CN107401158A - A kind of processing method for Coarse Saline ground - Google Patents
A kind of processing method for Coarse Saline ground Download PDFInfo
- Publication number
- CN107401158A CN107401158A CN201710313991.2A CN201710313991A CN107401158A CN 107401158 A CN107401158 A CN 107401158A CN 201710313991 A CN201710313991 A CN 201710313991A CN 107401158 A CN107401158 A CN 107401158A
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- Prior art keywords
- basement process
- processing method
- ground
- process material
- coarse
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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
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
- E02D3/126—Consolidating by placing solidifying or pore-filling substances in the soil and mixing by rotating blades
Abstract
The invention provides a kind of processing method for Coarse Saline ground, the processing method includes：The selection of basement process material；Improvement to the basement process material of selection；Several links such as foundation treatment technology.The local use of engineering ground Coarse Saline material can be realized using the Coarse Saline foundation treatment technology of the present invention, reaches the molten sunken property for substantially eliminating place, improves the efficiency of foundation bearing capacity；Meanwhile the foundation treatment technology, while place material local use is reached, greatly reduce because it is outer exchange filler and disposal field excavated material and caused by engineering cost；In addition, using the foundation treatment technology, the organic unity of economic benefit, social benefit and ecological benefits can be reached.
Description
【Technical field】
The invention belongs to brining ground foundation process field, is related to a kind of processing method for Coarse Saline ground.
【Background technology】
Coarse Saline is typically distributed on the area that dry, rainfall is rare, the temperature difference is big, sunshine is abundant.According to big
Engineering data is measured to understand, in these places because the salt-free water changed filler rareness, be pre-dissolved basement process is very limited,
Therefore the scheme filling out or to ground be pre-dissolved processing is changed using non-salty-soil according to code requirement, expense is very high, and
The outward transport processing of place excavated material and purchasing and transporting for outsourcing aggregate be present, so then cause civil engineering costs in whole engineering
The more non-Coarse Saline area of ratio in investment it is much bigger, while can also in transportation because dust is larger
The pollution of environment is caused, therefore, it is necessary to explore, study in this kind of arid and high salinity regional suitable basement process side
Method.
So far also without such foundation treatment technology for Coarse Saline area.
【The content of the invention】
It is an object of the invention to provide a kind of economically feasible, environmental benefit it is excellent be used for Coarse Saline ground
Processing method, it is costly to solve existing Coarse Saline area basement process, the problem of environmental benefit difference.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of processing method for Coarse Saline ground, comprise the following steps：
Step 1: the selection of basement process material；
Basement process material is not less than Coarse Saline from place foundation ditch and the flat excavated material in field is built, from material particle diameter
Gravelly sand particle diameter；
Step 2: the basement process material of selection is improved；
The basement process material of selection is blended, stirring changes the distributional pattern of lyotropic salt in former foundation soil, makes lyotropic salt equal
In the even foundation soil being distributed in after improveing；
Step 3: basement process；
Basement process material after improvement is divided into basement process part and based process part two parts；At ground
The coarse aggregate that the basement process material incorporation certain proportion particle diameter of part is 30mm~50mm is managed, then will mix coarse aggregate ground
The basement process material of the basement process material of process part backfill process part with based on is layered to roll backfill ground.
Further, in basement process, by measuring optimum moisture content ωooρ is determined with maximum dry densitydmaxControl pressure
Solidity.
Further, when the basement process material of basement process part rolls, rolling apparatus uses the pressure road not less than 12t
Machine, by carrying out flat stone roller and macroseism to the empty backfill layer for spreading 400mm, compacting factor is not less than 0.97.
Further, during basement process every layer handled after determine the natural density ρ of this layer0, natural moisture content ω and readily soluble
Salt content C, test specimen quantity are no less than 6；It is required that every layer of natural moisture content and optimum moisture content difference be 2% or so, compacting
Coefficient is not less than 0.97.
Further, the aeolian accumulation layer of sand for building place top layer is removed when being excavated to selected place basement process material.
Further, the aeolian sand for building place top layer about 500mm is removed when being excavated to selected place basement process material
Layer.
Further, before being improved to the basement process material of selection, cementing piece of the salt excavated in layer is rejected.
Further, it is 7 as the basement process material of basement process part and the ratio of coarse aggregate：3.
Further, the basement process material of basement process part backfills the ground of process part with based on during basement process
The backfill of base processing material, after the completion of rolling, the characteristic load bearing capacity and deformation modulus of processing groundwork soil are entered by load test
Row experiment measure.
The present invention is used for the processing method of Coarse Saline ground, and the principle based on place excavated material local use carries
The foundation treatment technology gone out, by changing the distributional pattern of lyotropic salt in original foundation soil, the molten of foundation soil can be substantially eliminated and fallen into
Property；By increasing the ratio of coarse granule content, while improveing foundation soil grading, the molten sunken property of foundation soil can be eliminated, improves ground
The load-carrying properties of base soil.Change the distributional pattern of lyotropic salt in foundation soil, improve the Grading feature of foundation soil, reach place material
The purpose of local use, result are to eliminate salinized soil disease, substantially reduce basement process expense, reach economic benefit and ecology
The harmony of benefit.
Foundation soil after processing eliminates the molten sunken and salt expandability of salinized soil, improves the load-carrying properties of foundation soil, can protect
Demonstrate,prove the safe operation of buildings or structures.
【Brief description of the drawings】
Fig. 1 is the implementing procedure figure of the present invention
Lyotropic salt distribution before and after Fig. 2 foundation improvements
Soluble salt content distribution map in Fig. 3 engineering ground foundation soils
The distributional pattern of lyotropic salt in Fig. 4 improvement groundwork soil
Fig. 5 engineering ground foundation soil ponding loading test distribution of results figures
【Embodiment】
It is right with reference to the accompanying drawings and detailed description to enable the features and advantages of the present invention more obvious understandable
The present invention is described in further detail.
As shown in figure 1, the present invention is used for the processing method of Coarse Saline ground, include the selection of basement process material；
Improvement to the basement process material of selection；3 links such as foundation treatment technology.3 parts are sequentially to carry out
, i.e., the place material first selected is excavated, and then place excavated material or place material are mixed by a certain percentage with coarse aggregate
Backfill material improved, finally carry out back the processing after filling weld rod.
Described basement process material is mainly comprised the following steps from part：
First, basement process material is preferentially from construction place foundation ditch and the flat excavated material in field, it is desirable to is not less than from material particle diameter
Gravelly sand rank.
The aeolian accumulation layer of sand that place top layer about 500mm need to be removed second, to selected place basement process material, during excavation is (more
For the very high aeolian sand of salt content).
Third, to the basement process material being excavated, cementing piece of the salt excavated in layer need to be rejected.
The improvement part of described basement process material is mainly to the lyotropic salt distributional pattern and ground in the ground base-material of selection
The improvement that base soil class is matched somebody with somebody.Its improved, process mainly comprises the following steps：
When to the processing material for basis backfill, desurfacing about 500mm aeolian accumulation layers of sand when directly can be excavated to place
Place material (Coarse Saline) improved.
According to the site condition of Coarse Saline, at least with excavators more than 210 types when place material excavates；
The Coarse Saline excavated out for place, artificial or mechanical agitation should be carried out, changed in original stratum easily
The distributional pattern of dissolved salt, it is set to be uniformly distributed in basement process material, as shown in Figure 2；
The Coarse Saline excavated out for place, after artificial or mechanical agitation, lyotropic salt survey should be carried out
It is fixed, it is desirable to which that the soluble salt content in stirring improvement groundwork soil is in that uniform state is distributed in foundation soil substantially.
The Coarse Saline excavated out for place, after artificial or mechanical agitation, with changing in original stratum
The uneven feature of layer lithology, optimizes the grain composition in basement process material, and can reduce the permeability of foundation soil.
Second, to the processing material backfilled for ground, expected (slightly with the place after desurfacing about 500mm aeolian accumulation layers of sand
Particle salinized soil) admixed with outsourcing aggregate (aggregate size should be 30mm~50mm) by certain than carrying out improved gradation.
The ratio of general place excavated material and outsourcing aggregate (aggregate size should be 30mm~50mm) should be by 7：3 are matched somebody with somebody
Than.When in the excavated material of place>When the granule content of 2mm particle diameters is relatively low, (aggregate size should be for place excavated material and outsourcing aggregate
30mm~50mm) ratio can be by 6：4 are matched；
, can be with manually or mechanically being stirred for place material and the basement process material improved according to a certain ratio of outsourcing aggregate
Mix, it is desirable to stir, be well mixed coarse aggregate and fine grained soil；
For place material and outsourcing aggregate by the processing material necessarily mixed than improvement, lyotropic salt in improvement material should be carried out
Measure, it is desirable to which it is in that uniform state is distributed in foundation soil substantially to improve the soluble salt content in groundwork soil.
For place excavated material and outsourcing aggregate by the processing material necessarily mixed than improvement, improvement material granular-grade should be carried out
The analysis matched somebody with somebody, it is desirable in improvement post processing material>The granule content of 2mm particle diameters is not less than 60%；
Described basement process part is mainly backfilled to the processing material after improvement, rolled, and eliminates original foundation soil
Molten sunken property and enhancing processing groundwork soil load-carrying properties.Its implementation process mainly has the following steps:
During excavation of foundation pit to substrate absolute altitude above 0.3m thickness, by manually carrying out the clear bottom of foundation ditch；
After excavation of foundation pit to substrate absolute altitude and acceptance(check), backfill processing should be carried out immediately；
Layered rolling is answered in the backfill of foundation ditch, and every layer of virtual resurfacing thickness general control is in 400mm, the water content ω of backfill
Control is in optimum moisture content ωop± 2% or so；
The layer position spread to void, the road roller not less than 12t should be selected to carry out rolling processing.First put down and grind one time, then shake
Dynamic (Gao Zhen) is rolled 4~6 times, and the amplitude of oscillation width of stone roller grinds wide for 2/3, and road roller travel speed is controlled in 2km/h or so；
After the completion of every layer is rolled, the density p of this layer is determined0, soluble salt content C, water content ω, the index such as grain composition,
And the test specimen of each test index is no less than 6；
According to foregoing surveyed index, the compacting factor of every layer of calculating, it is desirable to which the compacting factor of every layer of backfill is not less than
0.97；
The foundation soil handled by above-mentioned steps, carrying out plate loading test, (test method performs《Building lot base
Plinth design specification》The relevant regulations of (GB 50007-2011)), to determine the characteristic load bearing capacity of foundation soil and deformation modulus.
Illustrate the present invention program below by way of specific embodiment：
The present invention carries out inside in the refreshing fire 4 × 350MW power stations engineering in Xinjiang and tried out, by taking engineering foundation processing as an example,
Specific embodiment is briefly described below：
Xinjiang god's fire 4 × 350MW power stations engineering is located at Hui Autonomous Prefecture of Changji five colours gulf coal electricity coal chemical industry garden, field
Based on close in~closely knit dust of surface layer, soluble salt content is shown in Fig. 3 mostly between 0.3%~3.0%, is typical
Inland Coarse Saline, according to《Saline soil area Building technology specification》The requirement of (GB/T 50942-2014), such as table 1 simultaneously
According to live ponding loading test, foundation soil, which meets water, has molten sunken property, it is impossible to directly as supporting course, it is necessary to carry out soil removal and replacement pad
Layer or Pile Foundation processing, with the bearing capacity for eliminating the molten sunken property of foundation soil or improving ground, reach design requirement.
1. the selection of basement process material.Digging is opened flat from the place foundation ditch after desurfacing about 500mm aeolian accumulation layers of sand and field
Dust material changes the content in filler more than 2mm particle diameters and is not less than 60%, satisfaction, which is changed, fills out requirement, is specifically shown in Table 2 as filler is changed.
The foundation soil desalinization of soil by flooding or leaching of table 2 is front and rear to be more than 2mm sample gross mass result of variations
2. the improvement of basement process material.Basement process material is divided to two kinds, and one kind is to be used for foundation ditch, i.e. the backfill of building basis
Basement process material improvement；A kind of is the improvement for the basement process material of substrate backfill.Wherein it is used for substrate backfill ground
The improvement of processing is with 7 according to place dust excavated material and outsourcing aggregate (grain diameter is more than 30mm)：3 progress.The present invention
Outsourcing aggregate, it is necessary to pure, must not saliferous or mud.The process of improvement meets the requirement of improved, process of the present invention.
Lyotropic salt distributional pattern and other parameters after improvement are shown in Fig. 4 and table 3.
Table 3 improves front and rear foundation soil parameter comparison
3. basement process part.For the virtual resurfacing thickness of basement process, water content control, number of rolling, pressure stubble width,
Mechanical course speed and test content are carried out by application claims.Compacting factor is pressed not less than 0.97 control.
4. treatment effect and present situation.After being handled according to the present invention：(1) the molten sunken coefficient δ of foundation soil is 0.0075, remote small
In untreated preceding molten sunken coefficient (0.0215) value, processing groundwork soil does not have molten sunken property；(2) carrying of groundwork soil is handled
Power characteristic value brings up to 170kPa (being used for the backfill of building basis) by original 142kPa and 300kPa (returns for substrate
Fill out), reach treatment effect.
The engineering put into operation in 2013, the deformation for processing groundwork soil, had carried out monitoring tracking.Items monitoring
As a result show, the basement process carried out with the present invention, while meeting design requirement, greatly reduce basement process expense, have
The effect having an economic benefit with environmental benefit harmony.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to is recognized
The embodiment of the fixed present invention is only limitted to this, for general technical staff of the technical field of the invention, not
On the premise of departing from present inventive concept, some simple deduction or replace can also be made, should all be considered as belonging to institute of the present invention
The scope of patent protection that claims of submission determine.
Claims (9)
1. a kind of processing method for Coarse Saline ground, it is characterised in that comprise the following steps：
Step 1: the selection of basement process material；
Basement process material is not less than Coarse Saline gravelly sand level from place foundation ditch and the flat excavated material in field is built, from material particle diameter
Not；
Step 2: the basement process material of selection is improved；
The basement process material of selection is blended, stirring changes the distributional pattern of lyotropic salt in former foundation soil, lyotropic salt is uniformly divided
It is distributed in the foundation soil after improvement；
Step 3: basement process；
Basement process material after improvement is divided into basement process part and based process part two parts；As basement process part
Basement process material need to mix certain proportion particle diameter be 30mm~50mm coarse aggregate, then carry out layering stone roller by the technique of determination
Pressure processing；Based on backfill processing part place material improvement after directly by determine technique carry out layered rolling processing.
2. it is used for the processing method of Coarse Saline ground as claimed in claim 1, it is characterised in that：In basement process
When, by measuring optimum moisture content ωopρ is determined with maximum dry densitydmaxControl compactness.
3. it is used for the processing method of Coarse Saline ground as claimed in claim 2, it is characterised in that：In basement process portion
Rolling apparatus uses the road roller not less than 12t when the basement process material divided rolls, by the empty backfill layer progress for spreading 400mm
Flat stone roller and macroseism, compacting factor are not less than 0.97.
4. the processing method for Coarse Saline ground as described in claim any one of 1-3, it is characterised in that：Ground
During processing every layer handled after determine the natural density ρ of this layer0, natural moisture content ω and soluble salt content C, test specimen quantity it is many
In 6；It is required that every layer of natural moisture content and optimum moisture content difference, 2% or so, compacting factor is not less than 0.97.
5. the processing method for Coarse Saline ground as described in claim any one of 1-3, it is characterised in that：To choosing
Fixed place basement process material removes the aeolian accumulation layer of sand for building place top layer when excavating.
6. it is used for the processing method of Coarse Saline ground as claimed in claim 5, it is characterised in that：To selected place
The aeolian accumulation layer of sand for building place top layer about 500mm is removed when basement process material excavates.
7. the processing method for Coarse Saline ground as described in claim any one of 1-3, it is characterised in that：To choosing
Before basement process material is improved, cementing piece of the salt excavated in layer is rejected.
8. the processing method for Coarse Saline ground as described in claim any one of 1-3, it is characterised in that：As
The basement process material of basement process part and the ratio of coarse aggregate are 7：3.
9. the processing method for Coarse Saline ground as described in claim any one of 1-3, it is characterised in that：Ground
The basement process material of basement process part backfills the basement process material backfill of process part with based on, rolls completion during processing
Afterwards, the characteristic load bearing capacity and deformation modulus of processing groundwork soil are determined by load test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710313991.2A CN107401158A (en) | 2017-05-05 | 2017-05-05 | A kind of processing method for Coarse Saline ground |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710313991.2A CN107401158A (en) | 2017-05-05 | 2017-05-05 | A kind of processing method for Coarse Saline ground |
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| CN107401158A true CN107401158A (en) | 2017-11-28 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110158368A (en) * | 2019-05-17 | 2019-08-23 | 中铁二院工程集团有限责任公司 | 250~350km/h of speed per hour non-fragment orbit coarse grain salt marsh dirt road embankment structure and construction method |
| CN110158369A (en) * | 2019-05-17 | 2019-08-23 | 中铁二院工程集团有限责任公司 | 300~350km/h of speed per hour Ballast track coarse grain salt marsh dirt road embankment structure and construction method |
| CN110158370A (en) * | 2019-05-17 | 2019-08-23 | 中铁二院工程集团有限责任公司 | 200~250km/h of speed per hour Ballast track coarse grain salt marsh dirt road embankment structure and construction method |
| CN110967464A (en) * | 2018-09-28 | 2020-04-07 | 中铁二院工程集团有限责任公司 | Simple method for calculating settlement coefficient of coarse-grained saline soil |
-
2017
- 2017-05-05 CN CN201710313991.2A patent/CN107401158A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 刘志伟: "粗颗粒盐渍土回填碾压试验研究", 《工程勘察》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110967464A (en) * | 2018-09-28 | 2020-04-07 | 中铁二院工程集团有限责任公司 | Simple method for calculating settlement coefficient of coarse-grained saline soil |
| CN110967464B (en) * | 2018-09-28 | 2022-01-28 | 中铁二院工程集团有限责任公司 | Simple method for calculating settlement coefficient of coarse-grained saline soil |
| CN110158368A (en) * | 2019-05-17 | 2019-08-23 | 中铁二院工程集团有限责任公司 | 250~350km/h of speed per hour non-fragment orbit coarse grain salt marsh dirt road embankment structure and construction method |
| CN110158369A (en) * | 2019-05-17 | 2019-08-23 | 中铁二院工程集团有限责任公司 | 300~350km/h of speed per hour Ballast track coarse grain salt marsh dirt road embankment structure and construction method |
| CN110158370A (en) * | 2019-05-17 | 2019-08-23 | 中铁二院工程集团有限责任公司 | 200~250km/h of speed per hour Ballast track coarse grain salt marsh dirt road embankment structure and construction method |
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Application publication date: 20171128 |
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