CN103806437B - Double-layer vacuum preloading and hydraulic reclamation soft foundation processing method - Google Patents

Double-layer vacuum preloading and hydraulic reclamation soft foundation processing method Download PDF

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CN103806437B
CN103806437B CN201410092180.0A CN201410092180A CN103806437B CN 103806437 B CN103806437 B CN 103806437B CN 201410092180 A CN201410092180 A CN 201410092180A CN 103806437 B CN103806437 B CN 103806437B
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vacuum
layer
preloading
soil
double
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CN103806437A (en
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王军
蔡袁强
王鹏
�谷川�
符洪涛
林旭
丁光亚
胡秀青
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Wenzhou University
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Abstract

The invention relates to a processing technology for hydraulic reclamation to soft foundation, particularly relates to a double-layer vacuum preloading and hydraulic reclamation soft foundation processing method, and belongs to the field of geotechnical engineering. According to the method, double-layer soft soil treatment is used, so as to overcome the defects of insufficient treatment depth and submucosal vacuum degree degression with depth in a single vacuum preloading technology, the energy transmission efficiency of vacuum degree along depth is increased, and a sealed drainage system designed ensures that the loss of the submucosal vacuum degree is reduced, so that soft foundation processing depth is enabled to be increased greatly, vacuum preloading treatment way is performed on upper half shallow soft soil, meanwhile a vacuum and overload combined preloading treatment way is performed on lower half deep soft soil, so that the phenomenon of bad solidification effect of a deep layer caused by difficulty water drainage in a traditional way is avoided.

Description

Double-layer compound vacuum prepressing blowing filling soft soil foundation treatment method
Technical field
The present invention relates to coastal blowing filling soft soil foundation treatment technology, more particularly to a kind of double-layer compound vacuum preloading weak soil The method of basement process, belongs to Geotechnical Engineering field.
Background technology
With the continuous expansion of Process of Urbanization Construction scale, being skyrocketed through of foreign trade, China coast port city Enter an all-round developing new period, reclaim fields from the sea on a large scale, the engineering such as polder competitively develops, and becomes coastal opening Put a beautiful landscape line in city.The ground engineering of making of coastal area all faces a major issue, and that is, such area mostly is height Moisture content, the silt clay of high-compressibility, need a kind of efficiently, the technological means of energy-conservation and environmental protection to be processing, then from two From the 80s and 90s in tenth century, technique of soft soil foundation treatment just arises at the historic moment as a kind of new technology processing soft soil foundation, and Constantly develop and perfect in decades, just have various vacuum preloading treatment technology today;From single vacuum precompressed skill Art, to vacuum combined stack-load, vacuum combined strong rammer, low position vacuum preloading, depth layer combine vacuum preloading and vacuum combined electricity The effective engineering method of various synthesis such as ooze, the development course of technique of soft soil foundation treatment has witnessed China and reclaimed fields from the sea the great achievement of engineering And promoted it rapidly to develop.
Find through engineering practice, although conventional vacuum prestressing technology is a kind of more effective at present blowing filling soft soil foundation Treatment technology, but there is this larger limitation.For example, it is used coarse sand to provide drainage path and routine as sand bedding course The simple cluster of longitudinal water-permeable pipe connects drain bar etc., all can cause at the geomembrane soil body toward deep soil internal vacuum Loss is more serious, and inside soil body discharging consolidation effect is bad.And the saturated dredger soft soil ground for the process larger 15~20m of depth Base, traditional treatment method is difficult to look after deep soil, causes the firmly interior soft less effective phenomenon of table, such as in low position vacuum preloading The upper strata soil body be that discharging consolidation is completed by low level horizontal vacuum pipe, do not reach expected consolidation effect, extend simultaneously yet Reinforcing cycle.It is also desirable to lay sand in " reclaimed ground double-face vacuum precompressed construction technology is studied with consolidation effect " literary composition Bed course is used as the process of bottom soft soil foundation.Number of patent application is 200810153628 double-layer low-position vacuum preload consolidation dress Put and soft soil foundation reinforcing method " in vacuum pipe network strictly do not adopt encapsulation process, it is low to there is vacuum energy utilization ratio, Easily cause vacuum transmission to be obstructed.Patent publication No. is the side of the bidirectional vacuum prepressing blowing filling soft soil foundation of cn101235634a In method, upper strata soft soil foundation is carried out in vacuum pre-pressed joint reinforcing as preloading to lower floor's Soft Soil Layer, the connection between vacuum tube is all It is that fragility connects, joint easily causes brittle fracture, so that vacuum preloading interrupts.
Therefore the present invention proposes a kind of new double-layer compound vacuum pre-pressed soft soil foundation treatment technology, not only ensure that true under film The transmission of reciprocal of duty cycle, has saved original bed course sand, and using manifold and hand-type joint to longitudinal drainage and vacuum tube Carry out flexible sealing connection, reduce vacuum linear loss, upper strata weak soil is covered water as preloading combination deeper weak soil is carried out Vacuum preloading is processed has the effect same processing with shallow-layer, accelerates the consolidation of the soil body, shortens the construction period, meets engineering real The application on border needs.
Content of the invention
The present invention relates to a kind of double-layer compound vacuum prepressing ground foundation treatment method, the double-deck processing soft soil of the method utilization, gram Take conventional single vacuum prestressing technology and processed depth not and the defect successively decreased with depth of under-membrance vacuum degree, increased true Reciprocal of duty cycle is along the transmission efficiency of depth, and designs sealed drainage system and decrease the loss of under-membrance vacuum degree so that weak soil ground Base processes depth and greatly increases, and upper half shallow layer soft soil carries out vacuum preloading processing mode, and lower half deep layer weak soil carries out vacuum simultaneously With preloading joint preloading processing mode, compensate for deep layer due to the phenomenon of traditional approach draining difficulty consolidation effect difference.
To achieve these goals, double-layer compound processing means and sealed row are employed in the scheme that the present invention adopts Water system.
The technical solution of the present invention comprises the following steps:
(1) cofferdam and envelope wall are set around pretreatment place, with under-membrance vacuum degree during ensureing vacuum preloading not Can be from the loss of soil body side;
(2) banket absolute altitude one half value by design, in the internal saturated dredger soft soil in cofferdam, lay two-layer separation layer on soil body top layer: One layer of geotextiles of layer of geotextile;According to the lateral separation designed in insulation surface opening, set plastic draining board, will 30cm about long native table drain bar be connected with draining and vacuum tube using hand-type joint, finally in surface covering one to two-layer Hdpe geomembrane.
(3) starting the vavuum pump initial stage of carrying out first vacuumizes, and discharges because of air in the film that stays during construction, in case upper earthing Body, in deadweight lower compression geomembrane, stops vacuumizing when geomembrane is close to soil body top layer.
(4) continue in the internal saturated dredger soft soil in cofferdam to designed elevation, the arrangement and method for construction being previously mentioned in repeat step (2), Define the setting of drain bar of the double-deck soil body, the connection of pipeline and the laying of separation layer afterwards.
(5) by completed for upper and lower both sides main draining and vacuum pipe pass-out, it is connected on vavuum pump, by the water extracted out in soil Pour in cofferdam, the quantity of vavuum pump flexibly sets according to the area of disposal field, subsequently ensureing that covering geomembrane is lossless In the case of start vavuum pump the soil body reach design the degree of consolidation after, that is, terminate construct.
The present invention is to propose on the basis of improved to traditional vacuum precompressed treatment technology, has a significant advantage that (1) increases The big process depth of vacuum preloading, traditional processing method can only carry out shallow-layer process, the DeGrain of deep level of processing, meeting The firmly interior soft phenomenon of table occurs.And the double-layer compound vacuum preloading processing method being related in the present invention, shallow soil is passed System vacuumizes with reference to covering water process, and deep soil is then carried out cover water vacuum preloading preloading joint preloading simultaneously and carry out at ground Reason, it is to avoid conventional method mid-deep strata soil body treatment effect not good enough consequence.(2) can avoid passing using sealed drainage system In system technique, the use of bed course medium coarse sand, greatlys save resource, ensure that inside soil body vacuum transmission simultaneously.(3) this The sealed drainage system of bright use is to be connected horizontal plastic draining board by hand-type joint with longitudinal drainage and vacuum tube, and Mouth of pipe joint is wound around with plastic sheeting, to guarantee the sealing of pipeline.
Using double-layer compound vacuum preloading treatment technology for depth 15~20m saturated dredger soft soil process have with shallow-layer at The same effect of reason.Present invention is mainly applied to the hydraulic reclamation of the large-scale key construction project such as coastal port city, railway, airport is soft Native basement process, meets the actual requirement of engineering.
Brief description
Fig. 1 double-layer compound of the present invention vacuum prepressing ground foundation treatment method profile.
Fig. 2 double-layer compound of the present invention vacuum prepressing ground foundation treatment method top view.
Fig. 3 sealed pipe used in the present invention 2 joint.
Fig. 4 sealed drain bar used in the present invention and pipe joint.
Specific embodiment
In conjunction with accompanying drawing 1, the construction procedure of the double-layer compound vacuum preloading process blowing filling soft soil foundation of the present invention is:
(1) before weak soil hydraulic reclamation starts, build cofferdam 1 first around pending place, and set envelope wall 2, Guarantee in the work progress in later stage that air will not enter place it is ensured that under-membrance vacuum degree around the soil body.
(2) press the half of designed elevation value, carry out the work of weak soil 7 hydraulic reclamation inside cofferdam 1, be subsequently covered each by above Last layer geotextile and geotextiles 3 as separation layer, to protect drainage system to separate with the soil body;Set by drain bar horizontal spacing Evaluation, in the separation layer upper shed of laying, carry out plastic draining board 4 sets work.
(3) subsequently enter an important step of construction, 30cm about long native table plastic draining board and steel wire corrugation rows Water and vacuum tube 5 are connected, and using hand-type tube sheet joint, joint carries out air-tightness guarantee using encapsulant, and prevents crisp Property fracture.Then lay one to two-layer hdpe geomembrane 6 so that entirely constructing by actual conditions above the pipeline of laying Journey carries out under air-proof condition it is ensured that construction quality.
(4) treat lower half layer sewerage system and after the completion of sealing system builds, starting vavuum pump 8 initial stage of carrying out vacuumizes, row Except air in the film producing because of construction, in case the upper strata soil body is in Gravitative Loads lower compression geomembrane;After geomembrane is close to the soil body Vavuum pump can be stopped.
(5) continue in the internal saturated dredger soft soil in cofferdam to designed elevation, the construction step being previously mentioned in repeat step (2)~(3) Suddenly, the connection of double-layer compound weak soil drainage system and the work of sealing isolation layer laying are finally completed.
(6) by completed for upper and lower both sides main draining and vacuum pipe pass-out, it is connected on vavuum pump 8, subsequently ensureing to cover Lid geomembrane is lossless and under-membrance vacuum degree generally should be controlled to reach 80~100kpa, just can start vavuum pump and be taken out Vacuum, the water extracted out in soil is poured in cofferdam, and after the soil body reaches the design degree of consolidation, construction just completes.
Fig. 2 show the connected mode figure between the transverse drainage plate of the present invention and draining and vacuum tube, and both pass through to set The hand-type joint of meter is attached the sealing it is ensured that drainage system.
Fig. 3, Fig. 4 show nipple and plastic draining board and pipeline between the draining of the present invention and vacuum pipe Between hand-type joint, in addition jointing material guarantee air-tightness.
Protection scope of the present invention is not limited only to the description of the present embodiment.

Claims (4)

1. a kind of method of double-layer compound vacuum pre-press reinforcing blowing filling soft soil foundation it is characterised in that: upper half shallow layer soft soil is entered Row covers water vacuum preloading and processes, and lower half deep layer weak soil is carried out covering water vacuum and the process of preloading joint preloading, pending simultaneously Set cofferdam around place and add envelope wall in downside soil layer, then in the internal saturated dredger soft soil in cofferdam to the one of process absolute altitude Half, squeeze into drain bar thereon according to a conventional method, the drain bar exposing native table is attached with draining and vacuum pipe, cover Geotextile and geomembrane, complete building of vacuum prepressing system, then carry out blowing inside cofferdam on existing soil layer again Fill out weak soil, repeat above work, vavuum pump can be started after treating double-layer vacuum precompressed Pattern completion and carry out basement process;Wherein Cover water vacuum preloading to be processed as processing soft soil foundation using sealing direct-drawing type vacuum preloading, sealing direct-drawing type vacuum preloading adopts Horizontal direction drainage system by horizontal plastic draining board pass through " hand-type " joint and longitudinal drainage and vacuum tube flexible sealing phase Even form, described connection all can ensure air-tightness and prevent brittle fracture.
2. according to right 1 a kind of method of double-layer compound vacuum pre-press reinforcing blowing filling soft soil foundation it is characterised in that: 30cm The long horizontal plastic draining board in left and right is to be connected with longitudinal drainage and vacuum tube flexible sealing by a manifold, thus group Become a sealed drainage system.
3. according to right 2 a kind of method of double-layer compound vacuum pre-press reinforcing blowing filling soft soil foundation it is characterised in that: utilize Described sealed drainage system, forms sealing system in upper overburden soil work cloth and geomembrane, from without setting sand bedding course As drainage path.
4. according to right 1 a kind of method of double-layer compound vacuum pre-press reinforcing blowing filling soft soil foundation it is characterised in that: double-deck Compound vacuum prepressing blowing filling soft soil foundation treatment method, upper half shallow layer soft soil is processed using covering water vacuum preloading, takes out in the soil body The water going out pours in cofferdam and acts on upper half shallow layer soft soil as preloading combined vacuum precompressed;Lower half deep layer weak soil is true using covering water Empty and preloading joint preloading is processed, and upper half shallow layer soft soil serves not only as processing soil layer, and can combine as preloading soil layer Layer covers water and acts on lower half deep layer weak soil.
CN201410092180.0A 2014-03-10 2014-03-10 Double-layer vacuum preloading and hydraulic reclamation soft foundation processing method Active CN103806437B (en)

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CN104120710B (en) * 2014-06-13 2016-08-24 宁波高新区围海工程技术开发有限公司 A kind of highway on soft ground method of vacuum pre-pressed joint serous fluid of dredger fill
CN104120711B (en) * 2014-06-13 2016-06-29 宁波高新区围海工程技术开发有限公司 A kind of piling prepressing united vacuum precompressed soft foundation consolidation process structure and method
CN104264656B (en) * 2014-09-26 2016-11-30 福建省建研工程顾问有限公司 Vacuum preloading downward stabilization by drainage soft soil foundation method
CN105929132A (en) * 2016-04-19 2016-09-07 中山大学 Vacuum pre-loading combined electric process test apparatus and test method thereof
CN106836183B (en) * 2017-02-21 2019-01-15 浙江水利水电学院 A kind of Embankment Foundation soil layer plastic draining structure and its construction method
CN110485436B (en) * 2019-07-24 2021-03-05 浙江大学 Engineering slurry and slag soil interbedded backfill pit foundation structure and foundation reconstruction method

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