CN116305501A - Method and system for judging influence subarea of open cut tunnel near shield tunnel collaborative construction - Google Patents
Method and system for judging influence subarea of open cut tunnel near shield tunnel collaborative construction Download PDFInfo
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Abstract
The invention discloses a method and a system for judging the influence subareas of the cooperative construction of an open cut tunnel adjacent shield tunnel, wherein the method comprises the following steps: collecting a first earth surface maximum sedimentation value after the open tunnel is excavated independently and a second earth surface maximum sedimentation value after the open tunnel and the close shield tunnel are excavated synchronously, and judging an influence partition based on the first earth surface maximum sedimentation value and the second earth surface maximum sedimentation value to obtain a first partition type; acquiring soil displacement data of the periphery of the open cut tunnel, obtaining the maximum horizontal displacement of the soil based on the soil displacement data, judging the influence partition based on the maximum horizontal displacement of the soil, and obtaining a second partition type; acquiring main stress of surrounding rock of the open cut tunnel, obtaining maximum main stress based on the main stress, judging influence partitions based on the maximum main stress, and obtaining a third partition type; the final affected partition is obtained based on the first partition type, the second partition type, and the third partition type. The invention has moderate technical difficulty, strong operability and wide popularization and application prospect.
Description
Technical Field
The invention belongs to the technical field of cooperative construction safety control of a near tunnel, and particularly relates to a method and a system for judging influence subareas of the cooperative construction of a near shield tunnel of an open tunnel.
Background
With the development of social economy in China, the number of urban underground engineering construction is rapidly increased. The current urban underground engineering construction faces a series of problems of narrow construction sites, multiple adjacent structures, strict environmental standards and the like, and especially the near-connection construction of tunnel engineering in urban construction dense areas is unavoidable. The synchronous construction safety risk of the urban near tunnel is high, the deformation of surrounding soil and an enclosure structure should be strictly controlled in the construction, otherwise, the accidents such as surface subsidence, instability and damage of adjacent buildings are extremely easy to cause.
The two adjacent tunnels are mutually influenced in the synchronous construction, and the influence degree is controlled by factors such as the distance between the two, the engineering scale, the geological conditions, the construction working procedures and the like. At present, research on the influence of tunnel construction on deformation of adjacent existing buildings (structures) at home and abroad mainly aims at the research on the mutual influence of synchronous construction of adjacent tunnels, and particularly, the research on the quantitative research on the influence of supporting structures and stratum deformation of urban open cut highway tunnels and adjacent shield tunnels in cooperative construction, the disturbance of cooperative construction on subareas and the like is still blank. When the influence degree is serious, corresponding design and construction measures are needed to ensure the synchronous construction safety of the near tunnel. Therefore, it is necessary to form a method for determining the influence of parallel collaborative construction of a near tunnel.
Disclosure of Invention
The invention aims to solve the defects of the prior art, and provides a method and a system for judging the influence subareas of the adjacent shield tunnel cooperative construction of an open-cut tunnel, which are used for predicting the mutual influence degree of the open-cut tunnel and the adjacent shield tunnel construction and determining the influence range.
In order to achieve the above object, the present invention provides the following solutions: the method for judging the influence subarea of the cooperative construction of the adjacent shield tunnel of the open cut tunnel comprises the following steps:
s1, collecting a first earth surface maximum sedimentation value after an open-cut tunnel is excavated independently and a second earth surface maximum sedimentation value after the open-cut tunnel and a near shield tunnel are excavated synchronously, and judging an influence partition based on the first earth surface maximum sedimentation value and the second earth surface maximum sedimentation value to obtain a first partition type;
s2, acquiring soil displacement data of the periphery of the open cut tunnel, obtaining the maximum horizontal displacement of the soil based on the soil displacement data, judging the influence subarea based on the maximum horizontal displacement of the soil, and obtaining a second subarea type;
s3, collecting main stress of surrounding rock of the open-cut tunnel, obtaining maximum main stress based on the main stress, judging influence subareas based on the maximum main stress, and obtaining a third subarea type;
s4, acquiring a final influence partition based on the first partition type, the second partition type and the third partition type.
Preferably, the S1 includes:
calculating the maximum subsidence amplitude of the earth surface based on the maximum subsidence value of the first earth surface and the maximum subsidence value of the second earth surface;
and obtaining the first partition type based on the surface maximum settlement amplitude.
Preferably, the method for obtaining the first partition type based on the surface maximum settlement amplitude comprises the following steps:
the maximum subsidence amplification of the earth surface is greater than 20%, and the first partition type is a strong influence area;
the maximum subsidence increase of the earth surface is more than 5% and less than 20%, and the first partition type is a weak influence area;
the maximum subsidence increase of the earth surface is less than 5%, and the first partition type is an influence-free region.
Preferably, the method for obtaining the second partition type includes:
the maximum horizontal displacement of the soil body is more than 3 multiplied by 10 -4 m, the second partition type is a strong influence area;
the maximum horizontal displacement of the soil body is more than 2.5 multiplied by 10 -4 m is less than 3×10 -4 m, wherein the second partition type is a weak influence area;
the maximum horizontal displacement of the soil body is less than 2.5 multiplied by 10 -4 m, the second partition type is an influence-free partition.
Preferably, the method for obtaining the third partition type includes:
collecting cohesive force of the surrounding rock, wherein the maximum main stress is larger than the cohesive force, and the third partition type is a strong influence area;
the maximum principal stress is greater than 0.5 times the cohesive force and less than the cohesive force, and the third partition type is a weak influence area;
the maximum principal stress is less than 0.5 times the cohesive force, and the third partition type is an influence-free region.
Preferably, the S4 includes:
constructing a calculation model to obtain a plurality of calculation working conditions;
based on the calculated working conditions, the shield tunnel burial depth H, the distance L between the open-cut tunnel and the near shield tunnel, the open-cut tunnel burial depth H and the shield tunnel diameter D are obtained;
obtaining partition discrimination criteria based on the shield tunnel buried depth H, the open tunnel, the proximity shield tunnel spacing L, the open tunnel buried depth H and the shield tunnel diameter D based on the first partition type, the second partition type and the third partition type;
the final affected partition is obtained based on the discriminant criteria.
The invention also provides a system for judging the cooperative construction influence subareas of the adjacent shield tunnel of the open cut tunnel, which comprises the following steps: the system comprises a first partition module, a second partition module, a third partition module and a fourth partition module;
the first partition module is used for collecting a first earth surface maximum sedimentation value after the open tunnel is excavated independently and a second earth surface maximum sedimentation value after the open tunnel and the close shield tunnel are excavated synchronously, and judging an influence partition based on the first earth surface maximum sedimentation value and the second earth surface maximum sedimentation value to obtain a first partition type;
the second partition module is used for collecting soil displacement data of the periphery of the open cut tunnel, obtaining the maximum horizontal displacement of the soil based on the soil displacement data, judging the influence partition based on the maximum horizontal displacement of the soil, and obtaining a second partition type;
the third partition module is used for collecting main stress of surrounding rock of the open cut tunnel, obtaining maximum main stress based on the main stress, judging influence partitions based on the maximum main stress, and obtaining a third partition type;
the fourth partition module is configured to obtain a final affected partition based on the first partition type, the second partition type, and the third partition type.
Preferably, the method for obtaining the final affected partition by the fourth partition module includes:
constructing a calculation model to obtain a plurality of calculation working conditions;
based on the calculated working conditions, the shield tunnel burial depth H, the distance L between the open-cut tunnel and the near shield tunnel, the open-cut tunnel burial depth H and the shield tunnel diameter D are obtained;
obtaining partition discrimination criteria based on the shield tunnel buried depth H, the open tunnel, the proximity shield tunnel spacing L, the open tunnel buried depth H and the shield tunnel diameter D based on the first partition type, the second partition type and the third partition type;
the final affected partition is obtained based on the discriminant criteria.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a method and a system for judging the influence partition of the cooperative construction of an open-cut tunnel adjacent shield tunnel, which can accurately predict the influence degree and the influence range of the shield tunnel and the open-cut tunnel on stratum under different burial depths and distances when the open-cut tunnel and the adjacent shield tunnel are constructed cooperatively. The real and reasonable evaluation of stratum disturbance by the cooperative construction of the open-cut tunnel and the near shield tunnel is realized. Meanwhile, the method has moderate technical difficulty, strong operability, mature acquisition technology of each evaluation index and wide popularization and application prospect.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for judging the influence subareas of the cooperative construction of an open cut tunnel adjacent shield tunnel in an embodiment of the invention;
fig. 2 is a schematic diagram of a relative positional relationship between the collaborative construction of an open cut tunnel and a near shield tunnel according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
As shown in fig. 1, the embodiment provides a method for determining the influence partition of the cooperative construction of an open cut tunnel adjacent shield tunnel, which includes the following steps:
s1, collecting a first earth surface maximum sedimentation value after an open-cut tunnel is excavated independently and a second earth surface maximum sedimentation value after the open-cut tunnel and a near shield tunnel are excavated synchronously, and judging an influence partition based on the first earth surface maximum sedimentation value and the second earth surface maximum sedimentation value to obtain a first partition type;
the influence of tunnel construction on the surrounding environment is transmitted through surrounding rocks, so that the deformation of the surrounding rocks reflects the disturbance degree of the tunnel construction to a certain extent. Because the proximity construction (building) is very sensitive to uneven settlement and the surface settlement is convenient to measure, a large amount of surface settlement data can be monitored in engineering practice. In the embodiment, the first partition type distinguishing method is provided by adopting the amplification of the first earth surface maximum sedimentation value (S1) of the open-cut tunnel and the close-shield tunnel which are excavated in the same period as the second earth surface maximum sedimentation value (S2) of the open-cut tunnel after being excavated independently, namely the earth surface maximum sedimentation amplification (delta F) as distinguishing index 1;
specific:
the maximum subsidence amplification of the earth surface is more than 20%, and the first partition type is a strong influence area;
the maximum subsidence amplification of the earth surface is more than 5% and less than 20%, and the first partition type is a weak influence area;
the maximum subsidence amplification of the earth surface is less than 5%, and the first partition type is an influence-free region.
S2, acquiring soil displacement data of the periphery of the open cut tunnel, obtaining the maximum horizontal displacement of the soil based on the soil displacement data, judging the influence subarea based on the maximum horizontal displacement of the soil, and obtaining a second subarea type;
the construction of the open cut highway tunnel can lead to the change of the peripheral soil displacement field, and indirectly cause the additional unfavorable deformation of the shield tunnel structure of the adjacent subway. The horizontal displacement of the soil body reflects the influence degree of the proximity construction on the adjacent tunnel structure, and the loosening range and the change rule of soil layers on two sides of the structure in the excavation process are known. Therefore, the embodiment adopts the maximum horizontal displacement (delta Y) of the soil body as the discrimination index 2, and provides a second partition type discrimination method;
specific:
the maximum horizontal displacement of the soil body is more than 3 multiplied by 10 -4 m, the second partition type is a strong influence area;
the maximum horizontal displacement of the soil body is more than 2.5 multiplied by 10 -4 m is less than 3×10 -4 m, the second partition type is a weak influence area;
the maximum horizontal displacement of the soil body is less than 2.5 multiplied by 10 -4 m, the second partition type is an influence-free partition.
S3, collecting main stress of surrounding rock of the open-cut tunnel, obtaining maximum main stress based on the main stress, judging influence zones based on the maximum main stress, and obtaining a third zone type;
the cohesive force and the tensile strength of the weak surrounding rock are small, and when the soil body has tensile stress, the stress on the surrounding rock soil body is extremely unfavorable, especially when 1 main stress is tensile stress and the other 2 main stresses are compressive stress, the surrounding rock is extremely easy to generate instability. Based on the molar-coulomb yield criterion, the maximum tensile strength is not more than c/tan phi, c and phi are the surrounding rock cohesive force and internal friction angle respectively. In the embodiment, the maximum principal stress is adopted as the discrimination index 3, and a third partition type discrimination method is provided;
in particular, the method comprises the steps of,
collecting cohesive force of surrounding rock, wherein the maximum main stress is larger than the cohesive force, and the third partition type is a strong influence area;
the maximum principal stress is greater than 0.5 times cohesive force and less than cohesive force, and the third partition type is a weak influence area;
the maximum principal stress is less than 0.5 times cohesive force, and the third partition type is an influence-free region.
In combination with the above, the final impact partition discrimination index and the partition level rule are shown in table 1;
TABLE 1
S4, acquiring a final influence partition based on the first partition type, the second partition type and the third partition type.
Specifically, the method comprises the following steps:
s41, constructing a calculation model to obtain a plurality of calculation working conditions;
as shown in FIG. 2, the present embodiment employs a numerical calculation program FLAC 3D And 6.0, carrying out numerical analysis, and accurately simulating the collaborative construction process of the open cut highway tunnel and the shield tunnel by adopting a Ph (plastics-harding) model.
Constructing a calculation model through a fish language; selecting a Ph constitutive model; further inputting structural parameters of stratum, open cut highway tunnel and shield tunnel; setting boundary conditions and completing initial ground stress balance; then monitoring and recording the horizontal displacement of the soil body, the earth surface subsidence and the maximum main stress through a history command; generating an enclosure structure, and applying a synchronous excavation command; and extracting monitoring points after the shield segment is generated, and calculating one working condition. Further, 81 calculation conditions are obtained in total by changing the buried depth h of the shield tunnel and the distance L between the open cut highway tunnel and the shield tunnel.
S42, obtaining the shield tunnel burial depth H, the distance L between the open-cut tunnel and the near shield tunnel, the open-cut tunnel burial depth H and the shield tunnel diameter D based on the calculation working condition;
s43, obtaining partition discrimination criteria based on the shield tunnel buried depth H, the open cut tunnel, the adjacent shield tunnel spacing L, the open cut tunnel buried depth H and the shield tunnel diameter D based on the first partition type, the second partition type and the third partition type;
discrimination criterion based on maximum surface subsidence:
when the value of H/H is in the interval of 0-1.5, the value of L/D is in the interval of 0-2 and is a strong influence area, the value of L/D is in the interval of 2-4 and is a weak influence area, and the value of L/D is in the interval of 4 to infinity and is a no influence area.
When the value of H/H is within the range of 1.5-2, the value of L/D is within the range of 0-4 and is a weak influence area, and the value of L/D is within the range of 4 to infinity and is a no influence area.
When the value of H/H is within the range of 2 to infinity, the method is an influence-free area.
Judging criterion II based on maximum horizontal displacement of soil mass:
when the value of H/H is in the interval of 0-1.5, the value of L/D is in the interval of 0-1 and is a strong influence area, the value of L/D is in the interval of 1-3 and is a weak influence area, and the value of L/D is in the interval of 3 to infinity and is a no influence area.
When the value of H/H is within the range of 1.5-2, the value of L/D is within the range of 0-3 and is a weak influence area, and the value of L/D is within the range of 3 to infinity and is a no influence area.
When the value of H/H is within the range of 2 to infinity, the method is an influence-free area.
And a third criterion based on the maximum main stress of the soil body:
when the value of H/H is in the interval of 0-1.5, the value of L/D is in the interval of 0-2 and is a strong influence area, the value of L/D is in the interval of 2-3 and is a weak influence area, and the value of L/D is in the interval of 3 to infinity and is a no influence area.
When the value of H/H is within the range of 1.5-2, the value of L/D is within the range of 0-2 and is a weak influence area, and the value of L/D is within the range of 2 to infinity and is a no influence area.
When the value of H/H is within the range of 2 to infinity, the method is an influence-free area.
Zonal discrimination criteria based on the shield tunnel burial depth H, the open cut tunnel, the proximity shield tunnel spacing L, the open cut tunnel burial depth H and the shield tunnel diameter D are shown in Table 2;
TABLE 2
S44, obtaining a final influence partition based on the discriminant criterion.
After the influence partition is determined by adopting the 3 discriminant criteria, the highest-level influence is selected as the final influence partition.
Example two
The invention also provides a system for judging the cooperative construction influence subareas of the adjacent shield tunnel of the open cut tunnel, which comprises the following steps: the system comprises a first partition module, a second partition module, a third partition module and a fourth partition module;
the first partition module is used for collecting a first earth surface maximum sedimentation value after the open tunnel is excavated independently and a second earth surface maximum sedimentation value after the open tunnel and the close shield tunnel are excavated synchronously, and judging the influence partition based on the first earth surface maximum sedimentation value and the second earth surface maximum sedimentation value to obtain a first partition type;
the influence of tunnel construction on the surrounding environment is transmitted through surrounding rocks, so that the deformation of the surrounding rocks reflects the disturbance degree of the tunnel construction to a certain extent. Because the proximity construction (building) is very sensitive to uneven settlement and the surface settlement is convenient to measure, a large amount of surface settlement data can be monitored in engineering practice. In the embodiment, the first partition type distinguishing method is provided by adopting the amplification of the first earth surface maximum sedimentation value (S1) of the open-cut tunnel and the close-shield tunnel which are excavated in the same period as the second earth surface maximum sedimentation value (S2) of the open-cut tunnel after being excavated independently, namely the earth surface maximum sedimentation amplification (delta F) as distinguishing index 1;
specifically, the method for obtaining the first partition type by the first partition module includes:
the maximum subsidence amplification of the earth surface is more than 20%, and the first partition type is a strong influence area;
the maximum subsidence amplification of the earth surface is more than 5% and less than 20%, and the first partition type is a weak influence area;
the maximum subsidence amplification of the earth surface is less than 5%, and the first partition type is an influence-free region.
The second partition module is used for collecting soil displacement data of the periphery of the open cut tunnel, obtaining the maximum horizontal displacement of the soil based on the soil displacement data, judging the influence partition based on the maximum horizontal displacement of the soil, and obtaining a second partition type;
the construction of the open cut highway tunnel can lead to the change of the peripheral soil displacement field, and indirectly cause the additional unfavorable deformation of the shield tunnel structure of the adjacent subway. The horizontal displacement of the soil body reflects the influence degree of the proximity construction on the adjacent tunnel structure, and the loosening range and the change rule of soil layers on two sides of the structure in the excavation process are known. Therefore, the embodiment adopts the maximum horizontal displacement (delta Y) of the soil body as the discrimination index 2, and provides a second partition type discrimination method;
specifically, the method for obtaining the second partition type by the second partition module includes:
the maximum horizontal displacement of the soil body is more than 3 multiplied by 10 -4 m, the second partition type is a strong influence area;
the maximum horizontal displacement of the soil body is more than 2.5 multiplied by 10 -4 m is less than 3×10 -4 m, the second partition type is a weak influence area;
the maximum horizontal displacement of the soil body is less than 2.5 multiplied by 10 -4 m, the second partition type is an influence-free partition.
The third partition module is used for collecting main stress of surrounding rock of the open cut tunnel, obtaining maximum main stress based on the main stress, judging influence partitions based on the maximum main stress, and obtaining a third partition type;
the cohesive force and the tensile strength of the weak surrounding rock are small, and when the soil body has tensile stress, the stress on the surrounding rock soil body is extremely unfavorable, especially when 1 main stress is tensile stress and the other 2 main stresses are compressive stress, the surrounding rock is extremely easy to generate instability. Based on the molar-coulomb yield criterion, the maximum tensile strength is not more than c/tan phi, c and phi are the surrounding rock cohesive force and internal friction angle respectively. In the embodiment, the maximum principal stress is adopted as the discrimination index 3, and a third partition type discrimination method is provided;
specifically, the method for obtaining the third partition type by the third partition module includes:
collecting cohesive force of surrounding rock, wherein the maximum main stress is larger than the cohesive force, and the third partition type is a strong influence area;
the maximum principal stress is greater than 0.5 times cohesive force and less than cohesive force, and the third partition type is a weak influence area;
the maximum principal stress is less than 0.5 times cohesive force, and the third partition type is an influence-free region.
The fourth partition module is used for acquiring a final influence partition based on the first partition type, the second partition type and the third partition type.
The method for obtaining the final influence partition by the fourth partition module comprises the following steps:
(1) Constructing a calculation model to obtain a plurality of calculation working conditions;
the present embodiment employs a numerical calculation program FLAC 3D And 6.0, carrying out numerical analysis, and accurately simulating the collaborative construction process of the open cut highway tunnel and the shield tunnel by adopting a Ph (plastics-harding) model.
Constructing a calculation model through a fish language; selecting a Ph constitutive model; further inputting structural parameters of stratum, open cut highway tunnel and shield tunnel; setting boundary conditions and completing initial ground stress balance; then monitoring and recording the horizontal displacement of the soil body, the earth surface subsidence and the maximum main stress through a history command; generating an enclosure structure, and applying a synchronous excavation command; and extracting monitoring points after the shield segment is generated, and calculating one working condition. Further, 81 calculation conditions are obtained in total by changing the buried depth h of the shield tunnel and the distance L between the open cut highway tunnel and the shield tunnel.
(2) Based on the calculated working conditions, the shield tunnel buried depth H, the distance L between the open-cut tunnel and the near shield tunnel, the open-cut tunnel buried depth H and the shield tunnel diameter D are obtained;
(3) Obtaining partition discrimination criteria based on the shield tunnel buried depth H, the open cut tunnel, the adjacent shield tunnel spacing L, the open cut tunnel buried depth H and the shield tunnel diameter D based on the first partition type, the second partition type and the third partition type;
discrimination criterion based on maximum surface subsidence:
when the value of H/H is in the interval of 0-1.5, the value of L/D is in the interval of 0-2 and is a strong influence area, the value of L/D is in the interval of 2-4 and is a weak influence area, and the value of L/D is in the interval of 4 to infinity and is a no influence area.
When the value of H/H is within the range of 1.5-2, the value of L/D is within the range of 0-4 and is a weak influence area, and the value of L/D is within the range of 4 to infinity and is a no influence area.
When the value of H/H is within the range of 2 to infinity, the method is an influence-free area.
Judging criterion II based on maximum horizontal displacement of soil mass:
when the value of H/H is in the interval of 0-1.5, the value of L/D is in the interval of 0-1 and is a strong influence area, the value of L/D is in the interval of 1-3 and is a weak influence area, and the value of L/D is in the interval of 3 to infinity and is a no influence area.
When the value of H/H is within the range of 1.5-2, the value of L/D is within the range of 0-3 and is a weak influence area, and the value of L/D is within the range of 3 to infinity and is a no influence area.
When the value of H/H is within the range of 2 to infinity, the method is an influence-free area.
And a third criterion based on the maximum main stress of the soil body:
when the value of H/H is in the interval of 0-1.5, the value of L/D is in the interval of 0-2 and is a strong influence area, the value of L/D is in the interval of 2-3 and is a weak influence area, and the value of L/D is in the interval of 3 to infinity and is a no influence area.
When the value of H/H is within the range of 1.5-2, the value of L/D is within the range of 0-2 and is a weak influence area, and the value of L/D is within the range of 2 to infinity and is a no influence area.
When the value of H/H is within the range of 2 to infinity, the method is an influence-free area.
(4) The final impact partition is obtained based on the discriminant criteria.
After the influence partition is determined by adopting the 3 discriminant criteria, the highest-level influence is selected as the final influence partition.
The above embodiments are merely illustrative of the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but various modifications and improvements made by those skilled in the art to which the present invention pertains are made without departing from the spirit of the present invention, and all modifications and improvements fall within the scope of the present invention as defined in the appended claims.
Claims (8)
1. The method for judging the influence subarea of the open cut tunnel adjacent shield tunnel collaborative construction is characterized by comprising the following steps:
s1, collecting a first earth surface maximum sedimentation value after an open-cut tunnel is excavated independently and a second earth surface maximum sedimentation value after the open-cut tunnel and a near shield tunnel are excavated synchronously, and judging an influence partition based on the first earth surface maximum sedimentation value and the second earth surface maximum sedimentation value to obtain a first partition type;
s2, acquiring soil displacement data of the periphery of the open cut tunnel, obtaining the maximum horizontal displacement of the soil based on the soil displacement data, judging the influence subarea based on the maximum horizontal displacement of the soil, and obtaining a second subarea type;
s3, collecting main stress of surrounding rock of the open-cut tunnel, obtaining maximum main stress based on the main stress, judging influence subareas based on the maximum main stress, and obtaining a third subarea type;
s4, acquiring a final influence partition based on the first partition type, the second partition type and the third partition type.
2. The method for determining the influence partition of the cooperative construction of the open cut tunnel adjacent shield tunnel according to claim 1, wherein S1 comprises:
calculating the maximum subsidence amplitude of the earth surface based on the maximum subsidence value of the first earth surface and the maximum subsidence value of the second earth surface;
and obtaining the first partition type based on the surface maximum settlement amplitude.
3. The method for determining the partition of the cooperative construction influence of the open cut tunnel adjacent shield tunnel according to claim 2, wherein the method for obtaining the first partition type based on the maximum subsidence amplitude of the earth surface comprises the following steps:
the maximum subsidence amplification of the earth surface is greater than 20%, and the first partition type is a strong influence area;
the maximum subsidence increase of the earth surface is more than 5% and less than 20%, and the first partition type is a weak influence area;
the maximum subsidence increase of the earth surface is less than 5%, and the first partition type is an influence-free region.
4. The method for determining the influence partition of the cooperative construction of the open cut tunnel adjacent shield tunnel according to claim 1, wherein the method for obtaining the second partition type comprises the following steps:
the maximum horizontal displacement of the soil body is more than 3 multiplied by 10 -4 m, the second partition type is a strong influence area;
the maximum horizontal displacement of the soil body is more than 2.5 multiplied by 10 -4 m is less than 3×10 -4 m, wherein the second partition type is a weak influence area;
the maximum horizontal displacement of the soil body is less than 2.5 multiplied by 10 -4 m, the second partition type is an influence-free partition.
5. The method for determining the partition of the cooperative construction influence of the open cut tunnel adjacent shield tunnel according to claim 1, wherein the method for obtaining the third partition type comprises the following steps:
collecting cohesive force of the surrounding rock, wherein the maximum main stress is larger than the cohesive force, and the third partition type is a strong influence area;
the maximum principal stress is greater than 0.5 times the cohesive force and less than the cohesive force, and the third partition type is a weak influence area;
the maximum principal stress is less than 0.5 times the cohesive force, and the third partition type is an influence-free region.
6. The method for determining the influence partition of the cooperative construction of the open cut tunnel adjacent shield tunnel according to claim 1, wherein the step S4 comprises:
constructing a calculation model to obtain a plurality of calculation working conditions;
based on the calculated working conditions, the shield tunnel burial depth H, the distance L between the open-cut tunnel and the near shield tunnel, the open-cut tunnel burial depth H and the shield tunnel diameter D are obtained;
obtaining partition discrimination criteria based on the shield tunnel buried depth H, the open tunnel, the proximity shield tunnel spacing L, the open tunnel buried depth H and the shield tunnel diameter D based on the first partition type, the second partition type and the third partition type;
the final affected partition is obtained based on the discriminant criteria.
7. The utility model provides an open cut tunnel near shield tunnel collaborative construction influences subregion decision-making system which characterized in that includes: the system comprises a first partition module, a second partition module, a third partition module and a fourth partition module;
the first partition module is used for collecting a first earth surface maximum sedimentation value after the open tunnel is excavated independently and a second earth surface maximum sedimentation value after the open tunnel and the close shield tunnel are excavated synchronously, and judging an influence partition based on the first earth surface maximum sedimentation value and the second earth surface maximum sedimentation value to obtain a first partition type;
the second partition module is used for collecting soil displacement data of the periphery of the open cut tunnel, obtaining the maximum horizontal displacement of the soil based on the soil displacement data, judging the influence partition based on the maximum horizontal displacement of the soil, and obtaining a second partition type;
the third partition module is used for collecting main stress of surrounding rock of the open cut tunnel, obtaining maximum main stress based on the main stress, judging influence partitions based on the maximum main stress, and obtaining a third partition type;
the fourth partition module is configured to obtain a final affected partition based on the first partition type, the second partition type, and the third partition type.
8. The open cut tunnel shield tunnel collaborative construction influence partition determination system according to claim 7, wherein the method for obtaining the final influence partition by the fourth partition module comprises:
constructing a calculation model to obtain a plurality of calculation working conditions;
based on the calculated working conditions, the shield tunnel burial depth H, the distance L between the open-cut tunnel and the near shield tunnel, the open-cut tunnel burial depth H and the shield tunnel diameter D are obtained;
obtaining partition discrimination criteria based on the shield tunnel buried depth H, the open tunnel, the proximity shield tunnel spacing L, the open tunnel buried depth H and the shield tunnel diameter D based on the first partition type, the second partition type and the third partition type;
the final affected partition is obtained based on the discriminant criteria.
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| CN106228001A (en) * | 2016-07-15 | 2016-12-14 | 浙江大学城市学院 | The subregion appraisal procedure that safety of surrounding environment is impacted by shield tunnel construction |
| US20210301660A1 (en) * | 2020-03-25 | 2021-09-30 | Bridge & Tunnel Engineering Company of the Third Engineering Group Co. Ltd. of China Railway | Construction method for making water-rich sand layer shield over cross existing line and underneath cross sewage push pipe at close range |
| CN114592519A (en) * | 2022-03-16 | 2022-06-07 | 中冶赛迪工程技术股份有限公司 | Method for partitioning engineering influence of foundation pit excavation on existing tunnel lying below |
| CN115952578A (en) * | 2022-12-09 | 2023-04-11 | 中国电建集团成都勘测设计研究院有限公司 | Method for analyzing deformation influence of existing railway passing through sand-gravel stratum tunnel |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106228001A (en) * | 2016-07-15 | 2016-12-14 | 浙江大学城市学院 | The subregion appraisal procedure that safety of surrounding environment is impacted by shield tunnel construction |
| US20210301660A1 (en) * | 2020-03-25 | 2021-09-30 | Bridge & Tunnel Engineering Company of the Third Engineering Group Co. Ltd. of China Railway | Construction method for making water-rich sand layer shield over cross existing line and underneath cross sewage push pipe at close range |
| CN114592519A (en) * | 2022-03-16 | 2022-06-07 | 中冶赛迪工程技术股份有限公司 | Method for partitioning engineering influence of foundation pit excavation on existing tunnel lying below |
| CN115952578A (en) * | 2022-12-09 | 2023-04-11 | 中国电建集团成都勘测设计研究院有限公司 | Method for analyzing deformation influence of existing railway passing through sand-gravel stratum tunnel |
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