CN110685272A - 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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- CN110685272A CN110685272A CN201910899064.2A CN201910899064A CN110685272A CN 110685272 A CN110685272 A CN 110685272A CN 201910899064 A CN201910899064 A CN 201910899064A CN 110685272 A CN110685272 A CN 110685272A
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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
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, monitoring vertical deformation of a roadbed structure 12 through a roadbed settlement monitor 4 in the highway and railway operation stage, positioning a road section with the post-construction settlement exceeding a design standard, laying a monitoring system aiming at the top of the roadbed structure 12, a toe and a range 5 ~ 10m behind the toe in the treatment process, analyzing the stress and stability of the roadbed structure 12 and a foundation treatment pile body 3 to ensure the safety of the post-grouting construction process, and surveying the stratum information of the road section with the post-construction settlement exceeding the limit so as to better perform the calculation work of the step 2.
And 2, performing grouting parameters, hole position arrangement, drilling depth and angle, primary design and calculation of a cloth bag material and engineering quantity statistics by considering the structural position of the original foundation treatment pile body 3 according to settlement deformation data counted by the roadbed structure 12, wherein the cloth bag material is selected from a reel type and a common geotextile bag with the aspect ratio larger than 1/20 when the foundation treatment is a common treatment mode, the high-strength geotextile bag 2 with the reel type is adopted when the foundation treatment mode is a composite foundation treatment, the high-strength geotextile bag 2 is high in tensile strength, low in permeability coefficient and 1/30 ~ 1/50 in aspect ratio, the proper size of the cloth bag pile is selected according to the distance between the original foundation treatment pile bodies 3, the influence on the surrounding pile bodies is reduced, and a corrosion-resistant cloth bag is required for a saline soil area.
And 3, before the formal grouting construction stage, leveling the field and arranging hole sites on two sides of the transfinite roadbed structure 12, setting a drilling angle after the drilling machine is in place, using a common rotary drilling machine to perform mechanical inclined drilling operation in a soft soil bottom layer, placing a temporary sleeve 11 at a certain depth in an orifice, placing the temporary sleeve 11 in the drilling process, wherein the length and the position of the temporary sleeve are that the orifice extends inwards by 2 ~ 3m to ensure that the grouting opening 10 does not collapse, the diameter of the opening is 90mm ~ 200mm, and the opening angle and the depth are adjusted according to the original roadbed width and the length of the foundation treatment pile body 3, wherein as shown in figure 3, the front row hole site of the grouting opening 10 is positioned at the slope toe of the roadbed.
The pile arrangement positions and the drilling angle depth are defined, when foundation treatment is a common treatment mode, the pile arrangement positions are symmetrically and uniformly arranged on two sides of a treatment road section, the pile arrangement distance is 2 ~ 5m, the drilling depth is 5 ~ 10m, the angle between a drilling hole and the vertical direction is 45 degrees ~ 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 ~ 15m, and the angle between the drilling hole and the vertical direction is 30 degrees ~ 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.
Step 5, in the grouting construction stage, taking out the temporary casing 11, performing grouting operation on the periphery and the interior of the treated road section along the line range through the grouting ports 10 symmetrically arranged on two sides of the roadbed structure 12, adopting a grouting mode with jumping hole intervals to prevent slurry from mixing, reducing the peripheral grouting pressure and gradually increasing the internal grouting pressure, reducing the influence on the untreated section, adding a proper amount of retarder, preventing the grouting pipe 1 from being difficult to pull out in the grouting process, and performing deformation detection on the roadbed top, roadbed slope toe and the range 5 ~ 10m outside the slope toe in the treatment period, wherein the grouting parameters, grouting materials and monitoring frequency in the step 5 are set as follows:
grouting parameters, namely performing a grouting experiment on site before grouting, wherein the grouting pressure is generally 0.5Mpa ~ 3.0.0 Mpa, comprehensively considering factors such as the design angle and depth of a cloth bag pile, the grouting range, the roadbed lifting amount, the soil layer geological conditions and the like, taking a larger value as the cloth bag pile is deeper, taking a larger value as the grouting range is approximately close to the center of a treatment section, taking a smaller value as the roadbed lifting amount is approximately close to the design elevation, and obtaining a smaller value as the soil layer conditions are more complicated, and the grouting amount can be determined through the experiment and can be calculated through the step 2.
The grouting material is characterized in that grouting is carried out on a cloth bag pile through a grouting pipe 1, pure cement slurry is adopted as grouting liquid, cement used for grouting is common Portland cement no less than 325#, the water cement ratio is adjusted according to a treatment range and a grouting sequence, the control range is 1.0 ~ 0.5.5, the water cement ratio is smaller when the grouting liquid is closer to a treatment center and the grouting sequence is closer, a proper amount of bentonite can be added into a stirrer by adopting a mechanical blade type stirrer, the grout can be uniformly stirred, the grouting liquid needs to be uniformly sieved and then pumped, the grout needs to be continuously stirred in the grouting process, premature separation and precipitation are prevented, and meanwhile, 0.3% of ~ 0.5.5% of a compound water-reducing early strength agent can be added into the grout to increase the grouting property of the grout.
Monitoring frequency, the implementation method of the invention has extremely high requirements on the roadbed deformation in the grouting process, real-time monitoring is carried out in the grouting process, and after the grouting is finished, namely after the roadbed structure 12 reaches the original design elevation, the monitoring frequency of 3 ~ 5 days per week is carried out, so that the secondary settlement or the 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, in the construction process, attention needs to be paid to (1) under the precondition of a conditional condition, the displacement or the stress of a pile body 3 under a roadbed can be detected, the phenomenon that the foundation treatment pile body 3 generates excessive deflection due to excessive deformation of a soil body and influences the later normal use is prevented, (2) after the grouting pressure reaches the maximum value of the design pressure, the position of a grouting pipe 1 is timely adjusted to achieve the purpose of uniformly forming a cloth bag pile body 9, (3) after grouting, the grouting pipe 1 can be directly placed in the formed cloth bag pile body 9 to reduce the stress deformation of the pile body and achieve a better treatment effect, and (4) if the construction safety needs to be further improved, the vertical cloth bag pile arrangement can be carried out by utilizing the existing mechanical equipment within the range of 4 ~ 8m from the two sides of the roadbed structure 12, and a common geotechnical cloth bag grouting pile can be selected to form a pile to serve as a supporting structure on the two sides of the roadbed.
Claims (7)
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 primary design and calculation of grouting parameters, hole site arrangement, drilling depth and angle and material loss;
step 3, before the formal grouting construction stage, carrying out site leveling and hole site arrangement on two sides of the 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) at a distance of 2 ~ 3m 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 grouting pipe 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 at a preset position in the cloth bag pile hole (6);
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 2, the position of a grouting opening (10) is arranged, grouting parameters, cloth bag materials are selected, and engineering quantity statistics are carried out by counting the settlement detection result and considering the structure position of the original foundation treatment pile body (3), 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.
4. The method for controlling settlement overrun of soft foundation by using inclined hole cloth bag piles as claimed in claim 1, wherein pile arrangement positions and drilling hole angle depths in step 3 are defined, when the foundation treatment is a general treatment mode, the pile arrangement positions are symmetrically and uniformly arranged on two sides of a treatment road section, the hole arrangement distance is 2 ~ 5m, the drilling hole depth is 5 ~ 10m, the angle between the drilling hole and the vertical direction is 45 degrees ~ 75 degrees, when the foundation treatment mode is a composite foundation, the pile arrangement hole distance is consistent with the distance between pile bodies (3) of the composite foundation treatment, the pile arrangement positions are symmetrically or asymmetrically arranged according to actual field conditions, the drilling hole depth is 8 ~ 15m, the angle between the drilling hole and the vertical direction is 30 degrees ~ 75 degrees, and the temporary casing (11) is placed in the drilling process, and the length and position of the hole are 2 ~ 3m extending inwards, so that the grouting port (10) cannot collapse.
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: in the step 4, 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 bands (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.
6. The method for treating settlement overrun of soft foundation by using the inclined hole cloth bag pile as claimed in claim 1, wherein in the step 5, grouting operation is performed on the periphery and the inside of the treated section along the line, a grouting mode with jumping hole intervals is adopted to prevent grout from mixing, the peripheral grouting pressure is low, the internal grouting pressure is gradually increased to reduce the influence on the untreated section, a proper amount of retarder can be added in the grouting process to prevent the grouting pipe (1) from being difficult to pull out, deformation monitoring is performed on the top of the roadbed, the slope toe of the roadbed and the range 5 ~ 10m outside the slope toe in the treatment period, the monitoring frequency is real-time, and the monitoring frequency is performed 3 ~ 5 days per week after construction is completed.
7. 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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113737624A (en) * | 2021-09-13 | 2021-12-03 | 天津大学 | Bridge head bump bag type grouting repair construction method |
| CN113790308A (en) * | 2021-08-27 | 2021-12-14 | 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 |
| CN114658042A (en) * | 2022-04-08 | 2022-06-24 | 中冶建筑研究总院（深圳）有限公司 | High confined water head stratum double-pipe grouting bagged anti-floating anchor rod and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114658042A (en) * | 2022-04-08 | 2022-06-24 | 中冶建筑研究总院（深圳）有限公司 | High confined water head stratum double-pipe grouting bagged anti-floating anchor rod and construction method thereof |
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| CN110685272B (en) | 2022-03-01 |
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