CN108086348A - A kind of immersed tube tunnel combined foundation and setting method - Google Patents
A kind of immersed tube tunnel combined foundation and setting method Download PDFInfo
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- CN108086348A CN108086348A CN201810102135.7A CN201810102135A CN108086348A CN 108086348 A CN108086348 A CN 108086348A CN 201810102135 A CN201810102135 A CN 201810102135A CN 108086348 A CN108086348 A CN 108086348A
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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
- E02D27/52—Submerged foundations, i.e. submerged in open water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/063—Tunnels submerged into, or built in, open water
- E02D29/073—Tunnels or shuttering therefor assembled from sections individually sunk onto, or laid on, the water-bed, e.g. in a preformed trench
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Abstract
The present invention relates to immersed tube tunnel fields, are particularly a kind of immersed tube tunnel combined foundation, including：It is arranged on the PHC rigid pile composite foundations of immersed tube tunnel island epimere bottom；The subsoil set close to immersed tube tunnel mid-section bottom one end；First sand compaction pile ground；Ground is mixed, the mixing ground is by the second sand compaction pile ground and piling prepressing structure composition；The PHC rigid pile composite foundations are to being disposed with the mixing ground and the first sand compaction pile ground between the subsoil, the goal of the invention of the present invention is to provide a kind of foundation deformation for making immersed tube evenly, smoothly transit the compatibility of deformation of ground, ensure the immersed tube tunnel combined foundation of structure safety of immersed tube tunnel and the setting method of this immersed tube tunnel combined foundation.
Description
Technical field
The present invention relates to immersed tube tunnel fields, particularly a kind of immersed tube tunnel combined foundation and this immersed tube tunnel group
Close the setting method of ground.
Background technology
As immersed tube tunnel is applied more and more widely, the foundation soil situation run into also becomes increasingly complex, for deep
Soft soil foundation, it is obviously no longer suitable using displacement, and using pile foundation, it is on the one hand simultaneously uneconomical, on the other hand, at the top of pile foundation
Absolute altitude disunity and need the key technical problem that solves.
Therefore, in recent years, start to occur to carry out basement process to immersed tube tunnel by the way of combined foundation.
For relatively large immersed tube tunnel project, interlude, changeover portion and island epimere (ground native attached are broadly divided into
It is interlude to add part of the stress less than 0, and the part more than 0 is changeover portion), and island epimere is divided into secretly to bury section and open section,
Settlement of foundation below each section of immersed tube tunnel is different, and the different position settlement of foundation in same section is also different.
The sedimentation of interlude is smaller and than more uniform, and relative settlement is little, and changeover portion sedimentation is larger and sedimentation is uneven
Even, relative settlement is big.
It now there are no a kind of preferable combined foundation scheme for being used for immersed tube tunnel is found, can not become the ground of immersed tube
Shape evenly, smoothly transits the compatibility of deformation of ground, ensures the structure safety of immersed tube tunnel.
The content of the invention
In view of the problems of the existing technology, goal of the invention of the invention is to provide a kind of foundation deformation for making immersed tube
Evenly, smoothly transit the compatibility of deformation of ground, ensure the immersed tube tunnel combined foundation of the structure safety of immersed tube tunnel, with
And the setting method of this immersed tube tunnel combined foundation.
To achieve these goals, the technical solution adopted by the present invention is：
A kind of immersed tube tunnel combined foundation, which is characterized in that including：
It is arranged on the PHC rigid pile composite foundations of immersed tube tunnel island epimere bottom；
The subsoil set close to immersed tube tunnel mid-section bottom one end；
First sand compaction pile ground；
Ground is mixed, the mixing ground is by the second sand compaction pile ground and piling prepressing structure composition；
The PHC rigid pile composite foundations are squeezed to the mixing ground and first is disposed between the subsoil
Close sand pile ground.
In the epimere of island secretly bury section and open section is respectively positioned on man-made island, it is the support built on island secretly to bury segment structure, need
Stringent control settlement of foundation, effectively stable support is capable of providing using PHC rigid pile composite foundations, and below interlude
Originally it was Soft Soil Layer, Soft Soil Layer is all excavated or only stays relatively thin Soft Soil Layer after foundation trench excavates, and changes and fills out in progress jackstone
Afterwards, foundation settlement, foundation stiffness and foundation bearing capacity are satisfied by design requirement, and ground is not required to other specially treateds, directly use
Subsoil can (the soil layer intensity under at this be that do not have improved, simple processing has simply been carried out, so being still called
Subsoil), the transition of subsoil and PHC rigid pile composite foundations then passes sequentially through the first sand compaction pile ground, mixing
Ground sequence is set, and rigidity is increasing, and the foundation deformation of changeover portion that can make immersed tube evenly, assists the deformation of ground
Tune smoothly transits, and ensures the structure safety of immersed tube tunnel.
As the preferred embodiment of the present invention, high-pressure rotary-spray pile foundation is further included, the high-pressure rotary-spray pile foundation is arranged on
Between PHC rigid pile composite foundations and the mixing ground, further increase seamlessly transitting for foundation stiffness, make immersed tube tunnel
Structure it is safer.
As the preferred embodiment of the present invention, further include by the Deep Thick Soft Ground that is obtained after precipitation union charge preloading consolidation
Base, be located at immersed tube tunnel island epimere bottom, and positioned at the PHC rigid pile composite foundations with the high-pressure rotary jet grouting pile
The opposite one side of base, the foundation deformation for making immersed tube entirety evenly, linearly, make the deformation of ground more coordinate more to smoothly transit, into
One step ensures the structure safety of immersed tube tunnel.
As the preferred embodiment of the present invention, the first sand compaction pile ground is divided into multigroup, displacement by the difference of replacement rate
The first higher sand compaction pile ground of rate, closer to mixing ground, the foundation deformation for making immersed tube entirety evenly, linearly, makes ground
The deformation of base is more coordinated more to smoothly transit, and is further ensured that the structure safety of immersed tube tunnel.
As the preferred embodiment of the present invention, the second sand compaction pile ground is divided into multigroup, displacement by the difference of replacement rate
The second higher sand compaction pile ground of rate, closer to PHC rigid pile composite foundations, make the foundation deformation of immersed tube entirety evenly,
Linearly, the deformation of ground is made more to coordinate more to smoothly transit, is further ensured that the structure safety of immersed tube tunnel.
As the preferred embodiment of the present invention, the junction of different grounds is respectively positioned on the pipe joint section structure of immersed tube tunnel
Intermediate point, be happened at joint location to avoid the suddenly change of differential settlement, be achieved in longitudinal compatibility of deformation smooth-going
Transition overcomes the adverse effect of foundation treatment mode variation with bay structural rigidity.
As the preferred embodiment of the present invention, in the PHC rigid pile composite foundations, absolute altitude gradual change from high to low in stake bottom is leaned on
The nearly subsoil, stake bottom absolute altitude is lower, makes ground of the PHC rigid pile composite foundations on immersed tube length direction is met
Deformation evenly, linearly, can also make the absolute altitude at the top of pile foundation consistent, tube top absolute altitude can unanimously be such that pile foundation uniformly shares
Load of the portion from immersed tube tunnel ensures the safety and stability in tunnel, avoids single pile bearing excessive and occurs to destroy unstability.
Disclosed herein as well is a kind of immersed tube tunnel combined foundation setting method, including step：
In immersed tube tunnel island epimere bottom, PHC rigid pile composite foundations are set；
Subsoil is used in one end of immersed tube tunnel mid-section bottom；
Mixing ground is set gradually below immersed tube tunnel between the PHC rigid pile composite foundations and subsoil
With the first sand compaction pile ground, the mixing ground is by the second sand compaction pile ground and piling prepressing structure composition.
In the epimere of island secretly bury section and open section is respectively positioned on man-made island, it is the support built on island secretly to bury segment structure, need
Stringent control settlement of foundation, effectively stable support is capable of providing using PHC rigid pile composite foundations, and below interlude
Originally it was Soft Soil Layer, Soft Soil Layer is all excavated or only stays relatively thin Soft Soil Layer after foundation trench excavates, and changes and fills out in progress jackstone
Afterwards, foundation settlement, foundation stiffness and foundation bearing capacity are satisfied by design requirement, and ground is not required to other specially treateds, and it is natural
The transition of ground and PHC rigid pile composite foundations then passes sequentially through the first sand compaction pile ground, mixing ground sequence setting, just
Spend increasing, the foundation deformation of changeover portion that can make immersed tube evenly, smoothly transits the compatibility of deformation of ground, ensures
The structure safety of immersed tube tunnel.
As the preferred embodiment of the present invention, step is further included：PHC rigid pile composite foundations and it is described mixing ground it
Between high-pressure rotary-spray pile foundation is set, further increase foundation stiffness and seamlessly transit, the structure for making immersed tube tunnel is safer.
As the preferred embodiment of the present invention, step is further included：In immersed tube tunnel island epimere bottom, and it is firm positioned at the PHC
Property pile composite foundation the one side opposite with the high-pressure rotary-spray pile foundation deep soft soil foundation is set, by precipitation union heap
Ground preloading is carried to obtain, the foundation deformation for making immersed tube entirety evenly, linearly, makes the deformation of ground more coordinate more to smoothly transit,
It is further ensured that the structure safety of immersed tube tunnel.
The beneficial effects of the invention are as follows：
In the epimere of island secretly bury section and open section is respectively positioned on man-made island, it is the support built on island secretly to bury segment structure, need
Stringent control settlement of foundation, effectively stable support is capable of providing using PHC rigid pile composite foundations, and below interlude
Originally it was Soft Soil Layer, tunnel foundation trench, which excavates and backfill the subsoil that certain rubble is formed afterwards, makes foundation settlement, foundation stiffness
Design requirement is satisfied by with foundation bearing capacity, and the transition of subsoil and PHC rigid pile composite foundations, then pass sequentially through
One sand compaction pile ground, mixing ground sequence are set, and rigidity is increasing, can make the foundation deformation of changeover portion of immersed tube more
Uniformly, smoothly transit the compatibility of deformation of ground, ensure the structure safety of immersed tube tunnel.
Description of the drawings
Fig. 1 is the structure diagram of tunnel immersed tube in the present embodiment；
Fig. 2 is the first schematic diagram of the present embodiment Chinese and Western island；
Fig. 3 is the second schematic diagram of the present embodiment Chinese and Western island
Fig. 4 is the first schematic diagram of the present embodiment Middle East island
Fig. 5 is the second schematic diagram of the present embodiment Chinese and Western island
Specific embodiment
With reference to embodiment and specific embodiment, the present invention is described in further detail.But this should not be managed
The scope solved as the above-mentioned theme of the present invention is only limitted to following embodiment, the skill that all content of the invention based on the present invention are realized
Art all belongs to the scope of the present invention.
Embodiment 1
Western man-made island present embodiment discloses port Zhuhai and Macao project is to the immersed tube tunnel combined foundation of eastern man-made island, western people
Work island maximum settlement can reach 2m, and eastern man-made island changeover portion maximum settlement reaches 1m, and relative settlement is more than 50cm.Interlude
Sedimentation is then smaller, and total settlement is respectively less than 20cm, and the immersed tube tunnel combined foundation includes：
It is arranged on the PHC rigid pile composite foundations of immersed tube tunnel island epimere bottom；
Be arranged on immersed tube tunnel mid-section bottom subsoil (and close to interlude both ends at ground in, lean on
Western man-made island one end is connected with part subsoil, does not have then by eastern man-made island one end, following to talk about, so " close
" subsoil " in the subsoil that immersed tube tunnel mid-section bottom one end is set " the words can refer to positioned at interlude model
Interior subsoil is enclosed, can also refer to close to the western man-made island one end of direction of interlude but is not belonging in the range of interlude
Subsoil belongs to a part for western changeover portion, can talk about below), stake bottom absolute altitude in PHC rigid pile composite foundations by
High to Low gradual change, close to the subsoil, stake bottom absolute altitude is lower；
First sand compaction pile ground；
Ground is mixed, the mixing ground is by the second sand compaction pile ground and piling prepressing structure composition；
High-pressure rotary-spray pile foundation；
The deep soft soil foundation obtained after precipitation union charge preloading consolidation；
The PHC rigid pile composite foundations are to being disposed with the high-pressure rotary-spray pile foundation, mixed between the subsoil
Ground, the first sand compaction pile ground are closed, the deep soft soil foundation is located at immersed tube tunnel island epimere bottom, and positioned at the PHC
The one side opposite with the high-pressure rotary-spray pile foundation of rigid pile composite foundation, meanwhile, the junction of different grounds, equal position
In the intermediate point of the pipe joint section structure of immersed tube tunnel.
Specifically, the first sand compaction pile ground and the second sand compaction pile ground be divided by the difference of replacement rate it is multigroup,
The higher sand compaction pile ground of replacement rate, closer to PHC rigid pile composite foundations.
The present embodiment also discloses a kind of immersed tube tunnel combined foundation setting method, including step：
In immersed tube tunnel island epimere bottom, PHC rigid pile composite foundations are set；
In immersed tube tunnel mid-section bottom, subsoil is set, the stake bottom absolute altitude in PHC rigid pile composite foundations by height to
Low gradual change, close to the subsoil, stake bottom absolute altitude is lower；
High-pressure rotary-spray is set gradually below immersed tube tunnel between the PHC rigid pile composite foundations and subsoil
Pile foundation, mixing ground, the first sand compaction pile ground, the mixing ground is by the second sand compaction pile ground and piling prepressing
Structure composition, in immersed tube tunnel island epimere bottom, and positioned at the PHC rigid pile composite foundations and the high-pressure rotary jet grouting pile
The opposite one side of ground sets deep soft soil foundation, is obtained by precipitation union charge preloading consolidation, and setting described first is compacted
When sand pile ground and the second sand compaction pile ground, the first sand compaction pile ground and the second sand compaction pile ground press replacement rate
Difference be divided into multigroup, the first higher sand compaction pile ground of replacement rate, closer to mixing ground, replacement rate it is higher second
Sand compaction pile ground, closer to PHC rigid pile composite foundations.
Specific to port Zhuhai and Macao project western man-made island to the immersed tube tunnel combined foundation of eastern man-made island, this section of immersed tube tunnel
Road is divided into E1-E33 (such as Fig. 1), totally 33 immersed segments, and single immersed segment is divided into as several segments, specific immersed segment
Ground sets (while suitable for combinations of the above foundation structure and setting method) as follows：
(since western island epimere) open section：Including deep soft soil foundation and PHC rigid pile composite foundations, Deep Thick Soft Ground
Ground is obtained by precipitation union charge preloading consolidation, PHC rigid pile composite foundation stake spacing 3.0~5.0m, in rectangular layout,
Stake bottom absolute altitude is gradually transitions the PHC rigid pile composite foundations for secretly burying section in west from -34.0m to -28.0m；
Secretly bury section in west：PHC rigid pile composite foundations (are connected) with the PHC rigid pile composite foundations of open section, stake spacing
3.0~3.5m, in rectangular layout, stake bottom absolute altitude is from -35.0m to the gradual transition of -34.0m.
(being from here on western changeover portion) E1：Two segment (E1-S1~E1- that section connects secretly are buried with western man-made island
S2, S represent segment), using high-pressure rotary-spray pile foundation (such as Fig. 2, according to different replacement rates and different positions be divided into C1 and
Two regions of C2, and the parameter of high-pressure rotary-spray pile foundation such as table 1, the top in Fig. 2, there is mark from E1-E7, corresponding to be
The immersed tunnel structure of lower section, the dotted line that segment position is branched out with corresponding both ends are drawn, and are western man-made island on the right side of figure,
It turns left and is directed towards eastern man-made island, direction and diagram direction are anti-, and Fig. 3 below, 4 are similarly)；
Table 1
Pile of High-pressure Spiral Jet footpath 1.0m, stake spacing 1.5m and 1.7m, equilateral triangle arrangement, stake bottom absolute altitude about -34.5~-
36.0m, replacement rate are respectively 40.3% and 31.4%, 28 days average unconfined compressive strengths not less than 1.5MPa, E1-S1~
E1-S2 sections of High Pressure Jet Grouting Pile Composite Foundation east sides connect with the second sand compaction pile of 70% replacement rate, west side and PHC rigid piles
Composite foundation connects, and cohesive position stake sets similar width, and stake bottom absolute altitude is close,
Three segments next, using mixing ground, i.e., (by the second sand compaction pile ground and piling prepressing structure composition,
Piling prepressing structure filling is around the second sand compaction pile ground, and the second sand compaction pile ground is uniformly distributed in the form of an array, specifically
Be formed as first setting the second sand compaction pile ground, then form preloading around the second sand compaction pile ground with preloading
Prepressing structure).
E2~3：Mix ground；
E4：Two demisections (as show in Figure 2, each immersed tube tunnel is divided into as several segments) of close E3,
Using mixing ground, (described herein to be, the ground of the bottom of corresponding segment using certain ground, i.e., is the mixed of use here
Close ground)；Remaining 5 demisections use the first sand compaction pile ground；
E5：Close to a demisection of E4, using the first sand compaction pile ground；Remaining 6 demisections, are put using slightly lower
Change the first sand compaction pile ground of rate；
Specifically, E1-S3~E6-S2, segment length 750.50m, start-stop mileage is K11+789.25~K12+539.75.Its
Middle E1-S3~E4-S3 is using mixing ground, and such as Fig. 3 has marked region A1, A2, A3 and B1, (B1 B2 parts are not belonging to sink B2
Pipe tunnel foundation, does the structure safety and stability that basement process is not configured to immersed tube tunnel here, but in order to man-made island other
Structure is not sunk, and B1, B2 is further described here the integrality for being intended merely to embody embodiment scheme), A1, A2, A3 area are adopted
The mode combined with high replacement rate sand compaction pile and piling prepressing structure, two side areas B1, B2 area use draining sand drain and preloading
The mode of prepressing structure combination；E4-S3~E6~S1 uses the Ground Treatment Schemes of the sand compaction pile of high replacement rate, i.e. immersed tube
Tunnel basis intermediate region A4, A54 area uses the first sand compaction pile, design parameter such as table 2；
Table 2
E6-S1：Close to a demisection of E5, using the first sand compaction pile ground (here first of slightly lower replacement rate
Sand compaction pile ground is that replacement rate is minimum in all sand compaction pile grounds)；And other segments in this part, due to weak soil
Layer is excavated, directly using subsoil；
(interlude) E6-S2~E23 and E24~E30S2, Soft Soil Layer are all excavated or only stay relatively thin weak soil
Layer, tunnel basis generally within overconsolidated soil or sand on, after carrying out jackstone and changing and fill out, foundation settlement, foundation stiffness and ground
Base bearing capacity is satisfied by design requirement, and ground is not required to other specially treateds, directly using subsoil；
Wherein, for ease of accommodating mud and back-silting beneficial to surface is removed, shadow of the tube bottom silting to foundation settlement is eliminated
It rings, fill block stone throwing is set at tunnel foundation trench bottom and broken stone leveling interlayer and rams flat, tunnel E6-S2 to the general area of E30-S2 tube couplings
Duan Caiyong 2m chunk stone throwings are simultaneously rammed flat under water, and E6~E7 tube coupling part Soft Soil Layers are thicker and E6 tube couplings are handled with sand compaction pile
The section (K11+581.00~K11+789.25) of area's linking, which increases, rams plain block stone thickness to 3.5m, rams in plain block rock layers and uses
The band furrow blotter that jack up jackstone leveling ship is laid with 1.3m thickness forms natively base segment basis.Tunnel FS final spice position
In K7+509.000 to K7+511.000, to ensure construction in later period facility, FS final spice near zone is using block stone throwing and water
Lower ram is put down, and rams on flat bed and the band ridge blotter of 0.3m thickness is laid with using jack up jackstone leveling ship, bed course and bottom plate use
Grouting behind shaft or drift lining.
(being from here on eastern changeover portion) E30S3~S8：Using mixing ground；
E31：Using mixing ground, the second sand compaction pile replacement rate is equipped with excessive variation in segment point midway, such as E5
Ground is set；
E32：Using mixing ground；
E33：S1~S3 segments are mixing ground；
Specifically, such as Fig. 4, eastern island changeover portion includes E30-S4~E33-S3 tube coupling scopes, segment length about 480.5m, start-stop
Mileage is K6+972.25~K7+452.75.This section is all (pre- by the second sand compaction pile ground and preloading using mixing ground
Laminated structure forms).Immersed tube both sides set anti-collision structure basis, and draining sand drain is used to be formed after surcharge preloading.Specifically
, the first sand compaction pile and the second sand compaction pile are arranged in immersed tube bottom, and expand 5~7 row's sand compaction piles to both sides, and second
Draining sand drain is arranged in sand compaction pile both sides.Due to changing greatly for eastern island changeover portion load and geological conditions, in processing depth model
It is hit and is divided into upper and lower two layers with SPT blow count 10 in enclosing, upper and lower layer employs different-diameter (upper strata 1.5m, lower floor 1.1m)
Sand compaction pile, employing different arrangement forms in processing planar range, (load smaller area is 2.1 × 2.1m, middle transition
Region be 1.8 × 2.1m, load large area be 1.8 × 1.8m) sand compaction pile, share 6 kinds of replacement rates 40%/22%,
47%/25% and 55%/29%, it specifically see the table below, it is (upper and lower which includes A6 (upper and lower layer), A7 (upper and lower layer), A8
Layer), also having B3, B4 certainly, (B1, B2 part are not belonging to immersed tube tunnel ground, do basement process here and are not configured to immersed tube tunnel
Structure safety and stability, but do not sink for the other structures of man-made island, B3, B4 further described are intended merely to here
Embody the integrality of embodiment scheme), design parameter such as table 3；
Table 3
S4~S5 of (starting here as eastern island epimere) E33 is high-pressure rotary-spray pile foundation, followed by east is secretly buried section and opened wide
Section, east are secretly buried as PHC rigid pile composite foundations.Such as Fig. 5, Dong Dao islands epimere includes immersed tube E33-S4 to E33-S6 segments, according to
The different position of reinforcing area is divided into two regions of C3 and C4, design parameter such as table 4；
Table 4
The of immersed tube tunnel Dong Dao side E33-S4~E33-S5 section High Pressure Jet Grouting Pile Composite Foundations west sides and 55% replacement rate
Two sand compaction piles connect on (i.e. A8 upper stratas), and east side connects with PHC rigid pile composite foundations, and cohesive position stake sets width phase
Closely, island tunnel cast-in-place section and the open section of secretly burying in the stake bottom absolute altitude phase Near East is using PHC pipe pile composite foundations, west side and high-pressure rotary-spray
Pile composite foundation connects, and secretly buries section PHC pile composite foundations applied to CE1~CE6 segments, stake spacing 2.5~3.0m, rectangular
Arrangement, stake bottom absolute altitude is from -40.0m to the gradual transition of -36.0m；Open section is (compound including deep soft soil foundation and PHC rigid piles
Ground) PHC pile composite foundations are applied to OE1~OE4 segments, stake spacing 3.0~5.0m is in rectangular layout, stake bottom absolute altitude by-
For 36.0m to the gradual transition of -31.0m, what other were located at east side is then deep soft soil foundation.
Claims (10)
1. a kind of immersed tube tunnel combined foundation, which is characterized in that including：
It is arranged on the PHC rigid pile composite foundations of immersed tube tunnel island epimere bottom；
The subsoil set close to immersed tube tunnel mid-section bottom one end；
First sand compaction pile ground；
Ground is mixed, the mixing ground is by the second sand compaction pile ground and piling prepressing structure composition；
The PHC rigid pile composite foundations are to being disposed with the mixing ground and the first sand compaction pile between the subsoil
Ground.
2. immersed tube tunnel combined foundation according to claim 1, which is characterized in that further include high-pressure rotary-spray pile foundation, institute
High-pressure rotary-spray pile foundation is stated to be arranged between PHC rigid pile composite foundations and the mixing ground.
3. immersed tube tunnel combined foundation according to claim 2, which is characterized in that further include by precipitation union piling prepressing
The deep soft soil foundation obtained after reinforcing is located at immersed tube tunnel island epimere bottom, and positioned at the PHC rigid pile composite foundations
The one side opposite with the high-pressure rotary-spray pile foundation.
4. immersed tube tunnel combined foundation according to claim 1, which is characterized in that the first sand compaction pile ground is by putting
The difference for changing rate is divided into multigroup, the first higher sand compaction pile ground of replacement rate, closer to mixing ground.
5. immersed tube tunnel combined foundation according to claim 1, which is characterized in that the second sand compaction pile ground is by putting
The difference for changing rate is divided into multigroup, the second higher sand compaction pile ground of replacement rate, closer to PHC rigid pile composite foundations.
6. according to the immersed tube tunnel combined foundation described in claim 1-5 any one, which is characterized in that the friendship of different grounds
Place is met, is respectively positioned on the intermediate point of the pipe joint section structure of immersed tube tunnel.
7. according to the immersed tube tunnel combined foundation described in claim 1-5 any one, which is characterized in that the PHC rigid piles
In composite foundation, the gradual change from high to low of stake bottom absolute altitude, close to the subsoil, stake bottom absolute altitude is lower.
8. a kind of immersed tube tunnel combined foundation setting method, which is characterized in that including step：
In immersed tube tunnel island epimere bottom, PHC rigid pile composite foundations are set；
Subsoil is used in one end of immersed tube tunnel mid-section bottom；
Mixing ground and first is set gradually below immersed tube tunnel between the PHC rigid pile composite foundations and subsoil
Sand compaction pile ground, the mixing ground is by the second sand compaction pile ground and piling prepressing structure composition.
9. a kind of immersed tube tunnel combined foundation setting method according to claim 8, which is characterized in that further include step：
High-pressure rotary-spray pile foundation is set between PHC rigid pile composite foundations and the mixing ground.
10. a kind of immersed tube tunnel combined foundation setting method according to claim 9, which is characterized in that further include step：
In immersed tube tunnel island epimere bottom, and positioned at the opposite with the high-pressure rotary-spray pile foundation of the PHC rigid pile composite foundations
One side sets deep soft soil foundation, is obtained by precipitation union charge preloading consolidation.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113585346A (en) * | 2021-08-13 | 2021-11-02 | 中南大学 | Immersed tube foundation tank treatment process and immersed tube installation process for offshore inland river junction area |
| CN115162412A (en) * | 2022-08-24 | 2022-10-11 | 上海市城市建设设计研究总院（集团）有限公司 | Construction method of main span of long-distance multifunctional sea-crossing combined immersed tube tunnel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113585346A (en) * | 2021-08-13 | 2021-11-02 | 中南大学 | Immersed tube foundation tank treatment process and immersed tube installation process for offshore inland river junction area |
| CN115162412A (en) * | 2022-08-24 | 2022-10-11 | 上海市城市建设设计研究总院（集团）有限公司 | Construction method of main span of long-distance multifunctional sea-crossing combined immersed tube tunnel |
| CN115162412B (en) * | 2022-08-24 | 2023-07-04 | 上海市城市建设设计研究总院（集团）有限公司 | Construction method of long-distance multifunctional cross-sea combined immersed tunnel main span |
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