CN107268365A - A kind of Construction of Soft Soil Subgrade technique - Google Patents

A kind of Construction of Soft Soil Subgrade technique Download PDF

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Publication number
CN107268365A
CN107268365A CN201710485093.5A CN201710485093A CN107268365A CN 107268365 A CN107268365 A CN 107268365A CN 201710485093 A CN201710485093 A CN 201710485093A CN 107268365 A CN107268365 A CN 107268365A
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CN
China
Prior art keywords
construction
soft
soft soil
throwing
change
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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.)
Pending
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CN201710485093.5A
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Chinese (zh)
Inventor
陈纪江
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Yunnan Xin Tong Construction Group Co Ltd
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Yunnan Xin Tong Construction Group Co Ltd
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Publication date
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Priority to CN201710485093.5A priority Critical patent/CN107268365A/en
Publication of CN107268365A publication Critical patent/CN107268365A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C3/00Foundations for pavings
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C3/00Foundations for pavings
    • E01C3/04Foundations produced by soil stabilisation
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02Improving by compacting
    • E02D3/10Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains

Abstract

The invention discloses a kind of Construction of Soft Soil Subgrade technique, using middle weathered sandstone backfill thickness 0.6 0.8m below 2m the and 100mm particle diameters of 300mm particle diameter above slabstone throwings thickness 1.5, to reach the stable overall structure of foundation bearing capacity, without using stone mar or retaining wall, the inventive method efficiency of construction is high, saves manpower and materials.

Description

A kind of Construction of Soft Soil Subgrade technique
Technical field
The present invention relates to a kind of soft soil roadbed technical field of construction, more particularly to a kind of Construction of Soft Soil Subgrade technique.
Background technology
Roadbed is the important component of highway, is the banded structure according to route allocation and the build of certain technical requirements Thing, bears the load transmitted by road surface, should there is enough intensity, stability and durability.Its stabilized soil pavement is by water, temperature The objective factors such as degree, soil property influence, while also by human factors such as roadbed design, construction method and maintenance process correctness Influence.It is actual herein in conjunction with engineering, the issuable ill-effect of Construction of Soft Soil Subgrade during subgrade construction is analyzed, is introduced Corresponding working measure, and Construction of Soft Soil Subgrade main method etc..
Soft soil roadbed is an emphasis in highway construction construction, and treatment of soft foundation turns into a technology difficulty of highway construction Point, is the pith of Engineering Quality Control, is frequently encountered in highway engineering soft soil roadbed.So-called weak soil, is generally referred to Cohesive soil under soft modeling or liquid-plastic state, is characterized in that natural moisture content is big, void ratio is big, the compressed coefficient is high, intensity It is low, and with special engineering geological properties such as creep properties, thixotropy, engineering geological condition is poor.Built on soft soil foundation Roadbed, if untreated or deal with improperly, often occurs destabilization of roadbed or excessive depression, causes highway damage or can not be normal Use.Mud, muck soil, soft clay are often traditionally collectively referred to as weak soil.Its key property show as natural moisture content it is high, Void ratio is big.Water content is between 34%~72%, and void ratio is between 1.0~1.9, and saturation degree is generally higher than 95%, and liquid limit is general For 35%~60%, plasticity index is 13~30.
Road is built in soft clay area, often occurs the problems such as road settlement is deformed, has a strong impact on the use of road, and Therefore huge economic loss is caused, or even causes irreparable consequence.In recent years, with expanding economy, city size Constantly expand, current China is completed and the urban road built, the roadbed in many regions be it is soft soil roadbed, Soft Soil Layer compared with Thickness, distributed more widely, soft soil roadbed processing work turns into the emphasis that road construction is studied.Generally, it is soft soil roadbed to urban road Adverse effect it is not enough mainly due to soft soil roadbed shearing strength, it is difficult to the load action of road surface transmission is born, in load It is soft soil roadbed under effect to produce partly or wholly failure by shear, so as to produce road surface landslide, unstability, cause road structure layer Destruction.
The content of the invention
It is an object of the invention to for above-mentioned the deficiencies in the prior art, there is provided a kind of Construction of Soft Soil Subgrade work Skill, 0.6-0.8m is backfilled using middle weathered sandstone below 300mm particle diameter above slabstone throwings 1.5-2m thickness and 100mm particle diameters Thickness, to reach the stable overall structure of foundation bearing capacity, without using stone mar or retaining wall, the inventive method construction effect Rate is high, saves manpower and materials.
The present invention is achieved by the following technical programs:A kind of Construction of Soft Soil Subgrade technique of the present invention, step is as follows:
(1)Selection excavates dell in dry season and dry season, and guarantees to cut and cover, and does not form hole, the pool of ponding;
(2)Before soft base construction, remove soft base and change the trees filled out in region, turf, rubbish etc., it is artificial first exclusively to show water, so Occluded water in crisscross gutter drainage topsoil is dug afterwards, and consequent relief current direction carries out draining, and ensures that draining is unobstructed;
(3)Throwing is carried out from dysgeogenous slabstone, the slabstone particle diameter of throwing should be greater than 30Omm, less than 30Omm particle diameters Content must not exceed 20%, throwing thickness 1.5-2m;
(4)Weathered sandstone carries out bed course backfill, rolled from, and laying depth is 0.6m-0.8m, and level is free of with requiring good The impurity such as plant residue, rubbish, the maximum particle diameter of middle weathered sandstone is not more than 10Omm, and clay content is not more than 5%, and compactness is big In 93%;
Preferably, when soft base is constructed, the whole insertions of builder's road in red line can meet dumper and pass through, in addition, soft Base, which is changed, to be filled out outside regional extent, is changed by soft base and is filled out edge ground preferably horizontal route direction, builds builder's road red to both sides road Line position, on sidewalk with loading machine and excavator it is smooth go out the bin stock platform of wide 10 meters, slabstone bin stock when being filled out for changing.
Preferably, change and fill out the line setting in region and use coordinate method, make to change by coordinate setting using total powerstation and fill out Duan Luji center line, embankment area leg wire of slope, then fills out region mileage scope by changing of being determined in design drawing, spy is dug out in surrounding Hole, ask owner's representative, survey, management and design liaison to live, according to the on-site actual situations of filling out digging are changed, determine Huan Tian areas The scope in domain and changing is filled out, packing sedimentation by throwing stones depth, is changed and is filled out after scope determines, yard of material, sidewalk are laid further according to on-site actual situations With the sequence of construction of packing sedimentation by throwing stones.
Preferably, step(2)In, plastic plate of the press-in with duct carries out assisted drainage in gutter, drain bar Hole is backfilled using sand.
Brief description of the drawings
Fig. 1 is construction flow chart of the invention.
Embodiment
Below in conjunction with the accompanying drawings 1 and specific embodiment the invention will be further described.
First, preparation of construction
1st, construction survey setting-out:Detailed field investigation should be carried out before construction, is verified flabbily according to report of engineering geological exploration Distribution, buried depth and the earth's surface of base, underground aqueous condition, it is enforceable according to design drawing, hydrogeologic data establishment Special scheme.
2nd, dell is excavated:Preferably select, in dry season and dry season progress, to should be noted that weather forecast during construction, and as far as possible with Cut and fill, does not form hole, the pool of ponding.
3rd, mud, weak soil are excavated:Before soft base construction, soft base should be removed and change the trees filled out in region, turf, rubbish etc., and Transport specified stockyard.It is artificial first exclusively to show water, occluded water in crisscross gutter drainage topsoil is then dug, it is suitable Landform current direction carries out draining, and ensures that draining is unobstructed.
4th, slabstone prepares:From slabstone, the slabstone particle diameter of throwing should be greater than 30Omm, less than 30Omm particle size contents not Must be more than 20%.Packing sedimentation by throwing stones and throwing slabstone, throwing thickness 1.5-2m according to a conventional method.
Fill out course preparation:Change and fill out the middle weathered sandstone that bed course selects good water permeability, level is with requiring good, without plant The impurity such as residuum, rubbish, the maximum particle diameter of middle weathered sandstone is not more than 10Omm, and clay content is not more than 5%.Pad according to a conventional method Layer is backfilled, rolled, and laying depth is 0.6m-0.8m, and compactness should be greater than 93%, can be delivered for a check after detection is qualified.
5th, builder's road and material yard preparation:When soft base is constructed, the whole insertions of builder's road in red line can meet haul Car passes through.Filled out in addition, being changed in soft base outside regional extent, changed by soft base and fill out edge ground preferably horizontal route direction, build construction Sidewalk to both sides boundary lines of roads position, on sidewalk with loading machine and excavator it is smooth go out the bin stock platform of wide 10 meters, supply Change slabstone bin stock when filling out.
2nd, line setting
Scope is filled out it is determined that changing:Change and fill out the line setting in region and use coordinate method, make to change by coordinate setting using total powerstation and fill out Duan Luji center line, embankment area leg wire of slope, then fills out region mileage scope by changing of being determined in design drawing, spy is dug out in surrounding Hole, according to the on-site actual situations of filling out digging are changed, is filled out and packing sedimentation by throwing stones depth it is determined that changing the scope for filling out region and changing.Change and fill out scope It is determined that after, the sequence of construction of yard of material, sidewalk and packing sedimentation by throwing stones is laid further according to on-site actual situations.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention God is with principle, and any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.

Claims (4)

1. a kind of Construction of Soft Soil Subgrade technique, it is characterised in that construction procedure is as follows:
(1)Selection excavates dell in dry season or dry season, and guarantees to cut and cover, and does not form hole, the pool of ponding;
(2)Before soft base construction, remove soft base and change the trees filled out in region, turf, rubbish etc., it is artificial first exclusively to show water, so Occluded water in crisscross gutter drainage topsoil is dug afterwards, and consequent relief current direction carries out draining, and ensures that draining is unobstructed;
(3)Throwing is carried out from dysgeogenous slabstone, the slabstone particle diameter of throwing should be greater than 30Omm, less than 30Omm particle diameters Content must not exceed 20%, throwing thickness 1.5-2m;
(4)Weathered sandstone carries out bed course backfill, rolled from, and laying depth is 0.6m-0.8m, and level is free of with requiring good The impurity such as plant residue, rubbish, the maximum particle diameter of middle weathered sandstone is not more than 10Omm, and clay content is not more than 5%, and compactness is big In 93%.
2. Construction of Soft Soil Subgrade technique according to claim 1, it is characterised in that when soft base is constructed, applying in red line The whole insertion of work sidewalk, can meet dumper and pass through, be filled out in addition, being changed in soft base outside regional extent, changed by soft base and fill out edge ground Preferable horizontal route direction, builds builder's road to both sides boundary lines of roads position, flat with loading machine and excavator on sidewalk It is whole go out the bin stock platform of wide 10 meters, slabstone bin stock when being filled out for changing.
3. Construction of Soft Soil Subgrade technique according to claim 1, it is characterised in that change the line setting for filling out region using seat Mark method, is made by coordinate setting using total powerstation and changes the center line for filling out section roadbed, embankment area leg wire of slope, then by true in design drawing Region mileage scope is filled out in fixed changing, and test pit is dug out in surrounding, ask owner's representative, survey, management and design liaison to scene, according to Change the on-site actual situations for filling out digging, it is determined that change the scope for filling out region and changing fill out, packing sedimentation by throwing stones depth, change and fill out after scope determines, The sequence of construction of yard of material, sidewalk and packing sedimentation by throwing stones is laid further according to on-site actual situations.
4. Construction of Soft Soil Subgrade technique according to claim 1, it is characterised in that step(2)In, band is pressed into gutter The plastic plate for having duct carries out assisted drainage, and the hole of drain bar is backfilled using sand.
CN201710485093.5A 2017-06-23 2017-06-23 A kind of Construction of Soft Soil Subgrade technique Pending CN107268365A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108457277A (en) * 2018-03-01 2018-08-28 中国水利水电第十工程局有限公司 A kind of a wide range of deep & thick silt excavation construction method
CN110004934A (en) * 2019-04-11 2019-07-12 中国葛洲坝集团第一工程有限公司 Foundation excavation of silt excavation construction method
CN110761271A (en) * 2019-10-18 2020-02-07 中铁八局集团第六工程有限公司 Construction process for treating soft soil of roadbed by using riprap sludge squeezing method
CN111235988A (en) * 2020-01-19 2020-06-05 江西海鑫建设有限公司 Energy-saving foundation-changing construction method
CN112813756A (en) * 2019-11-18 2021-05-18 浙江金业建设有限公司 Roadbed based on municipal soft soil and construction method

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CN104088208A (en) * 2014-07-15 2014-10-08 济南市市政工程设计研究院(集团)有限责任公司 Wet and soft soil foundation treatment method
CN104894937A (en) * 2015-04-10 2015-09-09 成军 Construction method for mucky soft soil roadbase tubular pile
CN105804048A (en) * 2016-04-06 2016-07-27 浙江水利水电学院 Strengthening method for soft foundation drain boards
CN106284279A (en) * 2016-08-30 2017-01-04 天津港国际物流发展有限公司 Container Yard method for processing foundation
CN106320123A (en) * 2016-08-16 2017-01-11 桐城市永锦建筑工程有限公司 Construction method of soft soil roadbed

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CN102605697A (en) * 2012-02-14 2012-07-25 天津二十冶建设有限公司 Sand dredger filling construction method of soft soil foundation embankment
CN104088208A (en) * 2014-07-15 2014-10-08 济南市市政工程设计研究院(集团)有限责任公司 Wet and soft soil foundation treatment method
CN104894937A (en) * 2015-04-10 2015-09-09 成军 Construction method for mucky soft soil roadbase tubular pile
CN105804048A (en) * 2016-04-06 2016-07-27 浙江水利水电学院 Strengthening method for soft foundation drain boards
CN106320123A (en) * 2016-08-16 2017-01-11 桐城市永锦建筑工程有限公司 Construction method of soft soil roadbed
CN106284279A (en) * 2016-08-30 2017-01-04 天津港国际物流发展有限公司 Container Yard method for processing foundation

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108457277A (en) * 2018-03-01 2018-08-28 中国水利水电第十工程局有限公司 A kind of a wide range of deep & thick silt excavation construction method
CN110004934A (en) * 2019-04-11 2019-07-12 中国葛洲坝集团第一工程有限公司 Foundation excavation of silt excavation construction method
CN110004934B (en) * 2019-04-11 2019-12-13 中国葛洲坝集团第一工程有限公司 Excavation construction method for silt foundation pit
CN110761271A (en) * 2019-10-18 2020-02-07 中铁八局集团第六工程有限公司 Construction process for treating soft soil of roadbed by using riprap sludge squeezing method
CN112813756A (en) * 2019-11-18 2021-05-18 浙江金业建设有限公司 Roadbed based on municipal soft soil and construction method
CN111235988A (en) * 2020-01-19 2020-06-05 江西海鑫建设有限公司 Energy-saving foundation-changing construction method

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Application publication date: 20171020

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