CN114922686A - Calculation method for determining influence of over excavation of top plate of deep-buried rectangular tunnel on collapse - Google Patents

Calculation method for determining influence of over excavation of top plate of deep-buried rectangular tunnel on collapse Download PDF

Info

Publication number
CN114922686A
CN114922686A CN202210548785.0A CN202210548785A CN114922686A CN 114922686 A CN114922686 A CN 114922686A CN 202210548785 A CN202210548785 A CN 202210548785A CN 114922686 A CN114922686 A CN 114922686A
Authority
CN
China
Prior art keywords
collapse
rectangular tunnel
excavation
over
overbreak
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210548785.0A
Other languages
Chinese (zh)
Inventor
安永林
郭晋东
周进
谭格宇
刘文娟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan University of Science and Technology
Original Assignee
Hunan University of Science and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hunan University of Science and Technology filed Critical Hunan University of Science and Technology
Priority to CN202210548785.0A priority Critical patent/CN114922686A/en
Publication of CN114922686A publication Critical patent/CN114922686A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
    • E21F17/18—Special adaptations of signalling or alarm devices
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/02—Reliability analysis or reliability optimisation; Failure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mining & Mineral Resources (AREA)
  • Geometry (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Evolutionary Computation (AREA)
  • Pure & Applied Mathematics (AREA)
  • Civil Engineering (AREA)
  • Architecture (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Analysis (AREA)
  • Computational Mathematics (AREA)
  • Structural Engineering (AREA)
  • Lining And Supports For Tunnels (AREA)

Abstract

The invention discloses a method for calculating the influence of over excavation of a top plate of a deep-buried rectangular tunnel on collapse. The method mainly comprises the following steps: determining an overexcavation shape and an overexcavation area according to the overexcavation condition of the top plate of the deep-buried rectangular tunnel; calculating collapse body weight doing work of the deep-buried rectangular tunnel; calculating internal energy dissipation of the collapsed body of the deeply buried rectangular tunnel; solving the collapse range and the collapse amount according to the minimum energy consumption principle and the boundary conditions; and (4) changing different overbreak heights, overbreak widths and overbreak areas, and calculating the influence of the overbreak heights, the overbreak widths and the overbreak areas on the collapse range and the collapse size. The method can be applied to analysis of the influence of the over excavation on the collapse in the underground engineering with the form of the deep-buried rectangular section, provides a calculation method for determining the influence of the over excavation on the collapse of the top plate of the deep-buried rectangular tunnel, can consider the influence of the over excavation width, the over excavation height and the over excavation area, provides theoretical method guidance for determining the over excavation influence and reinforcing and preventing the collapse, and is favorable for safe construction.

Description

Calculation method for determining influence of over excavation of top plate of deep-buried rectangular tunnel on collapse
Technical Field
The invention belongs to the technical field of tunnel construction, and particularly relates to a calculation method for determining the influence of over excavation of a top plate of a deep-buried rectangular tunnel on collapse.
Background
Along with the development of urban underground space, a plurality of tunnels and underground engineering can be built, and the tunnel gradually develops towards the trend of deeper and deeper burial depth; in underground mining of energy such as mining and the like, after shallow resources are developed, development is gradually carried out towards deep resources, the mining depth is continuously expanded towards underground deep parts, and a plurality of deeply buried underground projects are necessarily involved. Due to the existence of the rock mass joint crack, even if controlled blasting is adopted, overbreak and undermining are inevitable; if smooth blasting is not adopted or the loading amount is increased for the purpose of achieving the scheduled speed, the overbreak phenomenon is more serious. If some of the overbreaks are too large, collapse will be induced. The existing specification, whether the part of water conservancy and hydropower, or the technical specification of highway/railway tunnel construction, only provides the regulation on the allowable excessive excavation amount, and does not relate to the relevant regulation on the influence of the excessive excavation on the collapse of the surrounding rocks. The prior patents and documents are basically about the influence of the overexcavation on the surrounding rock and the timbering, the control device, and the like. There are few reports on how overbreak can be assessed for the effect of landslide.
Disclosure of Invention
The invention aims to provide a calculation method for determining the influence of the overbreak of a top plate of a deep-buried rectangular tunnel on collapse, aiming at the technical problems in the prior art.
The object of the present invention is achieved by the following technical means.
The method for determining the influence of the overexcavation of the top plate of the deep-buried rectangular tunnel on the collapse comprises the following steps.
(1) Determining an overexcavation shape and an overexcavation area according to the overexcavation condition of the top plate of the deep-buried rectangular tunnel; the overbreak shape is simplified to a triangle, and the overbreak area is determined by the following formula.
Figure 663361DEST_PATH_IMAGE001
。
In the formula, Sc is the area of the overexcavation region; h is the overbreak height and t is the overbreak width.
(2) And calculating the gravity work of the collapsed body of the deeply buried rectangular tunnel, which is determined by the following formula.
Figure 846080DEST_PATH_IMAGE002
。
In the formula, P γ Acting for the gravity of the deeply buried rectangular tunnel collapse body; l is half of the width of the collapse area; gamma is the surrounding rock gravity; f (x) is a collapsed shape function; v is the maneuvering allowable speed field; and x is the coordinate value of the x axis in the rectangular coordinate system.
(3) And calculating the internal energy dissipation of the deep-buried rectangular tunnel in the collapsed body, wherein the internal energy dissipation is determined by the following formula.
Figure 297921DEST_PATH_IMAGE003
。
In the formula, P D Internal energy dissipation of a collapsed square body of the deeply-buried rectangular tunnel is achieved;
Figure 224289DEST_PATH_IMAGE004
compressive strength of the complete surrounding rock; A. b is a surrounding rock parameter;
Figure 38661DEST_PATH_IMAGE005
the tangent slope of f (x), i.e., the first derivative;
Figure 782495DEST_PATH_IMAGE006
the tensile strength of the surrounding rock.
(4) According to the minimum energy consumption principle and the boundary conditions, the collapse range and the collapse quantity of the deep-buried rectangular tunnel are solved, and the method comprises the following steps.
And (I) constructing the following function by the gravity work and internal energy dissipation of the deeply buried rectangular tunnel collapse body.
Figure 580687DEST_PATH_IMAGE007
。
In the formula:
Figure 186112DEST_PATH_IMAGE008
the difference between internal energy dissipation of a collapsed rectangular tunnel body and collapse body weight work is calculated;
Figure 854991DEST_PATH_IMAGE009
it is a general function.
And (II) according to the variation principle of the general function, obtaining a corresponding Euler equation as follows.
Figure 379513DEST_PATH_IMAGE010
。
Combining with the boundary conditions, the solution can be obtained:
Figure 291099DEST_PATH_IMAGE011
。
in the formula, H is the height of a collapse area of a top plate of the deeply-buried rectangular tunnel;
Figure 293690DEST_PATH_IMAGE012
。
(III) according to the geometric conditions.
Figure 223600DEST_PATH_IMAGE013
。
So that:
Figure 184603DEST_PATH_IMAGE014
。
(IV) according to the law of conservation of energy, namely that the gravity work of the deeply buried rectangular tunnel collapse body is equal to the internal energy dissipation, so that the method can be obtained.
Figure 347600DEST_PATH_IMAGE015
。
And (V) combining the formulas of the steps (III) and (IV) to form an equation system, so that the collapse height H and the collapse width 2L can be solved, and the collapse size, namely the collapse area, can be obtained by the following formula.
Figure 294827DEST_PATH_IMAGE016
。
(VI) according to the above, combining the actual over-excavation condition to obtain the collapse range caused by the over-excavation of the top plate of the deep-buried rectangular tunnel, including the collapse area, the collapse height, the collapse width and the like; and (3) changing relevant parameters such as the over-excavation height, the over-excavation width and the like to obtain the influence of the over-excavation height, the over-excavation width and the over-excavation area on the collapse of the deeply-buried rectangular tunnel, thereby providing theoretical method guidance for determining the over-excavation influence and the reinforcement and prevention of the collapse.
Compared with the prior art and the research method, the invention has the following advantages:
the prior literature technical research mainly aims at the influence on surrounding rocks and supports after overexcavation; the prior patent technology is only used for checking the overbreak or controlling the device and the like. The influence of over excavation on the collapse of the deeply-buried rectangular tunnel is lacked, the collapse range of the over-excavated tunnel is large, and the collapse height and width are large, so that the subsequent treatment and reinforcement are directly influenced.
The invention provides a theoretical calculation method for evaluating the influence of the overexcavation of the deep-buried rectangular tunnel on collapse; and the influence of the over-excavation height and the over-excavation width on the collapse of the deeply-buried rectangular tunnel can be obtained by changing relevant parameters such as the over-excavation height and the over-excavation width, so that reference is provided for the collapse treatment under the influence of the over-excavation. The method can be applied to underground deep-buried rectangular traffic tunnels, and can also be applied to analysis on the influence of the over excavation on the collapse in other forms of underground engineering of deep-buried rectangular sections, such as deep-buried rectangular hydraulic tunnels, deep-buried rectangular roadways and the like, so that theoretical method guidance is provided for determining the over excavation influence and reinforcing and preventing the collapse.
Drawings
Fig. 1 is a schematic view of collapse of an overbreak tunnel according to an embodiment of the present invention.
In the context of figure 1 of the drawings,Hthe height of the collapse area of the tunnel;Lhalf the width of the collapse zone;bthe width of the rectangular tunnel is general;hin order to achieve the over-digging height,tthe width of the overbreak is adopted;f(x)is in a collapsed shapeA shape function;va maneuvering allowable speed field;xin a rectangular coordinate systemxThe axis coordinate values.
FIG. 2 is a graph showing the effect of different overbreak heights on slump height, slump width, and slump area.
FIG. 3 is a graph showing the effect of different overbreak widths on collapse height, collapse width and collapse area.
Detailed Description
The invention is further described below with reference to the figures and examples.
The specific data of the project of the embodiment are as follows: study of overbreak heighthWhen the influence is given, the values of other parameters are respectively as follows:A=0.3，B=0.7，σ c =5MPa，σ t =σ c /100，γ=20kN/m 3 ，t=1.5m, b =10m, H =5 m. Height of overbreakhSix conditions of 0m, 0.2m, 0.4m, 0.6m, 0.8m and 1.0m are respectively selected for calculation.
Study of overbreak widthtIn the event of (2) the effect of (c),A=0.3，B=0.7，σ c =5MPa，σ t =σ c /100，γ=20kN/m 3 ，h=0.6m, b =10m, H =5 m. Over-cut angletSix conditions of 0m, 0.5m, 1m, 1.5m, 2m and 2.5m are respectively selected for calculation.
Referring to fig. 1, the method for calculating the influence of the overbreak of the top plate of the deep-buried rectangular tunnel on the collapse according to the embodiment is as follows:
(1) determining an overexcavation shape and an overexcavation area according to the overexcavation condition of the top plate of the deep-buried rectangular tunnel; the overbreak shape is simplified to a triangle, and the overbreak area is determined by the following formula.
Figure 469457DEST_PATH_IMAGE001
。
In the formula, Sc is the area of the overexcavation region; h is the overbreak height, and t is the overbreak width.
(2) And calculating the gravity work of the collapsed body of the deeply buried rectangular tunnel, which is determined by the following formula.
Figure 70202DEST_PATH_IMAGE002
。
In the formula, P γ Acting for the gravity of the deeply buried rectangular tunnel collapse body; l is half of the width of the collapse area; gamma is the surrounding rock gravity; (x) is a collapsed shape function; v is the maneuver allowable velocity field; and x is the coordinate value of the x axis in the rectangular coordinate system.
(3) And calculating the internal energy dissipation of the deep-buried rectangular tunnel collapse body, which is determined by the following formula.
Figure 690802DEST_PATH_IMAGE003
。
In the formula, P D Internal energy dissipation of the collapsed body of the deeply buried rectangular tunnel;
Figure 300775DEST_PATH_IMAGE004
compressive strength of the complete surrounding rock; A. b is a surrounding rock parameter;
Figure 64331DEST_PATH_IMAGE005
the tangent slope of f (x), i.e., the first derivative;
Figure 711345DEST_PATH_IMAGE006
the tensile strength of the surrounding rock.
(4) According to the minimum energy consumption principle and the boundary conditions, the collapse range and the collapse quantity of the deep-buried rectangular tunnel are solved, and the method comprises the following steps.
And (I) constructing a function by gravity work and internal energy dissipation of a deeply buried rectangular tunnel collapse body.
Figure 458721DEST_PATH_IMAGE007
。
In the formula:
Figure 606805DEST_PATH_IMAGE008
the difference between the internal energy dissipation of the collapsed rectangular tunnel body and the collapse body weight is worked;
Figure 349502DEST_PATH_IMAGE009
is a general function.
And (II) according to the variation principle of the general function, obtaining a corresponding Euler equation as follows.
Figure 823209DEST_PATH_IMAGE010
。
Combining with the boundary conditions, the solution can be obtained:
Figure 526723DEST_PATH_IMAGE011
。
in the formula, H is the height of a collapse area of a top plate of the deeply-buried rectangular tunnel;
Figure 88285DEST_PATH_IMAGE012
。
(III) from the geometric conditions.
Figure 92013DEST_PATH_IMAGE013
。
So that:
Figure 205463DEST_PATH_IMAGE014
。
(IV) according to the law of conservation of energy, namely the gravity work of the collapsed body of the deeply buried rectangular tunnel is equal to the dissipation of internal energy, so that the energy-saving tunnel can be obtained.
Figure 287951DEST_PATH_IMAGE015
。
And (V) combining the formulas in the steps (III) and (IV) to form an equation system, so that the collapse height H and the collapse width 2L can be obtained, and the collapse size, namely the collapse area, can be obtained according to the following formula.
Figure 777838DEST_PATH_IMAGE016
。
(VI) according to the above, combining the actual over-excavation condition to obtain the collapse range caused by the over-excavation of the top plate of the deep-buried rectangular tunnel, including the collapse area, the collapse height, the collapse width and the like; and (3) changing relevant parameters such as the over-excavation height, the over-excavation width and the like to obtain the influence of the over-excavation height, the over-excavation width and the over-excavation area on the collapse of the deeply-buried rectangular tunnel, thereby providing theoretical method guidance for determining the over-excavation influence and the reinforcement and prevention of the collapse.
According to the above method steps, the influence of different overbreak heights and overbreak widths on the collapse height, the collapse width and the collapse area can be obtained, as shown in fig. 2 and fig. 3. As can be seen from the figure, with overbreak heighthAnd width of overbreaktThe collapsed surface is enlarged in shape, the collapsed width is gradually increased, and the collapsed height is also gradually increased, so that the area of the collapsed surface is increased.

Claims (1)

1. A calculation method for determining the influence of the overexcavation of a top plate of a deep-buried rectangular tunnel on collapse is characterized by comprising the following steps:
(1) determining an overexcavation shape and an overexcavation area according to the overexcavation condition of the top plate of the deep-buried rectangular tunnel; the overbreak shape is simplified into a triangle, and the overbreak area is determined by the following formula:
Figure 890361DEST_PATH_IMAGE001
；
in the formula, Sc is the area of the overexcavation region; h is the overbreak height, and t is the overbreak width;
(2) calculating the gravity of the collapsed square body of the deeply-buried rectangular tunnel to do work, wherein the gravity is determined by the following formula:
Figure 123896DEST_PATH_IMAGE002
；
in the formula, P γ Doing work for the gravity of the collapsed square body of the deeply-buried rectangular tunnel; l is half of the width of the collapse area; gamma is the surrounding rock gravity; (x) is a collapsed shape function; v is the maneuver allowable velocity field; x is an x-axis coordinate value in a rectangular coordinate system;
(3) calculating the internal energy dissipation of the deep-buried rectangular tunnel collapse body, which is determined by the following formula:
Figure 111706DEST_PATH_IMAGE003
；
in the formula, P D Internal energy dissipation of the collapsed body of the deeply buried rectangular tunnel;
Figure 88889DEST_PATH_IMAGE004
compressive strength of the complete surrounding rock; A. b is a surrounding rock parameter;
Figure 219656DEST_PATH_IMAGE005
the tangent slope of f (x), i.e., the first derivative;
Figure 765038DEST_PATH_IMAGE006
tensile strength of the surrounding rock;
(4) according to the minimum energy consumption principle and boundary conditions, the collapse range and the collapse amount of the deeply buried rectangular tunnel are solved, and the method comprises the following steps of:
the method comprises the following steps that (I) the following functions are constructed by the gravity work and internal energy dissipation of a deeply buried rectangular tunnel collapse body:
Figure 614046DEST_PATH_IMAGE007
；
in the formula:
Figure 581871DEST_PATH_IMAGE008
the difference between internal energy dissipation of a collapsed rectangular tunnel body and collapse body weight work is calculated;
Figure 973669DEST_PATH_IMAGE009
is a general function;
(II) according to the variation principle of the general function, the corresponding Euler equation is obtained as follows:
Figure 549007DEST_PATH_IMAGE010
；
combining with the boundary conditions, the solution can be obtained:
Figure 885310DEST_PATH_IMAGE011
；
in the formula, H is the height of a collapse area of a top plate of the deeply-buried rectangular tunnel;
Figure 830395DEST_PATH_IMAGE012
；
(III) from the geometric conditions, it is known that:
Figure 935754DEST_PATH_IMAGE013
；
so that:
Figure 681993DEST_PATH_IMAGE014
；
(IV) according to the law of conservation of energy, namely the gravity work of the collapsed body of the deeply buried rectangular tunnel is equal to the dissipation of internal energy, the method can be obtained as follows:
Figure 380959DEST_PATH_IMAGE015
；
(V) combining the formulas of the steps (III) and (IV) to form an equation system, so that the collapse height H and the collapse width 2L can be solved, and the collapse size, namely the collapse area, can be obtained by the following formula:
Figure 503635DEST_PATH_IMAGE016
；
(VI) according to the above, combining the actual over-excavation condition to obtain the collapse range caused by the over-excavation of the top plate of the deep-buried rectangular tunnel, including the collapse area, the collapse height, the collapse width and the like; and (3) changing relevant parameters such as the over-excavation height, the over-excavation width and the like to obtain the influence of the over-excavation height, the over-excavation width and the over-excavation area on the collapse of the deeply-buried rectangular tunnel, thereby providing theoretical method guidance for determining the over-excavation influence and the reinforcement and prevention of the collapse.
CN202210548785.0A 2022-05-20 2022-05-20 Calculation method for determining influence of over excavation of top plate of deep-buried rectangular tunnel on collapse Pending CN114922686A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210548785.0A CN114922686A (en) 2022-05-20 2022-05-20 Calculation method for determining influence of over excavation of top plate of deep-buried rectangular tunnel on collapse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210548785.0A CN114922686A (en) 2022-05-20 2022-05-20 Calculation method for determining influence of over excavation of top plate of deep-buried rectangular tunnel on collapse

Publications (1)

Publication Number Publication Date
CN114922686A true CN114922686A (en) 2022-08-19

Family

ID=82808963

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210548785.0A Pending CN114922686A (en) 2022-05-20 2022-05-20 Calculation method for determining influence of over excavation of top plate of deep-buried rectangular tunnel on collapse

Country Status (1)

Country Link
CN (1) CN114922686A (en)

Similar Documents

Publication Publication Date Title
CN102306225B (en) Method for simulating construction course and tunnel deformation influence value of multiline overlapping tunnel
CN107330194B (en) Numerical simulation analysis method for influence of shield tunnel excavation on adjacent pile group foundation
CN106988302B (en) A kind of high inclination-angle competent bed rotary digging pile driving construction engineering method
CN105240019A (en) Pipe jacking construction method
CN111898184B (en) Analysis method for influence of shallow-buried underground tunnel pipe curtain reinforcement on ground and pile foundation
CN104631475A (en) Safe and fast construction method of down-traversing river shallow depth bored tunnel
CN102943479A (en) System and method for controlling deformation of deep and large foundation pit through partition unloading
Yang et al. Performance of overlapped shield tunneling through an integrated physical model tests, numerical simulations and real-time field monitoring
Liu et al. Effect of an incremental change in external water pressure on tunnel lining: a case study from the Tongxi karst tunnel
CN112200445B (en) Method for evaluating protective effect of grouting ring of newly-built tunnel on existing shield tunnel
Ma et al. The influence of shallow buried double-line parallel rectangular pipe jacking construction on ground settlement deformation
CN105672327B (en) A kind of design and construction method of minor diameter vertical shaft high polymer grouting excavation supporting structure
CN114818082A (en) Method for evaluating influence of over excavation of deep tunnel on collapse of arch part
CN114922686A (en) Calculation method for determining influence of over excavation of top plate of deep-buried rectangular tunnel on collapse
CN208917856U (en) For the constructing structure on aerial leakage stratum in deep hole impervious wall construction
CN102829246A (en) Arrangement method for jacking pipe of circular caisson
CN103527217B (en) Small-curvature-radius shield tunnel duct piece under dense pile foundation environment and manufacturing method thereof
CN115809498A (en) Longitudinal deformation calculation method for existing line penetrating through deep-buried shield tunnel
CN112160757B (en) Method for evaluating grouting reinforcement effect of existing tunnel in shield tunnel downward-penetrating engineering
CN102829245A (en) Method for arranging jacking pipe of rectangular open caisson
CN203741782U (en) Multi-section face plate structure of high concrete faced rockfill dam
CN112884292A (en) Method for analyzing influence of sandy cobble stratum shield construction parameter control on surface settlement
CN208294522U (en) Waterproof of man in a kind of pilot tunnel of rich water sand-pebble layer
CN115186324A (en) Method for evaluating influence of shallow tunnel overexcavation on collapse of arch
CN206570631U (en) A kind of shallow embedding shield driven tunnel crossing highway construction pre-pouring grout constructing structure

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination