CN114508095A - High-pressure slurry wall protection construction method - Google Patents
High-pressure slurry wall protection construction method Download PDFInfo
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Abstract
The invention discloses a high-pressure mud dado construction method, which comprises the following steps: 1) calculating and determining the thickness of a weak stratum in a stratum where a borehole is located and the thickness of other strata; 2) carrying out conventional mud wall protection on a stable stratum close to the bottom of a borehole; 3) installing high-pressure slurry wall protection equipment; 4) performing high-pressure slurry wall protection; 5) a recovery device; 6) conventional mud fencing is performed on the stable formation above the borehole. The invention provides a high-pressure slurry wall protection method, which can be used for performing high-pressure slurry wall protection aiming at the problem that the drilling wall of a weak stratum is easy to collapse, overcomes the defect that the existing slurry wall protection technology is difficult to form a stable wall protection mud layer on the drilling wall of the weak stratum, and is easy to realize and wide in application range.
Description
Technical Field
The invention belongs to the field of civil engineering foundation reinforcement, and particularly relates to a high-pressure slurry retaining wall construction method.
Background
With the continuous promotion of urbanization, the demands on traffic, high-rise buildings and the like are increasing. In the fields of subways, bridges, buildings and the like, the hole forming technology of the rotary drilling rig is widely applied. However, due to the concealment of the stratum, the drilling design scheme is difficult to avoid the drilling position design in the stratum which is difficult to form holes or easy to collapse, such as a weak layer. Therefore, in practical engineering, a plurality of drilled holes are formed in a weak stratum, particularly in loess areas and coastal areas, due to the strong water permeability and low cohesiveness of the stratum, in the hole forming process, the hole wall collapse phenomenon is very frequent, so that the construction progress is delayed, the construction difficulty is increased, and the construction cost is increased.
Disclosure of Invention
Aiming at the problem of hole wall collapse of drilling holes in a weak stratum, the invention aims to provide a high-pressure slurry retaining wall construction method, which can effectively improve the quality of slurry retaining walls and reduce the occurrence of hole wall collapse accidents.
The high-pressure mud dado construction method comprises the following steps:
1) according to the mass and the volume of soil or rock samples taken out in the hole forming process of a drilling machine, calculating and determining the thickness of a weak stratum in the stratum where the drill hole is located and the thickness of other strata;
2) performing conventional mud wall protection on the stable stratum close to the bottom of the borehole according to the thicknesses of all the stratums determined in the step 1);
3) after the wall protection process in the step 2) is finished, installing high-pressure slurry wall protection equipment: the high-pressure wall protection equipment comprises an air compressor, a lower plugging bag, an upper plugging bag, a slurry pump and a slurry conduit, wherein the air compressor is connected with the lower plugging bag and the upper plugging bag through the conduits respectively; the mud pump is communicated with the mud guide pipe; installing a lower plugging bag below the weak stratum, installing an upper plugging bag above the weak stratum, and installing a slurry guide pipe to the position of the weak stratum or the easy-collapse hole stratum;
4) starting an air compressor to charge high-pressure air into the downward plugging bag and the upper plugging bag through the guide pipes to enable the weak stratum to be in a closed space, then conveying the prefabricated slurry to a drilling section of the weak stratum through the slurry guide pipes through a slurry pump, and keeping the pressure stable to ensure that the slurry forms a stable wall protecting layer;
5) after the construction of the retaining wall layer in the step 4) is finished, pumping out high-pressure air in the lower plugging bag and the upper plugging bag through an air compressor, and recovering the plugging bags;
6) conventional mud fencing is performed on the stable formation above the borehole.
In the step 1), the mass of the taken soil or rock sample is divided by the density of the soil or rock sample and then divided by the cross-sectional area of the drilled hole, so that the lengths of the drilled holes corresponding to different soil/rock stratums can be obtained.
In the step 3), the high-pressure wall protecting equipment further comprises an air pressure gauge, an air flow meter, a mud flow meter and a mud pressure gauge, wherein the air pressure gauge and the air flow meter are arranged at the position where the air compressor is connected with the guide pipe, and the mud flow meter and the mud pressure gauge are arranged at the position where the mud pump is connected with the mud guide pipe.
In the step 3), the lower plugging bag and the upper plugging bag are plugging bags of capsule structures made of high-toughness materials, the plugging bags are easy to expand after being filled with high-pressure gas, the expanded appearance is cylindrical or round cake-shaped, the diameter of the expanded appearance is larger than that of a drilled hole, and a flexible sealing cushion layer is attached to the part, in contact with the wall of the drilled hole, of each plugging bag, so that high-pressure slurry can be kept stable.
In the step 4), after the air compressor charges high-pressure air into the downward plugging bag and the upper plugging bag, the friction force F between the lower plugging bag and the drill hole wall and the friction force F between the upper plugging bag and the drill hole wall need to be calculated; friction force F during high pressure mud wall protectionaThe force F required to act on the plugging capsule is greater than that of the slurrys。
Preferably, said friction force FaThe calculation process of (2) is as follows: firstly, the air pressure P in the lower plugging bag and the upper plugging bag is read by an air pressure meter and an air flow meteraAssuming that the diameter of a drilled hole is D, the height of the plugging bag is h, and the friction coefficient between the plugging bag and the hole wall is k, the formula F is adopteda＝πDhPak calculating the frictional force Fa。
The pressure of the high-pressure slurry acting on the plugging bag is PsBy the formula Fs＝πD2PsCalculating the force F of high-pressure mud acting on the plugging bags。
In the step 4), when the pressure of the high-pressure slurry is kept stable, the pressure P of the slurry is greater than the pore water pressure P of the weak stratumWRespectively reading the mud pressure P through a mud pressure gauge and a mud flowmetersVolume V of slurry0When the high-pressure mud protects the wall, the conditions need to be judged: fa>Fs>FwAnd the quality of the high-pressure mud for protecting the wall of the hole in the weak stratum can be ensured.
Preferably, the pore water pressure FwComprises two parts of hydrostatic pressure and ground stress, and the calculation formula is Pw＝(γ1+γ2)C，γ1Is the unit weight of water, in N/m3，γ2Is the unit weight of the stratum and has the unit of N/m3C is the burial depth, i.e. the pore water pressure at the burial depth C, and if the pore water pressure is uniformly applied to the wall of the borehole, the force of the pore water pressure applied to the wall of the borehole can be determined by Fw＝πDHPwAnd (6) performing calculation.
Preferably, assuming that the thickness of the drilling section of the weak stratum is H and the thickness of the mud wall of the mud protecting wall is s, the volume of the drilling section of the weak stratum is V0＝(πD2H/4), the sum of the volume of the mud wall of the drilling section of the weak stratum and the volume of the drilling section of the weak stratum is V1＝(π(D+2s)2H/4), and the slurry wall-protecting coefficient ks＝[(V1-V0)/V0]100% slurry wall coefficient of high pressure slurry wallsNeed to be greater than usualAnd (5) regulating slurry and protecting the wall.
The invention has the beneficial effects that: the invention provides a high-pressure slurry wall protection method, which can be used for performing high-pressure slurry wall protection aiming at the problem that the drilling wall of a weak stratum is easy to collapse, overcomes the defect that the existing slurry wall protection technology is difficult to form a stable wall protection mud layer on the drilling wall of the weak stratum, and is easy to realize and wide in application range.
Drawings
FIG. 1 is a schematic view of the construction of the present invention.
In the figure, 1-an air compressor, 2-an air pressure gauge, 3-an air flow meter, 4-an air conduit, 5-an air conduit, 6-a borehole wall, 7-an upper plugging bag, 8-a lower plugging bag, 9-a slurry pump, 10-a slurry flow meter, 11-a slurry pressure meter, 12-a slurry conduit, 13-a high-pressure slurry retaining wall, 14-a conventional section slurry retaining wall, 15-a stable stratum I, 16-a weak stratum II, 17-a stable stratum III.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the drawings in the embodiments of the present invention, and it is obvious that the embodiments described herein are some embodiments of the present invention, but not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Example 1
Referring to fig. 1, a schematic diagram of a high-pressure mud dado construction method is shown. The mud dado construction method in the embodiment comprises the following steps:
the method comprises the following steps: according to the mass and volume of soil or rock samples taken out in the hole forming process of a drilling machine, the bottom layer of the drilled hole is from top to bottom and comprises a stable stratum I15 in combination with the figure 1; weak formation II 16 and stable formation III 17; the mass of the taken out soil or rock sample is divided by the density of the soil or rock sample and then divided by the cross-sectional area of the drilled hole, so that the lengths of the drilled holes corresponding to different soil/rock stratums can be obtained, and in the embodiment, the diameter of the drilled hole is 0.8 m; measuring the thickness of the corresponding stable stratum I15 to be 5 m; the thickness of the weak stratum II 16 is 8m, the thickness of the stable stratum III 17 is 12m, the thickness of the conventional mud retaining wall mud wall is less than 2mm, but the thickness of the conventional mud retaining wall mud wall can be more than 2mm for the weak sandy soil stratum, so the thickness of the conventional mud retaining wall mud wall is 2 mm.
Step two: firstly, performing conventional mud retaining on a stable stratum III 17 close to the bottom of a borehole, wherein the retaining coefficient k iss0.5%, resulting in a conventional section slurry retaining wall 14.
Step three: and after the wall protecting process of the stable stratum III 17 at the bottom of the hole is finished, high-pressure slurry wall protecting equipment is installed. Specifically, according to the structure, as shown in fig. 1, the lower plugging bag 8 is arranged below the weak stratum II 16 and is connected with the air compressor 1 through the air conduit 5; the upper plugging bag 7 is arranged above the weak stratum II 16 and is connected with the air compressor 1 through the air conduit 4; an air pressure gauge 2 and an air flow meter 3 are arranged at the positions where the air conduit 4 and the air conduit 5 are connected with the air compressor 1; the slurry outlet of the slurry guide pipe 12 is arranged at the position of the weak stratum II 16, the slurry guide pipe 12 is connected with the slurry pump 9, and a slurry flowmeter 10 and a slurry pressure gauge 11 are arranged at the connection position.
Wherein: the lower plugging bag 8 and the upper plugging bag 7 are made of high-toughness materials and are of capsule structures, high-pressure gas is filled into the plugging bags, the plugging bags are easy to expand, the expanded appearance is cylindrical, the diameter of the expanded appearance is larger than that of a drill hole, and a flexible sealing cushion layer is attached to the part, in contact with the wall of the drill hole, of each plugging bag, so that high-pressure slurry can be kept stable.
Step four: starting an air compressor 1 to respectively charge high-pressure air into an upper plugging bag 7 and a lower plugging bag 8 through air ducts 4 and 5; according to the known conditions, the diameter of the drilled hole is D0.8 m, the height of the plugging bladder is h 1m, the friction coefficient between the plugging bladder and the hole wall is k 0.7, and the air pressure P in the plugging bladder can be known from the air pressure gauge 2a4.5MPa, finally according to formula Fa＝πDhPak calculating the frictional force Fa＝7912.8kN(Fa＝πDhPak＝3.14*0.8m*1m*4500kN/m20.7-7912.8 kN), the mud pressure P can be obtained from the mud pressure gauge 12s11.9MPa, the force of the high-pressure slurry on the occlusion bag 7 can be determined according to the formula Fs＝πD2PsCalculated as 5978.6kN (F)s＝πD2Ps/4＝3.14*0.8*0.8*11900kN/m2/4＝5978.56kN)。
According to the water gravity gamma1＝10000N/m3Gravity of the formation gamma2＝20000N/m3If the pore water pressure is uniformly applied to the borehole wall, taking the vertical midpoint of the drilling section of the weak stratum as an example, i.e. taking the position where the burial depth C is 9m as an example, calculating the force F of the pore water pressure of the weak stratum II 16 applied to the borehole wall of the weak stratum according to the known conditionsW＝5425.9kN[Fw＝πDHPw＝πDH(γ1+γ2)C＝3.14*0.8m*8m*(10000+20000)N/m3*9m＝5425.92kN](ii) a According to the conditions of the high-pressure mud retaining wall, Fa>Fs>FWWhen the pressure F of the high-pressure mud applied to the plugging bag 7 is controlleds6000kN (which can be controlled by the mud pressure gauge 11);
the thickness of the drilling section of the soft stratum II 16 is H-8 m, and the volume of the drilling section of the soft stratum is V0＝(πD2H/4), the sum of the volume of the mud wall of the drilling section of the weak stratum and the volume of the drilling section of the weak stratum is V1＝(π(D+2s)2H/4), when the conventional slurry wall protection process is adopted, V0＝(πD2H/4)＝3.14*(0.8m)2*8m/4＝4.0192m3，V1＝(π(D+2s)2H/4)＝3.14*(0.8m+2*0.002m)2*8m/4＝4.0595m3The conventional slurry wall protection coefficient ks＝[(V1-V0)/V0]*100％＝[(4.0595m3-4.0192m3)/4.0192m3]100% ═ 1.0%. For the high-pressure slurry dado construction method provided by the invention, V is controlled only by the slurry flowmeter 101Greater than 4.0595m3For example, when the thickness of the mud wall of the mud retaining wall reaches 3mm, the sum of the volume of the mud wall at the drilling section of the weak stratum and the volume of the drilling section of the weak stratum is V1＝4.0797m3Then, the mud dado coefficient k of the high-pressure mud dado construction method provided by the inventions＝[(V1-V0)/V0]*100％＝[(4.0797m3-4.0192m3)/4.0192m3]100% -. 1.5%, it is considered that the slurry retaining wall requirement of the weak formation section (slurry retaining wall coefficient k of high-pressure slurry retaining wall) is satisfiedsRequiring more than a conventional mud dado).
And performing a high-pressure mud retaining wall process on the weak stratum II 16 according to the calculated process parameters to obtain the high-pressure mud retaining wall 13.
Step five: after the construction of the wall protection layer in the fourth step is finished, pumping out high-pressure air in the lower plugging bag 8 and the upper plugging bag 7 by an air compressor, and recovering the plugging bags;
step six: conventional mud dado, coefficient of dado k, was performed on a stable formation I15 in the upper part of the boreholesIs 0.5%.
The hole-drilling wall protection method in the embodiment has a significantly reduced porosity collapse rate compared with the conventional wall protection method.
Claims (10)
1. A high-pressure mud dado construction method comprises the following steps:
1) according to the mass and the volume of soil or rock samples taken out in the hole forming process of a drilling machine, calculating and determining the thickness of a weak stratum in the stratum where the drill hole is located and the thickness of other strata;
2) performing conventional mud wall protection on the stable stratum close to the bottom of the borehole according to the thicknesses of all the stratums determined in the step 1);
3) after the wall protection process in the step 2) is finished, installing high-pressure slurry wall protection equipment: the high-pressure wall protection equipment comprises an air compressor, a lower plugging bag, an upper plugging bag, a slurry pump and a slurry conduit, wherein the air compressor is connected with the lower plugging bag and the upper plugging bag through the conduits respectively; the mud pump is communicated with the mud guide pipe; installing a lower plugging bag below the weak stratum, installing an upper plugging bag above the weak stratum, and installing a slurry guide pipe to the position of the weak stratum or the easy-collapse hole stratum;
4) starting an air compressor to charge high-pressure air into the downward plugging bag and the upper plugging bag through the guide pipes to enable the weak stratum to be in a closed space, then conveying the prefabricated slurry to a drilling section of the weak stratum through the slurry guide pipes through a slurry pump, and keeping the pressure stable to ensure that the slurry forms a stable wall protecting layer;
5) after the construction of the wall protection layer in the step 4) is finished, pumping out high-pressure air in the lower plugging bag and the upper plugging bag by an air compressor, and recovering the plugging bags;
6) conventional mud fencing is performed on the stable formation above the borehole.
2. The high-pressure mud dado construction method according to claim 1, wherein in the step 1), the drilling hole length corresponding to different soil/rock layers can be obtained by dividing the mass of the extracted soil or rock sample by the density of the extracted soil or rock sample and then by the cross-sectional area of the drilling hole.
3. The high-pressure mud dado construction method of claim 1, wherein in step 3), the high-pressure dado equipment further comprises an air pressure gauge, an air flow meter, a mud flow meter and a mud pressure gauge, wherein the air pressure gauge and the air flow meter are arranged at the position where the air compressor is connected with the conduit, and the mud flow meter and the mud pressure gauge are arranged at the position where the mud pump is connected with the mud conduit.
4. The high-pressure mud retaining wall construction method according to claim 1, wherein in the step 3), the lower blocking bag and the upper blocking bag are made of high-toughness materials and are of capsule structures, the lower blocking bag and the upper blocking bag are easy to expand after being filled with high-pressure gas, the outer shape of the expanded blocking bag is cylindrical or round cake-shaped, the diameter of the expanded blocking bag is larger than the diameter of the drilled hole, and a flexible sealing cushion layer is attached to the part, in contact with the wall of the drilled hole, of the blocking bag, so that the high-pressure mud can be kept stable.
5. The high-pressure mud retaining wall construction method according to claim 1, wherein in the step 4), after the air compressor fills high-pressure air into the downward plugging bag and the upper plugging bag, the friction force F between the drilling hole wall and the lower plugging bag and the drilling hole wall and the friction force F between the drilling hole wall and the drilling hole wall are calculateda(ii) a Friction force F during high pressure mud wall protectionaRequire more than mud to act on the sealForce on the blocking bladder Fs。
6. The method of claim 5, wherein the frictional force F is a force of frictionaThe calculation process of (2) is as follows: firstly, the air pressure P in the lower plugging bag and the upper plugging bag is read by an air pressure meter and an air flow meteraAssuming that the diameter of a drilled hole is D, the height of the plugging bag is h, and the friction coefficient between the plugging bag and the hole wall is k, the formula F is adopteda＝πDhPak calculating the frictional force Fa。
7. The high-pressure mud retaining wall construction method as claimed in claim 5, wherein in the step 4), the force F of the mud acting on the blocking bagsBy the formula Fs＝πD2PsCalculating the force F of high-pressure mud acting on the plugging bags。
8. The high-pressure mud dado construction method of claim 5, wherein in the step 4), when the high-pressure mud pressure is kept stable, the mud pressure F is setsShould be greater than the pore water pressure P of the weak stratumWRespectively reading the mud pressure P through a mud pressure gauge and a mud flowmetersVolume V of slurry0When the high-pressure mud protects the wall, the conditions need to be judged: fa>Fs>FwAnd the quality of the high-pressure mud for protecting the wall of the hole in the weak stratum can be ensured.
9. The high-pressure mud dado construction method of claim 8, wherein in the step 4), the pore water pressure P is higher than the pore water pressure PwComprises two parts of hydrostatic pressure and ground stress, and the calculation formula is Pw＝(γ1+γ2)C，γ1Is the unit weight of water, in N/m3，γ2Is the unit weight of the stratum and has the unit of N/m3C is the burial depth, i.e. the pore water pressure at the burial depth C, which acts on the wall of the borehole assuming that the pore water pressure acts uniformly on the wall of the boreholeThe force of the borehole wall can be passed through Fw＝πDHPwAnd (6) performing calculation.
10. The high-pressure mud dado construction method of claim 8, wherein assuming that the thickness of the drilling section of the weak stratum is H and the mud dado wall thickness is s, the drilling section of the weak stratum has a drilling volume V0＝(πD2H/4), the sum of the volume of the mud wall of the drilling section of the weak stratum and the volume of the drilling section of the weak stratum is V1＝(π(D+2s)2H/4), and the slurry wall-protecting coefficient ks＝[(V1-V0)/V0]100% slurry wall coefficient of high pressure slurry wallsRequiring more than a conventional mud dado.
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| JPH06146253A (en) * | 1992-11-02 | 1994-05-27 | Nippon Kiso Gijutsu:Kk | Method of protecting wall of drilled hole |
| CN106087994A (en) * | 2016-08-25 | 2016-11-09 | 中国水利水电第四工程局有限公司 | A kind of high pressure jet grouting pore-forming dado structure and construction method thereof |
| CN107575249A (en) * | 2017-10-31 | 2018-01-12 | 河南理工大学 | A kind of high-pressure slurry wall protecting method and device |
| CN111501761A (en) * | 2020-05-08 | 2020-08-07 | 都城伟业集团有限公司 | Offshore steel pipe pile distributed post-grouting device, pneumatic grouting assembly and construction method |
| CN113152456A (en) * | 2021-05-10 | 2021-07-23 | 江苏富路建设有限公司 | Reverse circulation drilling and grouting enlarged footing anchor rod construction method |
| CN113279415A (en) * | 2021-05-09 | 2021-08-20 | 苏州中车建设工程有限公司 | High-pressure slurry retaining wall construction method for grooving underground continuous wall |
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2022
- 2022-02-24 CN CN202210172235.3A patent/CN114508095B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06146253A (en) * | 1992-11-02 | 1994-05-27 | Nippon Kiso Gijutsu:Kk | Method of protecting wall of drilled hole |
| CN106087994A (en) * | 2016-08-25 | 2016-11-09 | 中国水利水电第四工程局有限公司 | A kind of high pressure jet grouting pore-forming dado structure and construction method thereof |
| CN107575249A (en) * | 2017-10-31 | 2018-01-12 | 河南理工大学 | A kind of high-pressure slurry wall protecting method and device |
| CN111501761A (en) * | 2020-05-08 | 2020-08-07 | 都城伟业集团有限公司 | Offshore steel pipe pile distributed post-grouting device, pneumatic grouting assembly and construction method |
| CN113279415A (en) * | 2021-05-09 | 2021-08-20 | 苏州中车建设工程有限公司 | High-pressure slurry retaining wall construction method for grooving underground continuous wall |
| CN113152456A (en) * | 2021-05-10 | 2021-07-23 | 江苏富路建设有限公司 | Reverse circulation drilling and grouting enlarged footing anchor rod construction method |
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