CN106320314A - Collapsible loess treatment method - Google Patents
Collapsible loess treatment method Download PDFInfo
- Publication number
- CN106320314A CN106320314A CN201610760377.6A CN201610760377A CN106320314A CN 106320314 A CN106320314 A CN 106320314A CN 201610760377 A CN201610760377 A CN 201610760377A CN 106320314 A CN106320314 A CN 106320314A
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- collapsible loess
- soil
- drilling rod
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- soil body
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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
-
- 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
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention provides a collapsible loess treatment method. The collapsible loess treatment method comprises the steps that (1) a drill stem with a spiral drill bit and a high-pressure jetting system is rotationally placed downwards; (2) after the drill stem is downwards placed to a certain depth, water is injected at high pressure, the drill stem is rotated simultaneously, and then high-pressure jet is formed and sprayed to soil rotationally, specifically, the water injection amount is no smaller than the water amount required when the layer of collapsible loess reaches the highest saturation degree; (3) the drill stem continues to be placed downwards, and high-pressure water injection and rotary spraying are carried out till the drill stem reaches the set depth; (4) the operations from step (1) to step (3) are carried out repeatedly at set intervals till the high-pressure water injection operation of deep-layer soil is completed in a whole foundation site; (5) the collapsibility subsidence amount of foundation soil is observed and recorded till collapse deformation of the foundation soil is stable; and (6) a shallow soil layer of a foundation is reinforced through a filler compaction method or a dynamic consolidation method.
Description
Technical field
The present invention relates to field of civil engineering, particularly relate to the basement process of collapsible loess.
Background technology
The loess area coverage of China is very big, is distributed widely in China northeast, northwest, Central China and the Huang of some areas, East China
Soil, and there is settlement by soaking more, collapsible loess is the soil of a kind of special nature, and its soil property is more uniform, short texture, hole are sent out
Educate.Not by water-soaked time, common intensity is higher, and compressibility is less.When under a certain pressure by water-soaked, soil structure can be rapidly
Destroying, produce bigger additional sinking, intensity reduces rapidly.At present in collapsible loess foundation processes, conventional processing method
Having, penetrate the pile foundation of collapsible soil layer, bed course changes laid process, lime-soil compaction pile method etc..But these methods have the limitation that it is certain,
As poor in pile foundation economy, when settlement by soaking thicker soil, cost is higher, constructs more difficult, and bed course changes laid process and is only applicable to not
There will be the building that regional level of ground water raises and load is little, lime-soil compaction pile method is due to the relatively low soil property of water content of soil relatively
The most compacted hard effect is poor.Currently also having the submerging consolidation method utilizing the characteristic of collapsible loess and use, its technique is general
It is to arrange immersion hole in the venue and after surrounding constructs dykes and dams, saturated yielding after place water delivery makes foundation soil body immersion in dykes and dams, this
Planting presoaking and the settlement by soaking eliminating loess is had certain effect, but there is also some difficult points and cannot solve, one is immersion
Easily cave in after soil body chance water in hole formation mud, affects the submerging consolidation effect of the soil body；Two is the soil body immersion effect of deeper
The most poor；Three is whole in place to cross water and evaporation times are long, causes accurately observation and the subsequent construction of saturated yielding settling amount
Difficulty；Four is to only eliminate relatively shallow-layer Loess Collapsibility, and its foundation bearing capacity is not met by the load requirement of building.
Summary of the invention
The present invention is in order to solve above-mentioned problem and to propose, it is therefore intended that provide the process side of a kind of collapsible loess
Method, the steps include:
1) in collapsible loess stratum, the drilling rod with augers and high-pressure injection system is rotated to being lowered into；
2) sinking to drilling rod to after certain depth, to the high-pressure injection system inner high voltage water filling of drilling rod, rotary drill rod makes water shape simultaneously
High-pressure spray is become to reach maximum saturation to drilling rod periphery soil body rotary-jet, the water yield injected not less than this layer of collapsible loess
The water yield required during degree；
3) the above-mentioned operation sinking to drilling rod high pressure water injection rotary-jet is persistently carried out, until set depth, this set depth etc.
In or less than the thickness on collapsible loess stratum；
4) according to the spacing set, step 1) is repeated to the operation of step 3), until in whole required soil layer
Complete the high pressure water injection operation of deep soil；
5) the settlement by soaking settling amount of foundation soil body is observed record, until the Collapsing Deformation of foundation soil body is stable；
6) use filler compacting method or heavy-tamping method that ground shallow soil body is carried out consolidation process.
Preferably, in the step 1) of above-mentioned processing method, above-mentioned high-pressure injection system includes being located at bottom drilling rod
Nozzle and be located at the feed pipe for mortar within drilling rod.
Preferably, the step 2 in above-mentioned processing method) in, the above-mentioned drilling rod that sinks to is to certain depth, and this degree of depth is more than 2m
Less than 10m.
Preferably, in the step 4) of above-mentioned processing method, the distance between stake holes is equal.
Preferably, in the step 5) of above-mentioned processing method, the standard that the Collapsing Deformation of foundation soil body is stable is last 5 days
Average saturated yielding amount less than 1mm/d.
Preferably, in the step 6) of above-mentioned processing method, the filler compacting method epibasal tier soil body over the ground is used to reinforce
Process, refer to arrange stake site in soil layer, after stake site pore-forming to certain depth, insert by several times in stake holes and fill out
Charge also utilizes weight to ram, and filling being repeated with tamping operation until forming compacted pile body at foundation surface, making ground
In base, the soil body of certain depth and scope obtains reinforcing closely knit.
Feature and the advantage of the processing method of above-mentioned collapsible loess are:
1. the feature of collapsible loess foundation is that soil property is harder, and the little speed of mode resistance therefore using spiral drill hole is fast, more
Deep-level location is arrived for easy pore-forming；2. the mode using rotary-jet injects water under high pressure in collapsible loess, can not only
Enough accelerate the injecting process, the effect improving water flowing and speed, a footpath can be expanded rapidly simultaneously thus improve the immersion of the soil body
Speed and effect；The water yield required when 3. reaching maximum saturation degree by calculating collapsible loess controls high pressure water injection
The water yield, carries out high pressure water injection after pore-forming certain depth simultaneously again, and the most whole work progress can be less than by controlling water level all the time
Earth's surface, reaches the effect of dry field operation, it is simple to the operation construction of machinery and personnel, also allows for the accurate sight to saturated yielding settling amount
Survey, and persistently the carrying out of subsequent construction；4. carrying out high pressure water injection after pore-forming certain depth again, its another purpose and effect are
Keep the shallow-layer soil body compression weight to deep soil so that deep soil preferably obtain saturated yielding sedimentation closely knit；5. exist
After the saturated yielding sedimentation of foundation soil body reaches requirement, by heavy-tamping method or the weight filler compacting method epibasal tier soil body the most over the ground
Carry out closely knit reinforcing, make the bearing capacity of foundation soil body be significantly improved, to meet the load requirement of upper building.
Accompanying drawing explanation
Fig. 1 is the process chart of an embodiment of the processing method of a kind of collapsible loess of the present invention.
Detailed description of the invention
Fig. 1 is the process chart of an embodiment of the processing method of a kind of collapsible loess of the present invention, first, such as Fig. 1
Shown in middle a, in collapsible loess stratum, the drilling rod 1 with augers and high-pressure injection system is rotated to being lowered into；So
After, as shown in b in Fig. 1, after sinking to drilling rod 1 to the 5m degree of depth, to the high-pressure injection system inner high voltage water filling of drilling rod 1, rotate simultaneously
Drilling rod 1 makes water form high-pressure spray to drilling rod periphery soil body rotary-jet；Then, as shown in c in Fig. 1, it is above-mentioned heavy persistently to carry out
Enter the operation of drilling rod 1 high pressure water injection rotary-jet, until set depth 20m；Then, as shown in d in Fig. 1, drilling rod 1 is proposed,
The settling amount of observational record collapsible loess self-collapsibility sedimentation, until the Collapsing Deformation of foundation soil body is stable；Then, such as Fig. 1
Shown in middle e, utilize the movement of falling object repeated stock soil body of elongated shape weight 2, form a diameter of 80cm, the degree of depth is 6m's
Stake holes；Then, as shown in f in Fig. 1, by several times insert rubble 3 and utilize weight 2 to ram in stake holes, make stake holes bottom and
Surrounding soil obtains reinforcing closely knit；Then, as shown in g in Fig. 1, filling and tamping operation are repeated until foundation surface,
Ground is formed compacted pile body.
Claims (6)
1. a processing method for collapsible loess, the steps include:
1) in collapsible loess stratum, the drilling rod with augers and high-pressure injection system is rotated to being lowered into；
2) sinking to drilling rod to after certain depth, to the high-pressure injection system inner high voltage water filling of drilling rod, rotary drill rod makes water shape simultaneously
High-pressure spray is become to reach maximum saturation to drilling rod periphery soil body rotary-jet, the water yield injected not less than this layer of collapsible loess
The water yield required during degree；
3) the above-mentioned operation sinking to drilling rod high pressure water injection rotary-jet is persistently carried out, until set depth, this set depth etc.
In or less than the thickness on collapsible loess stratum；
4) according to the spacing set, step 1) is repeated to the operation of step 3), until in whole required soil layer
Complete the high pressure water injection operation of deep soil；
5) the settlement by soaking settling amount of foundation soil body is observed record, until the Collapsing Deformation of foundation soil body is stable；
6) use filler compacting method or heavy-tamping method that ground shallow soil body is carried out consolidation process.
The processing method of collapsible loess the most according to claim 1, it is characterised in that above-mentioned steps 1) in, above-mentioned height
Pressure spraying system includes the nozzle being located at bottom drilling rod and is located at the feed pipe for mortar within drilling rod.
The processing method of collapsible loess the most according to claim 1, it is characterised in that above-mentioned steps 2) in, above-mentioned is heavy
Enter drilling rod to certain depth, this degree of depth more than 2m less than 10m.
The processing method of collapsible loess the most according to claim 1, it is characterised in that above-mentioned steps 4) in, between stake holes
Distance equal.
The processing method of collapsible loess the most according to claim 1, it is characterised in that above-mentioned steps 5) in, foundation soil body
The stable standard of Collapsing Deformation be that the average saturated yielding amount of last 5 days is less than 1mm/d.
The processing method of collapsible loess the most according to claim 1, it is characterised in that above-mentioned steps 6) in, use filler
The compacting method epibasal tier soil body over the ground carries out consolidation process, refers to arrange stake site in soil layer, at stake site pore-forming extremely
After certain depth, insert inserts and utilize weight to ram by several times in stake holes, filling being repeated and tamping operation is straight
To foundation surface, form compacted pile body, make the soil body of certain depth and scope in ground obtain reinforcing closely knit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610760377.6A CN106320314A (en) | 2016-08-30 | 2016-08-30 | Collapsible loess treatment method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610760377.6A CN106320314A (en) | 2016-08-30 | 2016-08-30 | Collapsible loess treatment method |
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| CN106320314A true CN106320314A (en) | 2017-01-11 |
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| CN201610760377.6A Pending CN106320314A (en) | 2016-08-30 | 2016-08-30 | Collapsible loess treatment method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106703004A (en) * | 2017-03-14 | 2017-05-24 | 王继忠 | Treatment method for collapsible loess foundation |
| CN106989993A (en) * | 2017-05-22 | 2017-07-28 | 中铁西北科学研究院有限公司 | A kind of coefficient of collapsibility of loess layering in-situ testing device and method of testing |
| CN109024531A (en) * | 2018-07-25 | 2018-12-18 | 中国十七冶集团有限公司 | A kind of collapsible loess foundation construction treating methods |
| CN109972607A (en) * | 2019-04-25 | 2019-07-05 | 中国水电基础局有限公司 | Drilling vibrating impacter, vibro-replacement stone column machine and soft groundsill reinforcing construction |
| CN112376541A (en) * | 2020-11-04 | 2021-02-19 | 中信国安建工集团有限公司 | Vibratory compaction device and vibratory compaction method for backfill area |
| CN113482527A (en) * | 2021-06-07 | 2021-10-08 | 兰州有色冶金设计研究院有限公司 | Collapsible loess foundation treatment equipment and method |
| CN113931164A (en) * | 2021-11-01 | 2022-01-14 | 西宁碧胜房地产开发有限公司 | Club-footed pile construction method for pre-soaking and compacting collapsible loess |
| CN113982022A (en) * | 2021-10-20 | 2022-01-28 | 兰州理工大学 | Construction method for eliminating collapsibility of cement stirring insertion pile in collapsible loess area |
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| JPH11269861A (en) * | 1998-03-20 | 1999-10-05 | East Japan Railway Co | Water injection method in recharge method |
| CN103790166A (en) * | 2014-01-25 | 2014-05-14 | 西安科技大学 | Method for treating foundation of loess area saturated zone slope filling and digging joint part |
| CN104131546A (en) * | 2014-07-02 | 2014-11-05 | 王继忠 | Collapsible loess foundation treatment method |
| CN104453723A (en) * | 2014-12-02 | 2015-03-25 | 江西中恒岩土工程技术有限公司 | Pore-forming construction method by mixing high pressure water with air in long screw pile in high clay layer |
| CN105735232A (en) * | 2016-02-18 | 2016-07-06 | 河海大学 | Collapsible loess wellpoint presoaking dynamic compaction replacement method |
-
2016
- 2016-08-30 CN CN201610760377.6A patent/CN106320314A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH11269861A (en) * | 1998-03-20 | 1999-10-05 | East Japan Railway Co | Water injection method in recharge method |
| CN103790166A (en) * | 2014-01-25 | 2014-05-14 | 西安科技大学 | Method for treating foundation of loess area saturated zone slope filling and digging joint part |
| CN104131546A (en) * | 2014-07-02 | 2014-11-05 | 王继忠 | Collapsible loess foundation treatment method |
| CN104453723A (en) * | 2014-12-02 | 2015-03-25 | 江西中恒岩土工程技术有限公司 | Pore-forming construction method by mixing high pressure water with air in long screw pile in high clay layer |
| CN105735232A (en) * | 2016-02-18 | 2016-07-06 | 河海大学 | Collapsible loess wellpoint presoaking dynamic compaction replacement method |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106703004A (en) * | 2017-03-14 | 2017-05-24 | 王继忠 | Treatment method for collapsible loess foundation |
| CN106989993A (en) * | 2017-05-22 | 2017-07-28 | 中铁西北科学研究院有限公司 | A kind of coefficient of collapsibility of loess layering in-situ testing device and method of testing |
| CN106989993B (en) * | 2017-05-22 | 2023-08-11 | 嘉兴学院 | Loess collapse coefficient layering in-situ test device and test method |
| CN109024531A (en) * | 2018-07-25 | 2018-12-18 | 中国十七冶集团有限公司 | A kind of collapsible loess foundation construction treating methods |
| CN109972607A (en) * | 2019-04-25 | 2019-07-05 | 中国水电基础局有限公司 | Drilling vibrating impacter, vibro-replacement stone column machine and soft groundsill reinforcing construction |
| CN109972607B (en) * | 2019-04-25 | 2024-04-26 | 中国水电基础局有限公司 | Drilling vibroflotation device and vibroflotation gravel pile machine |
| CN112376541A (en) * | 2020-11-04 | 2021-02-19 | 中信国安建工集团有限公司 | Vibratory compaction device and vibratory compaction method for backfill area |
| CN113482527A (en) * | 2021-06-07 | 2021-10-08 | 兰州有色冶金设计研究院有限公司 | Collapsible loess foundation treatment equipment and method |
| CN113982022A (en) * | 2021-10-20 | 2022-01-28 | 兰州理工大学 | Construction method for eliminating collapsibility of cement stirring insertion pile in collapsible loess area |
| CN113931164A (en) * | 2021-11-01 | 2022-01-14 | 西宁碧胜房地产开发有限公司 | Club-footed pile construction method for pre-soaking and compacting collapsible loess |
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Application publication date: 20170111 |
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