CN104711967A - Method for carrying out combined vacuum preloading treatment on soft foundation by gravel piles - Google Patents
Method for carrying out combined vacuum preloading treatment on soft foundation by gravel piles Download PDFInfo
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- CN104711967A CN104711967A CN201510144026.8A CN201510144026A CN104711967A CN 104711967 A CN104711967 A CN 104711967A CN 201510144026 A CN201510144026 A CN 201510144026A CN 104711967 A CN104711967 A CN 104711967A
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Abstract
The invention relates to a method for treating a soft foundation. The method comprises the following steps: (1) leveling a field, and laying a gravel cushion layer in a pretreatment area; (2) carrying out gravel pile construction; (3) laying a vacuumizing pipe network; (4) laying the gravel cushion layer to the designed elevation; (5) laying a sealing film with good elasticity on the leveled gravel cushion layer, digging a seal pit around a pre-reinforcement area, and burying the sealing film into the seal pit; (6) vacuumizing, and pumping water and gas. According to the method, a composite foundation is formed by adopting the gravel piles and a vacuum preloading method, so that the advantage of good water permeability of the gravel piles can be exerted to the utmost extent, and the drainage consolidation of the surrounding soil is accelerated; therefore, the construction period is effectively shortened, the bearing capacity and stability of the foundation are improved, the post-construction settlement is reduced, and the reinforcement depth reaches more than 30m.
Description
Technical field
The present invention relates to Treatment Methods of Soft Ground, be applicable to process the weak subgrade such as barged-in fill, mucky soil recently, belong to civil engineering work technical field.
Background technology
Often soft foundation can be run in the middle of construction work; due to the development of heavy construction, speedway, high-speed railway; requirement for bearing capacity of foundation soil and stability is more and more higher, and natural weak subgrade can not meet the designing requirement of nowadays speedway and railway far away.Method conventional at present has: change and fill out Sand-gravel-cushion Technioue, packing sedimentation by throwing stones method, preloading, dynamic compaction, broken stone pile method, chemical stabilization, Reinforced subgrade method.But these methods have respective shortcoming for soft ground treatment, main manifestations is that consolidation effect difference cost is high, long in time limit.Therefore, find a kind of consolidation effect good, the reinforcing duration is short, and the soft base processing method of relative inexpensiveness is very necessary.
Summary of the invention
In order to solve the problem that existing Treatment Methods of Soft Ground exposes, the present invention proposes a kind of new method of broken stone pile combined vacuum precompressed soft ground treatment.The technical solution adopted in the present invention is: a kind of method of broken stone pile combined vacuum precompressed soft ground treatment, is characterized in that, said method comprising the steps of: (1) smooth location, in pretreatment zone, lay hardcore bed; (2) the Macadam Pile Construction; (3) laying vacuumizes pipe network; (4) hardcore bed is laid to design elevation; (5) on the hardcore bed flattened, lay the good diaphragm seal of elasticity and dig sealing ditch in the surrounding in pre-reinforcement region, diaphragm seal being imbedded in sealing ditch; (6) start to vacuumize, draw water and bleed.
The beneficial effect that the present invention can reach is: the present invention accelerates the discharging consolidation of broken stone pile surrounding soil, makes the ground after processing have good bearing capacity and stability, reduces and execute settlement after construction, can obtain good consolidation effect.
Accompanying drawing explanation
The overall sectional drawing of Fig. 1.
Fig. 2 vacuum tube network arrangements figure.
Detailed description of the invention
A method for broken stone pile combined vacuum precompressed soft ground treatment, is characterized in that, said method comprising the steps of:
(1) smooth location, in pretreatment zone, laying hardcore bed: every preparation of construction work before smooth location, should be carried out, as removed all above and below ground obstruction in place, getting rid of surface pond, lay temporary road etc., then carry out filling out digging restoration in earth-rock construction according to designing requirement.Then in pretreatment zone, lay the thick fine stone bed course of 0.3m-0.4m, mainly in order to the Macadam Pile Construction provides condition, plant equipment normally can work in pre-reinforcement district.By pretreatment zone subregion, the simultaneously base process of each district operates.
(2) the Macadam Pile Construction: adopt vibration ballast pile machine to construct, between broken stone pile diameter 0.5m-1.2m, pile spacing 1m-2m, adopts quincuncial arrangement, and stake is long can be chosen by reinforcing needs.
(3) lay and vacuumize pipe network: on hardcore bed, lay vacuum-pumping tube, 62mm Water penetrative flexible pipe selected by vacuum tube, and all pipe outer walls all wrap up instead considers geotextiles.Before laying vacuum tube, first vacuum tube is placed near pre-burial place, by the ditching on fine stone of vacuum tube installation position, vacuum tube is put into joint threeway or four-way connection between ditch tube and tube, fix with galvanized wire.
(4) hardcore bed is laid to design elevation: covered by vacuum-pumping tube with fine stone bed course, and make macadam overall height reach about 0.5m-0.6m.
(5) lay the good diaphragm seal of elasticity and dig sealing ditch in the surrounding in pre-reinforcement region, diaphragm seal being imbedded in sealing ditch and lay diaphragm seal and dig sealing ditch in pre-reinforcement region surrounding: sealing ditch width 0.5m-1m, degree of depth 2m-4m, by diaphragm seal
Imbed in sealing ditch, and compacted fill.
(6) jet pump is used to carry out operation: uninterruptedly to vacuumize with multiple stage jet pump, until water outlet is difficult, then foundation bearing Force meansurement is carried out, if reach Design of Bearing Capacity standard, then vacuumize end-of-job, if do not reach requirement then to proceed to vacuumize work, until reach bearing capacity of foundation soil design standard.
Operating principle of the present invention is as follows:
(1) method of vacuum preloading is under the condition not applying external load, change the stress state of soil mass consolidation, an atm difference is produced in pre-reinforcement district and diaphragm seal and between surrounding soil, under atmospheric pressure, rely on effective transmission of vacuum, excess pore water pressure in the soil body dribbles and is converted into effective stress, and foundation soil just obtains consolidation.(2) very large lateral pressure can be produced to pile body surrounding soil in the process of construction broken stone pile, soil cracking behavior around pile body is significantly reduced, compactness and angle of internal friction increase, surrounding soil physical and mechanical property obtains very large improvement, bearing capacity of foundation soil is improved, and reduces settlement after construction.(3) because broken stone pile has good water permeability, drainage channel good in vacuum preloading process can be become, accelerate the pore water of discharging vacuum preloading stage and the generation of work after-stage, accelerate the discharging consolidation of the stabilization zone soil body, improve soil strength.
Compare with broken stone pile method with traditional vacuum method, vacuum method associating broken stone pile method has the advantages such as consolidation effect is good, raising bearing capacity amplitude large, effective reduction of erection time, be particularly suitable for coast deposit, lacustrine deposit, river shoal deposition or remain, and the soil of hydraulic reclamation, landfill recently.
Claims (1)
1. a method for broken stone pile combined vacuum precompressed soft ground treatment, is characterized in that, said method comprising the steps of: (1) smooth location, in pretreatment zone, lay hardcore bed; (2) the Macadam Pile Construction; (3) laying vacuumizes pipe network; (4) hardcore bed is laid to design elevation; (5) on the hardcore bed flattened, lay the good diaphragm seal of elasticity and dig sealing ditch in the surrounding in pre-reinforcement region, diaphragm seal being imbedded in sealing ditch; (6) start to vacuumize, draw water and bleed until handled ground reaches design strength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510144026.8A CN104711967A (en) | 2015-03-30 | 2015-03-30 | Method for carrying out combined vacuum preloading treatment on soft foundation by gravel piles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510144026.8A CN104711967A (en) | 2015-03-30 | 2015-03-30 | Method for carrying out combined vacuum preloading treatment on soft foundation by gravel piles |
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| CN104711967A true CN104711967A (en) | 2015-06-17 |
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| CN201510144026.8A Pending CN104711967A (en) | 2015-03-30 | 2015-03-30 | Method for carrying out combined vacuum preloading treatment on soft foundation by gravel piles |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105239555A (en) * | 2015-09-28 | 2016-01-13 | 华中科技大学 | Method for treating soft soil foundation through combination of bagged grouting gravel pile and vacuum preloading |
| CN105970967A (en) * | 2016-05-19 | 2016-09-28 | 辽宁工程技术大学 | Subway station foundation ditch treatment method for water-rich area |
| JP2018168562A (en) * | 2017-03-29 | 2018-11-01 | 国立大学法人三重大学 | Method of constructing crushed stone structure and crushed stone structure |
| CN111501456A (en) * | 2020-04-29 | 2020-08-07 | 山东交通学院 | Reinforcing treatment method for soft foundation of newly-built highway engineering |
| CN111733791A (en) * | 2020-07-30 | 2020-10-02 | 四川港航建设工程有限公司 | Air-extracting sleeve gravel pile composite foundation and construction method thereof |
| CN112030934A (en) * | 2020-08-26 | 2020-12-04 | 中交第四航务工程局有限公司 | Anti-liquefaction treatment method for liquefiable foundation |
| CN112227344A (en) * | 2020-10-11 | 2021-01-15 | 福建新华夏建工有限公司 | Soft foundation reinforcement construction method with good reinforcement effect |
| CN113293664A (en) * | 2021-05-21 | 2021-08-24 | 湖南中耀交通工程有限公司 | Large-area weak roadbed reinforcing structure |
| CN114737554A (en) * | 2022-03-30 | 2022-07-12 | 中建路桥集团有限公司 | Construction method for treating soft foundation at bridge head by using gravel compaction pile |
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| KR100679601B1 (en) * | 2005-12-16 | 2007-02-06 | 김수삼 | Method of suction drain for water drainage in soft ground |
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| CN204059124U (en) * | 2014-08-06 | 2014-12-31 | 冠鲁建设股份有限公司 | A kind of sand drain strong rammer grouting behind shaft or drift lining foundation reinforcing structure |
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2015
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| JP2000144706A (en) * | 1998-11-06 | 2000-05-26 | Maruyama Kogyo Kk | Soft ground stabilization |
| KR100679601B1 (en) * | 2005-12-16 | 2007-02-06 | 김수삼 | Method of suction drain for water drainage in soft ground |
| CN101265701A (en) * | 2007-03-16 | 2008-09-17 | 张伯谦 | Soft soil foundation reinforcing means |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105239555A (en) * | 2015-09-28 | 2016-01-13 | 华中科技大学 | Method for treating soft soil foundation through combination of bagged grouting gravel pile and vacuum preloading |
| CN105970967A (en) * | 2016-05-19 | 2016-09-28 | 辽宁工程技术大学 | Subway station foundation ditch treatment method for water-rich area |
| JP2018168562A (en) * | 2017-03-29 | 2018-11-01 | 国立大学法人三重大学 | Method of constructing crushed stone structure and crushed stone structure |
| CN111501456A (en) * | 2020-04-29 | 2020-08-07 | 山东交通学院 | Reinforcing treatment method for soft foundation of newly-built highway engineering |
| CN111733791A (en) * | 2020-07-30 | 2020-10-02 | 四川港航建设工程有限公司 | Air-extracting sleeve gravel pile composite foundation and construction method thereof |
| CN112030934A (en) * | 2020-08-26 | 2020-12-04 | 中交第四航务工程局有限公司 | Anti-liquefaction treatment method for liquefiable foundation |
| CN112030934B (en) * | 2020-08-26 | 2021-12-03 | 中交第四航务工程局有限公司 | Anti-liquefaction treatment method for liquefiable foundation |
| CN112227344A (en) * | 2020-10-11 | 2021-01-15 | 福建新华夏建工有限公司 | Soft foundation reinforcement construction method with good reinforcement effect |
| CN113293664A (en) * | 2021-05-21 | 2021-08-24 | 湖南中耀交通工程有限公司 | Large-area weak roadbed reinforcing structure |
| CN114737554A (en) * | 2022-03-30 | 2022-07-12 | 中建路桥集团有限公司 | Construction method for treating soft foundation at bridge head by using gravel compaction pile |
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Application publication date: 20150617 |