CN117313583A - Determination method for outburst prevention thickness and critical water pressure of tunnel excavation on fault upper disc - Google Patents

Determination method for outburst prevention thickness and critical water pressure of tunnel excavation on fault upper disc Download PDF

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CN117313583A
CN117313583A CN202311375781.8A CN202311375781A CN117313583A CN 117313583 A CN117313583 A CN 117313583A CN 202311375781 A CN202311375781 A CN 202311375781A CN 117313583 A CN117313583 A CN 117313583A
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fault
critical
point
water pressure
tunnel
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刘文娟
周鲁云
安永林
谭格宇
李生辉
郭晋东
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Hunan University of Science and Technology
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Hunan University of Science and Technology
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04—Lining with building materials
    • E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04—Lining with building materials
    • E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
    • E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
    • 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
    • E21F16/00—Drainage
    • E21F16/02—Drainage of tunnels
    • 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
    • G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/08—Fluids
    • 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
    • G06F2119/06—Power analysis or power optimisation
    • 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

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

Abstract

The invention discloses a method for determining the anti-bursting thickness and critical water pressure of a fault upper disc tunnel excavation. Firstly, calculating the geometric relation between the dimensions of the broken surface of a tunnel on a fault, then respectively calculating the external power of the water pressure of the fault and the internal energy dissipation power of surrounding rock, and finally determining the critical water pressure when the water burst of the fault is broken when the distance from the tunnel excavation to the fault is known according to the external power equal to the internal energy dissipation power; or determining a critical anti-burst thickness of the tunnel from the fault when the fault water pressure is known. The invention provides a calculation method for determining the critical water pressure and the critical outburst prevention thickness when the water outburst of the tunnel face of the fault upper disc tunnel is destroyed; according to the method, whether water burst is generated in the excavation of the fault upper disc tunnel or not and whether the burst prevention thickness meets the requirements or not can be evaluated, and basis is provided for treatment measures such as water drainage, depressurization, grouting reinforcement and the like, for example, under high water pressure, the water pressure is reduced to be lower than the critical water pressure; or grouting to improve the strength of the surrounding rock, so that water burst can be effectively avoided; meanwhile, the method can determine the critical anti-bursting thickness and the critical water pressure of the upper tunnel excavation under different fault dip angles.

Description

Determination method for outburst prevention thickness and critical water pressure of tunnel excavation on fault upper disc
Technical Field
The invention belongs to the technical field of tunnel water burst mud burst damage evaluation and prevention and control, and particularly relates to a determination method of burst prevention thickness and critical water pressure of tunnel excavation of a fault upper disc.
Background
Faults are poor geology often encountered in tunnel and underground engineering construction, in particular fault fracture zones. In the construction of the water-rich or underwater fault fracture zone, disasters such as water burst, cement burst and the like often occur, and great loss is caused to the engineering. Therefore, the development of tunnel fault water inrush research has very important engineering significance and scientific value.
At present, numerical simulation or empirical formulas are mostly adopted for determining the burst prevention thickness of the tunnel fault burst, and few researches on the burst prevention thickness and critical water pressure of the underwater or high-pressure water-rich tunnel fault are carried out, so that the existing literature and patent are mostly measures adopted for analyzing a specific fault tunnel, and a theoretical analysis method cannot be provided.
Disclosure of Invention
The invention aims to provide a method for determining the anti-bursting thickness and the critical water pressure of the tunnel excavation of a fault upper disc. The invention can judge whether the tunnel fault water burst and the burst-preventing thickness meet the requirements, and provide theoretical basis for grouting reinforcement, water drainage, depressurization and other treatment measures, for example, under high water pressure, the water pressure is reduced to be lower than the critical water pressure; or grouting to improve the strength of the surrounding rock, so that water burst can be effectively avoided; meanwhile, the method can determine the critical anti-bursting thickness and the critical water pressure of the upper tunnel excavation under different fault dip angles.
The invention relates to a method for determining the anti-bursting thickness and critical water pressure of a fault upper disc tunnel excavation, which comprises the following steps in sequence:
(1) The geometrical relationship between the dimensions of the disc tunnel failure surface on the fault is determined as follows:
；
；
；
；
；
；
；
wherein:L OJ is the length between the O point and the J point; d is the tunnel excavation height;φis the internal friction angle of surrounding rock;L KJ the length between the K point and the J point is the anti-protruding thickness;L OE is the length between the point O and the point E;ais the fault dip angle;L JE is the length between the J point and the E point;L OF is the length between the O point and the F point;L JF is the length between the J point and the F point;L BE is the length between the point B and the point E;L AF is the length between the point A and the point F;
(2) Fault water pressure external force power:
；
wherein: w is the external power of the fault water pressure;P W is the pressure of fault water;v 0 is the break speed on the fracture surface;
(3) The internal energy dissipation power of the surrounding rock is as follows:
；
wherein: e (E) D Power is dissipated for the surrounding rock energy;cis the cohesive force of surrounding rocks;
(4) The principle of conservation of energy, namely that the external power of the fault water pressure is equal to the internal energy dissipation power of surrounding rock:
；
；
；
(5) Critical head height:
；
wherein: h W Is critical head height;is the weight of water.
Compared with the prior art and the research method, the invention has the following advantages:
at present, numerical simulation or empirical formulas are mostly adopted for determining the burst prevention thickness of the tunnel fault burst, and researches on the burst prevention thickness and critical water pressure of the underwater or high-pressure water-rich tunnel fault are few, so that the existing literature and patent mostly are measures adopted for analyzing a specific fault tunnel, and a theoretical analysis method cannot be provided.
The method is used for fault inclination angleaAnd anti-protruding thicknessL KJ Under the known condition, the critical fault water pressure P when the water burst of the fault upper disc tunnel is destroyed can be obtained W Critical head height H corresponding to W The method comprises the steps of carrying out a first treatment on the surface of the Or at fault water pressure P W Inclination angle of faultaUnder the known condition, the critical outburst prevention thickness when the water outburst of the tunnel on the fault is destroyed can be reversely calculatedL KJ . And can determine different fault inclinationsaAnd excavating a critical anti-burst thickness and a critical water pressure of the lower upper disc tunnel.
The invention provides a calculation method for determining the anti-bursting thickness and the critical water pressure when the tunnel on the fault is excavated and burst water is damaged; according to the method, whether the tunnel is water bursting or not and whether the bursting prevention thickness meets the requirements or not can be judged, theoretical basis is provided for treatment measures such as water drainage, depressurization, grouting reinforcement and the like, and if the water pressure is high, the water pressure is reduced below the critical water pressure; or grouting to improve the strength of the surrounding rock, so that water burst can be effectively avoided; meanwhile, the method can determine the critical anti-bursting thickness and the critical water pressure of the upper tunnel excavation under different fault dip angles.
The method of the invention can also be applied to the judgment of whether water burst occurs at the water-rich fault of underground building structures such as mining roadways, hydraulic tunnels and the like, the determination of critical water pressure and critical burst prevention thickness and the like.
Drawings
FIG. 1 is a schematic diagram of the method of the present invention.
FIG. 2 is a graph showing the relationship between the critical water pressure and the critical water head height according to the embodiment of the present invention.
FIG. 3 is a graph showing the relationship between the anti-protrusion thickness and the critical head height at different fault inclinations according to the embodiment of the present invention.
FIG. 4 is a graph showing the relationship between the fault inclination angle and the critical head height when the anti-protrusion thickness is 5m according to the embodiment of the present invention.
FIG. 5 is a graph showing the relationship between the fault inclination angle and the critical anti-protrusion thickness at a head height of 30m according to an embodiment of the present invention.
In the figure, D is the tunnel excavation height; h is tunnel buriedDeep;φis the internal friction angle of surrounding rock; h W Is critical head height;P W is the pressure of fault water;ais the fault dip angle;v 0 is the break speed at the fracture surface.
Description of the embodiments
The invention is described in further detail below with reference to the drawings and examples.
Referring to fig. 1, the principle schematic diagram of the method for determining the anti-burst thickness and the critical water pressure of the tunnel excavation of the upper fault disc of the invention is shown.
Firstly, according to tunnel engineering profile, surrounding rock grade, fault occurrence and water level, obtaining related parameters such as surrounding rock cohesive force c and surrounding rock internal friction angleφTunnel excavation height D, fault inclination angleaAnti-protruding thicknessL KJ Etc.
The specific calculation steps are as follows:
the first step: the geometrical relationship between the dimensions of the disc tunnel failure surface on the fault is determined as follows:
；
；
；
；
；
；
；
wherein:L OJ is the length between the O point and the J point; d is the tunnel excavation height;φis the internal friction angle of surrounding rock;L KJ the length between the K point and the J point is the anti-protruding thickness;L OE is the length between the point O and the point E;ais the fault dip angle;L JE is the length between the J point and the E point;L OF is the length between the O point and the F point;L JF is the length between the J point and the F point;L BE is the length between the point B and the point E;L AF is the length between the point A and the point F;
and a second step of: fault water pressure external force power:
；
wherein: w is the external power of the fault water pressure;P W is the pressure of fault water;v 0 is the break speed on the fracture surface;
and a third step of: the internal energy dissipation power of the surrounding rock is as follows:
；
wherein: e (E) D Power is dissipated for the surrounding rock energy;cis the cohesive force of surrounding rocks;
fourth step: the principle of conservation of energy, namely that the external power of the fault water pressure is equal to the internal energy dissipation power of surrounding rock:
；
；
；
fifth step: critical head height:
；
wherein: h W Is critical head height;is the weight of water.
The above equation is an explicit equation for the cohesive force of surrounding rockcInternal friction angle of surrounding rock of 100kPaφ25 degrees, the tunnel excavation height D is 7m, and the fault inclination anglea60 degrees of water weightIs 10kN/m 3 According to the above steps, the critical water pressure and critical water head height under different anti-burst thickness can be obtained, as shown in fig. 2. Further, the anti-burst thickness and critical head height at different fault inclinations can be obtained, as shown in fig. 3. Further, the relation between the fault inclination angle and the critical head height at the protrusion preventing thickness of 5m can be obtained as shown in fig. 4. Further, when the head height is 30m, the relationship between the fault inclination angle and the critical anti-protrusion thickness can be obtained, as shown in fig. 5. As can be seen from the figures: with the increase of the anti-bursting thickness, the critical water pressure and the critical water head height are increased, and the gradient is larger and larger; under a certain water head height, the critical anti-bursting thickness gradually decreases along with the increase of the fault inclination angle; under a certain outburst prevention thickness, the critical water head height is gradually increased along with the increase of the fault inclination angle.

Claims (1)

1. A method for determining the anti-bursting thickness and critical water pressure of a fault upper disc tunnel excavation is characterized by comprising the following steps in sequence:
(1) The geometrical relationship between the dimensions of the disc tunnel failure surface on the fault is determined as follows:
；
；
；
；
；
；
；
wherein:L OJ is the length between the O point and the J point; d is the tunnel excavation height;φis the internal friction angle of surrounding rock;L KJ the length between the K point and the J point is the anti-protruding thickness;L OE is the length between the point O and the point E;ais the fault dip angle;L JE is the length between the J point and the E point;L OF is the length between the O point and the F point;L JF is the length between the J point and the F point;L BE is the length between the point B and the point E;L AF is the length between the point A and the point F;
(2) Fault water pressure external force power:
；
wherein: w is the external power of the fault water pressure;P W is the pressure of fault water;v 0 is the break speed on the fracture surface;
(3) The internal energy dissipation power of the surrounding rock is as follows:
；
wherein: e (E) D Power is dissipated for the surrounding rock energy;cis the cohesive force of surrounding rocks;
(4) The principle of conservation of energy, namely that the external power of the fault water pressure is equal to the internal energy dissipation power of surrounding rock:
；
；
；
(5) Critical head height:
；
wherein: h W Is critical head height;is the weight of water;
inclination of faultaAnd anti-protruding thicknessL KJ Under the known condition, the critical fault water pressure P when the water burst of the fault upper disc tunnel is destroyed can be obtained W Critical head height H corresponding to W The method comprises the steps of carrying out a first treatment on the surface of the Or at fault water pressure P W Inclination angle of faultaUnder the known condition, the critical outburst prevention thickness when the water outburst of the tunnel on the fault is destroyed can be reversely calculatedL KJ . And can determine different fault inclinationsaAnd excavating a critical anti-burst thickness and a critical water pressure of the lower upper disc tunnel.
CN202311375781.8A 2023-10-23 2023-10-23 Determination method for outburst prevention thickness and critical water pressure of tunnel excavation on fault upper disc Pending CN117313583A (en)

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CN202311375781.8A CN117313583A (en) 2023-10-23 2023-10-23 Determination method for outburst prevention thickness and critical water pressure of tunnel excavation on fault upper disc

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Application Number Priority Date Filing Date Title
CN202311375781.8A CN117313583A (en) 2023-10-23 2023-10-23 Determination method for outburst prevention thickness and critical water pressure of tunnel excavation on fault upper disc

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