WO2022160712A1 - Method for consolidating soft soil foundation by using industrial solid waste as main raw material - Google Patents

Method for consolidating soft soil foundation by using industrial solid waste as main raw material Download PDF

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Publication number
WO2022160712A1
WO2022160712A1 PCT/CN2021/116000 CN2021116000W WO2022160712A1 WO 2022160712 A1 WO2022160712 A1 WO 2022160712A1 CN 2021116000 W CN2021116000 W CN 2021116000W WO 2022160712 A1 WO2022160712 A1 WO 2022160712A1
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soft soil
curing agent
pile
raw material
solid waste
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PCT/CN2021/116000
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French (fr)
Chinese (zh)
Inventor
侯宜峰
吴小刚
谢胜华
秦柯
代永新
朱君星
唐恺
赵蒙生
曾学敏
周玉新
赵骏
Original Assignee
中钢集团马鞍山矿山研究总院股份有限公司
华唯金属矿产资源高效循环利用国家工程研究中心有限公司
中钢集团马鞍山矿院工程勘察设计有限公司
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Publication of WO2022160712A1 publication Critical patent/WO2022160712A1/en

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K17/00—Soil-conditioning materials or soil-stabilising materials
    • C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
    • C09K17/10—Cements, e.g. Portland cement
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02—Improving by compacting
    • E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2103/00—Civil engineering use

Definitions

  • the invention relates to a method for reinforcing a soft soil foundation with industrial solid waste as the main raw material, and belongs to the technical field of soft soil foundation reinforcement.
  • the steel production process also emits a large amount of carbon dioxide, which is also a source of air pollution caused by industrial solid waste in my country. Therefore, using the carbonation reaction between calcium and magnesium components in steel slag and carbon dioxide to produce stable carbonate products can not only fix CO 2 on a large scale, but also change the physical and chemical properties of steel slag. Carbonation of steel slag can not only use the by-product steel slag of the steel plant to fix its by-product waste gas CO 2 , but also can significantly reduce the free oxides in the steel slag (f-CaO can be reduced to less than 1%), promote the utilization of steel slag, and realize waste treatment with waste. , recycling, has important social significance and engineering application research background.
  • the soft soil has the characteristics of large natural water content, large plastic index, large natural void ratio, small weight and low permeability. It has high compressibility and poor strength, and cannot be directly used in engineering construction, foundation treatment, etc. It is necessary to take measures to treat the soft soil to improve the stability of the soft soil subgrade and the load bearing capacity.
  • the purpose of the present invention is to aim at the above-mentioned defects existing in the prior art, and to provide a method for reinforcing soft soil foundation with industrial solid waste as the main raw material, so as to solve the problem that a large amount of cement is used in the treatment of existing soft soil foundation, which cannot meet social demands and Scrap from steel plants is difficult to handle.
  • the present invention is a method for reinforcing soft soil foundation by using industrial solid waste as the main raw material. 27.0%, fly ash 6.0-10.0%, cement 24.0%-35.0%, lime, gypsum or any mixture of the two 2.0-5.0%; industrial solid waste carbonated steel slag, slag powder, fly ash account for soft soil 64.0 to 74.0% of the total amount of curing agent; according to the following process:
  • the pile driver should be positioned accurately according to the designed pile position; the described pile driver adopts the mixing drill, start the mixing drill, and after the drill bit of the mixing drill drills down to the design depth, then rotate the drill bit in the opposite direction to lift the drill bit. While lifting, spray soft soil curing agent slurry into the borehole through the soft soil curing agent slurry sending device.
  • the lifting speed of the drill bit of the mixing rig should not be greater than 0.8m/min; when the drill bit of the mixing drilling rig is lifted to the pile top elevation, turn off the soft soil curing.
  • the agent slurry sending device is used, and the "drilling-lifting, spraying" is recirculated once until the construction of the pile is completed, and then the construction of the next pile is carried out; after the drill bit of the mixing drilling rig is drilled into 0.5 meters, the air compressor is turned on and the compressed air is sprayed. .
  • the design depth must enter the bearing layer ⁇ 0.5m.
  • the soft soil curing agent slurry sending device is a cement sending device in the prior art, and its rotational speed is not less than 50 rpm.
  • the soft soil curing agent slurry should be strictly filtered before sending, and generally two filtration processes are used.
  • the prepared slurry shall not be segregated, and shall not be left for too long (not more than 2h), so as to avoid agglomeration in the slurry and damage to the pump body.
  • the pipeline Before pumping the slurry, the pipeline should be kept moist to facilitate slurry delivery.
  • Sampling and testing Sampling and testing the drill core to check whether the unconfined compressive strength of the pile body meets the requirements of "Technical Regulations for the Reinforcement Method of Mixed Pile on Soft Soil Foundation” (YBJ225-91), that is, the upper middle,
  • the average value of the unconfined compressive strength of the lower part 28d is not less than 0.8MPa, and the minimum value is not less than 1/3 of the design strength.
  • the mass percentage content of each component in the soft soil curing agent raw material is preferably: carbonated steel slag 36.0%-41.0%, slag powder 23.0%-26.0%, fly ash 7.0-9.0%, cement 24.0%-31.0% %, lime, gypsum or a mixture of the two in any proportion of 3.0-4.0%; wherein industrial solid waste carbonated steel slag, slag powder and fly ash account for 66.0-73.0% of the total soft soil curing agent.
  • the carbonation steel slag needs to control the particle size, and the particle size is preferably below 2mm, and the finer the effect, the better the effect. Generally, the particle size below 1mm accounts for more than 80% of the mass.
  • the mass proportion of materials with a particle size of ⁇ 1 mm is ⁇ 80%; the cement is ordinary Portland cement of ⁇ 42.5 grade.
  • step (3) the drill bit of the stirring drilling rig is drilled down to at least 0.5m of the bearing layer, and the rotational speed of the soft soil curing agent slurry sending device is not less than 50 rpm.
  • a method for reinforcing soft soil foundation with industrial solid waste as the main raw material of the present invention has the following beneficial effects:
  • Carbonated steel slag is used for soft soil foundation reinforcement for the first time. Carbonated steel slag is a stable carbonate product with low free oxide content and good stability;
  • the present invention has no vibration, no noise and no pollution to the environment during construction;
  • the soft soil solidifying agent slurry is sprayed into the depth of the soft soil foundation through a stirring drilling rig, so that a series of physical and chemical reactions are produced between the components in the soft soil solidifying agent slurry sprayed into the soft soil and the soft soil. reaction and synergistic effect, thereby significantly improving the strength of the reinforced soft soil foundation.
  • the mass percentage content of each component in the soft soil curing agent raw material used in the present invention is: carbonated steel slag 35.0%-42.0%, slag powder 22.0%-27.0%, fly ash 6.0-10.0%, cement 24.0%-35.0% %, lime, gypsum or a mixture of the two in any proportion of 2.0 to 5.0%.
  • the carbonation steel slag needs to control the particle size, the particle size is preferably below 2mm, and the finer the effect, the better the cement is 42.5 grade ordinary Portland cement.
  • the soft soil curing agent is prepared with dry materials, and the soft soil curing agent slurry is prepared according to the water-cement ratio of 0.5.
  • the carbonated steel slag is mainly composed of iron oxides, calcium oxides, desulfurized gypsum, aluminum slag and a small amount of manganese oxides.
  • the method of the present invention is a method for reinforcing soft soil foundation with industrial solid waste as the main raw material and adopts the following techniques and steps to construct:
  • the construction shall be based on the reliable leveling point and control pile position, and the site shall be leveled and set out.
  • the drilling rig shall be accurately positioned according to the designed pile position. Start the mixing drilling rig, start the air compressor after drilling 0.5 meters, spray compressed air, and drill to the design depth. Note that it is necessary to enter the bearing layer 0.5m, lift the drill to the designed reinforcement depth, rotate in reverse, spray soft soil curing agent slurry while lifting, the lifting speed of the drill should not be greater than 0.8m/min, and the speed of the cement sending device should not be less than 50 rpm /Minute;
  • the soft soil curing agent slurry should be strictly filtered, and two filtering devices should be set up according to the diameter of the nozzle.
  • the prepared slurry shall not be segregated, and shall not be left for too long (not more than 2h), so as to avoid agglomeration in the slurry and damage to the pump body.
  • the pipeline Before pumping the slurry, the pipeline should be kept moist to facilitate slurry delivery.
  • Table 1 shows the proportions of each embodiment of the soft soil curing agent used in the method of the present invention
  • Table 2 shows the unconfined compressive strength (MPa) results of the middle and lower 28d of the pile body of each embodiment after the soft soil foundation is reinforced.
  • MPa unconfined compressive strength
  • the invention uses industrial solid wastes such as carbonated steel slag, slag powder, fly ash and the like to replace the cement curing agent, and the strength of the solidified pile body can meet the design requirements. It not only solves the problem of the utilization of solid waste in the metallurgical industry, but also solves the problem of the treatment of soft soil foundations in urban development and construction.

Abstract

Disclosed is a method for consolidating a soft soil foundation by using industrial solid waste as a main raw material. The raw material of a soft soil curing agent comprises the following components in percentages by mass: 35.0-42.0% of carbonated steel slag, 22.0-27.0% of a slag powder, 6.0-10.0% of fly ash, 24.0-35.0% of cement, and 2.0-5.0% of lime, gypsum or a mixture of both in any ratio. When the total mass of soft soil, water and the soft soil curing agent is 100%, the mixing ratio of the soft soil curing agent is 12.0-20.0%; and according to the present invention, water is added at a water cement ratio of 0.45-0.55, and the mixture is stirred to prepare a soft soil curing agent slurry, which is injected into the soft soil foundation. According to the present invention, a cement curing agent is replaced with the carbonated steel slag, the slag powder and the fly ash, such that not only is the problem of the low utilization rate of industrial solid waste solved, and the consolidation cost of a mixing pile in the soft soil foundation is greatly lowered, but the treatment problem of the soft soil foundation in urban development and construction is also solved, and the present invention meets the requirements of "Technical Specifications for Consolidation Method of Mixing Pile in Soft Soil Foundation (YBJ225-91).

Description

一种以工业固废为主要原料加固软土地基的方法A method for reinforcing soft soil foundation with industrial solid waste as main raw material 技术领域technical field
本发明涉及一种以工业固体废物为主要原料的软土地基的加固方法，属于软土地基加固技术领域。The invention relates to a method for reinforcing a soft soil foundation with industrial solid waste as the main raw material, and belongs to the technical field of soft soil foundation reinforcement.
背景技术Background technique
我国是钢铁生产大国，每年产生大量的钢渣排放。长期以来，我国的钢渣利用率低，但每年仍以数千万吨的排渣量递增，大量钢渣堆积成渣山，占用大量土地。针对大量钢渣被废弃堆积，难以充分利用，重要原因是其组成中含有大量游离氧化物(f-CaO、f-MgO)，这些游离氧化物容易与水或水蒸气反应产生体积膨胀(f-CaO、f-MgO反应后的膨胀率分别为98％、148％)导致钢渣及钢渣处置后的尾渣难以进行大规模建材化利用,钢渣利用率低(低于20％)、堆存量大、堆放时间长(需陈化约6个月以上)。my country is a big steel producing country, and a large amount of steel slag is discharged every year. For a long time, the utilization rate of steel slag in my country has been low, but the amount of slag discharged every year is still increasing by tens of millions of tons. A large amount of steel slag is discarded and accumulated, and it is difficult to make full use of it. The important reason is that its composition contains a large amount of free oxides (f-CaO, f-MgO), and these free oxides easily react with water or steam to generate volume expansion (f-CaO , and f-MgO reaction expansion ratios are 98% and 148%, respectively), which makes it difficult for steel slag and tailings after steel slag disposal to be used in large-scale building materials, and the utilization rate of steel slag is low (less than 20%), and the stockpile is large. Long time (to be aged for more than 6 months).
钢铁生产过程也排放大量二氧化碳，也是我国工业固体废弃物造成大气环境污染的一种来源。因此利用钢渣中的钙镁组分与二氧化碳发生碳酸化反应，生产稳定的碳酸盐产品，不仅可以大规模固定CO 2，也可以使得钢渣的物化性能得到改变。钢渣碳酸化不仅可就近利用钢厂副产品钢渣固定其副产品废气CO 2，还可以显著降低钢渣中的游离氧化物(可将f-CaO降低到1％以下)，促进钢渣利用，实现以废治废，循环利用，具有重要的社会意义和工程应用研究背景。 The steel production process also emits a large amount of carbon dioxide, which is also a source of air pollution caused by industrial solid waste in my country. Therefore, using the carbonation reaction between calcium and magnesium components in steel slag and carbon dioxide to produce stable carbonate products can not only fix CO 2 on a large scale, but also change the physical and chemical properties of steel slag. Carbonation of steel slag can not only use the by-product steel slag of the steel plant to fix its by-product waste gas CO 2 , but also can significantly reduce the free oxides in the steel slag (f-CaO can be reduced to less than 1%), promote the utilization of steel slag, and realize waste treatment with waste. , recycling, has important social significance and engineering application research background.
另外，我国是一个人口大国，人口增长速率较快。近年来，我国的基础设施建设发展速度有大幅的提高，对土地的需求量越来越大。全国的耕地数量也在减少。这就使得我们把眼光放在了软弱地基上，充分利用和用好这些软土地基具有深远的意义。软弱土质具有天然含水量大，塑性指数大、天然孔隙比大、重度小、渗透性小等特点。具有高压缩性，强度很差，不能直接用于工程建设，地基 处理等。需要采取措施对软土进行处理，提高软土路基的稳定性，以及荷载承载能力。In addition, my country is a country with a large population, and the population growth rate is relatively fast. In recent years, the development speed of my country's infrastructure construction has been greatly improved, and the demand for land is increasing. The amount of arable land in the country is also decreasing. This makes us focus on weak foundations, and it has far-reaching significance to make full use of these soft foundations. The soft soil has the characteristics of large natural water content, large plastic index, large natural void ratio, small weight and low permeability. It has high compressibility and poor strength, and cannot be directly used in engineering construction, foundation treatment, etc. It is necessary to take measures to treat the soft soil to improve the stability of the soft soil subgrade and the load bearing capacity.
软土路基处理方法较多，分类也各有不同，包括：砂垫层法、强夯法、换填法、静力排水固结法、碎石桩法。《基层建设》2019年第33期发表的“浅析软土地基加固处理方法在道路工程中的应用”也介绍了几种常用软土地基处理方法包含：(1)浅层处理；(2)排水固结法处理；(3)粒料桩处理；(4)加固土桩处理；(5)水泥粉煤灰碎石桩(CFG)处理。但概括来说，目前固化软土地基最常用方式是添加水泥进行搅拌，通过使用特制的搅拌机械往软土中喷洒水泥进行搅拌，从而起到加固软土地基的作用。但随着现代会城市发展对环保要求的提升，使用大量水泥作为材料的固化剂已经无法满足社会的需求。There are many treatment methods for soft soil subgrade, and the classification is also different, including: sand cushion method, dynamic compaction method, replacement method, static drainage consolidation method, and gravel pile method. "Basic Construction" published in the 33rd issue of 2019, "Analysis of the application of soft soil foundation reinforcement treatment methods in road engineering" also introduced several commonly used soft soil foundation treatment methods, including: (1) Shallow layer treatment; (2) Drainage consolidation method treatment; (3) granular pile treatment; (4) reinforced soil pile treatment; (5) cement fly ash gravel pile (CFG) treatment. But in general, the most common way to solidify soft soil foundations is to add cement for mixing, and use a special mixing machine to spray cement into the soft soil for mixing, thereby strengthening the soft soil foundation. However, with the improvement of environmental protection requirements in the development of modern cities, the use of a large amount of cement as a curing agent has been unable to meet the needs of society.
发明内容SUMMARY OF THE INVENTION
本发明的目的就是针对现有技术存在的上述缺陷，而提供一种以工业固废为主要原料加固软土地基的方法，以解决现有软土地基处理中使用大量水泥，无法满足社会需求以及钢铁厂产生的废料难以进行处理的问题。The purpose of the present invention is to aim at the above-mentioned defects existing in the prior art, and to provide a method for reinforcing soft soil foundation with industrial solid waste as the main raw material, so as to solve the problem that a large amount of cement is used in the treatment of existing soft soil foundation, which cannot meet social demands and Scrap from steel plants is difficult to handle.
本发明一种以工业固废为主要原料加固软土地基的方法，采用的软土固化剂原料中各组份的质量百分含量为：碳酸化钢渣35.0％～42.0％，矿渣粉22.0％～27.0％，粉煤灰6.0～10.0％，水泥24.0％～35.0％，石灰、石膏或二者的任意比例混合物2.0～5.0％；其中工业固废碳酸化钢渣、矿渣粉、粉煤灰占软土固化剂总量的64.0～74.0％；按照以下工艺实施：The present invention is a method for reinforcing soft soil foundation by using industrial solid waste as the main raw material. 27.0%, fly ash 6.0-10.0%, cement 24.0%-35.0%, lime, gypsum or any mixture of the two 2.0-5.0%; industrial solid waste carbonated steel slag, slag powder, fly ash account for soft soil 64.0 to 74.0% of the total amount of curing agent; according to the following process:
1)软土固化剂掺入量1) The amount of soft soil curing agent added
软土、水和软土固化剂质量之和按照100％计时，软土固化剂的掺入比为12.0～22.0％；When the sum of the mass of soft soil, water and soft soil curing agent is 100%, the mixing ratio of soft soil curing agent is 12.0-22.0%;
2)施工工艺2) Construction technology
(1)软土固化剂浆液的制备：按配比称取碳酸化钢渣、矿渣粉、粉煤灰、水泥、石灰和/或石膏置于配样桶中，充分混合，然后按照0.45～0.55水灰比掺水，搅拌制成软土固化剂浆液；所述水灰比一般采用0.5为佳。(1) Preparation of soft soil curing agent slurry: Weigh carbonated steel slag, slag powder, fly ash, cement, lime and/or gypsum in a sample preparation bucket according to the proportions, mix them thoroughly, and then follow the steps of 0.45-0.55 water ash. The water-cement ratio is generally 0.5.
(2)场地平整、放样：根据可靠的水准点及控制桩点位，进行场地平整及放样。(2) Site leveling and staking: According to reliable benchmarking points and control pile positions, site leveling and staking are carried out.
(3)钻孔、喷浆：桩机应按设计桩位准确定位；所述的桩机采用搅拌钻机，启动搅拌钻机，搅拌钻机的钻头下钻至设计深度后，再反向旋转提升钻头，边提升边通过软土固化剂浆液发送装置向钻孔中喷软土固化剂浆液，搅拌钻机的钻头提升速度不宜大于0.8m/min；搅拌钻机的钻头提升至桩顶高程时，关闭软土固化剂浆液发送装置，再循环一次“下钻－提升、喷浆”直至完成该桩的施工，之后进行下一根桩的施工；搅拌钻机的钻头钻入0.5米后开动空压机，喷压缩空气。(3) Drilling and spraying: The pile driver should be positioned accurately according to the designed pile position; the described pile driver adopts the mixing drill, start the mixing drill, and after the drill bit of the mixing drill drills down to the design depth, then rotate the drill bit in the opposite direction to lift the drill bit. While lifting, spray soft soil curing agent slurry into the borehole through the soft soil curing agent slurry sending device. The lifting speed of the drill bit of the mixing rig should not be greater than 0.8m/min; when the drill bit of the mixing drilling rig is lifted to the pile top elevation, turn off the soft soil curing. The agent slurry sending device is used, and the "drilling-lifting, spraying" is recirculated once until the construction of the pile is completed, and then the construction of the next pile is carried out; after the drill bit of the mixing drilling rig is drilled into 0.5 meters, the air compressor is turned on and the compressed air is sprayed. .
所述设计深度必须进入持力层≥0.5m。软土固化剂浆液发送装置为现有技术中的水泥发送装置，其转速不小于50转/分。The design depth must enter the bearing layer ≥ 0.5m. The soft soil curing agent slurry sending device is a cement sending device in the prior art, and its rotational speed is not less than 50 rpm.
需要注意的是，软土固化剂浆液在发送前应严格过滤，一般采用两道过滤工序。制备好的浆液不得离析，不得停置过长(不超过2h)，以免浆液内结块，损坏泵体。泵送浆液前，管路应保持潮湿，以利输浆。It should be noted that the soft soil curing agent slurry should be strictly filtered before sending, and generally two filtration processes are used. The prepared slurry shall not be segregated, and shall not be left for too long (not more than 2h), so as to avoid agglomeration in the slurry and damage to the pump body. Before pumping the slurry, the pipeline should be kept moist to facilitate slurry delivery.
(4)清洗、移位：桩机移位前，应向桩机的集料斗中注人适量清水，开启浆泵，清洗全部管路中残存的浆液，直至管体干净，并将搅拌钻机的钻头清洗干净后，方可移位；(4) Cleaning and displacement: Before the pile driver is displaced, an appropriate amount of water should be poured into the collecting hopper of the pile driver, the slurry pump should be turned on, and the remaining slurry in all pipelines should be cleaned until the pipe body is clean, and the stirring rig’s The drill can be moved only after it has been cleaned;
(5)取样、检测：对钻芯进行取样、检测，检测桩身无侧限抗压强度是否满足《软土地基搅拌桩加固法技术规程》(YBJ225-91)要求，即要求其上中、下、部28d无侧限抗压强度的平均值不小0.8MPa，最小值不小于设计强度的1/3。(5) Sampling and testing: Sampling and testing the drill core to check whether the unconfined compressive strength of the pile body meets the requirements of "Technical Regulations for the Reinforcement Method of Mixed Pile on Soft Soil Foundation" (YBJ225-91), that is, the upper middle, The average value of the unconfined compressive strength of the lower part 28d is not less than 0.8MPa, and the minimum value is not less than 1/3 of the design strength.
所述的软土固化剂原料中各组份的质量百分含量优选为：碳酸化钢渣36.0％～41.0％，矿渣粉23.0％～26.0％，粉煤灰7.0～9.0％，水泥24.0％～31.0％，石灰、石膏或二者的任意比例混合物3.0～4.0％；其中工业固废碳酸化钢渣、矿渣粉、粉煤灰占软土固化剂总量的66.0～73.0％。The mass percentage content of each component in the soft soil curing agent raw material is preferably: carbonated steel slag 36.0%-41.0%, slag powder 23.0%-26.0%, fly ash 7.0-9.0%, cement 24.0%-31.0% %, lime, gypsum or a mixture of the two in any proportion of 3.0-4.0%; wherein industrial solid waste carbonated steel slag, slag powder and fly ash account for 66.0-73.0% of the total soft soil curing agent.
所述的碳酸化钢渣需控制粒径，粒径在2mm以下为宜，且越细效果越好，一般控制为1mm以下粒级质量占比80％以上。The carbonation steel slag needs to control the particle size, and the particle size is preferably below 2mm, and the finer the effect, the better the effect. Generally, the particle size below 1mm accounts for more than 80% of the mass.
进一步地，所述的碳酸化钢渣中，粒径≤1mm的物料质量占比≥80％为佳；所述的水泥为≥42.5级普通硅酸盐水泥。Further, in the carbonated steel slag, it is preferable that the mass proportion of materials with a particle size of ≤1 mm is ≥80%; the cement is ordinary Portland cement of ≥42.5 grade.
更进一步地，步骤(3)中，搅拌钻机的钻头至少下钻至持力层0.5m，软土固化剂浆液发送装置的转速不小于50转/分。Further, in step (3), the drill bit of the stirring drilling rig is drilled down to at least 0.5m of the bearing layer, and the rotational speed of the soft soil curing agent slurry sending device is not less than 50 rpm.
本发明一种以工业固废为主要原料加固软土地基的方法采用以上技术方案后，具有以下有益效果：After adopting the above technical scheme, a method for reinforcing soft soil foundation with industrial solid waste as the main raw material of the present invention has the following beneficial effects:
(1)用碳酸化钢渣、矿渣粉、粉煤灰等工业固体废物代替水泥，不仅解决冶金工业固废利用率低的问题，而且大大降低了软土地基搅拌桩加固成本；(1) The use of carbonated steel slag, slag powder, fly ash and other industrial solid wastes instead of cement not only solves the problem of low utilization rate of solid waste in the metallurgical industry, but also greatly reduces the reinforcement cost of soft soil foundation mixing piles;
(2)首次将碳酸化钢渣用于软土地基加固，碳酸化钢渣为稳定的碳酸盐产品，游离氧化物含量低、安定性好；(2) Carbonated steel slag is used for soft soil foundation reinforcement for the first time. Carbonated steel slag is a stable carbonate product with low free oxide content and good stability;
(3)提高了软土地基的承载能力，桩身无侧限抗压强度时均满足《软土地基搅拌桩加固法技术规程》(YBJ225-91)要求；(3) The bearing capacity of the soft soil foundation has been improved, and the unconfined compressive strength of the pile body can meet the requirements of "Technical Regulations for the Reinforcement Method of Soft Soil Foundation Mixing Pile" (YBJ225-91);
(4)本发明在施工过程中无振动、无噪音，对环境无污染；(4) The present invention has no vibration, no noise and no pollution to the environment during construction;
(5)对土体无侧向挤压，相对于传统水泥的固结减少了固化土干缩性，对邻近建筑物影响很小，可最大限度的利用原状土，可有效提高地基强度；(5) There is no lateral extrusion on the soil, which reduces the dry shrinkage of the solidified soil compared with the consolidation of traditional cement, and has little impact on the adjacent buildings, which can maximize the use of the undisturbed soil and effectively improve the strength of the foundation;
(6)本发明将软土固化剂浆液通过搅拌钻机喷入到软土地基深处，使喷入软土中的软土固化剂浆液中的各组份和软土之间产生一系列物理化学反应和协同效应，从而显著提高了加固后的软土地基 强度。(6) In the present invention, the soft soil solidifying agent slurry is sprayed into the depth of the soft soil foundation through a stirring drilling rig, so that a series of physical and chemical reactions are produced between the components in the soft soil solidifying agent slurry sprayed into the soft soil and the soft soil. reaction and synergistic effect, thereby significantly improving the strength of the reinforced soft soil foundation.
具体实施方式Detailed ways
为进一步描述本发明，下面结合实施例，对本发明一种以工业固废为主要原料加固软土地基的方法做进一步说明。但本发明并不局限于实施例。In order to further describe the present invention, a method for reinforcing soft soil foundation with industrial solid waste as the main raw material of the present invention will be further described below with reference to the examples. However, the present invention is not limited to the examples.
本发明采用的软土固化剂原料中各组份的质量百分含量为：碳酸化钢渣35.0％～42.0％，矿渣粉22.0％～27.0％，粉煤灰6.0～10.0％，水泥24.0％～35.0％，石灰、石膏或二者的任意比例混合物2.0～5.0％。The mass percentage content of each component in the soft soil curing agent raw material used in the present invention is: carbonated steel slag 35.0%-42.0%, slag powder 22.0%-27.0%, fly ash 6.0-10.0%, cement 24.0%-35.0% %, lime, gypsum or a mixture of the two in any proportion of 2.0 to 5.0%.
所述的碳酸化钢渣需控制粒径，粒径在2mm以下为佳，且越细效果越好，水泥为42.5级普通硅酸盐水泥。软土固化剂均采用干料配制，软土固化剂浆液按水灰比0.5配制。所述碳酸化钢渣主要由铁的氧化物、钙的氧化物、脱硫石膏、铝渣以及少量锰的氧化物所组成。The carbonation steel slag needs to control the particle size, the particle size is preferably below 2mm, and the finer the effect, the better the cement is 42.5 grade ordinary Portland cement. The soft soil curing agent is prepared with dry materials, and the soft soil curing agent slurry is prepared according to the water-cement ratio of 0.5. The carbonated steel slag is mainly composed of iron oxides, calcium oxides, desulfurized gypsum, aluminum slag and a small amount of manganese oxides.
本发明方法一种以工业固废为主要原料加固软土地基的方法采用以下工艺、步骤施工：The method of the present invention is a method for reinforcing soft soil foundation with industrial solid waste as the main raw material and adopts the following techniques and steps to construct:
(1)按配比称取碳化钢渣、矿渣粉、粉煤灰及石灰、石膏或二者的混合物与水泥置于配样桶中，充分混合，然后按照0.5水灰比掺水，搅拌制成软土固化剂浆液。(1) Weigh carbonized steel slag, slag powder, fly ash and lime, gypsum or the mixture of the two and cement in the sample preparation bucket according to the proportion, mix them thoroughly, then add water according to the water-cement ratio of 0.5, and stir to make soft Soil stabilizer slurry.
(2)施工根据可靠的水准点及控制桩点位，进行平整场地及放样，钻机应按设计桩位准确定位。启动搅拌钻机，钻入0.5米后开动空压机，喷压缩空气，钻进至设计深度。注意须进入持力层0.5m，提升钻至设计加固深度后，反向旋转，边提边喷软土固化剂浆液，钻机提升速度不宜大于0.8m/min，水泥发送装置的转速不小于50转/分；(2) The construction shall be based on the reliable leveling point and control pile position, and the site shall be leveled and set out. The drilling rig shall be accurately positioned according to the designed pile position. Start the mixing drilling rig, start the air compressor after drilling 0.5 meters, spray compressed air, and drill to the design depth. Note that it is necessary to enter the bearing layer 0.5m, lift the drill to the designed reinforcement depth, rotate in reverse, spray soft soil curing agent slurry while lifting, the lifting speed of the drill should not be greater than 0.8m/min, and the speed of the cement sending device should not be less than 50 rpm /Minute;
(3)钻头提升至桩顶高程关闭水泥发送装置，再次下钻重复步骤(2)直至完成该桩的施工。之后进行下一根桩的施工。(3) The drill bit is raised to the pile top elevation, and the cement sending device is closed, and the drilling is performed again to repeat step (2) until the construction of the pile is completed. The construction of the next pile is then carried out.
(4)桩机移位前，应向集料斗中注人适量清水，开启浆泵，清 洗全部管路中残存的浆液，直至管体干净，并将搅拌头清洗干净后，方可移位。(4) Before the pile driver is displaced, an appropriate amount of water should be poured into the collecting hopper, the slurry pump should be turned on, and the remaining slurry in all pipelines should be cleaned until the pipe body is clean and the stirring head is cleaned before displacement.
(5)软土固化剂浆液应严格过滤，并按喷嘴直径设置两道过滤装置。制备好的浆液不得离析，不得停置过长(不超过2h)，以免浆液内结块，损坏泵体。泵送浆液前，管路应保持潮湿，以利输浆。(5) The soft soil curing agent slurry should be strictly filtered, and two filtering devices should be set up according to the diameter of the nozzle. The prepared slurry shall not be segregated, and shall not be left for too long (not more than 2h), so as to avoid agglomeration in the slurry and damage to the pump body. Before pumping the slurry, the pipeline should be kept moist to facilitate slurry delivery.
(6)检测桩身无侧限抗压强度是否满足《软土地基搅拌桩加固法技术规程》(YBJ225-91)要求，即要求其上中下部(按桩长1/3等分)28d无侧限抗压强度的平均值不小0.8MPa，最小值不小于设计强度的1/3。(6) Check whether the unconfined compressive strength of the pile body meets the requirements of the "Technical Regulations for the Reinforcement Method of Soft Soil Foundation Mixing Pile" (YBJ225-91), that is, the upper, middle and lower parts (divided by 1/3 of the pile length) are required to be free for 28d. The average value of the confining compressive strength is not less than 0.8MPa, and the minimum value is not less than 1/3 of the design strength.
本发明方法采用的软土固化剂各实施例配比如表1所示，表2为加固软土地基后各实施例桩身上中下部28d的无侧限抗压强度(MPa)结果。实施例中，所述的碳酸化钢渣需控制粒径，粒径在2mm以下为佳，且越细效果越好，水泥为42.5级普通硅酸盐水泥。Table 1 shows the proportions of each embodiment of the soft soil curing agent used in the method of the present invention, and Table 2 shows the unconfined compressive strength (MPa) results of the middle and lower 28d of the pile body of each embodiment after the soft soil foundation is reinforced. In the embodiment, the particle size of the carbonated steel slag needs to be controlled.
表1 软土固化剂各组分及配比(％)Table 1 Components and proportions of soft soil curing agent (%)
Figure PCTCN2021116000-appb-000001
Figure PCTCN2021116000-appb-000001
表2 实施例1-6桩身上中下部28d的无侧限抗压强度(MPa)Table 2 The unconfined compressive strength (MPa) of the middle and lower part 28d of the pile body of Example 1-6
Figure PCTCN2021116000-appb-000002
Figure PCTCN2021116000-appb-000002
试验研究及表1、表2结果表明，实施例1～实施例7在检测桩身无侧限抗压强度时均满足《软土地基搅拌桩加固法技术规程》(YBJ225-91)要求，即桩身上中下部(按桩长1/3等分)28d无侧限抗压强度的平均值不小于0.8MPa，最小值不小于设计强度的1/3。碳酸化钢渣、矿渣粉和水泥组合的软土固化剂在固化软土地基时取得了意想不到的效果。The experimental research and the results in Table 1 and Table 2 show that Examples 1 to 7 all meet the requirements of "Technical Regulations for Reinforcement Method of Stirred Pile on Soft Soil Foundation" (YBJ225-91) when testing the unconfined compressive strength of the pile body, namely The average value of the 28d unconfined compressive strength of the middle and lower parts of the pile body (divided by 1/3 of the pile length) is not less than 0.8MPa, and the minimum value is not less than 1/3 of the design strength. The soft soil curing agent of carbonated steel slag, slag powder and cement has achieved unexpected results in curing soft soil foundations.
本发明利用碳酸化钢渣、矿渣粉、粉煤灰等工业固体废物代替水泥固化剂，固化后的桩身强度均满足设计要求。不仅解决冶金工业固废的利用问题，也解决了城市发展建设中软土地基的处理问题。The invention uses industrial solid wastes such as carbonated steel slag, slag powder, fly ash and the like to replace the cement curing agent, and the strength of the solidified pile body can meet the design requirements. It not only solves the problem of the utilization of solid waste in the metallurgical industry, but also solves the problem of the treatment of soft soil foundations in urban development and construction.

Claims (6)

  1. 一种以工业固废为主要原料加固软土地基的方法，其特征在于所述的软土固化剂原料中各组份的质量百分含量为：碳酸化钢渣35.0％～42.0％，矿渣粉22.0％～27.0％，粉煤灰6.0～10.0％，水泥24.0％～35.0％，石灰、石膏或二者的任意比例混合物2.0～5.0％；其中工业固废碳酸化钢渣、矿渣粉、粉煤灰占软土固化剂总量的64.0～74.0％；按照以下工艺实施：A method for reinforcing soft soil foundation with industrial solid waste as the main raw material, characterized in that the mass percentage of each component in the soft soil solidifying agent raw material is: carbonated steel slag 35.0%-42.0%, slag powder 22.0% %～27.0%, fly ash 6.0～10.0%, cement 24.0%～35.0%, lime, gypsum or any mixture of the two 2.0～5.0%; of which industrial solid waste carbonated steel slag, slag powder and fly ash account for 64.0 to 74.0% of the total amount of soft soil curing agent; according to the following process:
    1)软土固化剂掺入量1) The amount of soft soil curing agent added
    软土、水和软土固化剂质量之和按照100％计时，软土固化剂的掺入比为12.0～22.0％；When the sum of the mass of soft soil, water and soft soil curing agent is 100%, the mixing ratio of soft soil curing agent is 12.0-22.0%;
    2)施工工艺2) Construction technology
    (1)软土固化剂浆液的制备：按配比称取碳酸化钢渣、矿渣粉、粉煤灰、水泥、石灰和/或石膏置于配样桶中，充分混合，然后按照0.45～0.55水灰比掺水，搅拌制成软土固化剂浆液；(1) Preparation of soft soil curing agent slurry: Weigh carbonated steel slag, slag powder, fly ash, cement, lime and/or gypsum in a sample preparation bucket according to the proportions, mix them thoroughly, and then follow the steps of 0.45-0.55 water ash. Mix with water and stir to make soft soil curing agent slurry;
    (2)场地平整、放样：根据可靠的水准点及控制桩点位，进行场地平整及放样；(2) Site leveling and staking: According to reliable benchmarking points and control pile positions, site leveling and staking are carried out;
    (3)钻孔、喷浆：桩机应按设计桩位准确定位；所述的桩机采用搅拌钻机，启动搅拌钻机，搅拌钻机的钻头下钻至设计深度后，再反向旋转提升钻头，边提升边通过软土固化剂浆液发送装置向钻孔中喷软土固化剂浆液，搅拌钻机的钻头提升速度不宜大于0.8m/min；搅拌钻机的钻头提升至桩顶高程时，关闭软土固化剂浆液发送装置，再循环一次“下钻－提升、喷浆”直至完成该桩的施工，之后进行下一根桩的施工；(3) Drilling and spraying: The pile driver should be positioned accurately according to the designed pile position; the described pile driver adopts the mixing drill, start the mixing drill, and after the drill bit of the mixing drill drills down to the design depth, then rotate the drill bit in the opposite direction to lift the drill bit. While lifting, spray soft soil curing agent slurry into the borehole through the soft soil curing agent slurry sending device. The lifting speed of the drill bit of the mixing rig should not be greater than 0.8m/min; when the drill bit of the mixing drilling rig is lifted to the pile top elevation, turn off the soft soil curing. The agent slurry sending device is used, and the "drilling-lifting, spraying" is recycled once until the construction of the pile is completed, and then the construction of the next pile is carried out;
    (4)清洗、移位：桩机移位前，应向桩机的集料斗中注人适量清水，开启浆泵，清洗全部管路中残存的浆液，直至管体干净，并将搅拌钻机的钻头清洗干净后，方可移位；(4) Cleaning and displacement: Before the pile driver is displaced, an appropriate amount of water should be poured into the collecting hopper of the pile driver, the slurry pump should be turned on, and the remaining slurry in all pipelines should be cleaned until the pipe body is clean, and the stirring rig’s The drill can be moved only after it has been cleaned;
    (5)取样、检测：对钻芯进行取样、检测，检测桩身无侧限抗 压强度是否满足《软土地基搅拌桩加固法技术规程》(YBJ225-91)要求，即要求其上中、下、部28d无侧限抗压强度的平均值不小0.8MPa，最小值不小于设计强度的1/3。(5) Sampling and testing: Sampling and testing the drill core to check whether the unconfined compressive strength of the pile body meets the requirements of "Technical Regulations for the Reinforcement Method of Mixed Pile on Soft Soil Foundation" (YBJ225-91), that is, the upper middle, The average value of the unconfined compressive strength of the lower part 28d is not less than 0.8MPa, and the minimum value is not less than 1/3 of the design strength.
  2. 如权利要求1所述的一种以工业固废为主要原料加固软土地基的方法，其特征在于所述的软土固化剂原料中各组份的质量百分含量为：碳酸化钢渣36.0％～41.0％，矿渣粉23.0％～26.0％，粉煤灰7.0～9.0％，水泥24.0％～31.0％，石灰、石膏或二者的任意比例混合物3.0～4.0％；其中工业固废碳酸化钢渣、矿渣粉、粉煤灰占软土固化剂总量的66.0～73.0％。A method for reinforcing soft soil foundation with industrial solid waste as main raw material as claimed in claim 1, wherein the mass percentage of each component in the described soft soil solidifying agent raw material is: carbonated steel slag 36.0% ～41.0%, slag powder 23.0%～26.0%, fly ash 7.0～9.0%, cement 24.0%～31.0%, lime, gypsum or any mixture of the two 3.0～4.0%; Slag powder and fly ash account for 66.0-73.0% of the total soft soil curing agent.
  3. 如权利要求1或2所述的一种以工业固废为主要原料加固软土地基的方法，其特征在于：所述的碳酸化钢渣粒径≤2mm。A method for reinforcing soft soil foundations with industrial solid waste as the main raw material according to claim 1 or 2, characterized in that the particle size of the carbonated steel slag is less than or equal to 2 mm.
  4. 如权利要求3所述的一种以工业固废为主要原料加固软土地基的方法，其特征在于：所述的碳酸化钢渣中，粒径≤1mm的物料质量占比≥80％；所述的水泥为≥42.5级普通硅酸盐水泥。The method for reinforcing soft soil foundations with industrial solid waste as the main raw material according to claim 3, characterized in that: in the carbonated steel slag, the mass proportion of materials with particle size ≤ 1 mm is ≥ 80%; The cement is ≥42.5 grade ordinary Portland cement.
  5. 如权利要求4所述的一种以工业固废为主要原料加固软土地基的方法，其特征在于：步骤(3)中，搅拌钻机的钻头至少下钻至持力层0.5m。The method for reinforcing soft soil foundations with industrial solid waste as the main raw material according to claim 4, characterized in that: in step (3), the drill bit of the stirring drilling rig is drilled down to at least 0.5m of the bearing layer.
  6. 如权利要求5所述的一种以工业固废为主要原料加固软土地基的方法，其特征在于：步骤(3)中软土固化剂浆液发送装置的转速不小于50转/分。A method for reinforcing soft soil foundation with industrial solid waste as main raw material as claimed in claim 5, characterized in that: in step (3), the rotational speed of the soft soil curing agent slurry sending device is not less than 50 rpm.
PCT/CN2021/116000 2021-01-27 2021-09-01 Method for consolidating soft soil foundation by using industrial solid waste as main raw material WO2022160712A1 (en)

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CN116217150A (en) * 2023-03-03 2023-06-06 天津中岩大地材料科技有限公司 Curing agent for deep single-shaft sludge stirring pile and preparation method thereof
CN116768588A (en) * 2023-06-13 2023-09-19 湖北大学 Preparation method of phosphogypsum solidified sludge for road material
CN116813264A (en) * 2023-08-29 2023-09-29 中铁七局集团广州工程有限公司 Cement foundation material curing agent
CN117603707A (en) * 2024-01-22 2024-02-27 中建八局西南建设工程有限公司 Solid waste-based soil curing agent and preparation method and application thereof

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CN115504638A (en) * 2022-08-26 2022-12-23 中交第二航务工程局有限公司 Carbon dioxide mineralization maintenance method for river and lake dredging bottom mud
CN115504638B (en) * 2022-08-26 2023-06-23 中交第二航务工程局有限公司 Carbon dioxide mineralization maintenance method for river and lake dredging bottom mud
CN115321788A (en) * 2022-09-09 2022-11-11 太原理工大学 Rapid sludge curing agent and preparation method and application thereof
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CN115450082A (en) * 2022-10-13 2022-12-09 中交四航工程研究院有限公司 Light curing modification construction method for soft soil
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CN116217150A (en) * 2023-03-03 2023-06-06 天津中岩大地材料科技有限公司 Curing agent for deep single-shaft sludge stirring pile and preparation method thereof
CN116768588A (en) * 2023-06-13 2023-09-19 湖北大学 Preparation method of phosphogypsum solidified sludge for road material
CN116813264A (en) * 2023-08-29 2023-09-29 中铁七局集团广州工程有限公司 Cement foundation material curing agent
CN116813264B (en) * 2023-08-29 2023-11-14 中铁七局集团广州工程有限公司 Cement foundation material curing agent
CN117603707A (en) * 2024-01-22 2024-02-27 中建八局西南建设工程有限公司 Solid waste-based soil curing agent and preparation method and application thereof
CN117603707B (en) * 2024-01-22 2024-03-22 中建八局西南建设工程有限公司 Solid waste-based soil curing agent and preparation method and application thereof

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