WO2021017798A1 - Construction method for achieving large-diameter deep mixing on basis of resistance reduction - Google Patents
Construction method for achieving large-diameter deep mixing on basis of resistance reduction Download PDFInfo
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- WO2021017798A1 WO2021017798A1 PCT/CN2020/101637 CN2020101637W WO2021017798A1 WO 2021017798 A1 WO2021017798 A1 WO 2021017798A1 CN 2020101637 W CN2020101637 W CN 2020101637W WO 2021017798 A1 WO2021017798 A1 WO 2021017798A1
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- Prior art keywords
- mixing
- construction
- carbon nanotubes
- slurry
- drill
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- 238000002156 mixing Methods 0.000 title claims abstract description 161
- 238000010276 construction Methods 0.000 title claims abstract description 83
- 230000009467 reduction Effects 0.000 title claims abstract description 19
- 239000002002 slurry Substances 0.000 claims abstract description 65
- 239000000463 material Substances 0.000 claims abstract description 61
- 239000004568 cement Substances 0.000 claims abstract description 47
- 238000005553 drilling Methods 0.000 claims abstract description 47
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 42
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 42
- 239000002563 ionic surfactant Substances 0.000 claims abstract description 34
- 238000003756 stirring Methods 0.000 claims abstract description 32
- 239000002689 soil Substances 0.000 claims abstract description 24
- 238000005507 spraying Methods 0.000 claims abstract description 15
- 238000013461 design Methods 0.000 claims abstract description 14
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 57
- 230000008569 process Effects 0.000 claims description 41
- 238000002347 injection Methods 0.000 claims description 30
- 239000007924 injection Substances 0.000 claims description 30
- 239000000243 solution Substances 0.000 claims description 25
- 230000035515 penetration Effects 0.000 claims description 20
- 239000007921 spray Substances 0.000 claims description 18
- 238000012360 testing method Methods 0.000 claims description 12
- 239000011398 Portland cement Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 230000009466 transformation Effects 0.000 claims description 4
- 239000002071 nanotube Substances 0.000 claims description 2
- 239000008213 purified water Substances 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 206010001497 Agitation Diseases 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- 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
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B12/00—Accessories for drilling tools
Definitions
- the invention relates to the technical field of pile foundation construction, in particular to a construction method for realizing large-diameter deep mixing based on a resistance reduction method.
- Cement-soil deep mixing pile is a method used to reinforce soft soil foundation. It uses cement as a curing agent, and through special mixing machinery and slurry pump, the soft soil and curing agent are forced to mix and mix in the depth of the foundation. A series of physical and chemical reactions between the agent and the soft soil harden the soft soil into a composite foundation with integrity, water stability and high foundation bearing capacity.
- the present invention proposes a construction method for realizing large-diameter deep mixing based on a resistance reduction method.
- the present invention proposes a construction method for realizing large-diameter deep mixing based on a resistance reduction method, which overcomes the deficiencies of the prior art.
- a new type of drill bit is manufactured to achieve the function of reducing resistance; by spraying ionic surfactant solution to reduce the resistance of the stirring blade; by mixing carbon nanotubes in the cement slurry to form a new type of solidified material, It is conducive to the full mixing of slurry and soil; different construction parameters are used under different geological conditions, targeted construction, construction efficiency is improved, and the quality of the mixing pile is guaranteed.
- Step 1 Preparation of construction site, configuration and transformation of construction equipment
- a mixing drill bit matching the mixing diameter is set.
- the mixing drill bit is composed of a mixing drill rod, a main mixing blade and a double mixing blade.
- the radius of the main mixing blade and the double mixing blade are consistent with the design mixing diameter; 1-10 solidified material injection ports are uniformly arranged on the back of the blade, and the direction of the solidified material injection port is consistent with the outer normal direction of the back of the main stirring blade; the radius of the main stirring blade is evenly set with 1-10 resistance reducing materials on the lower edge of the front part of the main stirring blade Spray port, the direction of the spray port of the resistance-reducing material is perpendicular to the lower edge of the main stirring blade and is inclined upward along the surface of the main stirring blade; connect the configured stirring bit and the connecting drill rod through the thread, and then combine the stirring bit and the connecting drill rod as a whole
- the drilling rig is connected by flanges;
- Step 2 Configuration of resistance reducing material and curing material
- the resistance-reducing material is an ionic surfactant solution
- the curing material is a cement slurry mixed with carbon nanotubes; among them, the mixing mass of the ionic surfactant is 0%-10% of the mass of the stirred soil, and the ionic surface is active
- the concentration range of the agent solution is 0%-8%; the length of the carbon nanotubes is 2-20 microns, the outer wall diameter is 2-20 microns, and the mass ratio of carbon nanotubes in the cement slurry is 0%-1%.
- the water-cement ratio of the slurry is 1-2;
- Step 3 Mix and drill down construction
- the ionic surfactant solution is continuously sprayed through the resistance-reducing material spray port, and the spray pressure is 0.5-20MPa;
- Step 4 Mixing and lifting construction
- the cement slurry mixed with carbon nanotubes is continuously sprayed through the curing material injection port, the spraying pressure is 0.5-20MPa, and the spraying volume of the slurry during the drilling lifting process is 60%-80% of the total slurry spraying volume;
- Step 5 Drilling and construction under secondary mixing
- Step 6 Secondary mixing and drilling construction
- the cement slurry mixed with carbon nanotubes is continuously sprayed through the curing material injection port.
- the injection pressure is 0.5-20MPa.
- the slurry injection volume during the secondary drilling process is 20% of the total slurry injection volume. -40%;
- Step 7 When the mixing bit is raised to the design height, the mixing operation is completed and the construction is over.
- the standard penetration base N value is dynamically adjusted to the configuration plan of the mixing and spraying slurry.
- the specific configuration plan is as follows:
- the concentration of 0%-1% ionic surfactant solution is selected, and the mixing quality of ionic surfactant is 0%-2 of the mass of the stirred soil.
- the mass proportion of carbon nanotubes in the cement slurry is 0%-0.2%;
- the concentration of 1%-2% ionic surfactant solution is selected, and the mixing quality of ionic surfactant is 2%-4 of the mass of the stirred soil %, the mass proportion of carbon nanotubes in the cement slurry is 0%-0.4%;
- the concentration of 2%-4% ionic surfactant solution is selected, and the mixing quality of ionic surfactant is 4%-6 of the mass of the stirred soil.
- the mass proportion of carbon nanotubes in the cement slurry is 0%-0.6%;
- the concentration of 4%-8% ionic surfactant solution is selected, and the mixing quality of ionic surfactant is 6%-10% of the mass of the stirred soil.
- the mass ratio of nanotubes in the cement slurry is 0%-1%.
- the downward moving speed of the drill rod during the stirring and drilling process is 50-1500 mm/min, and the rotational speed is 5-20 r/min; the upward moving speed of the drill rod during the stirring and lifting process is 100-3000 mm/min, and the rotational speed is 10 -30r/min, the downward movement speed and rotation speed of the drill pipe during the secondary agitation drilling process are 1.2-5 times that of the mixing and drilling process; Times.
- the specific surface area of the carbon nanotubes is greater than 200 m 2 /g.
- the cement in the cement slurry is selected from P.O42.5 ordinary Portland cement, and the carbon nanotubes are first fully mixed with P.O42.5 ordinary Portland cement, and then purified water is added for thorough mixing to form a mixture. Cement slurry with carbon nanotubes.
- Fig. 1 is a process flow diagram of the construction method for realizing large-diameter deep mixing based on the resistance reduction method of the present invention.
- Step 1 Preparation of construction site, configuration and transformation of construction equipment
- a mixing drill bit matching the mixing diameter is set.
- the mixing drill bit is composed of a mixing drill rod, a main mixing blade and a double mixing blade.
- the radius of the main mixing blade and the double mixing blade are consistent with the design mixing diameter;
- the back of the blade is evenly provided with 5 curing material injection ports, and the direction of the curing material injection port is consistent with the outer normal direction of the back of the main stirring blade;
- the radius of the main stirring blade is evenly set with 5 resistance-reducing material injection ports on the lower edge of the front of the main stirring blade.
- the direction of the spraying port of the barrier material is perpendicular to the lower edge of the main stirring blade and is inclined upward along the surface of the main stirring blade; connect the configured mixing bit and the connecting drill rod through threads, and then connect the mixing bit and the connecting drill rod as a whole with the mixing drill through the flange connection;
- Step 2 Configuration of resistance reducing material and curing material
- the resistance-reducing material is an ionic surfactant solution
- the curing material is a cement slurry mixed with carbon nanotubes; among them, the mixing mass of the ionic surfactant is 2% of the mass of the stirred soil, and the concentration of the ionic surfactant solution
- the carbon nanotube length range is 10 microns
- the outer wall diameter range is 5 microns
- the mass proportion of carbon nanotubes in the cement slurry is 0.2%
- the water-cement ratio of the cement slurry is 1.2;
- Step 3 Mix and drill down construction
- the ionic surfactant solution is continuously sprayed through the resistance-reducing material spray port, and the spray pressure is 10MPa;
- Step 4 Mixing and lifting construction
- the cement slurry mixed with carbon nanotubes is continuously sprayed through the curing material injection port, the spray pressure is 5MPa, and the spray volume of the slurry during the drilling process is 70% of the total slurry spray volume;
- Step 5 Drilling and construction under secondary mixing
- Step 6 Secondary mixing and drilling construction
- the cement slurry mixed with carbon nanotubes is continuously sprayed through the curing material injection port, the injection pressure is 10MPa, and the slurry injection volume during the secondary drilling process is 30% of the total slurry injection volume;
- Step 7 When the mixing bit is raised to the design height, the mixing operation is completed and the construction is over.
- the downward moving speed of the drill rod during the mixing and drilling process is 600 mm/min, and the rotating speed is 10 r/min; the upward moving speed of the drill rod during the mixing and lifting process is 1000 mm/min, and the rotating speed is 20 r/min.
- the downward moving speed and rotation speed of the drill pipe for drilling down construction are twice that of the mixing and drilling process, and the upward moving speed and rotation speed of the drilling rod for the secondary mixing and lifting construction are two times that of the mixing and lifting process.
- the specific surface area of the carbon nanotubes is greater than 200 m 2 /g.
- the cement in the cement slurry is selected from P.O42.5 ordinary Portland cement, and the carbon nanotubes are first fully mixed with P.O42.5 ordinary Portland cement, and then purified water is added for thorough mixing to form a mixture. Cement slurry with carbon nanotubes.
- Step 1 Preparation of construction site, configuration and transformation of construction equipment
- a mixing drill bit matching the mixing diameter is set.
- the mixing drill bit is composed of a mixing drill rod, a main mixing blade and a double mixing blade.
- the radius of the main mixing blade and the double mixing blade are consistent with the design mixing diameter;
- the back of the blade is evenly provided with 5 curing material injection ports, and the direction of the curing material injection port is consistent with the outer normal direction of the back of the main stirring blade;
- the radius of the main stirring blade is evenly set with 5 resistance-reducing material injection ports on the lower edge of the front of the main stirring blade.
- the direction of the spraying port of the barrier material is perpendicular to the lower edge of the main stirring blade and is inclined upward along the surface of the main stirring blade; connect the configured mixing bit and the connecting drill rod through threads, and then connect the mixing bit and the connecting drill rod as a whole with the mixing drill through the flange connection;
- Step 2 Configuration of resistance reducing material and curing material
- the resistance-reducing material is an ionic surfactant solution
- the curing material is a cement slurry mixed with carbon nanotubes; among them, the mixing mass of the ionic surfactant is 5% of the mass of the stirred soil, and the concentration of the ionic surfactant solution The range is 3%; the length of the carbon nanotubes is 10 microns, the diameter of the outer wall is 7 microns, the mass ratio of carbon nanotubes in the cement slurry is 0.5%, and the water-cement ratio of the cement slurry is 1.5;
- Step 3 Mix and drill down construction
- the ionic surfactant solution is continuously sprayed through the resistance-reducing material spray port, and the spray pressure is 10MPa;
- Step 4 Mixing and lifting construction
- the cement slurry mixed with carbon nanotubes is continuously sprayed through the curing material injection port, the spray pressure is 20MPa, and the spray volume of the slurry during the drilling process is 70% of the total slurry spray volume;
- Step 5 Drilling and construction under secondary mixing
- Step 6 Secondary mixing and drilling construction
- the cement slurry mixed with carbon nanotubes is continuously sprayed through the curing material injection port, the injection pressure is 15MPa, and the slurry injection volume during the second drilling process is 30% of the total slurry injection volume;
- Step 7 When the mixing bit is raised to the design height, the mixing operation is completed and the construction is over.
- the downward moving speed of the drill rod during the mixing and drilling process is 900 mm/min, and the rotating speed is 20r/min; the upward moving speed of the drill rod during the mixing and lifting process is 2000 mm/min, and the rotating speed is 30r/min, and the secondary stirring
- the downward moving speed and rotation speed of the drill pipe for drilling down construction are 1.5 times that of the mixing and drilling process, and the upward moving speed and rotation speed of the construction drill pipe for secondary mixing and lifting is 1.5 times that of the mixing and lifting process.
- the specific surface area of the carbon nanotubes is greater than 200 m 2 /g.
- the cement in the cement slurry is selected from P.O42.5 ordinary Portland cement, and the carbon nanotubes are first fully mixed with P.O42.5 ordinary Portland cement, and then purified water is added for thorough mixing to form a mixture. Cement slurry with carbon nanotubes.
- the present invention is based on the construction method of large-diameter deep mixing based on the drag reduction method.
- a new type of drill bit is manufactured to achieve the function of reducing resistance; the resistance of the stirring blade is reduced by spraying the ionic surfactant solution; Incorporating carbon nanotubes into the cement slurry to form a new type of solidified material is conducive to the full mixing of the slurry and the soil; using different construction parameters under different geological conditions, targeted construction, improving construction efficiency and ensuring the quality of the mixing pile .
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Abstract
Provided is a construction method for achieving large-diameter deep mixing on the basis of resistance reduction, belonging to the technical field of pile foundation construction, organically combining a resistance reduction material with a mixing drilling rig, and using the following steps to implement a large-diameter deep construction method: construction site preparation, and configuration and refitting of construction equipment; configuration of resistance reduction material and curing material; mixing and drill lowering construction; mixing and drill raising construction; secondary mixing and drill lowering construction; secondary mixing and drill raising construction; when the mixing drill bit is raised to a design height, completing the mixing operation, ending the construction. The present invention improves the structure of a traditional drill bit to achieve the function of resistance reduction; reducing the resistance of the stirring blade by means of spraying an ionic surfactant solution; carbon nanotubes are doped in a cement slurry to form a new type of curing material, conducive to the full mixing of slurry and soil; different construction parameters are used under different geological conditions, and construction is targeted, improving construction efficiency and ensuring the quality of the mixing pile.
Description
本发明涉及桩基施工技术领域，具体涉及到基于降阻方式实现大直径深层搅拌的施工方法。 The invention relates to the technical field of pile foundation construction, in particular to a construction method for realizing large-diameter deep mixing based on a resistance reduction method.
深层搅拌技术自二十世纪七十年代正式应用于工程实践，目前已被广泛应用于工业与民用建筑、地铁、公路、市政、水利、港口航道及海上设施等的建设中。水泥土深层搅拌桩是用于加固软土地基的一种方法，它利用水泥作为固化剂，通过特制的搅拌机械和输浆泵，在地基深处将软土和固化剂强制搅拌混合，利用固化剂和软土之间所产生的一系列物理化学反应，使软土硬结成具有整体性、水稳定性和较高地基承载力的复合地基。Deep mixing technology has been formally used in engineering practice since the 1970s, and has been widely used in the construction of industrial and civil buildings, subways, highways, municipal administration, water conservancy, port waterways and offshore facilities. Cement-soil deep mixing pile is a method used to reinforce soft soil foundation. It uses cement as a curing agent, and through special mixing machinery and slurry pump, the soft soil and curing agent are forced to mix and mix in the depth of the foundation. A series of physical and chemical reactions between the agent and the soft soil harden the soft soil into a composite foundation with integrity, water stability and high foundation bearing capacity.
随着深层搅拌技术的广泛应用，搅拌桩的设计深度越来越深，导致钻机钻进时上覆荷载较大，同时下部叶片所受阻力较大，从而降低工程施工效率。常规搅拌钻头的喷浆口设置在钻杆上，在深层搅拌时由于压力较大，浆液很难达到搅拌桩边缘，导致成桩质量差。虽然采用喷口设置在搅拌叶片的底部方式进行改进，当搅拌轴提升回转时，在上搅叶片底部就会产生一定的空隙，则改良材料用压缩空气经搅拌轴从上搅拌叶片根部喷到该空隙中去。这种喷口设置方式在一定程度上解决了该问题。但由于叶片底部的空隙范围较小且土对空隙的填充速度较快，导致其发挥的作用有限。With the widespread application of deep mixing technology, the design depth of mixing piles is getting deeper and deeper, resulting in a larger overburden load when drilling rigs, and greater resistance on the lower blades, thereby reducing engineering construction efficiency. The grout port of the conventional mixing drill bit is set on the drill pipe. Due to the high pressure during deep mixing, it is difficult for the slurry to reach the edge of the mixing pile, resulting in poor pile quality. Although the nozzle is set at the bottom of the mixing blade for improvement, when the mixing shaft is lifted and rotated, a certain gap will be generated at the bottom of the upper mixing blade. The improved material is sprayed from the root of the upper mixing blade through the mixing shaft to the gap. Go in. This nozzle arrangement method solves this problem to a certain extent. However, due to the small gap at the bottom of the blade and the faster filling rate of the gap with soil, its role is limited.
因此，阻力过大成为了制约大直径深层搅拌桩发展的突出问题，如何降低深层搅拌时钻头所受的阻力，成为亟待解决的问题。基于此，本发明提出了基于降阻方式实现大直径深层搅拌的施工方法。Therefore, excessive resistance has become a prominent problem restricting the development of large-diameter deep mixing piles. How to reduce the resistance of the drill bit during deep mixing has become an urgent problem to be solved. Based on this, the present invention proposes a construction method for realizing large-diameter deep mixing based on a resistance reduction method.
针对现有技术中存在的上述技术问题，本发明提出了基于降阻方式实现大直径深层搅拌的施工方法，克服了现有技术的不足。通过改进传统钻头的结构形式，制造出新型钻头，以达到降低阻力的功能；通过喷射离子型表面活性剂溶液降低搅拌叶片的阻力；通过在水泥浆内掺入碳纳米管，形成新型固化材料，有利于浆液与土体的充分混合；在不同地质条件下采用不同的施工参数，有针对性的施工，提高施工效率，保证搅拌桩质量。In view of the above technical problems in the prior art, the present invention proposes a construction method for realizing large-diameter deep mixing based on a resistance reduction method, which overcomes the deficiencies of the prior art. By improving the structure of the traditional drill bit, a new type of drill bit is manufactured to achieve the function of reducing resistance; by spraying ionic surfactant solution to reduce the resistance of the stirring blade; by mixing carbon nanotubes in the cement slurry to form a new type of solidified material, It is conducive to the full mixing of slurry and soil; different construction parameters are used under different geological conditions, targeted construction, construction efficiency is improved, and the quality of the mixing pile is guaranteed.
为了实现上述目的，本发明采用如下技术方案：In order to achieve the above objectives, the present invention adopts the following technical solutions:
基于降阻方式实现大直径深层搅拌的施工方法，其特征在于，通过将降阻材料与搅拌钻机有机结合，采用如下步骤实现大直径深层的施工方法：The construction method for realizing large-diameter deep mixing based on the resistance reduction method is characterized by organically combining the resistance-reducing material with the mixing drill and adopting the following steps to realize the large-diameter deep construction method:
步骤1：施工场地准备，施工设备配置及改造；Step 1: Preparation of construction site, configuration and transformation of construction equipment;
根据搅拌设计方案，设置与搅拌直径相匹配的搅拌钻头，搅拌钻头由搅拌钻杆、主搅叶片和复搅叶片而成，主搅叶片和复搅叶片半径与设计搅拌直径保持一致；在主搅叶片背部均匀设置1-10个固化材料喷射口，固化材料喷射口方向与主搅叶片背部外法线方向保持一致；主搅叶片半径在主搅叶片前部下边缘均匀设置1-10个降阻材料喷射口，降阻材料喷射口方向与主搅叶片下边缘垂直且沿主搅叶片表面倾斜向上；将配置好的搅拌钻头与连接钻杆通过螺纹连接，然后将搅拌钻头和连接钻杆整体与搅拌钻机通过法兰连接；According to the mixing design plan, a mixing drill bit matching the mixing diameter is set. The mixing drill bit is composed of a mixing drill rod, a main mixing blade and a double mixing blade. The radius of the main mixing blade and the double mixing blade are consistent with the design mixing diameter; 1-10 solidified material injection ports are uniformly arranged on the back of the blade, and the direction of the solidified material injection port is consistent with the outer normal direction of the back of the main stirring blade; the radius of the main stirring blade is evenly set with 1-10 resistance reducing materials on the lower edge of the front part of the main stirring blade Spray port, the direction of the spray port of the resistance-reducing material is perpendicular to the lower edge of the main stirring blade and is inclined upward along the surface of the main stirring blade; connect the configured stirring bit and the connecting drill rod through the thread, and then combine the stirring bit and the connecting drill rod as a whole The drilling rig is connected by flanges;
步骤2：降阻材料与固化材料配置；Step 2: Configuration of resistance reducing material and curing material;
降阻材料选用离子型表面活性剂溶液，固化材料选用掺有碳纳米管的水泥浆液；其中，离子型表面活性剂的掺入质量为搅拌土体质量的0%-10%，离子型表面活性剂溶液浓度范围为0%-8%；碳纳米管长度范围为2-20微米，外壁直径范围为2-20微米，碳纳米管在水泥浆液中的质量占比为0%-1%，水泥浆液的水灰比为1-2；The resistance-reducing material is an ionic surfactant solution, and the curing material is a cement slurry mixed with carbon nanotubes; among them, the mixing mass of the ionic surfactant is 0%-10% of the mass of the stirred soil, and the ionic surface is active The concentration range of the agent solution is 0%-8%; the length of the carbon nanotubes is 2-20 microns, the outer wall diameter is 2-20 microns, and the mass ratio of carbon nanotubes in the cement slurry is 0%-1%. The water-cement ratio of the slurry is 1-2;
步骤3：搅拌下钻施工；Step 3: Mix and drill down construction;
搅拌下钻过程中通过降阻材料喷射口连续性地喷射离子型表面活性剂溶液，喷射压力为0.5-20MPa；During the stirring and drilling process, the ionic surfactant solution is continuously sprayed through the resistance-reducing material spray port, and the spray pressure is 0.5-20MPa;
步骤4：搅拌提钻施工；Step 4: Mixing and lifting construction;
搅拌提钻过程中通过固化材料喷射口连续性地喷射掺有碳纳米管的水泥浆液，喷射压力为0.5-20MPa，提钻过程中浆液的喷射量为总浆液喷射量的60%-80%；During the agitating drilling process, the cement slurry mixed with carbon nanotubes is continuously sprayed through the curing material injection port, the spraying pressure is 0.5-20MPa, and the spraying volume of the slurry during the drilling lifting process is 60%-80% of the total slurry spraying volume;
步骤5：二次搅拌下钻施工；Step 5: Drilling and construction under secondary mixing;
二次搅拌下钻过程中仅开展搅拌作业，不喷射任何材料；During the secondary mixing and drilling process, only mixing operation is carried out, and no material is sprayed;
步骤6：二次搅拌提钻施工；Step 6: Secondary mixing and drilling construction;
二次搅拌提钻过程中通过固化材料喷射口连续性地喷射掺有碳纳米管的水泥浆液，喷射压力为0.5-20MPa，二次提钻过程中浆液的喷射量为总浆液喷射量的20%-40%；During the secondary agitating drilling process, the cement slurry mixed with carbon nanotubes is continuously sprayed through the curing material injection port. The injection pressure is 0.5-20MPa. The slurry injection volume during the secondary drilling process is 20% of the total slurry injection volume. -40%;
步骤7：搅拌钻头提升至设计高度时，完成搅拌作业，施工结束。Step 7: When the mixing bit is raised to the design height, the mixing operation is completed and the construction is over.
根据施工场地土体的标贯试验指标标贯基数N值动态调整搅喷浆液及旋喷浆液配置方案，具体配置方案如下：According to the standard penetration test index of the construction site soil, the standard penetration base N value is dynamically adjusted to the configuration plan of the mixing and spraying slurry. The specific configuration plan is as follows:
标贯试验指标标贯基数N值范围为0-30时，选用浓度为0%-1%离子型表面活性剂溶液，离子型表面活性剂的掺入质量为搅拌土体质量的0%-2%，碳纳米管在水泥浆液中的质量占比为0％-0.2%；When the standard penetration test index standard penetration base N value range is 0-30, the concentration of 0%-1% ionic surfactant solution is selected, and the mixing quality of ionic surfactant is 0%-2 of the mass of the stirred soil. %, the mass proportion of carbon nanotubes in the cement slurry is 0%-0.2%;
标贯试验指标标贯基数N值范围为30-50时，选用浓度为1%-2%离子型表面活性剂溶液，离子型表面活性剂的掺入质量为搅拌土体质量的2%-4%，碳纳米管在水泥浆液中的质量占比为0％-0.4%；When the standard penetration test index standard penetration base N value range is 30-50, the concentration of 1%-2% ionic surfactant solution is selected, and the mixing quality of ionic surfactant is 2%-4 of the mass of the stirred soil %, the mass proportion of carbon nanotubes in the cement slurry is 0%-0.4%;
标贯试验指标标贯基数N值范围为50-80时，选用浓度为2%-4%离子型表面活性剂溶液，离子型表面活性剂的掺入质量为搅拌土体质量的4%-6%，碳纳米管在水泥浆液中的质量占比为0％-0.6%；When the standard penetration test index standard penetration base N value range is 50-80, the concentration of 2%-4% ionic surfactant solution is selected, and the mixing quality of ionic surfactant is 4%-6 of the mass of the stirred soil. %, the mass proportion of carbon nanotubes in the cement slurry is 0%-0.6%;
标贯试验指标标贯基数N值大于80时，选用浓度为4%-8%离子型表面活性剂溶液，离子型表面活性剂的掺入质量为搅拌土体质量的6%-10%，碳纳米管在水泥浆液中的质量占比为0％-1%。When the N value of the standard penetration test index is greater than 80, the concentration of 4%-8% ionic surfactant solution is selected, and the mixing quality of ionic surfactant is 6%-10% of the mass of the stirred soil. The mass ratio of nanotubes in the cement slurry is 0%-1%.
优选地，所述搅拌下钻过程中钻杆向下移动速度为50-1500mm/min，转速为5-20r/min；搅拌提升过程中钻杆向上移动速度为100-3000mm/min，转速为10-30r/min，二次搅拌下钻施工钻杆向下移动速度及转速为搅拌下钻过程的1.2-5倍，二次搅拌提升施工钻杆向上移动速度及转速为搅拌提升过程的1.2-5倍。Preferably, the downward moving speed of the drill rod during the stirring and drilling process is 50-1500 mm/min, and the rotational speed is 5-20 r/min; the upward moving speed of the drill rod during the stirring and lifting process is 100-3000 mm/min, and the rotational speed is 10 -30r/min, the downward movement speed and rotation speed of the drill pipe during the secondary agitation drilling process are 1.2-5 times that of the mixing and drilling process; Times.
优选地，所述碳纳米管的比表面积大于200m
2 /g。
Preferably, the specific surface area of the carbon nanotubes is greater than 200 m 2 /g.
优选地，所述水泥浆液中的水泥选用P.O42.5普通硅酸盐水泥，碳纳米管先与P.O42.5普通硅酸盐水泥充分混合后，再加入纯净水进行充分搅拌形成掺有碳纳米管的水泥浆液。Preferably, the cement in the cement slurry is selected from P.O42.5 ordinary Portland cement, and the carbon nanotubes are first fully mixed with P.O42.5 ordinary Portland cement, and then purified water is added for thorough mixing to form a mixture. Cement slurry with carbon nanotubes.
本发明所带来的有益技术效果：The beneficial technical effects brought by the present invention:
（1）通过改进传统钻头的结构形式，制造出新型钻头，以达到降低阻力的功能；（2）通过喷射离子型表面活性剂溶液，降低搅拌叶片的阻力；（3）通过在水泥浆内掺入碳纳米管，形成新型固化材料，有利于浆液与土体的充分混合；（4）在不同地质条件下采用不同的施工参数，有针对性的施工，提高施工效率，保证搅拌桩质量，达到因地制宜的目的。(1) By improving the structure of traditional drill bits, a new type of drill bit can be manufactured to reduce resistance; (2) By spraying ionic surfactant solution to reduce the resistance of the stirring blade; (3) By mixing cement slurry Into carbon nanotubes to form a new type of solidified material, which is conducive to the full mixing of slurry and soil; (4) Using different construction parameters under different geological conditions, targeted construction, improving construction efficiency, ensuring the quality of the mixing pile, and achieving The purpose of adapting measures to local conditions.
图1为本发明基于降阻方式实现大直径深层搅拌的施工方法的工艺流程图。Fig. 1 is a process flow diagram of the construction method for realizing large-diameter deep mixing based on the resistance reduction method of the present invention.
下面结合附图以及具体实施方式对本发明作进一步详细说明：The present invention will be further described in detail below in conjunction with the drawings and specific embodiments:
实施例1：Example 1:
采用本发明的施工方法，在场地地质条件的标贯试验指标标贯基数N值为20时，按照如下步骤进行：Using the construction method of the present invention, when the benchmark penetration test index N value of the site geological conditions is 20, the following steps are performed:
基于降阻方式实现大直径深层搅拌的施工方法，其特征在于，通过将降阻材料与搅拌钻机有机结合，采用如下步骤实现大直径深层的施工方法：The construction method for realizing large-diameter deep mixing based on the resistance reduction method is characterized by organically combining the resistance-reducing material with the mixing drill and adopting the following steps to realize the large-diameter deep construction method:
步骤1：施工场地准备，施工设备配置及改造；Step 1: Preparation of construction site, configuration and transformation of construction equipment;
根据搅拌设计方案，设置与搅拌直径相匹配的搅拌钻头，搅拌钻头由搅拌钻杆、主搅叶片和复搅叶片而成，主搅叶片和复搅叶片半径与设计搅拌直径保持一致；在主搅叶片背部均匀设置5个固化材料喷射口，固化材料喷射口方向与主搅叶片背部外法线方向保持一致；主搅叶片半径在主搅叶片前部下边缘均匀设置5个降阻材料喷射口，降阻材料喷射口方向与主搅叶片下边缘垂直且沿主搅叶片表面倾斜向上；将配置好的搅拌钻头与连接钻杆通过螺纹连接，然后将搅拌钻头和连接钻杆整体与搅拌钻机通过法兰连接；According to the mixing design plan, a mixing drill bit matching the mixing diameter is set. The mixing drill bit is composed of a mixing drill rod, a main mixing blade and a double mixing blade. The radius of the main mixing blade and the double mixing blade are consistent with the design mixing diameter; The back of the blade is evenly provided with 5 curing material injection ports, and the direction of the curing material injection port is consistent with the outer normal direction of the back of the main stirring blade; the radius of the main stirring blade is evenly set with 5 resistance-reducing material injection ports on the lower edge of the front of the main stirring blade. The direction of the spraying port of the barrier material is perpendicular to the lower edge of the main stirring blade and is inclined upward along the surface of the main stirring blade; connect the configured mixing bit and the connecting drill rod through threads, and then connect the mixing bit and the connecting drill rod as a whole with the mixing drill through the flange connection;
步骤2：降阻材料与固化材料配置；Step 2: Configuration of resistance reducing material and curing material;
降阻材料选用离子型表面活性剂溶液，固化材料选用掺有碳纳米管的水泥浆液；其中，离子型表面活性剂的掺入质量为搅拌土体质量的2%，离子型表面活性剂溶液浓度为1%；碳纳米管长度范围为10微米，外壁直径范围为5微米，碳纳米管在水泥浆液中的质量占比为0.2%，水泥浆液的水灰比为1.2；The resistance-reducing material is an ionic surfactant solution, and the curing material is a cement slurry mixed with carbon nanotubes; among them, the mixing mass of the ionic surfactant is 2% of the mass of the stirred soil, and the concentration of the ionic surfactant solution The carbon nanotube length range is 10 microns, the outer wall diameter range is 5 microns, the mass proportion of carbon nanotubes in the cement slurry is 0.2%, and the water-cement ratio of the cement slurry is 1.2;
步骤3：搅拌下钻施工；Step 3: Mix and drill down construction;
搅拌下钻过程中通过降阻材料喷射口连续性地喷射离子型表面活性剂溶液，喷射压力为10MPa；During the stirring and drilling process, the ionic surfactant solution is continuously sprayed through the resistance-reducing material spray port, and the spray pressure is 10MPa;
步骤4：搅拌提钻施工；Step 4: Mixing and lifting construction;
搅拌提钻过程中通过固化材料喷射口连续性地喷射掺有碳纳米管的水泥浆液，喷射压力为5MPa，提钻过程中浆液的喷射量为总浆液喷射量的70%；During the agitating and lifting process, the cement slurry mixed with carbon nanotubes is continuously sprayed through the curing material injection port, the spray pressure is 5MPa, and the spray volume of the slurry during the drilling process is 70% of the total slurry spray volume;
步骤5：二次搅拌下钻施工；Step 5: Drilling and construction under secondary mixing;
二次搅拌下钻过程中仅开展搅拌作业，不喷射任何材料；During the secondary mixing and drilling process, only mixing operation is carried out, and no material is sprayed;
步骤6：二次搅拌提钻施工；Step 6: Secondary mixing and drilling construction;
二次搅拌提钻过程中通过固化材料喷射口连续性地喷射掺有碳纳米管的水泥浆液，喷射压力为10MPa，二次提钻过程中浆液的喷射量为总浆液喷射量的30%；During the secondary agitating drilling process, the cement slurry mixed with carbon nanotubes is continuously sprayed through the curing material injection port, the injection pressure is 10MPa, and the slurry injection volume during the secondary drilling process is 30% of the total slurry injection volume;
步骤7：搅拌钻头提升至设计高度时，完成搅拌作业，施工结束。Step 7: When the mixing bit is raised to the design height, the mixing operation is completed and the construction is over.
优选地，所述搅拌下钻过程中钻杆向下移动速度为600mm/min，转速为10r/min；搅拌提升过程中钻杆向上移动速度为1000mm/min，转速为20r/min，二次搅拌下钻施工钻杆向下移动速度及转速为搅拌下钻过程的2倍，二次搅拌提升施工钻杆向上移动速度及转速为搅拌提升过程的2倍。Preferably, the downward moving speed of the drill rod during the mixing and drilling process is 600 mm/min, and the rotating speed is 10 r/min; the upward moving speed of the drill rod during the mixing and lifting process is 1000 mm/min, and the rotating speed is 20 r/min. The downward moving speed and rotation speed of the drill pipe for drilling down construction are twice that of the mixing and drilling process, and the upward moving speed and rotation speed of the drilling rod for the secondary mixing and lifting construction are two times that of the mixing and lifting process.
优选地，所述碳纳米管的比表面积大于200m
2 /g。
Preferably, the specific surface area of the carbon nanotubes is greater than 200 m 2 /g.
优选地，所述水泥浆液中的水泥选用P.O42.5普通硅酸盐水泥，碳纳米管先与P.O42.5普通硅酸盐水泥充分混合后，再加入纯净水进行充分搅拌形成掺有碳纳米管的水泥浆液。Preferably, the cement in the cement slurry is selected from P.O42.5 ordinary Portland cement, and the carbon nanotubes are first fully mixed with P.O42.5 ordinary Portland cement, and then purified water is added for thorough mixing to form a mixture. Cement slurry with carbon nanotubes.
实施例2：Example 2:
采用本发明的施工方法，在场地地质条件的标贯试验指标标贯基数N值为60时，按照如下步骤进行：Using the construction method of the present invention, when the standard penetration test index N value of the site geological conditions is 60, the following steps are performed:
基于降阻方式实现大直径深层搅拌的施工方法，其特征在于，通过将降阻材料与搅拌钻机有机结合，采用如下步骤实现大直径深层的施工方法：The construction method for realizing large-diameter deep mixing based on the resistance reduction method is characterized by organically combining the resistance-reducing material with the mixing drill and adopting the following steps to realize the large-diameter deep construction method:
基于降阻方式实现大直径深层搅拌的施工方法，其特征在于，通过将降阻材料与搅拌钻机有机结合，采用如下步骤实现大直径深层的施工方法：The construction method for realizing large-diameter deep mixing based on the resistance reduction method is characterized by organically combining the resistance-reducing material with the mixing drill and adopting the following steps to realize the large-diameter deep construction method:
步骤1：施工场地准备，施工设备配置及改造；Step 1: Preparation of construction site, configuration and transformation of construction equipment;
根据搅拌设计方案，设置与搅拌直径相匹配的搅拌钻头，搅拌钻头由搅拌钻杆、主搅叶片和复搅叶片而成，主搅叶片和复搅叶片半径与设计搅拌直径保持一致；在主搅叶片背部均匀设置5个固化材料喷射口，固化材料喷射口方向与主搅叶片背部外法线方向保持一致；主搅叶片半径在主搅叶片前部下边缘均匀设置5个降阻材料喷射口，降阻材料喷射口方向与主搅叶片下边缘垂直且沿主搅叶片表面倾斜向上；将配置好的搅拌钻头与连接钻杆通过螺纹连接，然后将搅拌钻头和连接钻杆整体与搅拌钻机通过法兰连接；According to the mixing design plan, a mixing drill bit matching the mixing diameter is set. The mixing drill bit is composed of a mixing drill rod, a main mixing blade and a double mixing blade. The radius of the main mixing blade and the double mixing blade are consistent with the design mixing diameter; The back of the blade is evenly provided with 5 curing material injection ports, and the direction of the curing material injection port is consistent with the outer normal direction of the back of the main stirring blade; the radius of the main stirring blade is evenly set with 5 resistance-reducing material injection ports on the lower edge of the front of the main stirring blade. The direction of the spraying port of the barrier material is perpendicular to the lower edge of the main stirring blade and is inclined upward along the surface of the main stirring blade; connect the configured mixing bit and the connecting drill rod through threads, and then connect the mixing bit and the connecting drill rod as a whole with the mixing drill through the flange connection;
步骤2：降阻材料与固化材料配置；Step 2: Configuration of resistance reducing material and curing material;
降阻材料选用离子型表面活性剂溶液，固化材料选用掺有碳纳米管的水泥浆液；其中，离子型表面活性剂的掺入质量为搅拌土体质量的5%，离子型表面活性剂溶液浓度范围为3%；碳纳米管长度范围为10微米，外壁直径范围为7微米，碳纳米管在水泥浆液中的质量占比为0.5%，水泥浆液的水灰比为1.5；The resistance-reducing material is an ionic surfactant solution, and the curing material is a cement slurry mixed with carbon nanotubes; among them, the mixing mass of the ionic surfactant is 5% of the mass of the stirred soil, and the concentration of the ionic surfactant solution The range is 3%; the length of the carbon nanotubes is 10 microns, the diameter of the outer wall is 7 microns, the mass ratio of carbon nanotubes in the cement slurry is 0.5%, and the water-cement ratio of the cement slurry is 1.5;
步骤3：搅拌下钻施工；Step 3: Mix and drill down construction;
搅拌下钻过程中通过降阻材料喷射口连续性地喷射离子型表面活性剂溶液，喷射压力为10MPa；During the stirring and drilling process, the ionic surfactant solution is continuously sprayed through the resistance-reducing material spray port, and the spray pressure is 10MPa;
步骤4：搅拌提钻施工；Step 4: Mixing and lifting construction;
搅拌提钻过程中通过固化材料喷射口连续性地喷射掺有碳纳米管的水泥浆液，喷射压力为20MPa，提钻过程中浆液的喷射量为总浆液喷射量的70%；During the agitating and lifting process, the cement slurry mixed with carbon nanotubes is continuously sprayed through the curing material injection port, the spray pressure is 20MPa, and the spray volume of the slurry during the drilling process is 70% of the total slurry spray volume;
步骤5：二次搅拌下钻施工；Step 5: Drilling and construction under secondary mixing;
二次搅拌下钻过程中仅开展搅拌作业，不喷射任何材料；During the secondary mixing and drilling process, only mixing operation is carried out, and no material is sprayed;
步骤6：二次搅拌提钻施工；Step 6: Secondary mixing and drilling construction;
二次搅拌提钻过程中通过固化材料喷射口连续性地喷射掺有碳纳米管的水泥浆液，喷射压力为15MPa，二次提钻过程中浆液的喷射量为总浆液喷射量的30%；During the second agitating drilling process, the cement slurry mixed with carbon nanotubes is continuously sprayed through the curing material injection port, the injection pressure is 15MPa, and the slurry injection volume during the second drilling process is 30% of the total slurry injection volume;
步骤7：搅拌钻头提升至设计高度时，完成搅拌作业，施工结束。Step 7: When the mixing bit is raised to the design height, the mixing operation is completed and the construction is over.
优选地，所述搅拌下钻过程中钻杆向下移动速度为900mm/min，转速为20r/min；搅拌提升过程中钻杆向上移动速度为2000mm/min，转速为30r/min，二次搅拌下钻施工钻杆向下移动速度及转速为搅拌下钻过程的1. 5倍，二次搅拌提升施工钻杆向上移动速度及转速为搅拌提升过程的1.5倍。Preferably, the downward moving speed of the drill rod during the mixing and drilling process is 900 mm/min, and the rotating speed is 20r/min; the upward moving speed of the drill rod during the mixing and lifting process is 2000 mm/min, and the rotating speed is 30r/min, and the secondary stirring The downward moving speed and rotation speed of the drill pipe for drilling down construction are 1.5 times that of the mixing and drilling process, and the upward moving speed and rotation speed of the construction drill pipe for secondary mixing and lifting is 1.5 times that of the mixing and lifting process.
优选地，所述碳纳米管的比表面积大于200m
2/g。
Preferably, the specific surface area of the carbon nanotubes is greater than 200 m 2 /g.
优选地，所述水泥浆液中的水泥选用P.O42.5普通硅酸盐水泥，碳纳米管先与P.O42.5普通硅酸盐水泥充分混合后，再加入纯净水进行充分搅拌形成掺有碳纳米管的水泥浆液。Preferably, the cement in the cement slurry is selected from P.O42.5 ordinary Portland cement, and the carbon nanotubes are first fully mixed with P.O42.5 ordinary Portland cement, and then purified water is added for thorough mixing to form a mixture. Cement slurry with carbon nanotubes.
本发明基于降阻方式实现大直径深层搅拌的施工方法，通过改进传统钻头的结构形式，制造出新型钻头，以达到降低阻力的功能；通过喷射离子型表面活性剂溶液降低搅拌叶片的阻力；通过在水泥浆内掺入碳纳米管，形成新型固化材料，有利于浆液与土体的充分混合；在不同地质条件下采用不同的施工参数，有针对性的施工，提高施工效率，保证搅拌桩质量。The present invention is based on the construction method of large-diameter deep mixing based on the drag reduction method. By improving the structure of the traditional drill bit, a new type of drill bit is manufactured to achieve the function of reducing resistance; the resistance of the stirring blade is reduced by spraying the ionic surfactant solution; Incorporating carbon nanotubes into the cement slurry to form a new type of solidified material is conducive to the full mixing of the slurry and the soil; using different construction parameters under different geological conditions, targeted construction, improving construction efficiency and ensuring the quality of the mixing pile .
当然，上述说明并非是对本发明的限制，本发明也并不仅限于上述举例，本技术领域的技术人员在本发明的实质范围内所做出的变化、改型、添加或替换，也属于本发明的保护范围。Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by those skilled in the art within the essential scope of the present invention also belong to the present invention. The scope of protection.
Claims (5)
- 基于降阻方式实现大直径深层搅拌的施工方法，其特征在于，通过将降阻材料与搅拌钻机有机结合，采用如下步骤实现大直径深层的施工方法：The construction method for realizing large-diameter deep mixing based on the resistance reduction method is characterized by organically combining the resistance-reducing material with the mixing drill and adopting the following steps to realize the large-diameter deep construction method:步骤1：施工场地准备，施工设备配置及改造；Step 1: Preparation of construction site, configuration and transformation of construction equipment;根据搅拌设计方案，设置与搅拌直径相匹配的搅拌钻头，搅拌钻头由搅拌钻杆、主搅叶片和复搅叶片而成，主搅叶片和复搅叶片半径与设计搅拌直径保持一致；在主搅叶片背部均匀设置1-10个固化材料喷射口，固化材料喷射口方向与主搅叶片背部外法线方向保持一致；主搅叶片半径在主搅叶片前部下边缘均匀设置1-10个降阻材料喷射口，降阻材料喷射口方向与主搅叶片下边缘垂直且沿主搅叶片表面倾斜向上；将配置好的搅拌钻头与连接钻杆通过螺纹连接，然后将搅拌钻头和连接钻杆整体与搅拌钻机通过法兰连接；According to the mixing design plan, a mixing drill bit matching the mixing diameter is set. The mixing drill bit is composed of a mixing drill rod, a main mixing blade and a double mixing blade. The radius of the main mixing blade and the double mixing blade are consistent with the design mixing diameter; 1-10 solidified material injection ports are uniformly arranged on the back of the blade, and the direction of the solidified material injection port is consistent with the outer normal direction of the back of the main agitator blade; the radius of the main agitator blade is evenly set with 1-10 resistance-reducing materials Spray port, the direction of the spray port of the resistance-reducing material is perpendicular to the lower edge of the main stirring blade and is inclined upward along the surface of the main stirring blade; connect the configured stirring bit and the connecting drill rod through the thread, and then combine the stirring bit and the connecting drill rod as a whole The drilling rig is connected by flanges;步骤2：降阻材料与固化材料配置；Step 2: Configuration of resistance reducing material and curing material;降阻材料选用离子型表面活性剂溶液，固化材料选用掺有碳纳米管的水泥浆液；其中，离子型表面活性剂的掺入质量为搅拌土体质量的0%-10%，离子型表面活性剂溶液浓度范围为0%-8%；碳纳米管长度范围为2-20微米，外壁直径范围为2-20微米，碳纳米管在水泥浆液中的质量占比为0%-1%，水泥浆液的水灰比为1-2；The resistance-reducing material is an ionic surfactant solution, and the curing material is a cement slurry mixed with carbon nanotubes; among them, the mixing mass of the ionic surfactant is 0%-10% of the mass of the stirred soil, and the ionic surface is active The concentration range of the agent solution is 0%-8%; the length of the carbon nanotubes is 2-20 microns, the outer wall diameter is 2-20 microns, and the mass ratio of carbon nanotubes in the cement slurry is 0%-1%. The water-cement ratio of the slurry is 1-2;步骤3：搅拌下钻施工；Step 3: Mix and drill down construction;搅拌下钻过程中通过降阻材料喷射口连续性地喷射离子型表面活性剂溶液，喷射压力为0.5-20MPa；During the stirring and drilling process, the ionic surfactant solution is continuously sprayed through the resistance-reducing material spray port, and the spray pressure is 0.5-20MPa;步骤4：搅拌提钻施工；Step 4: Mixing and lifting construction;搅拌提钻过程中通过固化材料喷射口连续性地喷射掺有碳纳米管的水泥浆液，喷射压力为0.5-20MPa，提钻过程中浆液的喷射量为总浆液喷射量的60%-80%；During the agitating drilling process, the cement slurry mixed with carbon nanotubes is continuously sprayed through the curing material injection port, the spraying pressure is 0.5-20MPa, and the spraying volume of the slurry during the drilling lifting process is 60%-80% of the total slurry spraying volume;步骤5：二次搅拌下钻施工；Step 5: Drilling and construction under secondary mixing;二次搅拌下钻过程中仅开展搅拌作业，不喷射任何材料；During the secondary mixing and drilling process, only mixing operation is carried out, and no material is sprayed;步骤6：二次搅拌提钻施工；Step 6: Secondary mixing and drilling construction;二次搅拌提钻过程中通过固化材料喷射口连续性地喷射掺有碳纳米管的水泥浆液，喷射压力为0.5-20MPa，二次提钻过程中浆液的喷射量为总浆液喷射量的20%-40%；During the secondary agitating drilling process, the cement slurry mixed with carbon nanotubes is continuously sprayed through the curing material injection port. The injection pressure is 0.5-20MPa. The slurry injection volume during the secondary drilling process is 20% of the total slurry injection volume. -40%;步骤7：搅拌钻头提升至设计高度时，完成搅拌作业，施工结束。Step 7: When the mixing bit is raised to the design height, the mixing operation is completed and the construction is over.
- 根据权利要求1所述的基于降阻方式实现大直径深层搅拌的施工方法，其特征在于，根据施工场地土体的标贯试验指标标贯基数N值动态调整搅喷浆液及旋喷浆液配置方案，具体配置方案如下：The construction method for realizing large-diameter deep mixing based on the resistance reduction method according to claim 1, characterized in that the mixing and spraying slurry and rotary spraying slurry configuration schemes are dynamically adjusted according to the standard penetration test index standard penetration base N value of the construction site soil , The specific configuration scheme is as follows:标贯试验指标标贯基数N值范围为0-30时，选用浓度为0%-1%离子型表面活性剂溶液，离子型表面活性剂的掺入质量为搅拌土体质量的0%-2%，碳纳米管在水泥浆液中的质量占比为0％-0.2%；When the standard penetration test index standard penetration base N value range is 0-30, the concentration of 0%-1% ionic surfactant solution is selected, and the mixing quality of ionic surfactant is 0%-2 of the mass of the stirred soil. %, the mass proportion of carbon nanotubes in the cement slurry is 0%-0.2%;标贯试验指标标贯基数N值范围为30-50时，选用浓度为1%-2%离子型表面活性剂溶液，离子型表面活性剂的掺入质量为搅拌土体质量的2%-4%，碳纳米管在水泥浆液中的质量占比为0％-0.4%；When the standard penetration test index standard penetration base N value range is 30-50, the concentration of 1%-2% ionic surfactant solution is selected, and the mixing quality of ionic surfactant is 2%-4 of the mass of the stirred soil %, the mass proportion of carbon nanotubes in the cement slurry is 0%-0.4%;标贯试验指标标贯基数N值范围为50-80时，选用浓度为2%-4%离子型表面活性剂溶液，离子型表面活性剂的掺入质量为搅拌土体质量的4%-6%，碳纳米管在水泥浆液中的质量占比为0％-0.6%；When the standard penetration test index standard penetration base N value range is 50-80, the concentration of 2%-4% ionic surfactant solution is selected, and the mixing quality of ionic surfactant is 4%-6 of the mass of the stirred soil. %, the mass proportion of carbon nanotubes in the cement slurry is 0%-0.6%;标贯试验指标标贯基数N值大于80时，选用浓度为4%-8%离子型表面活性剂溶液，离子型表面活性剂的掺入质量为搅拌土体质量的6%-10%，碳纳米管在水泥浆液中的质量占比为0％-1%。When the N value of the standard penetration test index is greater than 80, the concentration of 4%-8% ionic surfactant solution is selected, and the mixing quality of ionic surfactant is 6%-10% of the mass of the stirred soil. The mass ratio of nanotubes in the cement slurry is 0%-1%.
- 根据权利要求1所述的基于降阻方式实现大直径深层搅拌的施工方法，其特征在于，所述搅拌下钻过程中钻杆向下移动速度为50-1500mm/min，转速为5-20r/min；搅拌提升过程中钻杆向上移动速度为100-3000mm/min，转速为10-30r/min，二次搅拌下钻施工钻杆向下移动速度及转速为搅拌下钻过程的1.2-5倍，二次搅拌提升施工钻杆向上移动速度及转速为搅拌提升过程的1.2-5倍。The construction method for realizing large-diameter deep mixing based on drag reduction according to claim 1, wherein the downward movement speed of the drill rod during the mixing and drilling process is 50-1500mm/min, and the rotation speed is 5-20r/min. min; During the mixing and lifting process, the upward movement speed of the drill pipe is 100-3000mm/min, and the rotation speed is 10-30r/min. The downward movement speed and rotation speed of the drill pipe during the secondary mixing and drilling construction are 1.2-5 times that of the mixing and drilling process , The upward moving speed and rotation speed of the secondary mixing and lifting construction drill pipe are 1.2-5 times of the mixing and lifting process.
- 根据权利要求1所述的基于降阻方式实现大直径深层搅拌的施工方法，其特征在于，所述碳纳米管的比表面积大于200m 2/g。 The construction method for realizing large-diameter deep mixing based on the resistance reduction method of claim 1, wherein the specific surface area of the carbon nanotubes is greater than 200 m 2 /g.
- 根据权利要求1所述的基于降阻方式实现大直径深层搅拌的施工方法，其特征在于，所述水泥浆液中的水泥选用P.O42.5普通硅酸盐水泥，碳纳米管先与P.O42.5普通硅酸盐水泥充分混合后，再加入纯净水进行充分搅拌形成掺有碳纳米管的水泥浆液。The construction method of implementing large-diameter deep mixing based on the resistance reduction method according to claim 1, wherein the cement in the cement slurry is P.O42.5 ordinary Portland cement, and carbon nanotubes are first combined with P. After the O42.5 ordinary Portland cement is fully mixed, pure water is added and fully stirred to form a cement slurry mixed with carbon nanotubes.
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