CN107090842A - A kind of processing method of the big thickness collapsible loess foundation in subway station - Google Patents
A kind of processing method of the big thickness collapsible loess foundation in subway station Download PDFInfo
- Publication number
- CN107090842A CN107090842A CN201710351885.3A CN201710351885A CN107090842A CN 107090842 A CN107090842 A CN 107090842A CN 201710351885 A CN201710351885 A CN 201710351885A CN 107090842 A CN107090842 A CN 107090842A
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- Prior art keywords
- bed course
- diaphram wall
- collapsibility
- processing method
- fill
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/34—Foundations for sinking or earthquake territories
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
- E02D31/025—Draining membranes, sheets or fabric specially adapted therefor, e.g. with dimples
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
- E02D31/04—Watertight packings for use under hydraulic pressure
Abstract
The present invention relates to a kind of processing method of the big thickness collapsible loess foundation in subway station, this method includes：Along subway station（1）Ground periphery sets diaphram wall（3）；Yellow soil horizon of collapsibility is made using pre- immersion mode（5）Self-weight collapsible sedimentation is carried out, and the epibasal tier soil body carries out consolidation process over the ground after sedimentation and deformation is stable；In back fill course（10）On fill waterproof bed course（11）；In diaphram wall（3）Outside vertical opens up inlet well（4）；In waterproof bed course（11）And inlet well（4）On fill water guide bed course（12）, and set wherein and inlet well（4）The horizontal drain pipe being connected（2）；In water guide bed course（12）On fill the bed course that blocks water（13）.The present invention considers "+draining of soaking+block water " three aspect, reduces the influence that the factors such as rainfall and the underground water in later stage are produced to the yellow soil horizon of collapsibility in ground, effectively reduces the possibility that saturated yielding occurs again for yellow soil horizon of collapsibility.
Description
Technical field
The present invention relates to big thickness collapsible loess foundation processing technology field, more particularly to a kind of big thickness in subway station
The processing method of collapsible loess foundation.
Background technology
It is well known that collapsible loess is a kind of special geology soil, its soil property is more uniform, short texture, pores'growth, tool
There is higher water sensitivity.When not by water-soaked, common intensity is higher, and compressibility is smaller, when under a certain pressure by water-soaked,
Soil structure can be destroyed rapidly, produce larger additional sinking, and intensity is reduced rapidly.
China's loess area coverage accounts for the 6.6% of China's territory area, the Northwest is China up to 640,000 square kilometres
The main Distribution Area of loess, loess thickness is from several meters to more than 400 meters, generally 100m or so.In recent years, in order to alleviate city
Traffic congestion pressure, increasing city starts to build subway, and the western provincial capital such as Xi'an, Lanzhou has also begun to ground ironworker
The construction of journey, due to the special geologic condition of collapsible loess, the more common soil base of method when handling Subway station groundwork
Certainly it is different.
The processing mode of big thickness collapsible loess foundation is varied, for different engineering characteristics and requirement, selects
Suitable processing method is extremely important.Dynamically high energy level compaction, DDC methods（Deep dynamic compaction inside pile hole）, compacting method and presoaking etc.
All be the big effective method of thickness collapsible loess foundation of processing, but these methods there is also treatment effect it is bad, apply
The limitation such as work difficulty is big or construction costs is expensive, in this regard, Wang Jizhong proposes a kind of processing side of big thickness collapsible loess
Method（CN 105970911A）：First loess formation is entered saturated yielding state in advance using water flooding regime in stake, allow loess formation to be conducted oneself with dignity
Settlement by soaking is settled, after it is determined that the sedimentation and deformation of loess formation is stable, and using filler compacting method or strong poor method, epibasal tier is native over the ground
Body carries out consolidation process.This is actually the processing method that one kind considers " pre- immersion ", and still, this processing method can not be protected
The settlement by soaking of card yellow soil horizon of collapsibility is all eliminated, in the presence of the factor such as the rainfall in later stage and underground water, and settlement by soaking is yellow
Saturated yielding may occur again for soil layer, so as to cause structural damage.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of processing of the big thickness collapsible loess foundation in subway station
Method, what this processing method can reduce that after immersion self-weight collapsible sedimentation in advance saturated yielding occurs again for yellow soil horizon of collapsibility can
Energy property, and then ensure the stability of whole ground.
To solve the above problems, a kind of processing side of the big thickness collapsible loess foundation in subway station of the present invention
Method, this method comprises the following steps：
Step S1, it is determined that after the scope of Subway station groundwork, set one to enclose diaphram wall along ground periphery, wherein, it is described
Diaphram wall is core wall and its bottom penetrates yellow soil horizon of collapsibility into non-yellow soil horizon of collapsibility；
Step S2, using pre- immersion mode the yellow soil horizon of collapsibility is set to carry out self-weight collapsible sedimentation, and it is steady in sedimentation and deformation
The epibasal tier soil body carries out consolidation process over the ground after fixed；
Step S3, being constructed in excavation of subway foundation pit, subway main body structure and accessory structure completes and after back fill course formed, in institute
State and waterproof bed course is filled on back fill course, wherein, the waterproof bed course top edge is concordant with the diaphram wall top edge；
Step S4, in the diaphram wall outside vertical several inlet wells are opened up, and fill sand thereto, wherein, it is described
Water guide bottom penetrates the yellow soil horizon of collapsibility into the non-yellow soil horizon of collapsibility, the upper end open of the inlet well and institute
State diaphram wall top edge concordant；
Step S5, fill water guide bed course on the waterproof bed course and the inlet well, and set in the water guide bed course with
The horizontal drain pipe that the inlet well is connected；
Step S6, on the water guide bed course fill the bed course that blocks water.
Preferably, in step S1 before the diaphram wall is set, use finite element software carry out sunykatuib analysis with
The safe distance between the diaphram wall and the ground periphery is calculated, and sets the underground to connect by this safe distance
Continuous wall.
Preferably, four corners are respectively perpendicular and open up a water guide on the outside of the diaphram wall in step S4
Well；Along the circle water of diaphram wall periphery laying one in the water guide bed course above the inlet well in step S5
Flat raft water pipe, the horizontal drain pipe is connected with each inlet well around the corner.
Preferably, one is being set to enclose after diaphram wall along ground periphery in step S1, on the inside of the diaphram wall
Paste one layer of waterproof geotextiles.
Preferably, the waterproof bed course is filled using dirt is closely knit in step S3.
Preferably, the water guide bed course is filled using grit in step S5.
Preferably, using the bed course that blocked water described in the closely knit building of dirt in step S6.
The present invention has advantages below compared with prior art：
1st, the present invention considers "+draining of soaking+block water " three aspect to handle big thickness collapsible loess foundation, i.e., pre- immersion
Realize that self-weight collapsible is settled, set diaphram wall, waterproof bed course and the bed course that blocks water to realize and blocks water, set horizontal aqueduct and
Inlet well realizes draining, so, and the factor such as the rainfall in later stage and underground water can not produce shadow to the yellow soil horizon of collapsibility in ground
Ring, can effectively reduce the possibility that saturated yielding occurs again for yellow soil horizon of collapsibility, and then ensure the stability of whole ground.
2nd, based on above-mentioned advantage, the present invention further by the inside of diaphram wall add one layer of geotextiles come strengthen every
Water, improves water proof effect, and economic and practical is strong.
Brief description of the drawings
The embodiment to the present invention is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 is a kind of floor map provided in an embodiment of the present invention.
Fig. 2 is Fig. 1 underground structure schematic diagram.
In figure：1-subway station, 2-horizontal drain pipe, 3-diaphram wall, 4-inlet well, 5-collapsible loess
Layer, 6-non-yellow soil horizon of collapsibility, 7-DDC, 8-station layer, 9-station hall layer, 10-back fill course, 11-waterproof bed course,
12-water guide bed course, 13-block water bed course.
Embodiment
In a kind of processing method of the big thickness collapsible loess foundation in subway station of the embodiment of the present invention, floor map is such as
Shown in Fig. 1, the square surrounding of subway station 1 sets diaphram wall 3, and the periphery of diaphram wall 3 was wrapped by one week horizontal drain pipe 2
Enclose, horizontal drain pipe 2 imports the inlet well 4 of four corners；The processing method can include step in detail below：
Step S1, it is determined that after the scope of the ground of subway station 1, set one to enclose diaphram wall 3 along ground periphery.
Wherein, diaphram wall 3 is core wall and its bottom penetrates yellow soil horizon of collapsibility 5 and enters non-yellow soil horizon of collapsibility 6,
For the moisture on periphery to be kept off outside to ensure the yellow soil horizon of collapsibility 5 in the diaphram wall 3 not by the shadow of periphery moisture
Ring.In practical application, the process of construction of diaphram wall 3 can be：Along ground periphery axis, under the conditions of mud off, first
Excavate out after a long and narrow deep trouth, clear groove, steel reinforcement cage is hung in groove, then build up one with tremie method underwater concreting with tremie method
Individual unit groove section, is so carried out paragraph by paragraph, and continuous armored concrete wall together is built up in underground, is cut as a kind of have concurrently simultaneously
Water, antiseepage, load-bearing, the structure of dash.
In practical application, first basis《Code for investigation of geotechnical engineering》The saturated yielding for intending processing is found out in GB50021-2001 requirement
The geological condition and the thickness of yellow soil horizon of collapsibility 5 of property loessland foundation soil；Undisturbed is taken, is pressed《Earthwork test rule》JTG
E40-2007 requirement carries out room to the moisture content of each soil layer, density, specific gravity of soil partical, void ratio, coefficient of collapsibility and the compressed coefficient
Interior soil test；Simultaneously according to roadbed natural ground level and circuit design altitude grading roads surveying setting-out, subway is determined
Stand 1 peripheral red line, that is, determine ground scope.
In addition, before diaphram wall 3 is set, sunykatuib analysis need to be carried out using finite element software, underground company is calculated
Continuous wall 3 and ground periphery（I.e. peripheral red line）Between safe distance, and by this safe distance set diaphram wall 3.
Step S2, yellow soil horizon of collapsibility 5 is set using pre- immersion mode to carry out self-weight collapsible sedimentation, and it is steady in sedimentation and deformation
The epibasal tier soil body carries out consolidation process over the ground after fixed.
The step concrete operations may be referred to Wang Jizhong（CN 105970911A）The method of proposition, that is, first pass through vibration or
Hammering squeezes into small steel pipe casing in yellow soil horizon of collapsibility 5（Depth is slightly less than loess formation thickness）；Into casing, insertion is with more
The water filling device of individual nozzle, is extracted after casing to water filling in water filling device or pressure water injection, makes yellow soil horizon of collapsibility 5 in immersion
Self-weight collapsible sedimentation is carried out afterwards；Record is observed to the saturated yielding settling amount of foundation soil body, until foundation soil body Collapsing Deformation
It is stable；Using deep dynamic compaction inside pile hole, i.e. using DDC stakes 7, hypobasal's soil body carries out consolidation process over the ground；The depth of reinforcing is from non-
Yellow soil horizon of collapsibility 6 is arrived at the foundation ditch base absolute altitude of subway station 1.It is of course also possible to use other presoakings and method for strengthening,
The present invention not considered critical herein.
In above process, after the saturated yielding sedimentation of the bottom of foundation ditch soil body of subway station 1 reaches requirement, if in the soil body
Water content is higher, can accelerate the consolidation of the soil body by water filling device reversely to extracardiac pumping and shorten the duration.
Step S3, excavation of subway foundation pit, subway main body structure and accessory structure construct complete and back fill course 10 formed
Afterwards, waterproof bed course 11 is filled on back fill course 10.
Specifically, after Metro Excavation foundation ditch, it can build station layer 8 as shown in Figure 2 and station hall layer 9 is awaited a subway structure,
After the completion of subway agent structure and accessory structure construction, it is backfilling into and the level of diaphram wall 3, formation back fill course 10, reality
Last layer basement process layer would generally be done in the application of border on back fill course 10；Then it is close using dirt on basement process layer
One layer of waterproof bed course 11 is filled in fact, it is concordant with the top edge of diaphram wall 3 by tamping the top edge of rear defence water subfill 11.
Step S4, in the outside vertical of diaphram wall 3 several inlet wells 4 are opened up, and fill sand thereto.
Wherein, the bottom of inlet well 4 penetrates yellow soil horizon of collapsibility 5 into non-yellow soil horizon of collapsibility 6 so that moisture will not be to wet
Fall into property loess formation 5 and produce influence；The upper end open of inlet well 4 is concordant with the top edge of diaphram wall 3.
Step S5, on waterproof bed course 11 and inlet well 4 water guide bed course 12 filled using grit, and in water guide bed course 12
It is middle that the horizontal drain pipe 2 being connected with inlet well 4 is set.
Wherein, horizontal drain pipe 2 uses U-shaped or V-type pvc pipe, and is set at the middle part of each section of drainpipe of surrounding 2 along water guide
2% longitudinal slope in the direction of well 4, it is convenient that water is discharged into inlet well 4.
In practical application, it can be respectively perpendicular in four corners in the outside of diaphram wall 3 and open up an inlet well 4,
Horizontal drain pipe 2 is enclosed along the periphery of diaphram wall 3 laying one in the water guide bed course 12 of the top of inlet well 4, horizontal drain pipe 2 is being turned
It is mutually perpendicular to and connects with each inlet well 4 at angle；Wherein, horizontal drain pipe 2 is in same level with water guide bed course 12.
Step S6, blocked water bed course 13 using the closely knit building of dirt on water guide bed course 12.
During actual construction of subway, repaired the roads according to actual needs after step S6, build the operation such as greenbelt
.
Claims (7)
1. a kind of processing method of the big thickness collapsible loess foundation in subway station, this method comprises the following steps：
Step S1, it is determined that subway station（1）After the scope of ground, one is set to enclose diaphram wall along ground periphery（3）, its
In, the diaphram wall（3）For core wall and its bottom penetrates yellow soil horizon of collapsibility（5）Into non-yellow soil horizon of collapsibility（6）；
Step S2, the yellow soil horizon of collapsibility made using pre- immersion mode（5）Self-weight collapsible sedimentation is carried out, and in sedimentation and deformation
The epibasal tier soil body carries out consolidation process over the ground after stable；
Step S3, excavation of subway foundation pit, subway main body structure and accessory structure construct complete and back fill course（10）After formation,
In the back fill course（10）On fill waterproof bed course（11）, wherein, the waterproof bed course（11）Top edge connects with the underground
Continuous wall（3）Top edge is concordant；
Step S4, in the diaphram wall（3）Outside vertical opens up several inlet wells（4）, and sand is filled thereto, its
In, the inlet well（4）Bottom penetrates the yellow soil horizon of collapsibility（5）Into the non-yellow soil horizon of collapsibility（6）, the water guide
Well（4）Upper end open and the diaphram wall（3）Top edge is concordant；
Step S5, in the waterproof bed course（11）With the inlet well（4）On fill water guide bed course（12）, and in the water guide pad
Layer（12）Middle setting and the inlet well（4）The horizontal drain pipe being connected（2）；
Step S6, in the water guide bed course（12）On fill the bed course that blocks water（13）.
2. processing method as claimed in claim 1, it is characterised in that：The diaphram wall is being set in step S1（3）It
Before, use finite element software to carry out sunykatuib analysis to calculate the diaphram wall（3）With the peace between the ground periphery
Full distance, and the diaphram wall is set by this safe distance（3）.
3. processing method as claimed in claim 1, it is characterised in that：In the diaphram wall in step S4（3）Outside four
Individual corner, which is respectively perpendicular, opens up an inlet well（4）；In the inlet well in step S5（4）The water guide pad of top
Layer（12）It is middle along the diaphram wall（3）The circle horizontal drain pipe of periphery laying one（2）, the horizontal drain pipe（2）
Corner and each inlet well（4）It is connected.
4. processing method as claimed in claim 1, it is characterised in that：One is being set to enclose the land lower company along ground periphery in step S1
Continuous wall（3）Afterwards, in the diaphram wall（3）Paste one layer of waterproof geotextiles in inner side.
5. processing method as claimed in claim 1, it is characterised in that：In step S3 the collision mat is filled using dirt is closely knit
Layer（11）.
6. processing method as claimed in claim 1, it is characterised in that：The water guide bed course is filled using grit in step S5
（12）.
7. processing method as claimed in claim 1, it is characterised in that：Using the pad that blocked water described in the closely knit building of dirt in step S6
Layer（13）.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710351885.3A CN107090842A (en) | 2017-05-18 | 2017-05-18 | A kind of processing method of the big thickness collapsible loess foundation in subway station |
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| CN201710351885.3A CN107090842A (en) | 2017-05-18 | 2017-05-18 | A kind of processing method of the big thickness collapsible loess foundation in subway station |
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Cited By (5)
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| CN107761708A (en) * | 2017-09-18 | 2018-03-06 | 庆阳敦博科技发展有限公司 | The processing method that big thickness Collapsible Loess District Subway station groundwork is reinforced |
| CN108118684A (en) * | 2017-11-28 | 2018-06-05 | 浙江大学城市学院 | A kind of Tidal Flat Reclamation blowing-filling sludge burning into sand layer foundation reinforcing structure and construction method |
| CN110230310A (en) * | 2019-06-06 | 2019-09-13 | 上海斐晟企业管理有限公司 | A kind of method and discharge structure preventing and treating collapsible loess depression |
| CN110409494A (en) * | 2019-07-23 | 2019-11-05 | 中国十七冶集团有限公司 | A kind of region of FuShui piping lane backfill waterproofing protection method |
| CN113006039A (en) * | 2021-03-05 | 2021-06-22 | 中电建路桥集团有限公司 | Dynamic compaction reinforcing construction method for collapsible loess foundation |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107761708A (en) * | 2017-09-18 | 2018-03-06 | 庆阳敦博科技发展有限公司 | The processing method that big thickness Collapsible Loess District Subway station groundwork is reinforced |
| CN108118684A (en) * | 2017-11-28 | 2018-06-05 | 浙江大学城市学院 | A kind of Tidal Flat Reclamation blowing-filling sludge burning into sand layer foundation reinforcing structure and construction method |
| CN108118684B (en) * | 2017-11-28 | 2023-06-16 | 浙江大学城市学院 | Beach reclamation dredger fill silt sand inclusion layer foundation reinforcing structure and construction method |
| CN110230310A (en) * | 2019-06-06 | 2019-09-13 | 上海斐晟企业管理有限公司 | A kind of method and discharge structure preventing and treating collapsible loess depression |
| CN110409494A (en) * | 2019-07-23 | 2019-11-05 | 中国十七冶集团有限公司 | A kind of region of FuShui piping lane backfill waterproofing protection method |
| CN113006039A (en) * | 2021-03-05 | 2021-06-22 | 中电建路桥集团有限公司 | Dynamic compaction reinforcing construction method for collapsible loess foundation |
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