Shield muck ecological grouting material based on stratum adaptability and production process

Abstract

The invention relates to the technical field of tunnel and underground engineering shield grouting, in particular to a shield muck ecological grouting material based on stratum adaptability and a production process, the ecological grouting material is prepared from shield muck subjected to fineness modulus classification, carbide slag, slag, fly ash and a water reducing agent, according to the technical scheme, the preparation technology of muck crushing, preliminary screening, grinding, fineness screening, hydrolyzed mud adding and grouping mixing and the ecological grouting material for different stratum adaptability are formed, and the prepared ecological grouting material has the dual advantages of being environmentally friendly and considering the stratum adaptability; the ecological grouting material has the advantages of large apparent density, low bleeding rate, high compressive strength, good water-land strength ratio and the like, is mainly applied to shield tunnel wall back grouting of tunnels and underground engineering, and is mainly used for enhancing soil layer stability and guaranteeing safety of ground buildings.

Description

Technical Field

[0001] The invention relates to the technical field of shield grouting for tunnels and underground engineering, and in particular to a shield slag ecological grouting material and a production process based on stratum adaptability. Background Art

[0002] In the planning and construction of modern cities, underground tunnels are an important part of infrastructure such as transportation and water conservancy. The construction of underground tunnels requires a lot of engineering construction, and shield technology has gradually become the main construction method for underground tunnel projects because of its high efficiency and safety. However, a large amount of slag will be generated during the construction of the shield machine, and its physical properties and chemical composition are closely related to the characteristics of the stratum. It usually includes soil particles, rock debris, organic matter and other components, with complex composition and difficult to handle. How to effectively handle the slag has become an urgent problem to be solved in shield tunnel projects.

[0003] Therefore, it is proposed in the prior art to use shield slag as the main raw material to prepare grouting materials, so as to realize the treatment of shield slag. However, since the fineness modulus of shield slag has a significant influence on its physical and mechanical properties, even for the same type of soil, the difference in fineness modulus will lead to large differences in its engineering properties. During the excavation process of the shield machine, facing a variety of geological environments, different geological conditions put forward specific requirements for grouting materials. However, the current shield slag grouting materials do not fully consider the problem of stratum adaptability, resulting in its practicality being limited and it is difficult to achieve the expected effect. Summary of the invention

[0004] The purpose of the present invention is to provide a shield slag ecological grouting material and production process based on stratum adaptability, so as to solve the problem that the current shield slag grouting material does not fully consider the stratum adaptability problem, resulting in its practicality being limited and it is difficult to achieve the expected effect.

[0005] To achieve the above-mentioned purpose, the present invention provides a shield slag ecological grouting material and production process based on stratum adaptability. The shield slag ecological grouting material based on stratum adaptability is made of the following raw materials in parts by weight: 50-70 parts of different types of shield mud, 10-15 parts of carbide slag, 10-15 parts of slag, 5-10 parts of fly ash and 1-3 parts of water reducer, wherein the amount of water used meets the mud specific gravity range of 1.55-1.75.

[0006] The different types of shield slag are waste slag generated by different tunnels and underground shield projects.

[0007] Among them, the fly ash is Class II ash, the water reducer is an early strength type water reducer, the carbide slag is fine-particle carbide slag, and the slag is water-quenched slag.

[0008] The present invention also provides a production process of shield slag ecological grouting material based on stratum adaptability, which is applied to the shield slag ecological grouting material based on stratum adaptability as described above, and comprises the following steps:

[0009] S1: crush different types of shield waste separately and then screen them;

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

[0011] S3: According to the ground conditions, shield slag with different fineness modulus is selected as a group and hydrolyzed mud is added, and then the required number of portions is weighed according to the proportion and mixed for later use;

[0012] S4: Classify the shield slag components after adding hydrolyzed mud into slag type 1 and slag type 2 according to different fineness moduli, and adjust the moisture content to prepare slurries with different properties, so as to obtain shield slag slurry 1 and shield slag slurry 2 for standby use;

[0013] S5: screening the carbide slag, the slag and the fly ash to make their maximum particle size less than 120 μm, mixing and stirring the carbide slag, the slag and the fly ash to form a uniform mixture I, combining the mixture I with the water reducing agent and mixing and stirring to obtain a mixture II;

[0014] S6: Mixing and stirring the mixture II, shield slag slurry 1 and shield slag slurry 2 to obtain the shield slag ecological grouting material based on stratum adaptability.

[0015] Among them, in step S1, during the screening process, the shield slag needs to be classified into shield slag I, shield slag II, shield slag III, shield slag IV, and shield slag V, wherein the fineness modulus of shield slag I is 4.6-3.8, the fineness modulus of shield slag II is 3.7-3.1, the fineness modulus of shield slag III is 3.0-2.3, the fineness modulus of shield slag IV is 2.2-1.6, and the fineness modulus of shield slag V is 1.5-0.7, and the particle size of the shield slag after screening needs to be less than 3 mm.

[0016] Among them, in step S2, the feeding ratio of the ball mill is 1:10, that is, about 1000kg of grinding balls are required for every 100kg of material. The grinding balls are selected with a diameter of 10-15mm and good wear resistance. The grinding speed is set to 300-400RPM, 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] Wherein, in step S2, during the grinding process, the temperature in the ball mill is controlled below 60°C, and sampling is performed every hour, and a particle size analyzer is used to detect the D50 value, with the target being D50<20μm.

[0018] Wherein, in step S5, the mixing and stirring conditions of the carbide slag, the slag and the fly ash are: the mixing and stirring rate is set to 200-300r / min, and the mixing and stirring time is set to 2 to 3 minutes.

[0019] Wherein, in step S5, the conditions for mixing and stirring the mixture I and 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.

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

[0021] The present invention discloses an ecological grouting material and production process of shield slag based on stratum adaptability, comprising 50-70 parts of different types of shield mud, 10-15 parts of carbide slag, 10-15 parts of slag, 5-10 parts of fly ash and 1-3 parts of water reducer. The ecological grouting material is prepared from shield slag, carbide slag, slag, fly ash and water reducer classified by fineness modulus. The technical scheme forms a preparation process of slag-crushing-preliminary screening-grinding-fineness screening-hydrolysis mud-group mixing and ecological grouting materials for different stratum adaptability. The prepared ecological grouting material has the dual advantages of being green and environmentally friendly and taking into account stratum adaptability. At the same time, the ecological grouting material has many advantages such as large apparent density, low water seepage rate, high compressive strength and good water-land strength ratio. The material is mainly used for grouting behind the shield tunnel wall of tunnels and underground projects, and is mainly used to enhance soil stability and ensure the safety of ground buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a process flow chart of the production process of shield slag ecological grouting material based on stratum adaptability provided by the present invention. DETAILED DESCRIPTION

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

[0025] The present invention provides a shield slag ecological grouting material based on stratum adaptability, which is made of the following raw materials in parts by weight: 50-70 parts of different types of shield mud, 10-15 parts of carbide slag, 10-15 parts of slag, 5-10 parts of fly ash and 1-3 parts of water reducer, wherein the amount of water used satisfies the mud specific gravity range of 1.55-1.75.

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

[0027] In this embodiment, by using the different types of industrial by-products such as shield slag, carbide slag, slag and fly ash as raw materials, the pollution of waste to the environment is reduced, and the demand for the exploitation of natural resources is reduced, and the recycling of resources is achieved. The prepared grouting material has a low water seepage rate, which reduces the waste of water resources during the construction process, and its components are environmentally friendly, which greatly reduces the negative impact on the environment. The use of this ecological grouting material in tunnels and underground projects can not only ensure the quality of the project, but also effectively reduce the interference with the surrounding ecological environment during the construction process, thereby improving the sustainability of the project.

[0028] See also Figure 1 The present invention also provides a production process of shield slag ecological grouting material based on stratum adaptability, which is applied to the shield slag ecological grouting material based on stratum adaptability as described above, and comprises the following steps:

[0029] S1: crush different types of shield waste separately and then screen them;

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

[0031] S3: According to the ground conditions, shield slag with different fineness modulus is selected as a group and hydrolyzed mud is added, and then the required number of portions is weighed according to the proportion and mixed for later use;

[0032] S4: Classify the shield slag components after adding hydrolyzed mud into slag type 1 and slag type 2 according to different fineness moduli, and adjust the moisture content to prepare slurries with different properties, so as to obtain shield slag slurry 1 and shield slag slurry 2 for standby use;

[0033] S5: screening the carbide slag, the slag and the fly ash to make their maximum particle size less than 120 μm, mixing and stirring the carbide slag, the slag and the fly ash to form a uniform mixture I, combining the mixture I with the water reducing agent and mixing and stirring to obtain a mixture II;

[0034] S6: Mixing and stirring the mixture II, shield slag slurry 1 and shield slag slurry 2 to obtain the shield slag ecological grouting material based on stratum adaptability.

[0035] Preferably, in step S1, during the screening process, the shield slag needs to be classified into shield slag I, shield slag II, shield slag III, shield slag IV, and shield slag V, wherein the fineness modulus of shield slag I is 4.6-3.8, the fineness modulus of shield slag II is 3.7-3.1, the fineness modulus of shield slag III is 3.0-2.3, the fineness modulus of shield slag IV is 2.2-1.6, the fineness modulus of shield slag V is 1.5-0.7, and the particle size of the shield slag after screening needs to 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 are required for every 100 kg of material, and the grinding balls are selected from grinding balls 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 in the ball mill is controlled below 60°C, and sampling is performed every hour, and a particle size analyzer is used to detect the D50 value, with the goal of D50<20 μm.

[0038] Preferably, in step S4, shield slag slurry 1 and shield slag slurry 2 together constitute the different types of shield slurries.

[0039] Preferably, in step S5, the mixing and stirring conditions of the carbide slag, the slag and the fly ash 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.

[0040] Preferably, in step S5, the conditions for mixing and stirring the mixture I and 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 conditions for mixing and stirring the mixture II and the composite mud mixture are: the mixing and stirring rate is set to 550-700 r / min, and the mixing and stirring time is set to 150 to 180 seconds.

[0042] Preferably, the adaptability classification of the strata is carried out according to different geological conditions, and the strata conditions can be divided into the following types: sand-clay composite strata, silty clay strata, upper soft and lower hard strata, and medium-coarse sand and granite mixed strata. For the adaptability evaluation of various strata, the selection of fineness modulus is considered to be 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 combination of fineness modulus II and fineness modulus III can be effectively applied to upper soft and lower hard strata; and the combination of fineness modulus I and fineness modulus II is suitable for medium-coarse sand and granite mixed strata.

[0043] In this embodiment, the ecological grouting material of this technical solution achieves adaptability optimization for different formation conditions by combining different components (such as the different types of shield mud, the calcium carbide slag, the slag and the fly ash). By controlling the fineness modulus of the material, the grouting material can effectively fill the soil layers with different structures and pores, thereby improving the construction efficiency of the project and the use effect of the material. The prepared grouting material has high compressive strength and excellent water-to-land strength ratio, which can effectively enhance the stability of the soil layer in the injection area, reduce the risks caused by the unevenness of the soil layer, and ensure the safety of the ground and surrounding buildings. According to the characteristics of the stratum, the material ratio and processing technology can be adjusted to flexibly respond to complex geological conditions and ensure effectiveness in various environments. By using the different types of industrial by-products such as shield slag, carbide slag, slag and fly ash as raw materials, the pollution of waste to the environment is reduced, and the demand for mining of natural resources is reduced, and the recycling of resources is realized. The prepared grouting material has a low water seepage rate, which reduces the waste of water resources during construction. Its ingredients are environmentally friendly and greatly reduce the negative impact on the environment. The use of this ecological grouting material in tunnels and underground projects can not only ensure the quality of the project, but also effectively reduce the interference with the surrounding ecological environment during the construction process, thereby improving the sustainability of the project.

[0044] Embodiment 1:

[0045] The present invention proposes a shield slag ecological grouting material based on stratum adaptability, and its raw materials include (by weight): 40 parts of shield slag mud one, 30 parts of shield slag mud two, 10 parts of calcium carbide slag, 10 parts of slag, 19 parts of fly ash and 1 part of water reducing agent. Shield slag mud one and shield slag mud two constitute the different types of shield muds.

[0046] The production process of shield slag ecological grouting material based on stratum adaptability comprises the following steps:

[0047] After crushing different types of shield slag separately, they are screened;

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

[0049] According to the ground conditions, shield slag with different fineness modulus is selected as a group and hydrolyzed mud is added, and then the required number of portions is weighed according to the proportion and mixed for later use;

[0050] The shield slag is divided into slag type 1 and slag type 2, classified according to different fineness moduli, and the water content is adjusted to prepare slurries with different properties, and shield slag slurry 1 and shield slag slurry 2 are obtained for standby use;

[0051] 10 parts of the carbide slag, 10 parts of the slag and 19 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, and the mixture I is combined with 1 part of the water reducing agent and mixed and stirred to obtain a mixture II;

[0052] 40 parts of the prepared shield slag slurry 1 and 30 parts of the prepared shield slag slurry 2 are mixed and stirred with mixture II, and the mixture is stirred at a stirring speed of 550 r / min for at least 150 s to obtain the shield slag ecological grouting material based on stratum adaptability.

[0053] Embodiment 2:

[0054] The present invention proposes a shield slag ecological grouting material based on stratum adaptability, and its raw materials include (by weight): 50 parts of shield slag mud one, 10 parts of shield slag mud two, 15 parts of calcium carbide slag, 10 parts of slag, 19 parts of fly ash and 1 part of water reducing agent. Shield slag mud one and shield slag mud two constitute the different types of shield muds.

[0055] The production process of shield slag ecological grouting material based on stratum adaptability comprises the following steps:

[0056] After crushing different types of shield slag separately, they are screened;

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

[0058] According to the ground conditions, shield slag with different fineness modulus is selected as a group and hydrolyzed mud is added, and then the required number of portions is weighed according to the proportion and mixed for later use;

[0059] The shield slag is divided into slag type 1 and slag type 2, classified according to different fineness moduli, and the water content is adjusted to prepare slurries with different properties, and shield slag slurry 1 and shield slag slurry 2 are obtained for standby use;

[0060] 15 parts of the carbide slag, 10 parts of the slag and 19 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, and the mixture I is combined with 1 part of the water reducing agent and mixed and stirred to obtain a mixture II;

[0061] 50 parts of the prepared shield slag slurry 1 and 10 parts of the prepared shield slag slurry 2 are mixed and stirred with mixture II, and the mixture is stirred at a stirring speed of 550 r / min for at least 155 seconds to obtain the shield slag ecological grouting material based on stratum adaptability.

[0062] Embodiment 3:

[0063] The present invention proposes a shield slag ecological grouting material based on stratum adaptability, and its raw materials include (by weight): 30 parts of shield slag mud one, 40 parts of shield slag mud two, 15 parts of calcium carbide slag, 15 parts of slag, 19 parts of fly ash and 1 part of water reducing agent. Shield slag mud one and shield slag mud two constitute the different types of shield muds.

[0064] The production process of shield slag ecological grouting material based on stratum adaptability comprises the following steps:

[0065] After crushing different types of shield slag separately, they are screened;

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

[0067] According to the ground conditions, shield slag with different fineness modulus is selected as a group and hydrolyzed mud is added, and then the required number of portions is weighed according to the proportion and mixed for later use;

[0068] The shield slag is divided into slag type 1 and slag type 2, classified according to different fineness moduli, and the water content is adjusted to prepare slurries with different properties, and shield slag slurry 1 and shield slag slurry 2 are obtained for standby use;

[0069] 15 parts of the carbide slag, 15 parts of the slag and 19 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, and the mixture I is combined with 1 part of the water reducing agent and mixed and stirred to obtain a mixture II;

[0070] 30 parts of the prepared shield slag slurry 1 and 40 parts of the prepared shield slag slurry 2 are mixed and stirred with mixture II, and the mixture is stirred at a stirring speed of 600 r / min for at least 165 s to obtain the shield slag ecological grouting material based on stratum adaptability.

[0071] Embodiment 4:

[0072] The present invention proposes a shield slag ecological grouting material based on stratum adaptability, and its raw materials include (by weight): 20 parts of shield slag mud one, 50 parts of shield slag mud two, 15 parts of calcium carbide slag, 15 parts of slag, 19 parts of fly ash and 1 part of water reducing agent. Shield slag mud one and shield slag mud two constitute the different types of shield muds.

[0073] The production process of shield slag ecological grouting material based on stratum adaptability comprises the following steps:

[0074] After crushing different types of shield slag separately, they are screened;

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

[0076] According to the ground conditions, shield slag with different fineness modulus is selected as a group and hydrolyzed mud is added, and then the required number of portions is weighed according to the proportion and mixed for later use;

[0077] The shield slag is divided into slag type 1 and slag type 2, classified according to different fineness moduli, and the water content is adjusted to prepare slurries with different properties, and shield slag slurry 1 and shield slag slurry 2 are obtained for standby use;

[0078] 15 parts of the carbide slag, 15 parts of the slag and 19 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, and the mixture I is combined with 1 part of the water reducing agent and mixed and stirred to obtain a mixture II;

[0079] 20 parts of the prepared shield slag slurry 1 and 50 parts of the prepared shield slag slurry 2 are mixed with mixture II and stirred. The mixture is stirred at a stirring speed of 650 r / min for at least 170 s to obtain the shield slag ecological grouting material based on stratum adaptability.

[0080] Embodiment 5:

[0081] The present invention proposes a shield slag ecological grouting material based on stratum adaptability, and its raw materials include (by weight): 20 parts of shield slag mud one, 50 parts of shield slag mud two, 15 parts of calcium carbide slag, 10 parts of slag, 19 parts of fly ash and 3 parts of water reducer. Shield slag mud one and shield slag mud two constitute the different types of shield mud.

[0082] The production process of shield slag ecological grouting material based on stratum adaptability comprises the following steps:

[0083] After crushing different types of shield slag separately, they are screened;

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

[0085] According to the ground conditions, shield slag with different fineness modulus is selected as a group and hydrolyzed mud is added, and then the required number of portions is weighed according to the proportion and mixed for later use;

[0086] The shield slag is divided into slag type 1 and slag type 2, classified according to different fineness moduli, and the water content is adjusted to prepare slurries with different properties, and shield slag slurry 1 and shield slag slurry 2 are obtained for standby use;

[0087] 15 parts of the carbide slag, 10 parts of the slag and 19 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, and the mixture I is combined with 3 parts of the water reducing agent and mixed and stirred to obtain a mixture II;

[0088] 20 parts of the prepared shield slag slurry 1 and 50 parts of the prepared shield slag slurry 2 are mixed and stirred with mixture II, and the mixture is stirred at a stirring speed of 700 r / min for at least 180 s to obtain the shield slag ecological grouting material based on stratum adaptability.

[0089] Comparative Example 1:

[0090] The present invention proposes a shield slag ecological grouting material based on stratum adaptability, and its raw materials include (parts by weight): 70 parts of shield slag mud one (mud specific gravity 1.55), 0 parts of shield slag mud two, 10 parts of calcium carbide slag, 10 parts of slag, 19 parts of fly ash and 2 parts of water reducing agent. Shield slag mud one and shield slag mud two constitute the different types of shield muds.

[0091] The production process of shield slag ecological grouting material based on stratum adaptability comprises the following steps:

[0092] After crushing different types of shield slag separately, they are screened;

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

[0094] According to the ground conditions, shield slag with different fineness modulus is selected as a group and hydrolyzed mud is added, and then the required number of portions is weighed according to the proportion and mixed for later use;

[0095] The shield slag is divided into slag type 1 and slag type 2, classified according to different fineness moduli, and the water content is adjusted to prepare slurries with different properties, and shield slag slurry 1 and shield slag slurry 2 are obtained for standby use;

[0096] 10 parts of the carbide slag, 10 parts of the slag and 19 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, and the mixture I is combined with 2 parts of the water reducing agent and mixed and stirred to obtain a mixture II;

[0097] 70 parts of the prepared shield slag slurry I are mixed with mixture II and stirred, and the mixture is stirred at a stirring speed of 550 r / min for at least 150 s to obtain the shield slag ecological grouting material based on stratum adaptability.

[0098] Comparative Example 2:

[0099] The present invention proposes a shield slag ecological grouting material based on stratum adaptability, and its raw materials include (by weight): 70 parts of shield slag mud one (mud specific gravity 1.65), 0 parts of shield slag mud two, 10 parts of calcium carbide slag, 10 parts of slag, 19 parts of fly ash and 2 parts of water reducer. Shield slag mud one and shield slag mud two constitute the different types of shield muds.

[0100] The production process of shield slag ecological grouting material based on stratum adaptability comprises the following steps:

[0101] After crushing different types of shield slag separately, they are screened;

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

[0103] According to the ground conditions, shield slag with different fineness modulus is selected as a group and hydrolyzed mud is added, and then the required number of portions is weighed according to the proportion and mixed for later use;

[0104] The shield slag is divided into slag type 1 and slag type 2, classified according to different fineness moduli, and the water content is adjusted to prepare slurries with different properties, and shield slag slurry 1 and shield slag slurry 2 are obtained for standby use;

[0105] 10 parts of the carbide slag, 10 parts of the slag and 19 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, and the mixture I is combined with 2 parts of the water reducing agent and mixed and stirred to obtain a mixture II;

[0106] 70 parts of the prepared shield slag slurry I are mixed with mixture II and stirred, and the mixture is stirred at a stirring speed of 550 r / min for at least 155 seconds to obtain the shield slag ecological grouting material based on stratum adaptability.

[0107] Comparative Example 3:

[0108] The present invention proposes a shield slag ecological grouting material based on stratum adaptability, and its raw materials include (parts by weight): 70 parts of shield slag mud one (mud specific gravity 1.75), 0 parts of shield slag mud two, 10 parts of calcium carbide slag, 10 parts of slag, 19 parts of fly ash and 2 parts of water reducing agent. Shield slag mud one and shield slag mud two constitute the different types of shield muds.

[0109] The production process of shield slag ecological grouting material based on stratum adaptability comprises the following steps:

[0110] After crushing different types of shield slag separately, they are screened;

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

[0112] According to the ground conditions, shield slag with different fineness modulus is selected as a group and hydrolyzed mud is added, and then the required number of portions is weighed according to the proportion and mixed for later use;

[0113] The shield slag is divided into slag type 1 and slag type 2, classified according to different fineness moduli, and the water content is adjusted to prepare slurries with different properties, and shield slag slurry 1 and shield slag slurry 2 are obtained for standby use;

[0114] 10 parts of the carbide slag, 10 parts of the slag and 19 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, and the mixture I is combined with 2 parts of the water reducing agent and mixed and stirred to obtain a mixture II;

[0115] 70 parts of the prepared shield slag slurry I are mixed with mixture II and stirred, and the mixture is stirred at a stirring speed of 600 r / min for at least 165 seconds to obtain the shield slag ecological grouting material based on stratum adaptability.

[0116] Comparative Example 4:

[0117] The present invention proposes a shield slag ecological grouting material based on stratum adaptability, and its raw materials include (parts by weight): 0 parts of shield slag mud one, 70 parts of shield slag mud two (mud specific gravity 1.55), 10 parts of calcium carbide slag, 10 parts of slag, 19 parts of fly ash and 2 parts of water reducing agent. Shield slag mud one and shield slag mud two constitute the different types of shield muds.

[0118] The production process of shield slag ecological grouting material based on stratum adaptability comprises the following steps:

[0119] After crushing different types of shield slag separately, they are screened;

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

[0121] According to the ground conditions, shield slag with different fineness modulus is selected as a group and hydrolyzed mud is added, and then the required number of portions is weighed according to the proportion and mixed for later use;

[0122] The shield slag is divided into slag type 1 and slag type 2, classified according to different fineness moduli, and the water content is adjusted to prepare slurries with different properties, and shield slag slurry 1 and shield slag slurry 2 are obtained for standby use;

[0123] 10 parts of the carbide slag, 10 parts of the slag and 19 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, and the mixture I is combined with 2 parts of the water reducing agent and mixed and stirred to obtain a mixture II;

[0124] 70 parts of the prepared shield slag slurry II are mixed with mixture II and stirred, and the mixture is stirred at a stirring speed of 650 r / min for at least 170 seconds to obtain the shield slag ecological grouting material based on stratum adaptability.

[0125] Comparative Example 5:

[0126] The present invention proposes a shield slag ecological grouting material based on stratum adaptability, and its raw materials include (parts by weight): 0 parts of shield slag mud one, 70 parts of shield slag mud two (mud specific gravity 1.65), 10 parts of calcium carbide slag, 10 parts of slag, 19 parts of fly ash and 2 parts of water reducing agent. Shield slag mud one and shield slag mud two constitute the different types of shield muds.

[0127] The production process of shield slag ecological grouting material based on stratum adaptability comprises the following steps:

[0128] After crushing different types of shield slag separately, they are screened;

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

[0130] According to the ground conditions, shield slag with different fineness modulus is selected as a group and hydrolyzed mud is added, and then the required number of portions is weighed according to the proportion and mixed for later use;

[0131] The shield slag is divided into slag type 1 and slag type 2, classified according to different fineness moduli, and the water content is adjusted to prepare slurries with different properties, and shield slag slurry 1 and shield slag slurry 2 are obtained for standby use;

[0132] 10 parts of the carbide slag, 10 parts of the slag and 19 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, and the mixture I is combined with 2 parts of the water reducing agent and mixed and stirred to obtain a mixture II;

[0133] 70 parts of the prepared shield slag slurry II are mixed with mixture II and stirred, and the mixture is stirred at a stirring speed of 700 r / min for at least 180 s to obtain the shield slag ecological grouting material based on stratum adaptability.

[0134] Verification example:

[0135] In order to verify the performance of the ecological grouting material based on shield slag obtained in the above examples and comparative examples, the following experiments were conducted:

[0136] Use an electronic scale with a range of more than 3kg to weigh 1L of slurry with an accuracy of 0.1g. According to the "T / CECS 563-2018 Technical Specification for the Application of Synchronous Grouting Materials in Shield Tunneling", the calculated weight to volume ratio is the apparent density of the grouting material.

[0137] Pour the slurry of synchronous grouting material so that it is slightly below the edge of the container by about 10 mm. Use a tamping rod to tamp 25 times, and gently shake or tap the container 5 to 6 times to make the slurry surface flat. Place the container on the base of the consistency tester, move the test cone down to the slurry surface and lock the slide bar, and adjust the reading to zero. Release the lock and let the test cone sink freely in the slurry for 10 seconds. Record the sinking distance, which is the consistency value of the synchronous grouting material.

[0138] Pour the prepared grouting material slurry into the measuring container so that the slurry surface is 10 mm lower than the container mouth. Tap the edge of the container to level the slurry surface and cover the container tightly. Place the container in an environment of 20±2℃ and let it stand. Then, place the container on a device with a pressure indicator and adjust the screw so that the probe touches the surface of the slurry. By rotating the screw, set the probe to a depth of 25 mm in the slurry and lock it. The setting time starts from the time of adding water and stirring, and the resistance of the probe to be pressed in is measured every 30 minutes. When the probe resistance reaches 0.3MPa, measure it every 15 minutes until the resistance value rises to 0.7MPa.

[0139] Place a 250mL measuring cylinder on the plane, inject 250mL of synchronous grouting material slurry into it, wait for 1 minute and immediately measure and record the scale value of the initial surface of the slurry, and seal the measuring cylinder. After three hours, measure the scale values ​​a1 and a2 corresponding to the water seepage surface and the slurry surface, and calculate the water seepage rate according to the following formula:

[0140] BR 3h =a 1 -a 2 ×100%

[0141] a0

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

[0143]

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

[0145] Pour the prepared slurry into a cubic mold with a side length of 70.7 mm, place it in a laboratory at 20°C for 24 hours, demould it, and move it to a curing room, keep it at 20°C and 99% relative humidity, and then perform a compressive strength test after curing to the standard age. Test the compressive strength according to GB / T 17671-1999 "Test Method for Strength of Cement Mortar (ISO Method)".

[0146] Place a cubic test mold with a side length of 70.7 mm in a water tank and fill it with water until it is at least 10 mm above the surface of the test mold. Use a funnel to slowly pour the grouting slurry to ensure that the test mold is full and let it stand for 5 to 10 minutes. Tap both sides of the test mold to remove attached moisture, and then immerse it in water again for curing. After 3 days of curing, demould it and cure it in water for up to 28 days, keeping the water temperature at 20℃±3℃. Finally, the compressive strength is measured using the same test method and equipment. The water-to-land strength ratio is calculated as follows:

[0147]

[0148] Where SR represents the water-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] It can be seen from the results in the above table that the slurries obtained in various embodiments of the present invention can effectively meet the general performance requirements for tunnel shield synchronous grouting, and have high compressive strength and high water-to-land strength ratio.

[0154] Application examples:

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

[0156] During the grouting process applied to the study area, the tunneling parameters of the shield machine were recorded every 5 meters. These parameters included soil pressure, thrust, torque, earthwork discharge, tunneling speed, and the pressure and volume of synchronous grouting. For the shield eco-grouting fluid, the initial grouting pressure was set between 0.2 and 0.4 MPa, and the grouting ratio was about 1.5. According to the actual situation of tunneling, the pressure and volume of grouting will be adjusted accordingly to ensure the best effect of the grouting process.

[0157] The test results show that the compressive strength of the ecological grouting material reaches 1.4MPa, the bonding performance is excellent, and the highest water-land strength ratio reaches 71%, which meets the requirements of engineering application. When applied to the subway shield tunnel, the final settlement of the two monitoring sections remained at about 20mm. Compared with the ground settlement of about 25mm when using existing commercial slurry, the effect of the shield ecological synchronous grouting material is more significant.

[0158] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A shield slag ecological grouting material based on stratum adaptability, characterized in that: The invention is made of the following raw materials in parts by weight: 50-70 parts of different types of shield mud, 10-15 parts of carbide slag, 10-15 parts of slag, 5-10 parts of fly ash and 1-3 parts of water reducing agent, wherein the amount of water used satisfies the mud specific gravity range of 1.55-1.

75.

2. The shield slag ecological grouting material based on stratum adaptability according to claim 1 is characterized in that: The different types of shield slag are waste slag generated by different tunnels and underground shield projects.

3. The shield slag ecological grouting material and production process based on stratum adaptability as claimed in claim 2 is characterized in that: The fly ash is Class II ash, the water reducer is an early strength type water reducer, the carbide slag is fine particle carbide slag, and the slag is water quenched slag.

4. A production process of shield slag ecological grouting material based on stratum adaptability, applied to the shield slag ecological grouting material based on stratum adaptability as claimed in claim 1, characterized in that: The steps include: S1: crush different types of shield waste separately and then screen them; S2: The sieved fine particles are evenly loaded into the ball mill for centralized grinding. After the grinding is completed, the ground products are transferred to a drying container for storage; S3: According to the ground conditions, shield slag with different fineness modulus is selected as a group and hydrolyzed mud is added, and then the required number of portions is weighed according to the proportion and mixed for later use; S4: Classify the shield slag components after adding hydrolyzed mud into slag type 1 and slag type 2 according to different fineness moduli, and adjust the moisture content to prepare slurries with different properties, so as to obtain shield slag slurry 1 and shield slag slurry 2 for standby use; S5: screening the carbide slag, the slag and the fly ash to make their maximum particle size less than 120 μm, mixing and stirring the carbide slag, the slag and the fly ash to form a uniform mixture I, combining the mixture I with the water reducing agent and mixing and stirring to obtain a mixture II; S6: Mixing and stirring the mixture II, shield slag slurry 1 and shield slag slurry 2 to obtain the shield slag ecological grouting material based on stratum adaptability.

5. The production process of shield slag ecological grouting material based on stratum adaptability as claimed in claim 4 is characterized in that: In step S1, during the screening process, the shield slag needs to be classified into shield slag I, shield slag II, shield slag III, shield slag IV, and shield slag V, wherein the fineness modulus of shield slag I is 4.6-3.8, the fineness modulus of shield slag II is 3.7-3.1, the fineness modulus of shield slag III is 3.0-2.3, the fineness modulus of shield slag IV is 2.2-1.6, and the fineness modulus of shield slag V is 1.5-0.7, and the particle size of the shield slag after screening needs to be less than 3 mm.

6. The production process of shield slag ecological grouting material based on stratum adaptability as claimed in claim 5 is 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 required 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.

7. The production process of shield slag ecological grouting material based on stratum adaptability as claimed in claim 6 is characterized in that: In step S2, during the grinding process, the temperature in 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 the target being D50<20 μm.

8. The shield slag ecological grouting material and production process based on stratum adaptability as claimed in claim 7 is characterized in that: In step S5, the mixing and stirring conditions 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 to 3 minutes.

9. The shield slag ecological grouting material and production process based on stratum adaptability as claimed in claim 8 is characterized in that: In step S5, the conditions for mixing the mixture I and the water reducing agent for mixing are: the mixing rate is set to 200-300 r / min, and the mixing time is set to 2 to 3 minutes.

10. The shield slag ecological grouting material and production process based on stratum adaptability according to claim 9, characterized in that: In step S6, the conditions for mixing and stirring the mixture II and the composite mud mixture are: the mixing and stirring rate is set to 550-700 r / min, and the mixing and stirring time is set to 150 to 180 seconds.

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