An Ecological Grouting Material and Production Process for Shield Tunneling Excavated Soil Based on Geological Adaptability

Abstract

The present application relates to the technical field of tunnel and underground engineering shield grouting, and particularly relates to a kind of shield muck ecological grouting material and production process based on stratum adaptability, the ecological grouting material is prepared from shield muck, carbide slag, slag, fly ash and water reducing agent classified by fineness modulus, the technical scheme forms the preparation process of muck-crushing-preliminary screening-grinding-fineness screening-hydrolysis mud adding-group mixing and ecological grouting material for different stratum adaptability, the ecological grouting material has the dual advantages of green environmental protection and stratum adaptability, at the same time, the ecological grouting material has greater apparent density, low bleeding rate, high compressive strength and good water-land strength ratio and other advantages, the material is mainly applied to the shield tunnel wall grouting of tunnel and underground engineering, and is mainly used for enhancing soil stability and ensuring the safety of ground buildings.

Description

Technical Field

[0001] This invention relates to the field of tunnel and underground engineering shield grouting technology, and in particular to an ecological grouting material and production process for shield excavated soil based on geological adaptability. Background Technology

[0002] In the planning and construction of modern cities, underground tunnels are an important component of infrastructure such as transportation and water conservancy. Constructing underground tunnels requires extensive engineering work, and shield tunneling technology, due to its efficiency and safety, has gradually become the primary construction method for underground tunnel projects. However, the operation of shield tunneling machines generates a large amount of excavated soil, the physical properties and chemical composition of which are closely related to the geological characteristics. This soil typically includes soil particles, rock debris, and organic matter, making its composition complex and difficult to handle. Therefore, how to effectively manage this excavated soil has become an urgent problem to be solved in shield tunnel engineering.

[0003] Therefore, existing technologies have proposed using shield tunneling excavation soil as the main raw material to prepare grouting materials, thereby achieving the treatment of shield tunneling excavation soil. However, since the fineness modulus of shield tunneling excavation soil has a significant impact on its physical and mechanical properties, even for the same type of soil, different fineness moduli can lead to significant differences in its engineering properties. During the tunneling process of shield machines, diverse geological environments are encountered, and different geological conditions place specific requirements on grouting materials. However, current shield tunneling excavation soil grouting materials do not fully consider the issue of stratum adaptability, resulting in limited practicality and difficulty in achieving the expected results. Summary of the Invention

[0004] The purpose of this invention is to provide an ecological grouting material and production process for shield tunneling excavated soil based on geological adaptability, thereby solving the problem that current shield tunneling excavated soil grouting materials do not fully consider geological adaptability, resulting in limited practicality and difficulty in achieving the expected results.

[0005] To achieve the above objectives, the present invention provides a shield tunneling slag ecological grouting material and production process based on geological adaptability. The geological adaptability shield tunneling slag ecological grouting material is made from the following raw materials in parts by weight: 50-70 parts of different types of shield tunneling mud, 10-15 parts of calcium carbide slag, 10-15 parts of blast furnace slag, 5-10 parts of fly ash, and 1-3 parts of water-reducing agent, wherein the water content meets the mud specific gravity range of 1.55-1.75.

[0006] The different types of shield tunneling waste soil mentioned above refer to the waste soil generated from different tunnels and underground shield tunneling projects.

[0007] The fly ash is Class II ash, the water-reducing agent is an early-strength water-reducing agent, the carbide slag is fine-particle carbide slag, and the slag is water-quenched slag.

[0008] This invention also provides a production process for a geologically adaptable shield tunneling excavation ecological grouting material, applicable to the geologically adaptable shield tunneling excavation ecological grouting material as described above, comprising the following steps:

[0009] S1: Different types of tunnel boring machine excavation soil are crushed and then screened.

[0010] S2: The sieved fine particles are evenly loaded into a ball mill for grinding. After grinding, the ground product is transferred to a dry container for storage.

[0011] S3: Based on the geological conditions, select shield tunneling slag with different fineness moduli as a group, add water to dissolve the mud, and then weigh out the required number of parts according to the proportion and mix them for later use.

[0012] S4: Based on different fineness moduli, the shield tunnel slag after adding hydrolyzed mud is classified into slag type 1 and slag type 2, and the moisture content is adjusted to prepare mud with different properties, so as to obtain shield tunnel slag mud one and shield tunnel slag mud two for later use.

[0013] S5: The carbide slag, the slag, and the fly ash are screened to make their maximum particle size less than 120μm. The carbide slag, the slag, and the fly ash are mixed and stirred to form a uniform mixture I. Mixture I is combined with the water-reducing agent and mixed and stirred to obtain mixture II.

[0014] S6: Mix and stir mixture II, shield tunneling slag slurry I and shield tunneling slag slurry II to obtain the shield tunneling slag ecological grouting material based on geological adaptability.

[0015] In step S1, the shield tunneling excavated soil needs to be classified into shield tunneling excavated soil I, shield tunneling excavated soil II, shield tunneling excavated soil III, shield tunneling excavated soil IV, and shield tunneling excavated soil V during the screening process. The fineness modulus of shield tunneling excavated soil I is 4.6-3.8, the fineness modulus of shield tunneling excavated soil II is 3.7-3.1, the fineness modulus of shield tunneling excavated soil III is 3.0-2.3, the fineness modulus of shield tunneling excavated soil IV is 2.2-1.6, and the fineness modulus of shield tunneling excavated soil V is 1.5-0.7. The particle size of the screened shield tunneling excavated soil must be less than 3 mm.

[0016] In step S2, the feeding ratio of the ball mill is 1:10, that is, about 1000 kg of grinding balls need to be added for every 100 kg of material. The grinding balls are selected with a diameter of 10-15 mm and good wear resistance. The grinding speed is set to 300-400 RPM and the grinding time is initially set to 3 hours, which can be extended to 5 hours depending on the real-time particle size change.

[0017] In step S2, during the grinding process, the temperature inside the ball mill is controlled below 60°C, and samples are taken every hour. The D50 value is detected using a particle size analyzer, with a target D50 < 20 μm.

[0018] In step S5, the mixing conditions for the carbide slag, the slag and the fly ash are as follows: the mixing speed is set to 200-300 r / min and the mixing time is set to 2 to 3 minutes.

[0019] In step S5, the conditions for mixing and stirring mixture I with the water-reducing agent are as follows: the mixing and stirring rate is set to 200-300 r / min, and the mixing and stirring time is set to 2 to 3 minutes.

[0020] In step S6, the mixing conditions for mixing mixture II and the composite mud mixture are: the mixing speed is set to 550-700 r / min, and the mixing time is set to 150 to 180 seconds.

[0021] This invention discloses an ecological grouting material and production process for shield tunnel slag based on geological adaptability. The material comprises 50-70 parts of different types of shield tunnel slurry, 10-15 parts of calcium carbide slag, 10-15 parts of blast furnace slag, 5-10 parts of fly ash, and 1-3 parts of water-reducing agent. This ecological grouting material is prepared from shield tunnel slag, calcium carbide slag, blast furnace slag, fly ash, and water-reducing agent classified by fineness modulus. This technical solution establishes a preparation process of slag-crushing-preliminary screening-grinding-fine screening-hydration and mud-dissolving-group mixing, and ecological grouting materials adapted to different geological formations. The prepared ecological grouting material has the dual advantages of being green and environmentally friendly while also being adaptable to geological formations. Furthermore, this ecological grouting material possesses advantages such as high apparent density, low bleeding rate, high compressive strength, and a good water-to-land strength ratio. This material is mainly used for grouting behind the walls of shield tunnels and underground engineering projects, primarily to enhance soil stability and ensure the safety of surface structures. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a process flow diagram of the production process of the shield tunneling slag ecological grouting material based on geological adaptability provided by the present invention. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0025] This invention provides an ecological grouting material for shield tunneling slag based on geological adaptability, which is made from the following raw materials in parts by weight: 50-70 parts of different types of shield tunneling mud, 10-15 parts of calcium carbide slag, 10-15 parts of blast furnace slag, 5-10 parts of fly ash and 1-3 parts of water-reducing agent, wherein the water content meets the mud specific gravity range of 1.55-1.75.

[0026] Among them, the different types of shield tunneling slag are waste slag generated from different tunnels and underground shield tunneling projects, the fly ash is Class II ash, the water reducing agent is an early-strength water reducing agent, the carbide slag is fine-particle carbide slag, and the slag is water-quenched slag.

[0027] In this embodiment, by using different types of shield tunneling slag, carbide slag, mineral slag, and fly ash, and other industrial by-products, the pollution of the environment by waste is reduced, the demand for the extraction of natural resources is lowered, and the recycling of resources is realized. The prepared grouting material has a low bleeding rate, which reduces water waste during construction. Moreover, its composition is environmentally friendly, which greatly reduces the negative impact on the environment. The application of this ecological grouting material in tunnels and underground engineering can not only ensure the quality of the project, but also effectively reduce the interference with the surrounding ecological environment during construction, thereby improving the sustainability of the project.

[0028] Please see Figure 1 The present invention also provides a production process for a ground-adaptive shield tunneling slag ecological grouting material, applicable to the ground-adaptive shield tunneling slag ecological grouting material as described above, comprising the following steps:

[0029] S1: Different types of tunnel boring machine excavation soil are crushed and then screened.

[0030] S2: The sieved fine particles are evenly loaded into a ball mill for grinding. After grinding, the ground product is transferred to a dry container for storage.

[0031] S3: Based on the geological conditions, select shield tunneling slag with different fineness moduli as a group, add water to dissolve the mud, and then weigh out the required number of parts according to the proportion and mix them for later use.

[0032] S4: Based on different fineness moduli, the shield tunnel slag after adding hydrolyzed mud is classified into slag type 1 and slag type 2, and the moisture content is adjusted to prepare mud with different properties, so as to obtain shield tunnel slag mud one and shield tunnel slag mud two for later use.

[0033] S5: The carbide slag, the slag, and the fly ash are screened to make their maximum particle size less than 120μm. The carbide slag, the slag, and the fly ash are mixed and stirred to form a uniform mixture I. Mixture I is combined with the water-reducing agent and mixed and stirred to obtain mixture II.

[0034] S6: Mix and stir mixture II, shield tunneling slag slurry I and shield tunneling slag slurry II to obtain the shield tunneling slag ecological grouting material based on geological adaptability.

[0035] Preferably, in step S1, the shield tunneling excavated soil needs to be classified into shield tunneling excavated soil I, shield tunneling excavated soil II, shield tunneling excavated soil III, shield tunneling excavated soil IV, and shield tunneling excavated soil V during the screening process. The fineness modulus of shield tunneling excavated soil I is 4.6-3.8, the fineness modulus of shield tunneling excavated soil II is 3.7-3.1, the fineness modulus of shield tunneling excavated soil III is 3.0-2.3, the fineness modulus of shield tunneling excavated soil IV is 2.2-1.6, and the fineness modulus of shield tunneling excavated soil V is 1.5-0.7. Furthermore, the particle size of the screened shield tunneling excavated soil must be less than 3 mm.

[0036] Preferably, in step S2, the feeding ratio of the ball mill is 1:10, that is, about 1000 kg of grinding balls need to be added for every 100 kg of material. The grinding balls are selected from grinding ball materials with a diameter of 10-15 mm and good wear resistance. The grinding speed is set to 300-400 RPM, and the grinding time is initially set to 3 hours, which can be extended to 5 hours depending on the real-time particle size change.

[0037] Preferably, in step S2, during the grinding process, the temperature inside the ball mill is controlled below 60°C, and samples are taken every hour, and the D50 value is detected using a particle size analyzer, with a target D50 < 20 μm.

[0038] Preferably, in step S4, shield tunneling slurry one and shield tunneling slurry two together constitute the different types of shield tunneling slurry.

[0039] Preferably, in step S5, the mixing conditions for the carbide slag, the slag and the fly ash are: the mixing speed is set to 200-300 r / min and the mixing time is set to 2 to 3 minutes.

[0040] Preferably, in step S5, the conditions for mixing and stirring the mixture I with the water-reducing agent are: the mixing and stirring rate is set to 200-300 r / min, and the mixing and stirring time is set to 2 to 3 minutes.

[0041] Preferably, in step S6, the mixing conditions for mixing mixture II and the composite mud mixture are: the mixing speed is set to 550-700 r / min, and the mixing time is set to 150 to 180 seconds.

[0042] Preferably, based on different geological conditions, the strata can be adaptively classified into the following types: sand-clay composite strata, silty clay strata, soft upper layer and hard lower layer strata, and mixed strata of medium-coarse sand and granite. For the adaptability evaluation of each type of stratum, the selection of the fineness modulus is considered crucial. Specifically, the combination of fineness modulus III and fineness modulus IV is more suitable for sand-clay composite strata; the combination of fineness modulus IV and fineness modulus V is suitable for silty clay strata; the mixture of fineness modulus II and fineness modulus III can be effectively applied to soft upper layer and hard lower layer strata; and the combination of fineness modulus I and fineness modulus II is suitable for mixed strata of medium-coarse sand and granite.

[0043] In this embodiment, the ecological grouting material of this technical solution achieves adaptive optimization for different geological conditions by combining different components (such as different types of shield tunneling mud, carbide slag, blast furnace slag, and fly ash). By controlling the fineness modulus of the material, the grouting material can effectively fill soil layers with different structures and pores, improving the construction efficiency and material performance of the project. The prepared grouting material has high compressive strength and excellent water-to-land strength ratio, which can effectively enhance the soil stability in the injection area, reduce the risks caused by soil inhomogeneity, and ensure the safety of the ground and surrounding buildings. Based on the geological characteristics, the material ratio and processing technology can be adjusted to flexibly address complex geological conditions, ensuring effectiveness in various environments. By using different types of shield tunneling slag, carbide slag, mine slag, and fly ash as raw materials, the pollution of the environment by waste is reduced, while the demand for natural resource extraction is lowered, realizing resource recycling. The prepared grouting material has a low bleeding rate, reducing water waste during construction, and its environmentally friendly composition greatly reduces negative environmental impact. The application of this ecological grouting material in tunnels and underground engineering not only ensures project quality but also effectively reduces interference with the surrounding ecological environment during construction, improving the sustainability of the project.

[0044] Example 1:

[0045] This invention proposes an ecological grouting material for shield tunneling excavation soil based on geological adaptability. Its raw materials include (parts by weight): 40 parts of shield tunneling excavation soil slurry one, 30 parts of shield tunneling excavation soil slurry two, 10 parts of calcium carbide slag, 10 parts of blast furnace slag, 19 parts of fly ash, and 1 part of water-reducing agent. Shield tunneling excavation soil slurry one and shield tunneling excavation soil slurry two constitute the different types of shield tunneling slurry.

[0046] The production process of the shield tunneling slag ecological grouting material based on geological adaptability includes the following steps:

[0047] Different types of tunnel boring machine excavation soil are crushed and then screened.

[0048] The sieved fine particles are evenly loaded into a ball mill for grinding. After grinding, the ground product is transferred to a dry container for storage.

[0049] Based on the geological conditions, shield tunneling excavated soil with different fineness moduli was selected as a group and hydrated into mud. Then, the required amount was weighed according to the proportion and mixed for later use.

[0050] The tunnel boring machine excavated soil was divided into excavated soil type 1 and excavated soil type 2. It was classified according to different fineness moduli and the moisture content was adjusted to prepare mud with different properties, thus obtaining tunnel boring machine excavated soil mud one and tunnel boring machine excavated soil mud two for later use.

[0051] Ten parts of the carbide slag, ten parts of the slag, and nineteen parts of the fly ash are sieved to make the maximum particle size less than 120 μm. The carbide slag, the slag, and the fly ash are mixed and stirred to form a uniform mixture I. Mixture I is combined with one part of the water-reducing agent and mixed and stirred to obtain mixture II.

[0052] Take 40 parts of shield tunneling slag slurry I and 30 parts of shield tunneling slag slurry II and mix them with mixture II. Stir the mixture at a stirring speed of 550 r / min for at least 150 s to obtain the shield tunneling slag ecological grouting material based on stratum adaptability.

[0053] Example 2:

[0054] This invention proposes an ecological grouting material for shield tunneling excavation soil based on geological adaptability. Its raw materials include (parts by weight): 50 parts of shield tunneling excavation soil slurry one, 10 parts of shield tunneling excavation soil slurry two, 15 parts of calcium carbide slag, 10 parts of blast furnace slag, 19 parts of fly ash, and 1 part of water-reducing agent. Shield tunneling excavation soil slurry one and shield tunneling excavation soil slurry two constitute the different types of shield tunneling slurry.

[0055] The production process of the shield tunneling slag ecological grouting material based on geological adaptability includes the following steps:

[0056] Different types of tunnel boring machine excavation soil are crushed and then screened.

[0057] The sieved fine particles are evenly loaded into a ball mill for grinding. After grinding, the ground product is transferred to a dry container for storage.

[0058] Based on the geological conditions, shield tunneling excavated soil with different fineness moduli was selected as a group and hydrated into mud. Then, the required amount was weighed according to the proportion and mixed for later use.

[0059] The tunnel boring machine excavated soil was divided into excavated soil type 1 and excavated soil type 2. It was classified according to different fineness moduli and the moisture content was adjusted to prepare mud with different properties, thus obtaining tunnel boring machine excavated soil mud one and tunnel boring machine excavated soil mud two for later use.

[0060] 15 parts of the carbide slag, 10 parts of the slag and 19 parts of the fly ash are screened to make the maximum particle size less than 120 μm. The carbide slag, the slag and the fly ash are mixed and stirred to form a uniform mixture I. Mixture I is combined with 1 part of the water-reducing agent and mixed and stirred to obtain mixture II.

[0061] Take 50 parts of shield tunneling slag slurry I and 10 parts of shield tunneling slag slurry II and mix them with mixture II. Stir the mixture at a stirring speed of 550 r / min for at least 155 s to obtain the shield tunneling slag ecological grouting material based on stratum adaptability.

[0062] Example 3:

[0063] This invention proposes an ecological grouting material for shield tunneling excavation soil based on geological adaptability. Its raw materials include (parts by weight): 30 parts of shield tunneling excavation soil slurry one, 40 parts of shield tunneling excavation soil slurry two, 15 parts of calcium carbide slag, 15 parts of blast furnace slag, 19 parts of fly ash, and 1 part of water-reducing agent. Shield tunneling excavation soil slurry one and shield tunneling excavation soil slurry two constitute the different types of shield tunneling slurry.

[0064] The production process of the shield tunneling slag ecological grouting material based on geological adaptability includes the following steps:

[0065] Different types of tunnel boring machine excavation soil are crushed and then screened.

[0066] The sieved fine particles are evenly loaded into a ball mill for grinding. After grinding, the ground product is transferred to a dry container for storage.

[0067] Based on the geological conditions, shield tunneling excavated soil with different fineness moduli was selected as a group and hydrated into mud. Then, the required amount was weighed according to the proportion and mixed for later use.

[0068] The tunnel boring machine excavated soil was divided into excavated soil type 1 and excavated soil type 2. It was classified according to different fineness moduli and the moisture content was adjusted to prepare mud with different properties, thus obtaining tunnel boring machine excavated soil mud one and tunnel boring machine excavated soil mud two for later use.

[0069] 15 parts of the carbide slag, 15 parts of the slag and 19 parts of the fly ash are screened to make the maximum particle size less than 120 μm. The carbide slag, the slag and the fly ash are mixed and stirred to form a uniform mixture I. Mixture I is combined with 1 part of the water-reducing agent and mixed and stirred to obtain mixture II.

[0070] Take 30 parts of shield tunneling slag slurry I and 40 parts of shield tunneling slag slurry II and mix them with mixture II. Stir the mixture at a stirring speed of 600 r / min for at least 165 s to obtain the shield tunneling slag ecological grouting material based on stratum adaptability.

[0071] Example 4:

[0072] This invention proposes an ecological grouting material for shield tunneling excavation soil based on geological adaptability. Its raw materials include (parts by weight): 20 parts of shield tunneling excavation soil slurry one, 50 parts of shield tunneling excavation soil slurry two, 15 parts of calcium carbide slag, 15 parts of blast furnace slag, 19 parts of fly ash, and 1 part of water-reducing agent. Shield tunneling excavation soil slurry one and shield tunneling excavation soil slurry two constitute the different types of shield tunneling slurry.

[0073] The production process of the shield tunneling slag ecological grouting material based on geological adaptability includes the following steps:

[0074] Different types of tunnel boring machine excavation soil are crushed and then screened.

[0075] The sieved fine particles are evenly loaded into a ball mill for grinding. After grinding, the ground product is transferred to a dry container for storage.

[0076] Based on the geological conditions, shield tunneling excavated soil with different fineness moduli was selected as a group and hydrated into mud. Then, the required amount was weighed according to the proportion and mixed for later use.

[0077] The tunnel boring machine excavated soil was divided into excavated soil type 1 and excavated soil type 2. It was classified according to different fineness moduli and the moisture content was adjusted to prepare mud with different properties, thus obtaining tunnel boring machine excavated soil mud one and tunnel boring machine excavated soil mud two for later use.

[0078] 15 parts of the carbide slag, 15 parts of the slag and 19 parts of the fly ash are screened to make the maximum particle size less than 120 μm. The carbide slag, the slag and the fly ash are mixed and stirred to form a uniform mixture I. Mixture I is combined with 1 part of the water-reducing agent and mixed and stirred to obtain mixture II.

[0079] Take 20 parts of shield tunneling slag slurry I and 50 parts of shield tunneling slag slurry II and mix them with mixture II. Stir the mixture at a stirring speed of 650 r / min for at least 170 s to obtain the shield tunneling slag ecological grouting material based on stratum adaptability.

[0080] Example 5:

[0081] This invention proposes an ecological grouting material for shield tunneling excavation soil based on geological adaptability. Its raw materials include (parts by weight): 20 parts of shield tunneling excavation soil slurry one, 50 parts of shield tunneling excavation soil slurry two, 15 parts of calcium carbide slag, 10 parts of slag, 19 parts of fly ash, and 3 parts of water-reducing agent. Shield tunneling excavation soil slurry one and shield tunneling excavation soil slurry two constitute the different types of shield tunneling slurry.

[0082] The production process of the shield tunneling slag ecological grouting material based on geological adaptability includes the following steps:

[0083] Different types of tunnel boring machine excavation soil are crushed and then screened.

[0084] The sieved fine particles are evenly loaded into a ball mill for grinding. After grinding, the ground product is transferred to a dry container for storage.

[0085] Based on the geological conditions, shield tunneling excavated soil with different fineness moduli was selected as a group and hydrated into mud. Then, the required amount was weighed according to the proportion and mixed for later use.

[0086] The tunnel boring machine excavated soil was divided into excavated soil type 1 and excavated soil type 2. It was classified according to different fineness moduli and the moisture content was adjusted to prepare mud with different properties, thus obtaining tunnel boring machine excavated soil mud one and tunnel boring machine excavated soil mud two for later use.

[0087] 15 parts of the carbide slag, 10 parts of the slag and 19 parts of the fly ash are screened to make the maximum particle size less than 120 μm. The carbide slag, the slag and the fly ash are mixed and stirred to form a uniform mixture I. Mixture I is combined with 3 parts of the water-reducing agent and mixed and stirred to obtain mixture II.

[0088] Take 20 parts of shield tunneling slag slurry I and 50 parts of shield tunneling slag slurry II and mix them with mixture II. Stir the mixture at a stirring speed of 700 r / min for at least 180 s to obtain the shield tunneling slag ecological grouting material based on stratum adaptability.

[0089] Comparative Example 1:

[0090] This invention proposes an ecological grouting material for shield tunneling excavation soil based on geological adaptability. Its raw materials include (parts by weight): 70 parts of shield tunneling excavation soil slurry one (slurry specific gravity 1.55), 0 parts of shield tunneling excavation soil slurry two, 10 parts of calcium carbide slag, 10 parts of blast furnace slag, 19 parts of fly ash, and 2 parts of water-reducing agent. Shield tunneling excavation soil slurry one and shield tunneling excavation soil slurry two constitute the different types of shield tunneling slurry.

[0091] The production process of the shield tunneling slag ecological grouting material based on geological adaptability includes the following steps:

[0092] Different types of tunnel boring machine excavation soil are crushed and then screened.

[0093] The sieved fine particles are evenly loaded into a ball mill for grinding. After grinding, the ground product is transferred to a dry container for storage.

[0094] Based on the geological conditions, shield tunneling excavated soil with different fineness moduli was selected as a group and hydrated into mud. Then, the required amount was weighed according to the proportion and mixed for later use.

[0095] The tunnel boring machine excavated soil was divided into excavated soil type 1 and excavated soil type 2. It was classified according to different fineness moduli and the moisture content was adjusted to prepare mud with different properties, thus obtaining tunnel boring machine excavated soil mud one and tunnel boring machine excavated soil mud two for later use.

[0096] Ten parts of the carbide slag, ten parts of the slag, and nineteen parts of the fly ash are sieved to make the maximum particle size less than 120 μm. The carbide slag, the slag, and the fly ash are mixed and stirred to form a uniform mixture I. Mixture I is combined with two parts of the water-reducing agent and stirred to obtain mixture II.

[0097] Take 70 parts of the prepared shield tunneling slag slurry and mix it with mixture II. Stir the mixture at a stirring speed of 550 r / min for at least 150 s to obtain the shield tunneling slag ecological grouting material based on geological adaptability.

[0098] Comparative Example 2:

[0099] This invention proposes an ecological grouting material for shield tunneling excavation soil based on geological adaptability. Its raw materials include (parts by weight): 70 parts of shield tunneling excavation soil slurry one (slurry specific gravity 1.65), 0 parts of shield tunneling excavation soil slurry two, 10 parts of calcium carbide slag, 10 parts of blast furnace slag, 19 parts of fly ash, and 2 parts of water-reducing agent. Shield tunneling excavation soil slurry one and shield tunneling excavation soil slurry two constitute the different types of shield tunneling slurry.

[0100] The production process of the shield tunneling slag ecological grouting material based on geological adaptability includes the following steps:

[0101] Different types of tunnel boring machine excavation soil are crushed and then screened.

[0102] The sieved fine particles are evenly loaded into a ball mill for grinding. After grinding, the ground product is transferred to a dry container for storage.

[0103] Based on the geological conditions, shield tunneling excavated soil with different fineness moduli was selected as a group and hydrated into mud. Then, the required amount was weighed according to the proportion and mixed for later use.

[0104] The tunnel boring machine excavated soil was divided into excavated soil type 1 and excavated soil type 2. It was classified according to different fineness moduli and the moisture content was adjusted to prepare mud with different properties, thus obtaining tunnel boring machine excavated soil mud one and tunnel boring machine excavated soil mud two for later use.

[0105] Ten parts of the carbide slag, ten parts of the slag, and nineteen parts of the fly ash are sieved to make the maximum particle size less than 120 μm. The carbide slag, the slag, and the fly ash are mixed and stirred to form a uniform mixture I. Mixture I is combined with two parts of the water-reducing agent and stirred to obtain mixture II.

[0106] Take 70 parts of the prepared shield tunneling slag slurry and mix it with mixture II. Stir the mixture at a stirring speed of 550 r / min for at least 155 s to obtain the shield tunneling slag ecological grouting material based on geological adaptability.

[0107] Comparative Example 3:

[0108] This invention proposes an ecological grouting material for shield tunneling excavation soil based on geological adaptability. Its raw materials include (parts by weight): 70 parts of shield tunneling excavation soil slurry one (slurry specific gravity 1.75), 0 parts of shield tunneling excavation soil slurry two, 10 parts of calcium carbide slag, 10 parts of blast furnace slag, 19 parts of fly ash, and 2 parts of water-reducing agent. Shield tunneling excavation soil slurry one and shield tunneling excavation soil slurry two constitute the different types of shield tunneling slurry.

[0109] The production process of the shield tunneling slag ecological grouting material based on geological adaptability includes the following steps:

[0110] Different types of tunnel boring machine excavation soil are crushed and then screened.

[0111] The sieved fine particles are evenly loaded into a ball mill for grinding. After grinding, the ground product is transferred to a dry container for storage.

[0112] Based on the geological conditions, shield tunneling excavated soil with different fineness moduli was selected as a group and hydrated into mud. Then, the required amount was weighed according to the proportion and mixed for later use.

[0113] The tunnel boring machine excavated soil was divided into excavated soil type 1 and excavated soil type 2. It was classified according to different fineness moduli and the moisture content was adjusted to prepare mud with different properties, thus obtaining tunnel boring machine excavated soil mud one and tunnel boring machine excavated soil mud two for later use.

[0114] Ten parts of the carbide slag, ten parts of the slag, and nineteen parts of the fly ash are sieved to make the maximum particle size less than 120 μm. The carbide slag, the slag, and the fly ash are mixed and stirred to form a uniform mixture I. Mixture I is combined with two parts of the water-reducing agent and stirred to obtain mixture II.

[0115] Take 70 parts of the prepared shield tunneling slag slurry and mix it with mixture II. Stir the mixture at a stirring speed of 600 r / min for at least 165 s to obtain the shield tunneling slag ecological grouting material based on geological adaptability.

[0116] Comparative Example 4:

[0117] This invention proposes an ecological grouting material for shield tunneling excavation soil based on geological adaptability. Its raw materials include (parts by weight): 0 parts of shield tunneling excavation soil slurry one, 70 parts of shield tunneling excavation soil slurry two (slurry specific gravity 1.55), 10 parts of calcium carbide slag, 10 parts of blast furnace slag, 19 parts of fly ash, and 2 parts of water-reducing agent. Shield tunneling excavation soil slurry one and shield tunneling excavation soil slurry two constitute the different types of shield tunneling slurry.

[0118] The production process of the shield tunneling slag ecological grouting material based on geological adaptability includes the following steps:

[0119] Different types of tunnel boring machine excavation soil are crushed and then screened.

[0120] The sieved fine particles are evenly loaded into a ball mill for grinding. After grinding, the ground product is transferred to a dry container for storage.

[0121] Based on the geological conditions, shield tunneling excavated soil with different fineness moduli was selected as a group and hydrated into mud. Then, the required amount was weighed according to the proportion and mixed for later use.

[0122] The tunnel boring machine excavated soil was divided into excavated soil type 1 and excavated soil type 2. It was classified according to different fineness moduli and the moisture content was adjusted to prepare mud with different properties, thus obtaining tunnel boring machine excavated soil mud one and tunnel boring machine excavated soil mud two for later use.

[0123] Ten parts of the carbide slag, ten parts of the slag, and nineteen parts of the fly ash are sieved to make the maximum particle size less than 120 μm. The carbide slag, the slag, and the fly ash are mixed and stirred to form a uniform mixture I. Mixture I is combined with two parts of the water-reducing agent and stirred to obtain mixture II.

[0124] Take 70 parts of the prepared shield tunneling slag slurry II and mix it with mixture II. Stir the mixture at a stirring speed of 650 r / min for at least 170 s to obtain the shield tunneling slag ecological grouting material based on stratum adaptability.

[0125] Comparative Example 5:

[0126] This invention proposes an ecological grouting material for shield tunneling excavated soil based on geological adaptability. Its raw materials include (parts by weight): 0 parts of shield tunneling excavated soil slurry one, 70 parts of shield tunneling excavated soil slurry two (slurry specific gravity 1.65), 10 parts of calcium carbide slag, 10 parts of blast furnace slag, 19 parts of fly ash, and 2 parts of water-reducing agent. Shield tunneling excavated soil slurry one and shield tunneling excavated soil slurry two constitute the different types of shield tunneling slurries.

[0127] The production process of the shield tunneling slag ecological grouting material based on geological adaptability includes the following steps:

[0128] Different types of tunnel boring machine excavation soil are crushed and then screened.

[0129] The sieved fine particles are evenly loaded into a ball mill for grinding. After grinding, the ground product is transferred to a dry container for storage.

[0130] Based on the geological conditions, shield tunneling excavated soil with different fineness moduli was selected as a group and hydrated into mud. Then, the required amount was weighed according to the proportion and mixed for later use.

[0131] The tunnel boring machine excavated soil was divided into excavated soil type 1 and excavated soil type 2. It was classified according to different fineness moduli and the moisture content was adjusted to prepare mud with different properties, thus obtaining tunnel boring machine excavated soil mud one and tunnel boring machine excavated soil mud two for later use.

[0132] Ten parts of the carbide slag, ten parts of the slag, and nineteen parts of the fly ash are sieved to make the maximum particle size less than 120 μm. The carbide slag, the slag, and the fly ash are mixed and stirred to form a uniform mixture I. Mixture I is combined with two parts of the water-reducing agent and stirred to obtain mixture II.

[0133] Take 70 parts of the prepared shield tunneling slag slurry II and mix it with mixture II. Stir the mixture at a stirring speed of 700 r / min for at least 180 s to obtain the shield tunneling slag ecological grouting material based on geological adaptability.

[0134] Verification example:

[0135] To verify the performance of the ecological grouting materials based on tunnel boring machine excavation obtained in the above embodiments and comparative examples, the following experiments were conducted:

[0136] The weight of 1L of grout was measured using an electronic scale with a capacity exceeding 3kg, achieving an accuracy of 0.1g. According to the "Technical Specification for Application of Synchronous Grouting Materials in Shield Tunneling Method" (T / CECS 563-2018), the calculated weight-to-volume ratio is the apparent density of the grouting material.

[0137] Pour in the grouting material, ensuring it is approximately 10 mm below the rim of the container. Tamp the grout 25 times with a tamping rod, and gently shake or tap the container 5 to 6 times to smooth the grout surface. Place the container on the consistency tester base, lower the test cone to the grout surface, and lock the slide bar. Zero the reading. Release the lock and allow the test cone to sink freely in the grout for 10 seconds. Record the sinking distance; this is the consistency value of the grouting material.

[0138] Pour the prepared grouting material into the measuring container, ensuring the grout level is 10 mm below the container opening. Gently tap the edge of the container to level the grout surface and tighten the lid. Place the container in an environment of 20±2℃ to allow it to stand. Then, place the container on a device with a pressure indicator and adjust the screw so that the probe lightly touches the grout surface. Rotate the screw to set the probe depth to 25 mm and lock it in place. Start timing the setting time from the beginning of water addition and stirring, measuring the probe pressure resistance every 30 minutes. When the probe resistance reaches 0.3 MPa, measure every 15 minutes until the resistance value rises to 0.7 MPa.

[0139] Place a 250mL graduated cylinder on a flat surface and pour in 250mL of synchronous grouting material. After waiting for 1 minute, immediately measure and record the initial scale value of the grout level, and then seal the graduated cylinder. Three hours later, measure the scale values ​​a1 and a2 corresponding to the bleeding surface and the grout surface, and calculate the bleeding rate according to the following formula:

[0140] BR 3h =a 1 -a 2 ×100%

[0141] a0

[0142] Where BR3h represents the bleeding rate after three hours, accurate to 0.1%; a0 is the initial scale value of the slurry surface; a1 and a2 are the scale values ​​of the bleeding layer and the slurry surface after three hours, respectively. After three days, the scale value a3 corresponding to the hardened slurry surface is measured, and the stone formation rate is calculated according to the following formula:

[0143]

[0144] HR3 represents the stone formation rate after three days, accurate to 0.1%; a3 is the scale value of the hardened slurry surface after three days.

[0145] The prepared slurry was poured into a cubic mold with sides of 70.7 mm, placed in a laboratory at 20°C, and allowed to stand for 24 hours before demolding. The mold was then transferred to a curing room and cured at 20°C and 99% relative humidity until the standard age was reached, after which compressive strength testing was performed. The compressive strength was tested according to GB / T 17671-1999, "Test Method for Strength of Cement Mortar (ISO Method)".

[0146] A cubic mold with sides of 70.7 mm was placed in a water tank, and water was poured in to a depth of at least 10 mm above the mold surface. Grout was slowly poured in using a funnel, ensuring the mold was completely filled, and the mold was allowed to stand for 5 to 10 minutes. The sides of the mold were tapped to remove any adhering water, and then the mold was immersed in water again for curing. After 3 days of curing, the mold was removed, and the mold was allowed to cure in water for up to 28 days, maintaining a water temperature of 20℃±3℃. Finally, the compressive strength was determined using the same testing method and equipment. The water-to-land strength ratio was calculated as follows:

[0147]

[0148] Where SR represents the water-to-land strength ratio, SW is the 28-day compressive strength of the specimen cured in water, and Sa is the 28-day compressive strength of the specimen cured in air.

[0149] The experimental results are shown in Table 1 below:

[0150] Table 1 Experimental Results

[0151]

[0152]

[0153] As can be seen from the results in the table above, the grout obtained in each embodiment of the present invention can effectively meet the general performance requirements for synchronous grouting of tunnel shields, and has high compressive strength and high water-to-land strength ratio.

[0154] Application example:

[0155] As can be seen from the above experiments, the shield tunneling slag ecological grouting material based on geological adaptability of the present invention has excellent performance. It can be used in tunnel shield engineering to fill the gap between the tunnel lining and the surrounding soil, and to carry out synchronous grouting filling and reinforcement.

[0156] During the grouting process applied in the study area, the tunneling parameters of the tunnel boring machine (TBM) were recorded every 5 meters. These parameters included earth pressure, thrust, torque, soil removal, tunneling speed, and the pressure and volume of synchronous grouting. For the TBM ecological grouting fluid, the initial grouting pressure was set between 0.2 and 0.4 MPa, with a grouting ratio of approximately 1.5. The grouting pressure and volume were adjusted according to the actual tunneling conditions to ensure optimal grouting results.

[0157] Test results show that the ecological grouting material has a compressive strength of 1.4 MPa, excellent bonding performance, and a maximum water-to-land strength ratio of 71%, meeting the requirements for engineering applications. When applied to subway shield tunnels, the final settlement of the two monitoring sections remained at approximately 20 mm. Compared to the approximately 25 mm ground settlement when using existing commercial grout, the effect of the shield tunnel ecological synchronous grouting material is more significant.

[0158] The above description discloses only one preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. Those skilled in the art will understand that all or part of the processes of the above embodiments can be implemented, and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A production process of a shield muck ecological grouting material based on stratum adaptability, characterized in that, the ecological grouting material is made of raw materials in the following weight parts: 70 parts of different kinds of shield muck, 15 parts of calcium carbide slag, 10-15 parts of slag, 19 parts of fly ash and 1-3 parts of water reducing agent, wherein the water amount meets the muck specific gravity range of 1.55-1.75; the shield muck is composed of shield muck slurry one and shield muck slurry two, the fineness modulus of shield muck in the shield muck slurry one and the shield muck slurry two is different, 20 parts of shield muck slurry one and 50 parts of shield muck slurry two; the shield muck is waste muck produced by different tunnels and underground shield engineering; the fly ash is grade II ash, the water reducing agent is early strength type water reducing agent, the calcium carbide slag is fine particle calcium carbide slag, and the slag is water quenched slag; the production process comprises the following steps: S1: after the different kinds of shield muck are crushed, screening is performed; S2: the fine particle materials after screening are uniformly loaded into a ball mill for centralized grinding, and the grinding product is transferred to a drying container for storage after grinding is completed; S3: different fineness modulus shield mucks are selected according to stratum conditions; S4: classification is performed according to different fineness modulus, the shield muck is divided into muck 1 and muck 2, water is added to the muck 1 for slaking, and the water content is adjusted to prepare muck one and muck two with different muck specific gravities, and a mixture of the muck one is obtained, water is added to the muck 2 for slaking, and the water content is adjusted to prepare muck three and muck four with different muck specific gravities, and a mixture of the muck two is obtained; S5: the calcium carbide slag, the slag and the fly ash are screened to make the maximum particle size less than 120 μm, the calcium carbide slag, the slag and the fly ash are mixed and stirred to form a uniform mixture I, the mixture I is combined with the water reducing agent for mixing and stirring to obtain a mixture II; S6: the mixture II, the shield muck slurry one and the shield muck slurry two are mixed and stirred to obtain the shield muck ecological grouting material based on stratum adaptability; in step S1, in the screening process, according to stratum conditions, the shield muck needs to be classified into shield muck I, shield muck II, shield muck III, shield muck IV and shield muck V, wherein the fineness modulus of the shield muck I is 4.6-3.8, the fineness modulus of the shield muck II is 3.7-3.1, the fineness modulus of the shield muck III is 3.0-2.3, the fineness modulus of the shield muck IV is 2.2-1.6, and the fineness modulus of the shield muck V is 1.5-0.7, and the particle size of the shield muck after screening needs to be less than 3 mm; the combination of the fineness modulus III and the fineness modulus IV is suitable for sandy and clay composite stratum; the combination of the fineness modulus IV and the fineness modulus V is suitable for silty clay stratum; the mixture of the fineness modulus II and the fineness modulus III can be effectively applied to the upper soft and lower hard stratum; the combination of the fineness modulus I and the fineness modulus II is suitable for medium coarse sand and granite mixed stratum.

2. The process for producing a shield muck eco-grouting material based on stratum adaptability according to claim 1, characterized in that, In step S2, the feeding ratio of the ball mill is 1:10, that is, about 1000 kg of grinding balls are added for every 100 kg of material. The grinding balls are made of a material with good wear resistance and have a diameter of 10-15 mm. The grinding speed is set to 300-400 RPM, and the grinding time is initially set to 3 hours, which can be extended to 5 hours depending on the real-time particle size changes.

3. The process for producing a shield muck eco-grouting material based on stratum adaptability according to claim 2, characterized in that, In step S2, during the grinding process, the temperature in the ball mill is controlled below 60°C, and sampling is performed every hour. The D50 value is detected using a particle size analyzer, and the target is D50 < 20 μm.

4. The process for producing a shield muck eco-grouting material based on stratum adaptability according to claim 3, characterized in that, In step S5, the mixing and stirring conditions of the mixture of the carbide slag, the slag, and the fly ash are as follows: the mixing and stirring rate is set to 200-300 r / min, and the mixing and stirring time is set to 2-3 minutes.

5. The process for producing a shield muck eco-grouting material based on stratum adaptability according to claim 4, characterized in that, In step S5, the mixing and stirring conditions of the mixture I combined with the water reducing agent are as follows: the mixing and stirring rate is set to 200-300 r / min, and the mixing and stirring time is set to 2-3 minutes.

6. The process for producing a shield muck eco-grouting material based on stratum adaptability according to claim 5, characterized in that, In step S6, the mixing and stirring conditions are as follows: the mixing and stirring rate is set to 550-700 r / min, and the mixing and stirring time is set to 150-180 seconds.

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