CN116591156A - Wall protection slurry for deep silt soil layer bored pile and preparation method thereof - Google Patents
Wall protection slurry for deep silt soil layer bored pile and preparation method thereof Download PDFInfo
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- CN116591156A CN116591156A CN202310498113.8A CN202310498113A CN116591156A CN 116591156 A CN116591156 A CN 116591156A CN 202310498113 A CN202310498113 A CN 202310498113A CN 116591156 A CN116591156 A CN 116591156A
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- 239000002002 slurry Substances 0.000 title claims abstract description 116
- 239000002689 soil Substances 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 90
- 238000000034 method Methods 0.000 claims abstract description 37
- 239000004576 sand Substances 0.000 claims abstract description 37
- 238000005553 drilling Methods 0.000 claims abstract description 12
- 238000004445 quantitative analysis Methods 0.000 claims abstract description 10
- 238000002347 injection Methods 0.000 claims description 21
- 239000007924 injection Substances 0.000 claims description 21
- 229910000278 bentonite Inorganic materials 0.000 claims description 8
- 239000000440 bentonite Substances 0.000 claims description 8
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 claims 3
- 230000000694 effects Effects 0.000 abstract description 8
- 230000007547 defect Effects 0.000 description 16
- 238000010276 construction Methods 0.000 description 9
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000004927 clay Substances 0.000 description 2
- 238000004537 pulping Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/66—Mould-pipes or other moulds
- E02D5/68—Mould-pipes or other moulds for making bulkheads or elements thereof
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
- E02D13/06—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers for observation while placing
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention provides a preparation method of wall protection slurry for deep silt soil layer bored pile, which comprises the following steps: calculating to obtain the water consumption range required to be added when slurry with the relative density of 1.25-1.33 is formed in each cubic meter of undisturbed soil by a quantitative method; the pore-forming volume of the grouting pile is combined on site, the volume of undisturbed soil is calculated, the total water consumption range is obtained by combining the calculated water consumption per unit volume, and the relative density of formed slurry is controlled to be 1.25-1.33 by controlling the total water consumption of a slurry pump injected into a drill hole in the drilling process; tracking and determining whether the viscosity of the slurry is within 22-32Pa.s on site, and timely adjusting when the viscosity of the slurry exceeds the range; tracking and determining whether the sand content of the slurry is less than or equal to 6% on site, and timely adjusting when the sand content exceeds the range; the relative density of the wall protection slurry is 1.25-1.33, the viscosity of the slurry is 22-32Pa.s, the gel rate is more than or equal to 95%, and the sand content is less than or equal to 6%; the prepared mud wall protection effect is good, and the conditions of hole collapse, neck locking and rib exposing are not easy to cause.
Description
Technical Field
The invention relates to the technical field of bored piles, in particular to wall protection slurry for a deep mud layer bored pile and a preparation method thereof.
Background
Along with the development of economy in China, the construction technology level is continuously improved, construction engineering is continuously extended to the sky and the earth, the pile diameter of bored piles serving as pile foundations is increased, the pile length is increased, but deep mucky soil layers are often encountered in coastal areas and river areas, construction is carried out by passing through the soil layers, if technological measures are slightly improper, phenomena such as hole collapse, necking, rib exposing and the like are caused, the quality of the pile foundations is influenced, and waste piles are formed when serious, so that serious economic loss and construction period delay are caused.
Disclosure of Invention
In view of the shortcomings of the prior art, the invention aims to provide a wall protection slurry for a deep and thick mucky soil layer bored pile and a preparation method thereof, which are used for solving the problems that holes collapse, necking and rib exposing are easy to occur in construction of the geological soil layer bored pile with a thicker mucky soil layer in the prior art.
To achieve the above-mentioned objects and other related objects,
in a first aspect of the present invention, there is provided a method of preparing a dado mud for deep mud layer bored piles, comprising:
step S1, calculating unit water consumption by a quantitative method, and calculating to obtain a water consumption range which needs to be added when slurry with the relative density of 1.25-1.33 is formed in each cubic meter of undisturbed soil by the quantitative method;
s2, quantitatively controlling water injection quantity on site, calculating the volume of undisturbed soil by combining the pore-forming volume of the grouting pile, obtaining the total water consumption range by combining the water consumption per unit volume calculated in the step S1, and controlling the relative density of formed slurry to be 1.25-1.33 by controlling the total water consumption of a slurry pump injected into a drill hole in the drilling process;
s3, controlling the viscosity of the slurry, tracking and determining whether the viscosity of the slurry is within 22-32Pa.s on site, and adjusting the viscosity of the slurry in time when the viscosity of the slurry exceeds the range;
and S4, controlling the sand content, tracking and determining whether the sand content of the slurry is less than or equal to 6% on site, and adjusting in time when the sand content exceeds the range.
By adopting the technical scheme, the prepared mud wall protection effect is good, and the conditions of hole collapse, neck locking and rib exposing are not easy to cause.
In an embodiment of the present invention, in the quantifying method in the step S1, the water consumption calculating method includes:
ρ 1 ×1+10×△V＝ρ 2 ×(1+△V)；
wherein ρ is 1 Expressed as natural weight of undisturbed mucky soil per unit volume, KN/m 3 ；ρ 2 Expressed as the mud weight per unit volume, i.e. ten times the relative density of the required mud, in KN/m 3 The method comprises the steps of carrying out a first treatment on the surface of the DeltaV is the volume of water to be added to the undisturbed soil per unit volume, and the unit is m 3 。
By adopting the technical scheme, the water consumption in unit volume can be calculated by substituting the known natural heavy parameters of undisturbed soil and the slurry relative density standard to be controlled, and the total water injection rate can be calculated by combining the total volume of undisturbed soil.
In an embodiment of the present invention, the water injection rate control method in the step S2 includes: and a water tank is arranged below the water outlet of each water supply pipe, the height of the water level to be injected in each water tank is calibrated according to the length and width of the water tank, the total water quantity in all the water tanks is within the total slurry water injection quantity range, and then the water in each water tank is fully introduced into the drill hole.
By adopting the technical scheme, the situation that the actual water yield possibly has larger error due to subjective judgment and control of the water injection quantity by site construction workers according to construction experience is prevented.
In one embodiment of the present invention, in the step S2, a mud weight meter is used to measure the relative density of the mud after the water addition is completed and the mud is sufficiently stirred, and the subsequent step is performed after the relative density of the mud meets the set range.
By adopting the technical scheme, the calculated water injection quantity is verified.
In one embodiment of the present invention, in the step S3, a mud consistometer is used to measure the mud viscosity, if the measured mud viscosity is lower than the set lower threshold value of the mud viscosity, bentonite or tackifier is added into the mud and stirred sufficiently, and after each bentonite or tackifier is added, the mud viscosity is measured again until the measured mud viscosity is higher than the set lower threshold value of the mud viscosity, the bentonite or tackifier is stopped being added; if the measured slurry viscosity is higher than the set upper slurry viscosity threshold, adding water into the slurry and fully stirring, and re-measuring the slurry viscosity after each water addition until the measured slurry viscosity is lower than the set upper slurry viscosity threshold.
By adopting the technical scheme, the viscosity of the slurry is kept within the range of 22-32 Pa.s.
In an embodiment of the present invention, in the step S4, if the sand content is higher than the set upper limit of the sand content, the slurry is desanding through the sand filter.
By adopting the technical scheme, the sand content of the slurry is kept to be less than or equal to 6 percent.
In a second aspect of the invention, a wall protection slurry for deep mud soil layer bored piles is provided, wherein the relative density of the wall protection slurry is 1.25-1.33, the slurry viscosity is 22-32Pa.s, the gel rate is more than or equal to 95%, and the sand content is less than or equal to 6%.
By adopting the technical scheme, the mud wall protection effect is better, and the conditions of hole collapse, neck locking and rib exposing are not easy to cause.
In an embodiment of the invention, the sand content of the wall protection slurry is less than or equal to 4%.
By adopting the technical scheme, the sand content is further reduced, and the mechanical strength of the grouting pile is higher.
In one embodiment of the invention, the mud viscosity of the retaining wall mud is 22-30Pa.s.
By adopting the technical scheme, when the plasticity index IP of the geological clay layer of the site is 15.4-16.0, the clay content is higher, and the viscosity range of the slurry can be further limited to 22-30Pa.s.
As described above, the wall protection slurry for the deep silt soil layer bored pile and the preparation method thereof have the following beneficial effects:
1. the water injection quantity required by the slurry with the corresponding relative density is obtained by a quantitative method, the subjective judgment of the water injection quantity is not needed by relying on manual experience, and the relative density of the slurry is more accurate;
2. the slurry prepared by adopting the original soil pulping process has good wall protection effect, and is not easy to cause the conditions of hole collapse, neck locking and rib exposing.
Drawings
Fig. 1 is a flowchart showing a method for preparing a dado mud for deep mud layer bored piles according to an embodiment of the present invention.
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
Please refer to fig. 1. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the invention, are not intended to be critical to the essential characteristics of the invention, but are intended to fall within the spirit and scope of the invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
Example 1
Referring to fig. 1, the present invention provides a method for preparing wall protection slurry for deep mud layer bored pile, comprising:
step S1, calculating unit water consumption by a quantitative method, and calculating to obtain a water consumption range which needs to be added when slurry with the relative density of 1.25-1.33 is formed in each cubic meter of undisturbed soil by the quantitative method;
the water consumption calculating method in the quantitative method comprises the following steps:
ρ 1 ×1+10×△V＝ρ 2 ×(1+△V)；
wherein ρ is 1 Expressed as natural weight of undisturbed mucky soil per unit volume, KN/m 3 ；ρ 2 Expressed as the mud weight per unit volume, i.e. ten times the relative density of the required mud, in KN/m 3 The method comprises the steps of carrying out a first treatment on the surface of the DeltaV is the volume of water to be added to the undisturbed soil per unit volume, and the unit is m 3 ；
The water consumption in unit volume can be calculated by substituting the known natural heavy parameters of undisturbed soil and the slurry relative density standard to be controlled, and the total water injection rate can be calculated by combining the total volume of undisturbed soil;
verification of the quantification method: and (3) carrying out multiple indoor tests, analyzing the water consumption range required to be added when the original soil per cubic meter forms slurry with the relative density of 1.25-1.33, and comparing the water consumption range obtained by the tests with the calculated water consumption to confirm coincidence.
S2, quantitatively controlling water injection quantity on site, calculating the volume of undisturbed soil by combining the pore-forming volume of the grouting pile, obtaining the total water consumption range by combining the water consumption per unit volume calculated in the step S1, and controlling the relative density of formed slurry to be 1.25-1.33 by controlling the total water consumption of a slurry pump injected into a drill hole in the drilling process;
the water injection quantity control method comprises the following steps: setting a water tank below the water outlet of each water supply pipe, calibrating the height of water level to be injected in each water tank according to the length and width of the water tank, enabling the total water quantity in all the water tanks to be within the total slurry water injection quantity range, and then completely introducing the water in each water tank into the drill hole; the situation that the actual water yield possibly has larger error due to the fact that the water injection quantity is controlled by field construction workers according to subjective judgment of construction experience is prevented;
the method comprises the steps of measuring the relative density of slurry by adopting a slurry specific gravity meter after water addition is completed and the slurry is fully stirred, and carrying out subsequent steps after the relative density of the slurry meets a set range; and verifying the calculated water injection quantity.
S3, controlling the viscosity of the slurry, tracking and determining whether the viscosity of the slurry is within 22-32Pa.s on site, and adjusting the viscosity of the slurry in time when the viscosity of the slurry exceeds the range;
if the measured slurry viscosity is lower than a set lower threshold value of the slurry viscosity, bentonite or tackifier is added into the slurry and fully stirred, and the slurry viscosity is re-measured after each bentonite or tackifier is added until the measured slurry viscosity is higher than the set lower threshold value of the slurry viscosity; if the measured slurry viscosity is higher than the set slurry viscosity upper limit threshold, adding water into the slurry and fully stirring, and re-measuring the slurry viscosity after each water addition until the measured slurry viscosity is lower than the set slurry viscosity upper limit threshold; the viscosity of the slurry is kept within the range of 22-32 Pa.s.
S4, controlling the sand content, tracking and determining whether the sand content of slurry is less than or equal to 6% on site, and adjusting in time when the sand content exceeds the range;
the prepared mud wall protection effect is good, and the conditions of hole collapse, neck locking and rib exposing are not easy to cause;
if the sand content is higher than the set upper limit of the sand content, the mud is desanding through a sand passing device, so that the sand content of the mud is kept to be less than or equal to 6%.
Example two
The invention provides a wall protection slurry for deep silt soil layer bored piles, which is prepared by the method in the embodiment I, wherein the relative density of the wall protection slurry is 1.25-1.33, the viscosity of the slurry is 22-32Pa.s, the gel rate is more than or equal to 95%, and the sand content is less than or equal to 6%; the mud wall protection effect is better, is difficult to cause the condition of hole collapse, lock neck, muscle that appears.
Example III
The invention provides a wall protection slurry for deep silt soil layer bored piles, which is prepared by the method in the embodiment I, wherein the relative density of the wall protection slurry is 1.29, the viscosity of the slurry is 30Pa.s, the gel rate is 97%, and the sand content is 4%.
The drilling and grouting pile spot check result of the wall protection mud in the embodiment is as follows:
wherein, the I-type column represents the completeness of the pile body; the II type column indicates that the pile body has slight defects and does not influence the normal exertion of the bearing capacity of the pile body structure; the III column shows that the pile body has obvious defects and has influence on the bearing capacity of the pile body structure; class IV columns indicate that there are serious defects in the shaft.
Example IV
The invention provides a wall protection slurry for deep silt soil layer bored piles, which is prepared by the method in the embodiment I, wherein the relative density of the wall protection slurry is 1.25, the viscosity of the slurry is 22Pa.s, the gel rate is 95%, and the sand content is 6%.
The drilling and grouting pile spot check result of the wall protection mud in the embodiment is as follows:
wherein, the I-type column represents the completeness of the pile body; the II type column indicates that the pile body has slight defects and does not influence the normal exertion of the bearing capacity of the pile body structure; the III column shows that the pile body has obvious defects and has influence on the bearing capacity of the pile body structure; class IV columns indicate that there are serious defects in the shaft.
Example five
The invention provides a wall protection slurry for deep silt soil layer bored piles, which is prepared by the method in the embodiment I, wherein the relative density of the wall protection slurry is 1.33, the viscosity of the slurry is 32Pa.s, the gel rate is 98%, and the sand content is 4%.
The drilling and grouting pile spot check result of the wall protection mud in the embodiment is as follows:
wherein, the I-type column represents the completeness of the pile body; the II type column indicates that the pile body has slight defects and does not influence the normal exertion of the bearing capacity of the pile body structure; the III column shows that the pile body has obvious defects and has influence on the bearing capacity of the pile body structure; class IV columns indicate that there are serious defects in the shaft.
Comparative example one
The invention provides a wall protection slurry for deep silt soil layer bored piles, which is prepared by the method in the embodiment I, wherein the relative density of the wall protection slurry is 1.45, the viscosity of the slurry is 34Pa.s, the gel rate is 93%, and the sand content is 7%.
The drilling and grouting pile spot check result of the wall protection mud in the embodiment is as follows:
wherein, the I-type column represents the completeness of the pile body; the II type column indicates that the pile body has slight defects and does not influence the normal exertion of the bearing capacity of the pile body structure; the III column shows that the pile body has obvious defects and has influence on the bearing capacity of the pile body structure; class IV columns indicate that there are serious defects in the shaft.
Comparative example two
The invention provides a wall protection slurry for deep silt soil layer bored piles, which is prepared by the method in the embodiment I, wherein the relative density of the wall protection slurry is 1.15, the slurry viscosity is 19Pa.s, the gel rate is 93%, and the sand content is 7%.
The drilling and grouting pile spot check result of the wall protection mud in the embodiment is as follows:
wherein, the I-type column represents the completeness of the pile body; the II type column indicates that the pile body has slight defects and does not influence the normal exertion of the bearing capacity of the pile body structure; the III column shows that the pile body has obvious defects and has influence on the bearing capacity of the pile body structure; class IV columns indicate that there are serious defects in the shaft.
By comparing the results of the spot check of the third, fourth and fifth examples with those of the first and second comparative examples, it is known that: when the relative density of the wall-protecting slurry exceeds the range of 1.25-1.33, the viscosity of the slurry exceeds the range of 22-32Pa.s, the gel rate is less than 95%, and the sand content is more than 6%, a class III column and a class IV column can appear; when the relative density of the wall-protecting slurry is within the range of 1.25-1.33, the viscosity of the slurry is within the range of 22-32Pa.s, the gel rate is not less than 95%, and the sand content is not more than 6%, all the bored pile columns are I column and II column, and III column and IV column cannot appear.
The drilling of the bored pile for deep silt soil layer adopts a forward circulation drilling pore-forming process, the drill bit of the drilling machine adopts a conical three-wing drag bit, and the rotation speed is 13-42r/min.
In summary, the water injection quantity required by the slurry with the corresponding relative density is obtained by a quantitative method, the water injection quantity is not required to be subjectively judged by relying on manual experience, and the relative density of the slurry is more accurate; the slurry prepared by adopting the original soil pulping process has good wall protection effect, and is not easy to cause the conditions of hole collapse, neck locking and rib exposing. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (9)
1. A method for preparing a dado mud for deep mud layer bored piles, comprising the steps of:
step S1, calculating unit water consumption by a quantitative method, and calculating to obtain a water consumption range which needs to be added when slurry with the relative density of 1.25-1.33 is formed in each cubic meter of undisturbed soil by the quantitative method;
s2, quantitatively controlling water injection quantity on site, calculating the volume of undisturbed soil by combining the pore-forming volume of the grouting pile, obtaining a total water injection quantity range by combining the water consumption per unit volume calculated in the step S1, and controlling the relative density of formed slurry to be 1.25-1.33 by controlling the total water injection quantity injected into a drill hole by a slurry pump in the drilling process;
s3, controlling the viscosity of the slurry, tracking and determining whether the viscosity of the slurry meets the viscosity range of the slurry on site, and timely adjusting when the viscosity of the slurry exceeds the range;
and S4, controlling the sand content, tracking and determining whether the sand content of the slurry meets the sand content range on site, and timely adjusting when the sand content exceeds the range.
2. The method for preparing the dado mud for deep silt layer bored piles according to claim 1, wherein the method comprises the following steps: in the quantifying method in step S1, the water consumption calculating method includes:
ρ 1 ×1+10×△V＝ρ 2 ×(1+△V)；
wherein ρ is 1 Expressed as natural weight of undisturbed mucky soil per unit volume, KN/m 3 ；ρ 2 Expressed as the mud weight per unit volume, i.e. ten times the relative density of the required mud, in KN/m 3 The method comprises the steps of carrying out a first treatment on the surface of the DeltaV is the volume of water to be added to the undisturbed soil per unit volume, and the unit is m 3 。
3. A method of preparing a retaining wall slurry for deep mud layer bored piles according to claim 2, wherein: the water injection amount control method in the step S2 comprises the following steps: and a water tank is arranged below the water outlet of each water supply pipe, the height of the water level to be injected in each water tank is calibrated according to the length and width of the water tank, the total water quantity in all the water tanks is within the total slurry water injection quantity range, and then the water in each water tank is fully introduced into the drill hole.
4. A method of preparing a retaining wall slurry for deep mud layer bored piles according to claim 3, wherein: in the step S2, a mud weight meter is used to measure the relative density of the mud after the water addition is completed and the mud is sufficiently stirred, and the subsequent step is performed after the relative density of the mud meets the set range.
5. The method for preparing the dado mud for the deep silt layer bored pile according to claim 4, which is characterized in that: in the step S3, a mud consistometer is adopted to measure the mud viscosity, if the measured mud viscosity is lower than a set lower threshold value of the mud viscosity, bentonite or tackifier is added into the mud and fully stirred, and after each bentonite or tackifier is added, the mud viscosity is measured again until the measured mud viscosity is higher than the set lower threshold value of the mud viscosity, the bentonite or tackifier is stopped being added; if the measured slurry viscosity is higher than the set upper slurry viscosity threshold, adding water into the slurry and fully stirring, and re-measuring the slurry viscosity after each water addition until the measured slurry viscosity is lower than the set upper slurry viscosity threshold.
6. The method for preparing the dado mud for the deep silt layer bored pile according to claim 5, which is characterized in that: in the step S4, if the sand content is higher than the set upper limit of the sand content, the slurry is desanding by a sand filter.
7. A dado mud for deep mud layer cast-in-situ bored piles prepared by the method according to any one of claims 1 to 6, wherein: the relative density of the wall protection slurry is 1.25-1.33, the viscosity of the slurry is 22-32Pa.s, the gel rate is more than or equal to 95%, and the sand content is less than or equal to 6%.
8. A dado mud for deep mud layer cast-in-situ bored piles as set forth in claim 7, wherein: the sand content of the wall protection slurry is less than or equal to 4 percent.
9. A dado mud for deep mud layer cast-in-situ bored piles as set forth in claim 7, wherein: the mud viscosity of the wall protection mud is 22-30Pa.s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310498113.8A CN116591156A (en) | 2023-05-05 | 2023-05-05 | Wall protection slurry for deep silt soil layer bored pile and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310498113.8A CN116591156A (en) | 2023-05-05 | 2023-05-05 | Wall protection slurry for deep silt soil layer bored pile and preparation method thereof |
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| CN116591156A true CN116591156A (en) | 2023-08-15 |
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| CN202310498113.8A Pending CN116591156A (en) | 2023-05-05 | 2023-05-05 | Wall protection slurry for deep silt soil layer bored pile and preparation method thereof |
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