CN105421332A - Soft foundation superficial layer novel treating method for accelerating natural consolidation of soft soil - Google Patents
Soft foundation superficial layer novel treating method for accelerating natural consolidation of soft soil Download PDFInfo
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- CN105421332A CN105421332A CN201510858779.5A CN201510858779A CN105421332A CN 105421332 A CN105421332 A CN 105421332A CN 201510858779 A CN201510858779 A CN 201510858779A CN 105421332 A CN105421332 A CN 105421332A
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- layer
- water
- soft
- blowing
- filling sludge
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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
- 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
- E02D3/106—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains by forming sand drains containing only loose aggregates
Abstract
The invention relates to a soft foundation superficial layer novel treating method for accelerating natural consolidation of soft soil. The method comprises the following steps that firstly, a cofferdam or a sea wall is arranged; secondly, bagged coarse sand is arranged on an original mudflat surface at intervals to form a water seepage layer; thirdly, vertical drainage pipes are arranged; fourthly, hydraulic reclamation of sludge is carried out layer by layer; fifthly, a surface layer concentrated drainage channel is arranged; sixthly, a water suction pump and a water level measuring probe are arranged, and water is pumped and drained; seventhly, water is pumped and drained continuously; eighthly, water pumping is stopped when the surface layer of the soft soil cracks obviously, the physical strength is obviously increased and samples taken from the soft soil at different depths are qualified in quality inspection; and ninthly, after work is completed, it can be considered to continue to pump water discontinuously so as to maintain the design value of the strength of a foundation. By means of the method, the adverse working conditions that when the surface of a soft foundation subjected to hydraulic reclamation is drained and aired naturally, the reinforcing effect is poor, longitudinal distribution of the reinforcing effect is extremely nonuniform, and the reinforcing period is long are overcome; and in addition, compared with traditional vacuum preloading treatment, the construction process is simple, construction investment is small, and the method better adapts to the treatment project for reinforcing hydraulic reclamation soft foundations with high water content and low natural water levels.
Description
Technical field
The present invention relates to a kind of soft base shallow-layer New Method for Processing accelerating weak soil natural consolidation, mainly utilize bottom bagged sand collection draining thus the soft base shallow-layer process novel construction method of acceleration weak soil natural consolidation, belong to the technical field of building foundation construction.
Background technology
In recent years, along with coastal strand Park district economy construction investment paces are accelerated, land resources day is becoming tight, for ensureing the connecting of economic construction, large area becomes coastal area and solves one of effective way of land resources scarcity, due to the shortage of China coast sand resource, reclaim fields from the sea and general all adopt blowing-filling sludge to increase to process, due to the bad engineering characteristic of saturated dredger soft soil high-moisture, strong compressibilty, hypotonicity, ultralow bearing capacity, cannot ensure that follow-up soft capital construction establishes big machinery and personnel all to march into the arena.
Present stage, this type of soft base is often adopted to the shallow-layer New Method for Processing of vacuum preloading or natural drying.The method of natural drainage consolidation, top layer, hydraulic reclamation district airing draining 2 ~ 3 years, after the crust layer that top layer forms 0.1 ~ 0.3m, landfill pool slag or layer of sand form foundation construction.It is not good to there is consolidation effect in these class methods, and consolidation effect only maintains top layer 0.1 ~ 0.3m, and later stage settlement after construction is very big; Consolidation effect is longitudinally issued extremely uneven, and duricrust bottom soil strength increases limited; Reinforce numerous bad conditions such as long in time limit.Vacuum preloading New Method for Processing, at blowing-filling sludge top layer airing draining back card/back board in 1 ~ March, adapter, laying " two cloth two films " to carry out sealing vacuumizing continuously, there is the bad conditions such as construction labour intensity is large, construction requirement is high, building materials uses comparatively greatly, postorder termination of pumping weak soil strength maintenance difficulty in these class methods.
Summary of the invention
A kind of soft base shallow-layer New Method for Processing accelerating weak soil natural consolidation of the present invention, the packed coarse sand central drainage of main utilization bottom collection, permeable layer is formed bottom blowing-filling sludge, by vertical drain, permeable layer water body is pumped out simultaneously, accelerate weak soil natural consolidation, phase only need concentrate pump drainage seepage flow layer water body after treatment, keeps the low water line of seepage flow layer, to ensure that the operation of nature power of the downward seepage flow of weak soil body improves consolidation effect.This engineering method achieves the stepless action from bottom to up of reinforcing soft foundation active force in weak soil, the bad conditions such as uneven, " mud post " phenomenon, construction investment large, the complex process that avoid that vacuum preloading treatment effect distributes in longitudinal degree of depth, overcome that hydraulic reclamation soft base draining natural drying consolidation effect is not good simultaneously, consolidation effect longitudinally issue extremely uneven, reinforce the bad conditions such as long in time limit.
For achieving the above object, the present invention is achieved by the following technical solutions:
Accelerate a soft base shallow-layer New Method for Processing for weak soil natural consolidation, comprise the following steps:
(1), cofferdam body or sea wall is arranged at treatment region boundary line;
(2), before blowing-filling sludge, according to process duration and blowing-filling sludge thickness, arrange packed coarse sand in former painting interplanar distance, packed coarse sand is arranged in bottom blowing-filling sludge, make to form permeable layer bottom blowing-filling sludge;
(3), according to soft base drainage effect, at packed coarse sands layer pitch arrangement vertical drain, described packed coarse sand is around being arranged in vertical drain periphery, so that fixing vertical drain;
(4), according to design blowing-filling sludge thickness and hydraulic reclamation mouth position, even laminating blowing-filling sludge, and ensure that the draining of blowing-filling sludge top layer is unobstructed;
(5), treat that hydraulic reclamation height reaches design altitude, arrange top layer weak soil drainage channel, at cofferdam body and sea wall aperture arrangement drainage channel;
(6), at vertical drain arrange suction pump and level measuring probe, and start concentrated continuous water-pumping/draining;
(7), process the middle and later periods, according to vertical drain water level conditions, concentrate continuous water-pumping/draining;
(8), treat that processing soft soil reaches the design treatment time, obviously, intensity increases obviously the be full of cracks of weak soil top layer, and different depth soil body sampling quality inspection is up to standard, stops pumping.
(9) after completion, according to the requirement of place Foundation Design bearing capacity and settlement after construction, can consider that discontinuity continues to draw water, so that retentively rheobase design load.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, patent of the present invention is further described.
Fig. 1 is that the present invention utilizes bottom collection draining to accelerate the longitudinal schematic diagram of soft base shallow-layer process of weak soil natural consolidation.
Fig. 2 is that the present invention utilizes bottom collection draining to accelerate the soft base shallow-layer process floor map of weak soil natural consolidation.
Be labeled as in figure: packed coarse sand spacing, B-vertical drain spacing bottom A-blowing-filling sludge; 1-cofferdam body or sea wall; 2-vertical drain; 3-hydraulic reclamation table of altitude; Slightly packed bottom 4-blowing-filling sludge; 5-blowing-filling sludge; 6-original state soil layer one; 7-original state soil layer two; The former painting face of 8-; 9-process boundary line.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further illustrated, but protection scope of the present invention is not limited to this.
As illustrated in fig. 1 and 2, the present invention accelerates the soft base shallow-layer New Method for Processing of weak soil natural consolidation, comprises the following steps:
(1), by traditional vacuum precompressed handling process, cofferdam body or sea wall 1 is arranged at treatment region boundary line;
(2), before blowing-filling sludge 5, according to process duration and blowing-filling sludge 5 thickness, on former painting face 8, the packed coarse sand 4 of pitch arrangement, is arranged in packed coarse sand 4 bottom blowing-filling sludge 5, makes to form permeable layer bottom blowing-filling sludge 5;
(3), according to weak soil drainage effect, at packed coarse sand 4 pitch arrangement vertical drain 2, packed coarse sand 4 is around being arranged in vertical drain 2 periphery, so that fixing vertical drain 2;
(4), according to design blowing-filling sludge 5 thickness and hydraulic reclamation mouth position, even laminating blowing-filling sludge 5, and ensure that blowing-filling sludge 5 top layer draining is unobstructed;
(5), treat that hydraulic reclamation height reaches design altitude, arrange top layer soil body drainage channel, at cofferdam body or sea wall 1 aperture arrangement top layer drainage channel;
(6), at vertical drain 2 arrange suction pump and level measuring probe, and start water-pumping/draining in continuum;
(7), the middle and later periods is processed, according to vertical drain 2 water level conditions, water-pumping/draining in continuum;
(8), treat that the processing soft soil time reaches design time, obviously, weak soil physical strength increases obviously the be full of cracks of weak soil top layer, and different depth soil body sampling quality inspection is up to standard, can stop pumping.
(9) after completion, according to the requirement of place Foundation Design bearing capacity and settlement after construction, can consider that discontinuity continues to draw water, so that retentively rheobase design load.
Claims (5)
1. accelerate a soft base shallow-layer New Method for Processing for weak soil natural consolidation, it is characterized in that comprising the following steps:
(1), cofferdam body or sea wall is arranged at treatment region boundary line;
(2), before blowing-filling sludge, according to process duration and blowing-filling sludge thickness, arrange packed coarse sand in former painting interplanar distance, packed coarse sand is arranged in bottom blowing-filling sludge, make to form permeable layer bottom blowing-filling sludge;
(3), according to soft base drainage effect, at packed coarse sands layer pitch arrangement vertical drain, described packed coarse sand is around being arranged in vertical drain periphery, so that fixing vertical drain;
(4), according to design blowing-filling sludge thickness and hydraulic reclamation mouth position, even laminating blowing-filling sludge, and ensure that the draining of blowing-filling sludge top layer is unobstructed;
(5), treat that hydraulic reclamation height reaches design altitude, arrange top layer weak soil drainage channel, at cofferdam body and sea wall aperture arrangement drainage channel;
(6), at vertical drain arrange suction pump and level measuring probe, and start concentrated continuous water-pumping/draining;
(7), process the middle and later periods, according to vertical drain water level conditions, concentrate continuous water-pumping/draining;
(8), treat that processing soft soil reaches the design treatment time, obviously, intensity increases outstanding the be full of cracks of weak soil top layer, and different depth soil body sampling quality inspection is up to standard, stops pumping;
(9) after completion, according to the requirement of place Foundation Design bearing capacity and settlement after construction, can consider that discontinuity continues to draw water, so that retentively rheobase design load.
2. accelerate the soft base shallow-layer New Method for Processing of weak soil natural consolidation as claimed in claim 1, it is characterized in that: the packed coarse sand width in described step (2) and thickness are arranged according to packed coarse sand spacing and blowing-filling sludge thickness.
3. accelerate the soft base shallow-layer New Method for Processing of weak soil natural consolidation as claimed in claim 2, it is characterized in that: the packed coarse sand width in described step (2) is 5 ~ 15m, thickness is 0.5 ~ 1.0m.
4. accelerate the soft base shallow-layer New Method for Processing of weak soil natural consolidation as claimed in claim 1, it is characterized in that: the packed coarse sand in described step (2) is for equidistantly arranging.
5. accelerate the soft base shallow-layer New Method for Processing of weak soil natural consolidation as claimed in claim 1, it is characterized in that: the vertical drain in described step (3) is for equidistantly arranging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510858779.5A CN105421332A (en) | 2015-12-01 | 2015-12-01 | Soft foundation superficial layer novel treating method for accelerating natural consolidation of soft soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510858779.5A CN105421332A (en) | 2015-12-01 | 2015-12-01 | Soft foundation superficial layer novel treating method for accelerating natural consolidation of soft soil |
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| CN105421332A true CN105421332A (en) | 2016-03-23 |
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| CN201510858779.5A Pending CN105421332A (en) | 2015-12-01 | 2015-12-01 | Soft foundation superficial layer novel treating method for accelerating natural consolidation of soft soil |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004052433A (en) * | 2002-07-23 | 2004-02-19 | Nippon Kaikou Kk | Soil improving method and device |
| CN201436323U (en) * | 2009-06-12 | 2010-04-07 | 广东省第一建筑工程有限公司 | Drainage structure of dynamic compaction foundation |
| CN102071675A (en) * | 2011-01-10 | 2011-05-25 | 广东省建筑科学研究院 | Soft soil foundation consolidation method combining drainage pile loading prepressing and deep mixing piles |
| CN103031836A (en) * | 2013-01-08 | 2013-04-10 | 中交四航工程研究院有限公司 | Method for quickly building road on new reclamation sludge foundation |
| CN103031837A (en) * | 2013-01-10 | 2013-04-10 | 中交四航工程研究院有限公司 | Method for reinforcing deep and soft soil foundation by combining well-points dewatering with preloading |
| CN103850244A (en) * | 2014-03-04 | 2014-06-11 | 中交四航工程研究院有限公司 | Method of stabilizing soft foundation through deep processing of bagged sand bed in freezing environment |
-
2015
- 2015-12-01 CN CN201510858779.5A patent/CN105421332A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004052433A (en) * | 2002-07-23 | 2004-02-19 | Nippon Kaikou Kk | Soil improving method and device |
| CN201436323U (en) * | 2009-06-12 | 2010-04-07 | 广东省第一建筑工程有限公司 | Drainage structure of dynamic compaction foundation |
| CN102071675A (en) * | 2011-01-10 | 2011-05-25 | 广东省建筑科学研究院 | Soft soil foundation consolidation method combining drainage pile loading prepressing and deep mixing piles |
| CN103031836A (en) * | 2013-01-08 | 2013-04-10 | 中交四航工程研究院有限公司 | Method for quickly building road on new reclamation sludge foundation |
| CN103031837A (en) * | 2013-01-10 | 2013-04-10 | 中交四航工程研究院有限公司 | Method for reinforcing deep and soft soil foundation by combining well-points dewatering with preloading |
| CN103850244A (en) * | 2014-03-04 | 2014-06-11 | 中交四航工程研究院有限公司 | Method of stabilizing soft foundation through deep processing of bagged sand bed in freezing environment |
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Application publication date: 20160323 |
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