drain 1 is 4m-6m, and the drain spacing ratio of short close sand drain 1 is not
Greater than 5.
A kind of construction method of the reinforcement system based on soft foundation discharge fixing, comprising the following steps:
S001: place should carry out earth's surface cleaning to land area before being formed, by plants such as tree root, weeds on original ground and all kinds of
Building waste is all removed completely, and the land drainage of water retaining dike and each construction subregion, gear are then constructed according to on-site actual situations
Earth embankment is available locally；
S002: according to the distribution of soft soil characteristics and upper load, the short close sand drain of reasonable Arrangement determines optimal short Mi Shajingjing
Deep, well spacing；Using the short close sand drain of vibration compaction method injection, the casing with valve pipe is penetrated into soft soil foundation with vibration hammer and is entered firmly
Then soil layer fills sand in casing, while drawing out vibration forms short close sand drain；Then sand is taken from sand source, waterpower hydraulic reclamation is to land
Area, hydraulic reclamation absolute altitude can be 1m-2m according to on-site actual situations appropriate adjustment, hydraulic reclamation absolute altitude；
S003: before carrying out large area dynamic consolidation construction to soft soil foundation, first one piece of representative region is selected to carry out examination rammer；According to phase
Design parameter is rammed in pass experience, examination are as follows: three times points ram+time cape rammer, and first, second time point compacting row is jumped and rammed, its spacing be 6m ×
6m, it is every to be rammed complete rear screed all over point and print square arrangement, third all over point ram after arrange in blossom type, its spacing be 6m ×
3m；It is 800 kJ -1200kJ that point, which rams energy, and ramming number is 2 times -4 times, and every intermittent time rammed all over point is -5 days 3 days；Point rams
After carry out a cape rammer again, cape rammer is rammed using overlap joint, it is desirable that rams print overlap joint as 1/4 hammer bottom diameter, cape rammer, which often hits rammer, to be
1000KN.m, every 2 is hit.
In conclusion the comprehensive respective advantage for using heavy-tamping method and short close sand drain method consolidated subsoil of the present invention and applicable model
It encloses, the method for dynamic load is added with instantaneous part, power loading is carried out to soft soil foundation, makes the soil body under the action of dynamic load, to beat
If sand drain as vertical drainage channel and strong rammer when the gap that is formed, make the pore water pressure dissipation of weak soil, it is heavy to generate consolidation
Drop, so as to improve the efficiency of soil body physico-mechanical properties；Soft soil foundation is after short close sand drain improvement, the main function of short close sand drain
It is to accelerate weak soil discharging consolidation, compared with common sand drain, short close sand drain itself also plays a part of to replace weak soil, control settlement effect
The problem of fruit is obvious, can effectively solve the problem that soft soil base sedimentation；The present invention makes full use of more rich river (river) sand resource, reduces
Land Logistics Park large area basement process engineering construction cost, shortens the construction period；Compared with conventional Ground Treatment Schemes, strong rammer
Method and short close sand drain cost are lower, while saving project amount and the time of the preloading earthwork, reduce basement process construction cost
And the duration.
Particular embodiments described above, the technical issues of to solution of the invention, technical scheme and beneficial effects carry out
It is further described, it should be understood that the above is only a specific embodiment of the present invention, is not limited to
The present invention, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in this
Within the protection scope of invention.
Claims (5)
1. a kind of reinforcement system based on soft foundation discharge fixing, which is characterized in that including several short close sand drains (1), water
Flat raft water subfill (2) and strong rammer packing layer (3)；Several described short close sand drains (1) are evenly distributed in soft soil foundation top surface line
(4) between soft soil foundation bottom surface line (5), horizontal drainage bed course (2), horizontal row are provided on soft soil foundation top surface line (4)
Strong rammer packing layer (3) are provided on water subfill (2).
2. the reinforcement system according to claim 1 based on soft foundation discharge fixing, which is characterized in that it is described several
The square arrangement of short close sand drain (1), the spacing of two neighboring short close sand drain (1) are 1.5m.
3. the reinforcement system according to claim 1 or 2 based on soft foundation discharge fixing, which is characterized in that described short
The diameter of close sand drain (1) is 30cm, and the length of short close sand drain (1) is 4m-6m, and the drain spacing ratio of short close sand drain (1) is not more than 5.
4. a kind of construction method of the reinforcement system according to claim 1 based on soft foundation discharge fixing, feature
It is, comprising the following steps:
S001: place should carry out earth's surface cleaning to land area before being formed, by plants such as tree root, weeds on original ground and all kinds of
Building waste is all removed completely, and the land drainage of water retaining dike and each construction subregion, gear are then constructed according to on-site actual situations
Earth embankment is available locally；
S002: according to the distribution of soft soil characteristics and upper load, the short close sand drain of reasonable Arrangement determines optimal short Mi Shajingjing
Deep, well spacing；Using the short close sand drain of vibration compaction method injection, the casing with valve pipe is penetrated into soft soil foundation with vibration hammer and is entered firmly
Then soil layer fills sand in casing, while drawing out vibration forms short close sand drain；Then sand is taken from sand source, waterpower hydraulic reclamation is to land
Area, hydraulic reclamation absolute altitude can be according to on-site actual situations appropriate adjustments；
S003: before carrying out large area dynamic consolidation construction to soft soil foundation, first one piece of representative region is selected to carry out examination rammer；According to phase
Design parameter is rammed in pass experience, examination are as follows: three times points ram+time cape rammer, and first, second time point compacting row is jumped and rammed, its spacing be 6m ×
6m, it is every to be rammed complete rear screed all over point and print square arrangement, third all over point ram after arrange in blossom type, its spacing be 6m ×
3m；It is 800 kJ -1200kJ that point, which rams energy, and ramming number is 2 times -4 times, and every intermittent time rammed all over point is -5 days 3 days；Point rams
After carry out a cape rammer again, cape rammer is rammed using overlap joint, it is desirable that rams print overlap joint as 1/4 hammer bottom diameter, cape rammer, which often hits rammer, to be
1000KN.m, every 2 is hit.
5. the construction method of the reinforcement system according to claim 4 based on soft foundation discharge fixing, which is characterized in that
The hydraulic reclamation absolute altitude is 1m-2m.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910016132.6A CN109667260A (en) | 2019-01-08 | 2019-01-08 | A kind of reinforcement system and its construction method based on soft foundation discharge fixing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910016132.6A CN109667260A (en) | 2019-01-08 | 2019-01-08 | A kind of reinforcement system and its construction method based on soft foundation discharge fixing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114411467A (en) * | 2022-03-31 | 2022-04-29 | 山西机械化建设集团有限公司 | Construction method of high-liquid limit soil filler high-fill skeleton stress and drainage system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN209760216U (en) * | 2019-01-08 | 2019-12-10 | 中交物流规划设计研究院有限公司 | reinforcement system based on soft soil foundation drainage consolidation |
-
2019
- 2019-01-08 CN CN201910016132.6A patent/CN109667260A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209760216U (en) * | 2019-01-08 | 2019-12-10 | 中交物流规划设计研究院有限公司 | reinforcement system based on soft soil foundation drainage consolidation |
Non-Patent Citations (2)
| Title |
|---|
| 吕良等: "探究动静力排水固结法在淤泥质地基工程中的应用", 《中华居民》, vol. 2, pages 1087 - 236 * |
| 李彰明等: "动力排水固结法处理软弱地基", 《施工技术》, pages 30 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114411467A (en) * | 2022-03-31 | 2022-04-29 | 山西机械化建设集团有限公司 | Construction method of high-liquid limit soil filler high-fill skeleton stress and drainage system |
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