Method for building shield splitting grout-emitting anti-diffusion curtain for still water area
By determining the size of the anti-diffusion curtain based on the rules of mud splitting and escaping, and establishing an anti-diffusion curtain when the mud-water shield passes through the reservoir, the problem of water pollution caused by slurry escaping is solved, and effective pollution control and reservoir water quality are achieved. Protect.
Patent Information
- Application Number
- CN202411485037.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-23
- Publication Date
- 2025-01-21
AI Technical Summary
When mud and water shield penetrates important water sources such as reservoirs, the cracking of mud and slurry may lead to water pollution. The existing response measures are not effective and there is a lack of effective methods for establishing anti-diffusion curtains.
By studying the rules of mud splitting and slurry emitting, the length and width of the anti-diffusion curtain are determined. When the mud-water shield splits and slurry is emitted, an anti-diffusion curtain is established in the water area to seal the location of the mud leakage and pump out the leaked mud. Until the water quality meets the standard requirements.
Effectively control the source of pollution, isolation of mud, prevent the water pollution of the reservoir, and provide a safe reference for the construction of the reservoir under the mud shield.
Smart Images
Figure CN119333156A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of slurry shields, and in particular to a method for establishing a shield splitting slurry diffusion prevention curtain for use in still water areas. Background Art
[0002] In recent years, the pace of infrastructure construction in my country has accelerated significantly, and the development of underground spaces such as roads, railways, water conservancy and urban municipal pipe corridors is in a golden period of vigorous development. Against this background, the application scope of shield method in tunnel construction projects has been continuously expanded with its excellent safety performance and efficient operation ability. Among them, slurry shield technology has been widely used in tunnel engineering construction involving underwater environment with its unique excavation face support mechanism.
[0003] However, during the excavation of the slurry shield, mud may break through the mud film and split the stratum. The splitting surface of the large-diameter slurry shield tunnel is generally more upright, the splitting path is shorter, and the risk is higher. When a large-diameter slurry shield is working underwater, especially when it passes through important water sources such as reservoirs, once slurry occurs, it will cause water pollution, which will lead to serious economic losses. Therefore, how to deal with the risk of slurry in the water section is crucial. At present, the research on the countermeasures for slurry when a large-diameter slurry shield passes through important water sources such as reservoirs has not been in-depth. When slurry occurs, it can only be roughly blocked by an anti-diffusion curtain. The range of the anti-diffusion curtain is sometimes too large and sometimes too small. Correspondingly, there is a lack of proof of the effectiveness of the countermeasures. Therefore, there is an urgent need for a method for establishing an anti-diffusion curtain for shield splitting and slurry in still water areas to determine the range of the anti-diffusion curtain and provide a reference for the construction of similar projects. Summary of the invention
[0004] The present invention provides a method for establishing a shield splitting slurry bubbling anti-diffusion curtain for use in still water areas. The size of the anti-diffusion curtain can be determined according to the law of slurry splitting and bubbling, and the range of the shield splitting slurry bubbling anti-diffusion curtain can be determined. The pollution source can be effectively controlled from the source, the slurry can be isolated, and the water pollution of the reservoir can be prevented and controlled, thus providing a reference for the construction safety of the slurry shield tunneling under the reservoir.
[0005] The present invention is achieved through the following technical solutions: A method for establishing a shield splitting slurry diffusion prevention curtain for use in still water areas, comprising the following steps: S01. Determine the length and width of the anti-diffusion curtain according to the law of mud splitting and slurry bubbling, and determine the scope of the anti-diffusion curtain for shield splitting and slurry bubbling; S02. Implement a shield splitting and slurry bubbling anti-diffusion curtain according to the location of the slurry splitting and bubbling and the size of the slurry shield. When the shield splitting and bubbling occurs, establish an anti-diffusion curtain in the water area; S03. Use anti-diffusion curtain to seal the mud leakage location and pump out the leaked mud until the water quality meets the standard requirements.
[0006] Furthermore, in step S01, The mud squeezes the front excavation surface, which will cause the mud film-sand layer structure at the upper and lower ends of the excavation space to be tensilely damaged. Under the action of high-pressure mud squeezing, the splitting extends upward along the splitting initiation surface at the upper end of the excavation space, forming an oblique straight shear slip surface in the soil. The splitting extends along the weak surface of the shear slip surface to the surface of the soil. The calculation process of the width w of the diffusion-proof curtain is as follows: (1) Where: is the angle between the shear slip plane and the horizontal direction, is the internal friction angle of the soil; (2) Where: is the length range of mud splitting on the horizontal plane, is the distance from the tunnel crown to the soil surface; (3) Where: is the width safety factor; Length of diffusion curtain The size calculation process is as follows: (4) Where: is the length safety factor.
[0007] Furthermore, the width safety factor is taken The value is 1.5, taking the length safety factor The value of is 2.0.
[0008] Further, in step S02, the steps of implementing the shield splitting slurry diffusion prevention curtain are as follows: The ship drags the anti-diffusion curtain in the water above the slurry shield to ensure that the anti-diffusion curtain is always located directly above the excavation surface of the slurry shield; When the shield splits and slurry leaks, the waterproof membrane is connected to the counterweight block and transported vertically downward over the water area to form a diffusion-proof curtain.
[0009] Furthermore, in step S03, according to the "Surface Water Environmental Quality Standard" (GB3838-2002), the emergency rescue team members use a diffusion-proof curtain to block the polluted water area, and the members carry slurry pumps and drainage pipes to pump out the slurry concentrated area. When there is a platform operation, multiple mud collection pools are set up. When there is no platform operating on the water surface, the pipeline is led to a designated location outside the reservoir for pumping until the slurry in the mud concentrated area is completely pumped out, the leaked mud is pumped out, and water quality monitoring is organized at the slurry bubble and the reservoir outlet until the water quality meets the standard requirements.
[0010] Compared with the prior art, the present invention has the following beneficial effects: 1. Through the method for establishing a shield splitting slurry bubbling anti-diffusion curtain for use in still water areas described in the present invention, the size of the anti-diffusion curtain can be determined according to the law of mud splitting and bubbling, and the range of the shield splitting slurry bubbling anti-diffusion curtain can be determined; according to the location of the mud splitting and bubbling, the implementation plan of the shield splitting slurry bubbling anti-diffusion curtain can be determined; the anti-diffusion curtain is used to seal the mud leakage location, and the leaked mud is pumped out until the water quality meets the standard requirements. It can quickly respond to the risk of mud bubbling during the excavation of the slurry shield, effectively control the pollution source from the source, isolate the mud, prevent and control reservoir water pollution, and provide a reference for the construction safety of the slurry shield under the reservoir; 2. The length and width of the anti-diffusion curtain are determined based on the predicted length range of mud splitting on the horizontal plane. Combined with a reasonable safety factor, when splitting and slurry bubbling occurs, it can effectively block the source of pollution, isolate the mud, and prevent reservoir water pollution. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a schematic cross-sectional view of the shield splitting slurry diffusion prevention curtain area according to the present invention.
[0012] Figure 2 This is a schematic plan view of the shield splitting slurry diffusion prevention curtain area described in the present invention.
[0013] In the figure: 1- shield splitting slurry anti-diffusion curtain area, 2- waterproof membrane material, 3- counterweight block, 4- support. DETAILED DESCRIPTION
[0014] The 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 only used to explain the present invention, and cannot be interpreted as limiting the present invention.
[0015] It will be understood by those skilled in the art that, unless expressly stated, the singular forms "one", "said", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or coupling. The term "and / or" used herein includes any unit and all combinations of one or more associated listed items.
[0016] In order to solve the problem in the background technology, this embodiment discloses a method for establishing a shield splitting slurry diffusion prevention curtain for use in still water areas, comprising the following steps: S01. Determine the length and width of the anti-diffusion curtain according to the law of mud splitting and slurry bubbling, and determine the scope of the anti-diffusion curtain for shield splitting and slurry bubbling; In this step, the mud squeezes the front excavation surface, which causes the mud film-sand layer structure at the upper and lower ends of the excavation space to be tensilely damaged. Under the action of high-pressure mud squeezing, the splitting extends upward along the splitting initiation surface at the upper end of the excavation space, forming an oblique straight shear slip surface in the soil body, and the splitting extends along the weak surface of the shear slip surface to the surface of the soil body; The calculation process of the width w of the diffusion-proof curtain is as follows: (1) Where: is the angle between the shear slip plane and the horizontal direction, is the internal friction angle of the soil; It is worth noting that the internal friction angle of the stratum excavated by the slurry shield is determined by indoor triaxial compression test and direct shear test, or obtained by static penetration test on site; (2) Where: is the length range of mud splitting on the horizontal plane, is the distance from the tunnel crown to the soil surface; The distance from the tunnel vault to the soil surface is calculated and designed in advance according to the tunnel scale before shield tunnel construction; (3) Where: is the width safety factor; According to the calculation results, in order to retain a certain safety value, the width safety factor is taken as 1.5; Length of diffusion curtain The size calculation process is as follows: (4) Where: is the length safety factor; Considering that mud-water splitting has a backward annular splitting surface in addition to the longitudinal splitting surface along the excavation direction, the length safety factor is taken as 2.0; In this embodiment, the size of the anti-diffusion curtain is determined to be 50m in length, 25m in width, and 3m in height, which is determined according to the depth of the water area; S02. According to the location of the slurry splitting and the size of the slurry shield, a shield splitting and slurry diffusion prevention curtain is implemented. In this embodiment, the steps of implementing the shield splitting and slurry diffusion prevention curtain are as follows: The ship drags the water working platform loaded with the anti-diffusion curtain assembly forward in the water area above the slurry shield to ensure that the anti-diffusion curtain is always located directly above the excavation surface of the slurry shield. The size of the water working platform is 50m×25m and it is composed of a combined floating module. When the shield splits and slurries occur, the relevant staff on the water working platform will pass the waterproof membrane material 2 around the guide rollers, friction rollers, and buffer components on the edge of the water working platform and connect it to the counterweight block 3. Through the support 4 arranged on the inner side of the water working platform, the waterproof membrane material 2 is vertically transported to the bottom of the water area by the slideway provided on the support 4 until the counterweight block 3 falls on the surface of the soil at the bottom of the water area, forming an anti-diffusion curtain. The anti-diffusion curtain thus forms a shield splitting and slurry anti-diffusion curtain area 1 with a length of 50m and a width of 25m; S03. Use anti-diffusion curtain to seal the mud leakage location and pump out the leaked mud until the water quality meets the standard requirements; In this step, according to the "Surface Water Environmental Quality Standard" (GB3838-2002), the emergency rescue team members use anti-diffusion curtains to block the polluted waters, and the members carry slurry pumps and drainage pipes to pump out the slurry from the concentrated areas. When there is a platform for operation, multiple mud collection pools are set up. When there is no platform for surface operation, the pipeline is led to the designated location outside the reservoir for pumping until the slurry in the mud concentrated area is completely pumped out, the leaked mud is pumped out, and water quality monitoring is organized at the slurry bubble and reservoir outlet until the water quality meets the standard requirements.
[0017] To sum up, the method for establishing a shield splitting slurry diffusion prevention curtain for use in still water areas proposed in the present invention can quickly respond to the risk of mud slurry leakage during the excavation of the slurry shield, effectively control the source of pollution from the source, isolate the mud, prevent and control reservoir water pollution, and provide a reference for the construction safety of the slurry shield under the reservoir.
Claims
1. A method for establishing a shield splitting slurry diffusion prevention curtain for use in still water areas, characterized in that: The following steps are involved: S01. Determine the length and width of the anti-diffusion curtain according to the law of mud splitting and slurry bubbling, and determine the scope of the anti-diffusion curtain for shield splitting and slurry bubbling; S02. Implement a shield splitting and slurry bubbling anti-diffusion curtain according to the location of the slurry splitting and bubbling and the size of the slurry shield. When the shield splitting and bubbling occurs, establish an anti-diffusion curtain in the water area; S03. Use anti-diffusion curtain to seal the mud leakage location and pump out the leaked mud until the water quality meets the standard requirements.
2. The method for establishing a shield splitting slurry anti-diffusion curtain for use in still water areas according to claim 1 is characterized in that: In step S01, The mud squeezes the front excavation surface, which will cause the mud film-sand layer structure at the upper and lower ends of the excavation space to be tensilely damaged. Under the action of high-pressure mud squeezing, the splitting extends upward along the splitting initiation surface at the upper end of the excavation space, forming an oblique straight shear slip surface in the soil. The splitting extends along the weak surface of the shear slip surface to the surface of the soil. The calculation process of the width w of the diffusion-proof curtain is as follows: （1） Where: is the angle between the shear slip plane and the horizontal direction, is the internal friction angle of the soil; （2） Where: is the length range of mud splitting on the horizontal plane, is the distance from the tunnel crown to the soil surface; （3） Where: is the width safety factor; Length of diffusion curtain The size calculation process is as follows: （4） Where: is the length safety factor.
3. The method for establishing a shield splitting slurry anti-diffusion curtain for use in still water areas according to claim 2 is characterized in that: Take the width safety factor The value is 1.5, taking the length safety factor The value of is 2.
0.
4. The method for establishing a shield splitting slurry anti-diffusion curtain for use in still water areas according to claim 1, characterized in that: In step S02, the steps of implementing the shield splitting slurry diffusion prevention curtain are as follows: The ship drags the anti-diffusion curtain in the water above the slurry shield to ensure that the anti-diffusion curtain is always located directly above the excavation surface of the slurry shield; When the shield splits and slurry leaks, the waterproof membrane is connected to the counterweight block and transported vertically downward over the water area to form a diffusion-proof curtain.
5. The method for establishing a shield splitting slurry anti-diffusion curtain for use in still water areas according to any one of claims 1 to 4, characterized in that: In step S03, according to the "Surface Water Environmental Quality Standard" (GB3838-2002), the emergency rescue team members use anti-diffusion curtains to block the polluted waters, and the members carry slurry pumps and drainage pipes to pump out the slurry concentration area. When there is a platform operation, multiple mud collection pools are set up. When there is no platform operating on the water surface, the pipeline is led to the designated location outside the reservoir for pumping until the slurry in the mud concentration area is completely pumped out, the leaked mud is pumped out, and the water quality monitoring at the slurry bubble and reservoir outlet is organized until the water quality meets the standard requirements.