CN105369797A - Vacuum radiation solidification method for collapsible loess - Google Patents
Vacuum radiation solidification method for collapsible loess Download PDFInfo
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- CN105369797A CN105369797A CN201510769195.0A CN201510769195A CN105369797A CN 105369797 A CN105369797 A CN 105369797A CN 201510769195 A CN201510769195 A CN 201510769195A CN 105369797 A CN105369797 A CN 105369797A
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/02—Investigation of foundation soil in situ before construction work
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Abstract
The invention relates to a vacuum radiation solidification method for collapsible loess. The vacuum radiation solidification method for the collapsible loess comprises the following technological steps that firstly, a sealed loading layer is manufactured, a field with the collapsible loess is basically eliminated, a soil body on the surface layer is subjected to settlement and nonuniform settlement, and surface layer reinforcement treatment is conducted under the condition, so that the sealed loading layer is manufactured; secondly, self-loading and vacuum radiation are combined for solidification, a vacuum radiation pipe system is arranged on the basis of the sealed loading layer established on the surface layer, and forcible soil body compacting treatment is conducted on the high-humidity soft loess on an underlying stratum by means of a vacuum pump through the vacuum radiation pipe system; and thirdly, delivery and detection are conducted. According to the vacuum radiation solidification method for the collapsible loess, the construction steps are simple, the construction period is short, the cost is low, and the problems that after high-saturation soft losses construction is completed, a recovery period is long, the settlement is large, and the bearing capacity is low can be completely solved.
Description
Technical field
The present invention relates to a kind of collapsible loess vacuum radiation concretion method.Particularly relate to the rapidly solidified processing method of a kind of large area collapsible loess after water flood treatment.Be applicable to soak in advance the low place of height saturated soft loess foundation strength that dynamic compaction produces through presoaking or collapsible loess deep, possession base processing technology field.
Background technology
Along with progressively implementing of a band one road administration plan; the areas such as northwest, North China such as Xinjiang, Shaanxi, Gansu, Ningxia, Qinghai, the Inner Mongol often can run into collapsible loess foundation process problem; settlement by soaking Producing reason mainly due in loess forming process because local climate is dry; in soil, institute carbonate containing, calcium sulfate etc. are separated out formation cement and are jointly formed good viscosity with adhesion water, capillary water on the surface of soil; the macropore that soil is formed under deadweight and space can not get consolidation, are in deficient concretion state.After such soil is soaked in water, owing to destroying original connection between hydrone wedging particle and causing salt to dissolve, reduce shear strength, under deadweight or External Force Acting, soil skeleton destroys, and grogs falls into macropore or by jam-packed, causes saturated yielding.
The feature that namely water produce saturated yielding is met because collapsible loess has, therefore, the most frequently used to the process of collapsible loess be also most effective method is exactly " presoaking ", presoaking soaks to Site of Collapsible Loess large area in advance before architecture construction, make the soil body under saturated dead weight effect of stress, there is saturated yielding and produce densification, with the outer lotus settlement by soaking of the self-weight collapsible and deep soil layer of eliminating whole loess formation.Presoaking is generally applicable to the self weight collapse loess place that collapsible loess thickness is large, settlement by soaking is strong.
This reinforcement means due to place peripheral ground sinking cracking during immersion, and easily causes " metalling run out " Durchgangshohle, affects the safety of building, so the newly-built area of spaciousness is comparatively applicable.Simultaneously because presoaking takes water filling in the whole field, utilize the feature that loess vertical permeability coefficient is large, by the method for infiltration by the downward seepage flow of ground surface, solve settlement by soaking process slow, long in time limit and waste a large amount of water resources.
Because presoaking thoroughly can solve the settlement by soaking of loess, in work progress, long in time limit for presoaking, water resource waste defect, people have summed up deep layer water filling, top layer is aided with the method for strong rammer, i.e. " collapsible loess deep soak in advance dynamic compaction ", dynamic compaction is soaked in advance by needing to insert water injection pipe in reinforcing area in collapsible loess deep, water injection pipe reserves top layer 6 ~ 8m, at 6 ~ below 8m, spilled water hole is set, from the method for letting out, water flooding construction is carried out to collapsible loess by gravity flow, dynamic consolidation construction is carried out on the basis of Compaction variables, bottom can be reached and eliminate collapsibility of loess by water filling, top takes dynamic compaction method to reach closely knit reinforcing.
But in practice of construction process, because water filling adopts gravity flow from the method for letting out, therefore settlement by soaking is very easily caused to eliminate uneven, particularly in the middle of two water injection pipes, soil is difficult to Compaction variables, because the characteristic of collapsible loess is vertical permeability coefficient be greater than horizontal osmotic coefficient, the soil body between water injection pipe is caused to obtain water filling; And the water injection pipe periphery soil body is converted into high humility soft loess after water filling, Saturation ﹥ 80%, reaches liquefaction; That is, the method to top layer 6 ~ 8m collapsible loess by forced ramming reinforcing closely knit, the bottom soil body due to water-filling method improper, the complex foundation of low humidity collapsible loess and high humility soft loess can be produced.
Particularly loess is after immersion, and water content of soil is recovered to need certain hour, as adopted pile foundation, then soil around pile is by after water-soaked, and pile side resistance significantly reduces, and even disappears, when soil around pile produces self-collapsibility, the positive friction of stake side is converted into negative friction rapidly.Building lot after this process, still cannot meet the constructions such as follow-up pile foundation, need shelve and return to some strength to soft loess, can carry out subsequent construction.
In sum; To the consolidation process of collapsible loess particularly self weight collapse loess, generally including to eliminate or reduce Collapsing Deformation harm is main purpose, need the foundation treatment improving bearing capacity of foundation soil simultaneously, and high humility soft loess (especially Saturated loess soil, how be transformed by collapsible loess water of satisfying, Saturation ﹥ 80%) to improve bearing capacity of foundation soil, to reduce the foundation treatment that harmful compression is deformed into object.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency, there is provided a kind of construction sequence simple, short construction period, cost is low, solves that the Saturation ﹥ 80% high humility soft loess settlement amount after construction that " pre-water seaoning " or " collapsible loess deep soak in advance dynamic compaction " formed afterwards is large, the collapsible loess vacuum radiation concretion method of low bearing capacity defect.
The object of the present invention is achieved like this:
A kind of collapsible loess vacuum radiation concretion method, the method comprises following processing step:
Step one, making sealing loading layer
The place of basic elimination collapsibility of loess, the top layer soil body produces the phenomenon of sedimentation and sedimentation inequality, with this understanding, carries out top layer consolidation process and makes sealing loading layer;
Step 2, self-load combined vacuum radiation consolidation
The sealing loading layer that this step is set up by top layer, the basis of sealing loading layer arranges vacuum radiation guard system, adopts vacuum pump to force soil body compression process by vacuum radiation guard system to substratum high humility soft loess;
Step 3, payment detect
Complete after the construction of self-load combined vacuum radiation consolidation through above-mentioned steps, the every mechanics index of physics of high humility soft loess all can be largely increased, and can detect by designing requirement.
The detailed description of the invention of step 2 is:
2.1, vacuum radiation guard system mesh design: be generally arranged as 4m × 4m or 8m × 8m, actual arrangement grid is arranged according to geological conditions and designing requirement;
2.2, vacuum radiation pore boring: according to the soil condition that need process, after determining vacuum radiation guard system grid, hole according to vacuum radiation guard system grid;
2.3, vacuum radiation guard system is arranged:
Design radiating aperture apart from vacuum radiation pipe top 6m ~ below 8m, radiating aperture is arranged along the tube wall of vacuum radiation pipe body, until at the bottom of vacuum radiation pipe pipe, and vacuum radiation pipe pipe bottom seal, vacuum radiation pipe body outsourcing nylon leaching net;
Several vacuum radiation pipe top is connected by arm after inserting boring by vacuum radiation pipe, and several arm connects supervisor, and supervisor connects vacuum pump, opens vacuum pump;
2.4, self-load combined vacuum radiation consolidation process monitoring
Vacuum-degree monitoring: guarantee that vacuum is 60 ~ 80KPa;
Settlement monitoring: average settlement was less than 1mm/ days in continuous five days, illustrates down that the intensity of sleeping Saturated loess soil is recovered, can carry out levelling of the land;
2.5, carry out top layer after levelling of the land completely ram or roll.
Making sealing loading layer in step one adopts strong rammer compacting, impact-rolling or vibroroller cmpacting compacting, slip casting chemical consolidation sealing or seals at top layer overlay film.
Detection method in step 3 adopts dead load detection, static sounding detects or soil test sampling detects.
The monitoring of self-load combined vacuum radiation consolidation process is needing reinforcing area to arrange sedimentation mark, and sedimentation mark arranges grid to be 30m × 30m or to arrange, to observe the sedimentation on earth's surface in vacuum according to designing requirement encryption.
Compared with prior art, the invention has the beneficial effects as follows:
1, implement simply, the problem that quick solution high humility soft loess foundation strength is low
Vacuum radiation guard system grid is set up at high humility soft loess ground, utilize and the substratum soil body is vacuumized, the soil body is forced to compress, the top soil body forms gravity pressure, further compressive strain is carried out to the substratum soil body, improve the degree of compaction of the soil body and void ratio, for the quick recovery strength of saturated soft loess creates a brand-new method.
2, the engineering time is short, and speed is fast, and cost is low:
The present invention is owing to taking vacuum radiation guard system grid, utilization vacuumizes to be formed carries out negative pressure consolidation process to bottom height saturated clays, by inserting the vacuum radiation pipe of desired depth, the negative pressure of vacuum produced by vacuum pump applies negative pressure of vacuum by the radiating aperture of vacuum radiation pipe uniformly to soil body perisporium, to required thickness, required scope can solve the complex foundation of low humidity collapsible loess because deep layer water filling dynamic compaction is formed and high humility soft loess uniformly.
3, efficiency is high, and consolidation effect is obvious
Utilize the certain thickness of shallow-layer as sealant, utilize its selfweight stress to the substratum soil body from carrying force, vacuumize in conjunction with deep layer, high saturated soft loess is produced after not only solving water seaoning or deep layer water filling, also solve deep soil intensity not high, and high-energy dynamic compaction cannot reach the difficulty of desired depth.Place after process of the present invention, had both solved the harm of low humidity deformation of collapsible loess, had solved again that high humility soft loess, especially Saturated loess soil bearing capacity of foundation soil are low, the foundation treatment of compressive strain.
4, structure two kinds of methods, unique variation innovation
By setting up vacuum radiation guard system grid, changing the working method of its power source, changing into pressure water pump by vacuum pump, just can carry out radiant type pressure water flooding, to the region needing Compaction variables, carry out pressure water flooding; Can be reached through pressure water flooding and solve the settlement by soaking of collapsible loess, thus it is uneven to solve the water filling that " collapsible loess deep soak in advance dynamic compaction " produce, and forms the serious consequence of complex foundation soil; Construction for Canal in Loess Area provides a kind of basic method of solution collapsible loess completely newly, solves the trouble and worry that Canal in Loess Area is built.
Therefore the present invention has construction sequence simply, short construction period, and cost is low, and after thoroughly can solving high saturated soft loess work, convalescence is grown, settling amount is large, the problem of low bearing capacity.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is self-load combined vacuum radiation consolidation theory figure.
Fig. 3 is radiant type pressure water flooding schematic diagram.
Wherein:
Arm 1
Supervisor 2
Power source 3
Reserved soil layer 4
Radiating aperture 5
Vacuum radiation pipe body 6
At the bottom of vacuum radiation pipe pipe 7
Press water 8
Gravity water 9
Negative pressure of vacuum 10
Preloading soil pressure 11.
Detailed description of the invention
See Fig. 1 ~ Fig. 3, a kind of collapsible loess vacuum radiation concretion method that the present invention relates to, the method comprises following processing step:
Step one, making sealing loading layer
After " pre-water seaoning " or " collapsible loess deep soak in advance dynamic compaction ", substantially eliminate the place of collapsibility of loess, the top layer soil body produces the phenomenon of sedimentation and sedimentation inequality, with this understanding, is necessary that carrying out top layer consolidation process makes sealing loading layer.The present invention utilizes top layer to need this operation of smooth reinforcing, again processes lower sleeping high humility soft loess, is reached Quick height bearing capacity of foundation soil by process, is reduced the object of harmful compression distortion.
Make that sealing loading layer can adopt that strong rammer is tamped, impact-rolling or vibroroller cmpacting compacting, slip casting chemical consolidation sealing also can take in conventional methods such as top layer overlay film sealings.Its effect, except reaching levelling of the land compaction place, also can utilize in reserved soil layer 4 scope of top layer 1 ~ 3m thickness closely knit, seal loading layer, ensure the air impermeability of follow-up precompressed to be formed on practical significance.The sealing loading layer that this reserved soil layer 4 is formed, not only as sealant, also as from carrier layer, plays preloading compaction to the substratum soil body.
Step 2, self-load combined vacuum radiation consolidation
The sealing loading layer that this step is set up by top layer, the basis of sealing loading layer arranges vacuum radiation guard system, adopts vacuum pump to force soil body compression process by vacuum radiation guard system to substratum high humility soft loess.
2.1, vacuum radiation guard system mesh design: be generally arranged as 4m × 4m or 8m × 8m, actual arrangement grid is arranged according to geological conditions and designing requirement.
2.2, vacuum radiation pore boring: according to the soil condition that need process, after determining vacuum radiation guard system grid, trepan or board-plugging device can be adopted to hole according to vacuum radiation guard system grid, aperture is 50mm, and hole depth is determined (generally can reach below 30m) according to the thickness of high humility soft loess; When determining actual hole depth, under normal circumstances, the compressive strain effect of soil body selfweight stress to the substratum soil body must be considered, to reduce construction costs.
2.3, vacuum radiation guard system is arranged:
Vacuum radiation pipe adopts pvc pipe or nylon tube, apart from this 6m ~ 8m part of vacuum radiation pipe top 6m ~ 8m(for reserving soil layer) design radiating aperture 5 below, radiating aperture 5 diameter is 10mm, radiating aperture 5 spacing is 200mm, radiating aperture 5 is arranged along the tube wall of vacuum radiation pipe body 6, until at the bottom of vacuum radiation pipe pipe 7,7 shutoff at the bottom of vacuum radiation pipe pipe; Vacuum radiation pipe body 6 outsourcing 60 order ~ 80 order nylon leaching net 1 ~ 2 layer.
After vacuum radiation pipe inserts boring, adopt diameter be the pvc pipe of 600mm as arm 1, connected by arm 1 on several vacuum radiation pipe top, several arm 1 connects supervisor 2, and supervisor 2 connects power source 3(Fig. 1);
At reserved soil layer 4 after closely knit process forms sealing loading layer, the vacuum radiation pipe top of inserting the soil body is connected by arm 1, several arm 1 connects supervisor 2, supervisor 2 connects power source 3, now power source selects vacuum pump, start vacuum pump, negative pressure of vacuum produces negative pressure of vacuum 10 by the radiating aperture that vacuum radiation pipe body 6 is arranged to periphery liquefaction earth; The soil body is compression under negative pressure of vacuum 10 acts on, meanwhile the sealing loading layer of soil layer 4 formation is reserved under the condition of its gravity pressure in top, further preloading soil pressure 11 is produced to soil body compression, form self-load combined vacuum radiation consolidation, accelerate the compressive strain of the soil body, improve soil strength fast.
Connect the vacuum radiation guard system inserting the soil body, connect vacuum pump evacuation, form radiant type and vacuumize grid, check the sealing of each pipeline, guarantee that vacuum is 60 ~ 80KPa, under vacuumizing at the soil body condition forming negative pressure, the soil body of reserved soil layer 4, then because gravity pressure becomes heap carrier layer, under top soil pressure effect+lower vacuum negative pressure superposition condition, forms self-load combined vacuum radiation consolidation, accelerate the compressive strain of the soil body, improve soil strength (Fig. 2).
In practice of construction process, by changing the power source of vacuum radiation guard system, changing pressure water pump into by vacuum pump, then can make a variation as radiation pressure water filling grid, the substratum soil body is solved to the settlement by soaking (Fig. 3) of collapsible loess by pressure water flooding.
2.4, self-load combined vacuum radiation consolidation process monitoring
Vacuum-degree monitoring: self-load combined vacuum radiation consolidation process, mainly by vacuumizing substratum high humility soft loess, produces compression process middle and upper part soil body selfweight stress further to high humility soft loess loading effect at the soil body; Only while bottom high humility soft loess produces qualitative change, the top soil body just can produce the quantitative change of sedimentation, therefore under the condition vacuumized, the monitoring of vacuum is the Main Means of main monitoring, under General Proper reciprocal of duty cycle reaches the condition of 60 ~ 80KPa, the soil body really could reach the effect of compression concretion.
Settlement monitoring: self-load combined vacuum radiation consolidation process monitoring is needing reinforcing area to arrange sedimentation mark, it is 30m × 30m that sedimentation mark arranges grid, also can arrange according to designing requirement encryption, with the sedimentation on observation earth's surface in vacuum, according to code requirement, in pre-compaction process, within continuous five days, average settlement is less than 1mm/ days, illustrate down that the intensity of sleeping Saturated loess soil is recovered, can levelling of the land be carried out.
2.5, carry out top layer after levelling of the land completely ram or roll: dial except whole arm, supervisor and vacuum pump before completely ramming or rolling.
Step 3, payment detect
Complete after the construction of self-load combined vacuum radiation consolidation through above-mentioned steps, the every mechanics index of physics of high humility soft loess all can be largely increased.Can detect by designing requirement, conventional detection method can adopt dead load detection, static sounding detection, soil test sampling to detect.
The complex foundation consolidation process of the high saturated soft loess of embodiment one, deep layer
Engineering geological conditions:
This engineering is logistics stockyard, utilizes massif excavated-in t4 to be formed, embankment district area about 420,000 squares, and artificial embankment thickness is 20 ~ 37m, and saturated yielding thickness is 9 ~ 27m, and self-weight collapse settlement is 0.446 ~ 2.775m, and total collapse is 0.69 ~ 2.957m.Coefficient of collapsibility δ S is 0.001 ~ 0.163 to the maximum; Self-weight collapse coefficient δ ZS is 0.0000 ~ 0.157 to the maximum, for guaranteeing the use safety in logistics place, adopts collapsible loess deep to soak in advance Treatment by Dynamic Compaction.After this engineering method process, place average settlement 1.5m, earth's surface 8m scope characteristic load bearing capacity reaches 200KPa, and below 8m produces the soft loess of different conditions, and critical regions is liquefaction.On this basis, collapsible loess vacuum radiation concretion method is adopted to carry out consolidation process to this part soil body.
Step one, making sealing loading layer
Because collapsible loess deep is soaked after Treatment by Dynamic Compaction in advance, top layer 8m scope through forced ramming reinforcing process, form 6 ~ 8m, compactness reach more than 95% " crust layer ".Its substratum creates the saturated soft loess of uneven water content, and the top layer degree of compaction utilizing it to be formed directly as sealing loading layer, enters step 2.
Step 2, self-load combined vacuum radiation consolidation
Vacuum radiation guard system is arranged after foundation sealing loading layer:
2.1, vacuum radiation guard system mesh design: layout grid is 8m × 8m.
2.2, vacuum radiation pore boring: after determining vacuum radiation guard system grid, adopt board-plugging device according to the boring of vacuum radiation guard system grid, aperture is 150mm, and hole depth is 25m according to the thickness of high humility soft loess; Consider that soil body selfweight stress is to the compressive strain effect of the substratum soil body, actual hole depth is 20m, to reduce construction costs.
2.3, vacuum radiation guard system is arranged: vacuum radiation pipe adopts pvc pipe, radiating aperture 5 is designed apart from vacuum radiation pipe top below 8m, radiating aperture 5 diameter is 10mm, radiating aperture 5 spacing is 200mm, radiating aperture 5 is arranged along the tube wall of vacuum radiation pipe body 6, until at the bottom of vacuum radiation pipe pipe 7,7 shutoff at the bottom of vacuum radiation pipe pipe; Vacuum radiation pipe body 6 outsourcing 60 order ~ 80 order nylon leaching net 1 ~ 2 layer.
After vacuum radiation pipe inserts boring, adopt diameter be the pvc pipe of 600mm as arm, several vacuum radiation pipe connected, several arm connects supervisor, and supervisor connects vacuum pump;
Vacuum pump evacuation, form radiation and vacuumize grid, check the sealing of each pipeline, guarantee that vacuum is 60 ~ 80Kpa, under vacuumizing at the soil body condition forming negative pressure, the soil body of the certain thickness of shallow-layer is then because gravity pressure becomes heap carrier layer, under the dual superposition condition of top soil pressure effect+lower vacuum negative pressure, below the 8m soil body forms self-load combined vacuum radiation consolidation, accelerates the compressive strain of the soil body, improves soil strength.
2.4, self-load combined vacuum radiation consolidation process monitoring
Vacuum-degree monitoring: self-load combined vacuum radiation consolidation process, mainly by vacuumizing substratum high humility soft loess, produces compression process middle and upper part soil body selfweight stress further to the loading effect of high humility soft loess at the soil body; Only while bottom high humility soft loess produces quality, the top soil body just can produce the quantitative change of sedimentation, and therefore under the condition vacuumized, the monitoring of vacuum is the Main Means of main monitoring, under vacuum reaches the condition of 60KPa, the soil body really could reach the effect of compression concretion.
Settlement monitoring: self-load combined vacuum radiation consolidation process monitoring is needing reinforcing area to arrange sedimentation mark, it is 30m × 30m that sedimentation mark arranges grid, also can arrange according to designing requirement encryption, with the sedimentation on observation earth's surface in vacuum, according to code requirement, in pre-compaction process, within continuous five days, average settlement is less than 1mm/ days, illustrate down that the intensity of sleeping Saturated loess soil is recovered, can levelling of the land be carried out.
2.5, carry out top layer after levelling of the land completely ram or roll: dial except whole arm, supervisor and vacuum pump before completely ramming or rolling, completely ramming tamping energy is 1500KNm, and often 4 is hit.Through settlement observation, completely ramming settling amount is 0.8m.
Terminate the construction of self-load combined vacuum radiation consolidation.
Step 3, payment detect
Complete after the construction of self-load combined vacuum radiation consolidation through above-mentioned steps, the every mechanics index of physics of high humility soft loess all can be largely increased.Can detect by designing requirement, conventional detection method can adopt dead load detection, static sounding detection, soil test sampling to detect.
By the construction of the present invention's three steps, eliminate collapsible loess and to satisfy the low foundation treatment of Saturated loess soil bearing capacity of foundation soil that water is transformed.And can foundation construction be dropped into after treatment by collapsible loess of the present invention, comprise pile foundation construction, for Accelerating The Construction speed has established solid foundation.
Claims (5)
1. a collapsible loess vacuum radiation concretion method, is characterized in that the method comprises following processing step:
Step one, making sealing loading layer
The place of basic elimination collapsibility of loess, the top layer soil body produces the phenomenon of sedimentation and sedimentation inequality, with this understanding, carries out top layer consolidation process and makes sealing loading layer;
Step 2, self-load combined vacuum radiation consolidation
The sealing loading layer that this step is set up by top layer, the basis of sealing loading layer arranges vacuum radiation guard system, adopts vacuum pump to force soil body compression process by vacuum radiation guard system to substratum high humility soft loess;
Step 3, payment detect
Complete after the construction of self-load combined vacuum radiation consolidation through above-mentioned steps, the every mechanics index of physics of high humility soft loess all can be largely increased, and can detect by designing requirement.
2. a kind of collapsible loess vacuum radiation concretion method according to claim 1, is characterized in that the detailed description of the invention of step 2 is:
2.1, vacuum radiation guard system mesh design: be generally arranged as 4m × 4m or 8m × 8m, actual arrangement grid is arranged according to geological conditions and designing requirement;
2.2, vacuum radiation pore boring: according to the soil condition that need process, after determining vacuum radiation guard system grid, hole according to vacuum radiation guard system grid;
2.3, vacuum radiation guard system is arranged:
Design radiating aperture apart from vacuum radiation pipe top 6m ~ below 8m, radiating aperture is arranged along the tube wall of vacuum radiation pipe body, until at the bottom of vacuum radiation pipe pipe, and vacuum radiation pipe pipe bottom seal, vacuum radiation pipe body outsourcing nylon leaching net;
Several vacuum radiation pipe top is connected by arm after inserting boring by vacuum radiation pipe, and several arm connects supervisor, and supervisor connects vacuum pump, opens vacuum pump;
2.4, self-load combined vacuum radiation consolidation process monitoring
Vacuum-degree monitoring: guarantee that vacuum is 60 ~ 80KPa;
Settlement monitoring: average settlement was less than 1mm/ days in continuous five days, illustrates down that the intensity of sleeping Saturated loess soil is recovered, can carry out levelling of the land;
2.5, carry out top layer after levelling of the land completely ram or roll.
3. a kind of collapsible loess vacuum radiation concretion method according to claim 1, is characterized in that the making sealing loading layer in step one adopts strong rammer compacting, impact-rolling or vibroroller cmpacting compacting, slip casting chemical consolidation sealing or seals at top layer overlay film.
4. a kind of collapsible loess vacuum radiation concretion method according to claim 1, is characterized in that the detection method in step 3 adopts dead load detection, static sounding detects or soil test sampling detects.
5. a kind of collapsible loess vacuum radiation concretion method according to claim 2, it is characterized in that the monitoring of self-load combined vacuum radiation consolidation process is needing reinforcing area to arrange sedimentation mark, sedimentation mark arrange grid be 30m × 30m or according to designing requirement encryption arrange, to observe the sedimentation on earth's surface in vacuum.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108561082A (en) * | 2018-01-05 | 2018-09-21 | 中煤科工集团西安研究院有限公司 | Limestone aquifer inter-embedding type jet stream grout transformation method |
| CN108876918A (en) * | 2018-07-02 | 2018-11-23 | 长安大学 | A kind of high roadbed loess body sedimentation and deformation prediction technique |
| CN109914458A (en) * | 2019-02-21 | 2019-06-21 | 河海大学 | A kind of steel-pipe pile suitable for collapsible loess |
| CN112858633A (en) * | 2021-01-14 | 2021-05-28 | 三门峡职业技术学院 | Large-thickness collapsible loess humidifying deformation experimental device |
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