CN110685272B - Method for treating soft foundation settlement overrun by utilizing inclined-hole cloth bag pile - Google Patents
Method for treating soft foundation settlement overrun by utilizing inclined-hole cloth bag pile Download PDFInfo
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- CN110685272B CN110685272B CN201910899064.2A CN201910899064A CN110685272B CN 110685272 B CN110685272 B CN 110685272B CN 201910899064 A CN201910899064 A CN 201910899064A CN 110685272 B CN110685272 B CN 110685272B
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- 239000004744 fabric Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000011282 treatment Methods 0.000 claims abstract description 46
- 238000010276 construction Methods 0.000 claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 5
- 239000010959 steel Substances 0.000 claims abstract description 5
- 238000005553 drilling Methods 0.000 claims description 30
- 238000012544 monitoring process Methods 0.000 claims description 13
- 239000002002 slurry Substances 0.000 claims description 11
- 238000013461 design Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 6
- 239000004746 geotextile Substances 0.000 claims description 3
- 238000011369 optimal treatment Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000009191 jumping Effects 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 230000035699 permeability Effects 0.000 claims description 2
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- 239000002689 soil Substances 0.000 abstract description 17
- 239000004568 cement Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
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- 238000012545 processing Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
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- 238000006073 displacement reaction Methods 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
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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
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- Architecture (AREA)
- Soil Sciences (AREA)
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Abstract
The invention discloses a method for treating settlement overrun of a soft foundation by utilizing inclined hole cloth bag piles, which is suitable for post-construction settlement overrun treatment engineering of the soft foundation and comprises cloth bag pile bodies, pipe end and pipe top positioning sleeves, a steel bar chuck, plugs, temporary binding bands and other structures. The invention can give full play to grouting efficiency, reduce grouting loss, has controllable treatment process, small risk and low cost, has small influence on natural stratum environment in the grouting process, accords with the principle of environment-friendly construction, and can safely and effectively solve the problem of over-limit of post-construction settlement in soft soil areas.
Description
Technical Field
The invention belongs to a technology for treating the settlement overrun of a roadbed after construction, and particularly relates to a method for treating the settlement overrun of a soft foundation by utilizing an inclined hole cloth bag pile.
Background
With the large-scale construction and investment of public and railway roads in China, the problem of settlement overrun after construction of the roadbed in a soft soil area increases year by year, and the driving safety and comfort are seriously affected, mainly because of the high water content and high compressibility of the soft soil. In the scheme of treating subside through floral tube slip casting now, not only need additionally to increase the stake equipment of spouting soon and carry out the curtain construction, there is very big waste at the slip casting in-process simultaneously, in meeting areas such as groundwater runoff, bottom cavity, the less infiltration path in soil layer crack is not smooth, floral tube slip casting effect can greatly reduced.
Therefore, at present, a method for over-limit treatment of soft foundation settlement is urgently needed, which can effectively solve the problem of post-construction settlement in the operation period of road engineering, can maximize resource utilization in the treatment process, has good engineering applicability and has little influence on driving and natural environment.
Disclosure of Invention
The invention aims to provide a method for treating soft foundation settlement overrun by utilizing inclined hole cloth bag piles, which can fully play the grouting effect, reduce grouting loss, has controllable treatment process, small risk and low cost, has small influence on the natural stratum environment in the grouting process, accords with the environment-friendly construction principle, and can solve the problem of settlement overrun after construction according to local conditions, accurate control, safety and effectiveness.
The technical solution for realizing the purpose of the invention is as follows: a method for treating settlement overrun of soft foundation by utilizing inclined hole cloth bag piles comprises the following steps:
step 1, carrying out settlement detection and overrun condition statistics on a roadbed structure along a road project to be treated in an operation stage by using a roadbed settlement monitor, carrying out construction work point positioning on an overrun road section, and analyzing the stress and stability of the roadbed structure and a foundation treatment pile body to ensure the safety of a later grouting construction process;
step 5, in the grouting construction stage, taking out the sleeve, performing grouting operation on the inside of the cloth bag by using a grouting pipe through grouting ports symmetrically arranged on two sides of the roadbed structure, adopting a grouting process of 'less grouting for many times', slowly adjusting the position of the grouting pipe while rotating grouting, and dynamically adjusting the grouting amount and the grouting speed based on the deformation monitoring result of the roadbed structure so as to achieve the optimal treatment effect;
and 6, monitoring the settlement of the subgrade settlement monitor in real time, pulling out the grouting pipe when the subgrade structure reaches the designed elevation, sealing the cloth bag and plugging a grouting opening, and finally finishing the over-limit treatment of the soft subgrade settlement.
Compared with the prior art, the invention has the remarkable advantages that:
(1) when the conventional floral tube grouting treatment of subgrade settlement is carried out, additional construction machinery is needed to construct jet grouting piles or stirring piles on two sides of a subgrade to play a role in strengthening the subgrade and waterproof curtains so as to prevent injected grout from finally losing to two sides of the subgrade, the inclined-hole cloth-bag pile can be drilled and formed into a pile through the self-owned machinery to form a vertical cloth-bag pile to play a role in strengthening the subgrade, meanwhile, the loss of cement grout in the treatment process is not needed to worry, additional auxiliary measures in the treatment process are not needed to be added, and the treatment cost is reduced.
(2) In a deep soft soil area, in the traditional flower tube grouting treatment process, part of cement slurry injected finally flows into a deep lower horizontal layer or directly flows out of the ground surface, so that great waste is generated, and in the grouting process of the inclined hole cloth bag pile, the cement slurry is only distributed in the cloth bag structure, so that the injected slurry is utilized to the maximum extent.
(3) In the traditional perforated pipe grouting treatment process, the final treatment effect is relatively large in relation to the soil layer structure, the permeation path and the soil layer cracks, and the perforated pipe grouting treatment effect is greatly reduced in the areas with poor soil layer structure, unsmooth permeation path and small soil layer cracks; the inclined hole cloth bag grouting pile is only related to the pile forming quality in the treatment process, the treatment degree can be freely adjusted by increasing the grouting amount or the grouting pressure in a soft soil area, and the optimal treatment effect can be achieved by combining with the deformation monitoring of the top of the roadbed.
(4) In the treatment process, the injection slurry greatly reduces the infiltration of cement slurry to surrounding soil due to the existence of the cloth bag structure, weakens the influence on underground water or surface water environment to the maximum extent, has the function of environmental protection, and reduces the secondary treatment process of the environment in the later period.
(5) The construction method is suitable for various foundation treatment modes such as roadbed structures and soft soil layers.
Drawings
FIG. 1 is a flow chart of the method for treating the settlement overrun of the soft foundation by using the inclined hole cloth bag pile.
FIG. 2 is a schematic diagram of the cross section arrangement of the inclined-hole cloth bag pile before grouting.
FIG. 3 is a schematic plan view of a settlement overrun hole site of a special subgrade treated by the cloth bag pile of the invention.
Fig. 4 is a schematic diagram showing the comparison between the front and the back of the cloth bag grouting according to the present invention, wherein (a) is a schematic diagram before the cloth bag grouting, and (b) is a schematic diagram after the cloth bag grouting.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
With reference to fig. 1, a method for treating soft foundation settlement overrun by using inclined-hole cloth bag piles comprises the following steps:
step 1: referring to fig. 2, the roadbed settlement monitor 4 is used for monitoring the vertical deformation of the roadbed structure 12 in the public and railway operation stages, positioning the road section with settlement after work exceeding the design standard, meanwhile, the monitoring system is arranged in the range of 5-10 m behind the top, toe and toe of the roadbed structure 12 in the treatment process, and meanwhile, the stress and stability of the roadbed structure 12 and the foundation treatment pile body 3 are analyzed, so that the safety of the later grouting construction process is ensured; and (4) surveying the stratum information of the post-construction settlement overrun road section so as to better perform the calculation work of the step 2.
Step 2: subside through roadbed structure 12 statistics warp data, consider original ground simultaneously and handle 3 structural position of pile body, carry out slip casting parameter, hole site arrangement, drilling depth and angle, sack material primary design and calculation to and engineering volume statistics, the sack material is selected when the ground is handled to general processing mode, and aspect ratio is greater than 1/20's reel type, general geotechnological sack, and when the ground processing mode was handled for compound ground, adopt the tensile slightly high, and the permeability coefficient is low, and aspect ratio is 1/30~ 1/50's reel type's high strength geotechnological fabric bag 2, handles 3 intervals according to original ground and selects suitable sack stake sizes, reduces the influence to the pile body on every side, to salt water soil area, need adopt corrosion resistance's sack.
And step 3: before the formal grouting construction stage, site leveling and hole site arrangement are carried out on two sides of an ultralimit roadbed structure 12, a drilling angle is set after a drilling machine is in place, a common rotary drilling machine is used for carrying out mechanical inclined drilling operation in a soft soil bottom layer, a temporary sleeve 11 is placed at a certain depth position in an orifice, the temporary sleeve 11 is placed in the drilling process, the length and the position of the temporary sleeve are that the orifice extends inwards for 2-3 m, it is ensured that a grouting opening 10 cannot collapse, the diameter of the opening is 90-200 mm, the opening angle and the depth are adjusted according to the original roadbed width and the length of a foundation treatment pile body 3, and as shown in figure 3, a front row hole site of the grouting opening 10 is located at a roadbed slope toe.
The pile arrangement positions and the drilling angle depth are defined, when the foundation treatment is a common treatment mode, the pile arrangement positions and the drilling angle depth are symmetrically and uniformly arranged on two sides of a treatment road section, the hole arrangement distance is 2-5 m, the drilling depth is 5-10 m, the angle between a drilling hole and the vertical direction is 45-75 degrees, when the foundation treatment mode is a composite foundation, the pile arrangement distance is consistent with the distance between pile bodies of the composite foundation, the pile arrangement positions and the drilling angle depth are symmetrically or asymmetrically arranged according to field conditions, the drilling depth is 8-15 m, and the angle between the drilling hole and the vertical direction is 30-75 degrees.
And 4, step 4: referring to fig. 4, a cloth bag pile hole 6 is formed after drilling to a designed elevation, a grouting pipe 1 is sleeved in the cloth bag, the bottom end of the grouting pipe 1 and the bottom end of the cloth bag are sealed by a plug 7, the top end of the grouting pipe is fixed by a steel bar chuck 8, the grouting amount and the grouting time can be controlled by the chuck 7, a rubber sleeve can be tightly hooped outside the opening of the grouting pipe 1 to cover the grouting hole and prevent recharging, a temporary binding belt 5 is used for binding the grouting hole in the middle, and the grouting pipe is placed in the hole position arranged in the step 3.
And 5: in the grouting construction stage, the temporary sleeve 11 is taken out, grouting operation is carried out on the periphery and the inside of the treated road section along the line range through the grouting ports 10 symmetrically arranged on two sides of the roadbed structure 12, a grouting mode with jumping hole intervals is adopted to prevent slurry from mixing, the peripheral grouting pressure is small, the internal grouting pressure is gradually increased, the influence on the untreated section is reduced, a proper amount of retarder can be added, and the grouting pipe 1 is prevented from being difficult to pull out in the grouting process. And in the treatment period, deformation detection is carried out on the top of the roadbed, the slope toe of the roadbed and the range of 5-10 m outside the slope toe. The grouting parameters, grouting materials and monitoring frequency in the step 5 are set as follows:
grouting parameters: before grouting, grouting experiments are carried out on site, grouting pressure is generally 0.5-3.0 Mpa, the design angle and depth of cloth bag piles, the grouting range, the roadbed lifting amount, soil layer geological conditions and other factors are comprehensively considered, the deeper the cloth bag piles are, the larger the grouting range is, the smaller the roadbed lifting amount is, the design elevation is, the soil layer conditions are complex, and the grouting amount can be calculated through the step 2.
Grouting materials: the invention uses the grouting pipe 1 to grout the cloth bag pile, the grouting liquid uses pure cement paste, the cement used in grouting is not less than 325# ordinary portland cement, the water cement ratio is adjusted according to the treatment range and the grouting sequence, the control range is 1.0-0.5, the closer to the treatment center, the closer to the grouting sequence, the smaller the water cement ratio. The stirrer adopts a blade type mechanical stirrer, a proper amount of bentonite can be added to enable slurry to be uniformly stirred, grouting liquid needs to be uniformly sieved and then pumped, in the grouting process, the slurry needs to be continuously stirred to prevent premature separation and precipitation, and meanwhile, 0.3-0.5% of composite water-reducing early strength agent can be added into the slurry to improve the grouting property of the slurry.
Monitoring frequency: the implementation method has extremely high requirements on the roadbed deformation in the grouting process, the grouting process needs to be monitored in real time, and after grouting is finished, namely after the roadbed structure 12 reaches the original design elevation, the monitoring frequency is carried out for 3-5 days per week, so that secondary settlement or roadbed continuous lifting is prevented.
Step 6: according to the calculation and detection results in the step 2 and the step 5, after the designed elevation is reached, the grouting pipe 1 is pulled out or the grouting pipe 1 is directly placed in the cloth bag pile body 9 as a reinforcement body, then cloth bag sealing and grouting opening 10 plugging are carried out, and finally the soft foundation settlement overrun treatment is completed.
In addition, the following needs to be noted in the construction process: (1) under the conditional premise, the displacement or stress of the pile body 3 under the foundation can be detected, so that the phenomenon that the foundation treatment pile body 3 generates excessive deflection to influence the later normal use due to the excessive deformation of the soil body is prevented; (2) when the grouting pressure reaches the maximum value of the design pressure, the position of the grouting pipe 1 is adjusted in time so as to achieve the purpose of uniformly forming the cloth bag pile body 9; (3) after grouting, the grouting pipe 1 can be directly placed in the formed cloth bag pile body 9 so as to reduce the stress deformation of the pile body and achieve better treatment effect; (4) if the construction safety needs to be further improved, the existing mechanical equipment can be used for arranging the vertical cloth bag piles within the range of 4-8 m away from the two sides of the roadbed structure 12, and common geotextile bags can be selected for grouting and forming piles to serve as supporting structures on the two sides of the roadbed.
Claims (5)
1. A method for treating settlement overrun of soft foundation by utilizing inclined hole cloth bag piles is characterized by comprising the following steps:
step 1, carrying out settlement detection and overrun condition statistics on a roadbed structure along a road project to be treated in an operation stage by using a roadbed settlement monitor (4), carrying out construction work point positioning on an overrun road section, and analyzing the stress and stability of the roadbed structure (12) and a foundation treatment pile body (3) at the same time to ensure the safety of a later grouting construction process;
step 2, based on the settlement detection result of the roadbed structure (12), performing preliminary design and calculation of grouting parameters, hole site arrangement, drilling depth and angle and material loss, specifically as follows:
the method comprises the following steps of setting a grouting opening (10) according to a settlement detection result of statistics and the structural position of an original foundation treatment pile body (3), selecting grouting parameters and cloth bag materials, and counting engineering quantities, wherein the cloth bag materials are selected as follows:
when the original foundation treatment is a common treatment mode, a common geotextile bag with the aspect ratio of more than 1/20 is adopted, and when the foundation treatment mode is a composite foundation treatment, a high-strength geotextile bag (2) with the tensile strength, the light degree, the low permeability coefficient and the aspect ratio of 1/30-1/50 is adopted;
step 3, before the formal grouting construction stage, carrying out site leveling and hole site arrangement on two sides of a roadbed structure (12) to be treated, setting a drilling angle after a drilling machine is in place, carrying out drilling operation, and placing a temporary sleeve (11) 2-3 m away from a hole opening;
step 4, drilling to a designed elevation to form a cloth bag pile hole (6), sleeving a grouting pipe (1) into the cloth bag, plugging two ends of the cloth bag by using plugs (7) and a steel bar chuck (8), binding 1/4, 1/2 and 3/4 parts of the cloth bag by using temporary binding tapes (5), and placing the cloth bag pile hole (6) at a preset position, wherein the preset position is as follows:
before the cloth bag sleeved with the grouting pipe (1) is placed, the grouting pipe (1) and the bottom end of the cloth bag are sealed by using a plug (7), the top end of the cloth bag is fixed by using a steel bar chuck (8), the grouting amount and the grouting time can be controlled by using the chuck, temporary binding belts (5) are respectively used for binding 1/4, 1/2 and 3/4 parts of the cloth bag, the size before grouting is reduced, and the cloth bag is placed in corresponding hole positions in the step 3;
step 5, in the grouting construction stage, taking out the sleeve (11), performing grouting operation on the inside of the cloth bag through grouting ports (10) symmetrically arranged on two sides of the roadbed structure (12) by using the grouting pipe (1), adopting a grouting process of 'less grouting for many times', slowly adjusting the position of the grouting pipe (1) while rotating grouting, and dynamically adjusting the grouting amount and the grouting speed based on the deformation monitoring result of the roadbed structure (12) to achieve the optimal treatment effect;
and 6, monitoring the settlement of the subgrade settlement monitor (4) in real time, pulling out the grouting pipe (1) when the subgrade structure (12) reaches the designed elevation, sealing the cloth bag and plugging the grouting opening (10), and finally finishing the over-limit treatment of the settlement of the soft subgrade.
2. The method for governing the settlement overrun of the soft foundation by using the inclined hole cloth bag pile as claimed in claim 1, is characterized in that: the road overrun condition is counted in the step 1, different overrun management schemes are designed according to the overrun degree, the difference is in the arrangement of cloth bag pile holes (6) and the setting of grouting parameters, and meanwhile, the structural damage of a roadbed structure (12) and the warping deformation affecting the bearing capacity of a pile body in the foundation treatment pile body (3) are avoided in the grouting process.
3. The method for governing the settlement overrun of the soft foundation by using the inclined hole cloth bag pile as claimed in claim 1, is characterized in that: in the step 3, pile arrangement positions and drilling angle depths are defined, when foundation treatment is a common treatment mode, piles are symmetrically and uniformly arranged on two sides of a treatment road section, the hole arrangement distance is 2-5 m, the drilling depth is 5-10 m, the angle between a drilling hole and the vertical direction is 45-75 degrees, when the foundation treatment mode is a composite foundation, the distance between the pile arrangement holes and the distance between pile bodies (3) of the composite foundation treatment are kept consistent, the piles are symmetrically or asymmetrically arranged according to actual conditions on site, the drilling depth is 8-15 m, and the angle between the drilling hole and the vertical direction is 30-75 degrees; the temporary casing (11) is placed in the drilling process, the length and the position of the temporary casing are 2-3 m of inward extension of an orifice, and collapse of the grouting port (10) is avoided.
4. The method for governing the settlement overrun of the soft foundation by using the inclined hole cloth bag pile as claimed in claim 1, is characterized in that: in the step 5, for the range along the line of the treated road section, grouting operation is performed firstly on the periphery and then on the inside, a grouting mode with jumping hole intervals is adopted, so that slurry crossing is prevented, the peripheral grouting pressure is low, the internal grouting pressure is gradually increased so as to reduce the influence on the untreated section, a proper amount of retarder is added in the grouting process, and the grouting pipe (1) is prevented from being difficult to pull out in the grouting process; and in the treatment period, deformation monitoring is carried out in the range of 5-10 m outside the top, the toe and the toe of the roadbed, the monitoring frequency is real-time, and after construction is finished, the monitoring frequency is carried out for 3-5 days per week.
5. The method for governing the settlement overrun of the soft foundation by using the inclined hole cloth bag pile as claimed in claim 1, is characterized in that: and 6, after reaching the designed elevation according to the calculation and detection results in the steps 2 and 5, pulling out the grouting pipe (1) or directly placing the grouting pipe (1) in the cloth bag pile body (9) as a reinforcement body.
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| CN201910899064.2A CN110685272B (en) | 2019-09-23 | 2019-09-23 | Method for treating soft foundation settlement overrun by utilizing inclined-hole cloth bag pile |
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| CN201910899064.2A CN110685272B (en) | 2019-09-23 | 2019-09-23 | Method for treating soft foundation settlement overrun by utilizing inclined-hole cloth bag pile |
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| CN113790308B (en) * | 2021-08-27 | 2023-05-05 | 深圳大学 | Volume intelligent regulation and control air bag pile capable of reducing influence of back soil in pipe jacking construction and regulation and control method |
| CN113737624A (en) * | 2021-09-13 | 2021-12-03 | 天津大学 | Bridge head bump bag type grouting repair construction method |
| CN114658042B (en) * | 2022-04-08 | 2024-07-30 | 中冶建筑研究总院（深圳）有限公司 | High-pressure-bearing water head stratum double-pipe grouting bagged anti-floating anchor rod and construction method thereof |
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| JP2006070513A (en) * | 2004-08-31 | 2006-03-16 | Sekkeishitsu Soil:Kk | Height adjusting method of structure |
| CN100582380C (en) * | 2007-09-10 | 2010-01-20 | 铁道第四勘察设计院 | Cloth bag grouting pile-forming method |
| CN104452741A (en) * | 2014-11-30 | 2015-03-25 | 中铁二十局集团第一工程有限公司 | Technique for constructing reinforcing cloth bag grouting pile of coastal soft soil foundation |
| CN105064157A (en) * | 2015-07-30 | 2015-11-18 | 同济大学 | Treatment method of settlement of high-speed railway roadbeds in soft-soil areas |
| CN208201874U (en) * | 2018-04-25 | 2018-12-07 | 中铁四院集团岩土工程有限责任公司 | A kind of open-cell cloth bag grouting structure |
| CN108487239B (en) * | 2018-05-16 | 2023-07-14 | 山东建筑大学 | Cloth bag pile structure with expandable reinforcement cage and construction process |
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