CN111456739A - Tunnel step method construction method based on finite elements - Google Patents
Tunnel step method construction method based on finite elements Download PDFInfo
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- CN111456739A CN111456739A CN202010159071.1A CN202010159071A CN111456739A CN 111456739 A CN111456739 A CN 111456739A CN 202010159071 A CN202010159071 A CN 202010159071A CN 111456739 A CN111456739 A CN 111456739A
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- excavation
- tunnel
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- finite element
- steps
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- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000010276 construction Methods 0.000 title claims abstract description 34
- 238000009412 basement excavation Methods 0.000 claims abstract description 43
- 238000004364 calculation method Methods 0.000 claims abstract description 10
- 238000012544 monitoring process Methods 0.000 claims abstract description 9
- 230000000007 visual effect Effects 0.000 claims abstract description 9
- 238000011156 evaluation Methods 0.000 claims abstract description 8
- 238000004088 simulation Methods 0.000 claims abstract description 8
- 239000002689 soil Substances 0.000 claims abstract description 7
- 238000005457 optimization Methods 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 239000011378 shotcrete Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims 1
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/003—Arrangement of measuring or indicating devices for use during driving of tunnels, e.g. for guiding machines
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a finite element-based tunnel step method construction method, and relates to a tunnel excavation method, which comprises the following steps: and establishing a numerical simulation model, performing numerical simulation calculation, and installing on site. According to the method, visual models of all sections of the step excavation are created through finite elements, the stress state of the section and the stress states of other sections during each step of step excavation are analyzed, stability evaluation is carried out, support parameters in the next step are adjusted in real time by combining actual monitoring data, and support parameters which are caused by multiple soil body disturbances in the excavation process are prevented from being inconsistent with the actual conditions. The method can greatly improve the safety of the tunnel bench method excavation process, reduce the engineering cost, shorten the construction period and obtain better social benefit and economic benefit.
Description
Technical Field
The invention relates to a tunnel excavation method, in particular to a finite element-based tunnel step method construction method.
Background
Along with the rapid development of highway engineering in China, more and more mountain-penetrating tunnels are used. The tunnel construction method comprises a full-section excavation method, a step method, an annular excavation core soil retaining method, a middle partition wall method, a cross middle partition wall method and the like. The step method has enough working space and equivalent construction speed, the tunnel step method construction is an information dynamic adjustment process, the dynamic optimization of the construction scheme mainly comprises the optimization of excavation footage and support parameters, the optimization aims to improve the construction efficiency as much as possible and reduce the cost on the safe basis, and essentially relates to the mechanical analysis and optimization problem of tunnel construction, but the excavation frequency is increased for multiple steps, so that the disturbance frequency of surrounding rocks is increased, and the safety risk is increased to a certain extent.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a finite element-based tunnel step method construction method.
In order to achieve the purpose, the invention adopts the technical scheme that: a tunnel step method construction method based on finite elements comprises the following steps:
(1) establishing a numerical simulation model
Firstly, establishing visual models of each section of step method segmental excavation based on finite elements, simulating excavation stages of a grotto by setting different excavation steps, performing the steps at different load release rates, and additionally setting an anchor-shotcrete support or a lining structure to simulate the influence of the construction time of the support, thereby achieving the purpose of simulating the grotto excavation and support construction process;
(2) numerical simulation calculation
Determining a transverse calculation range, a vertical calculation range and boundary conditions according to the section size of the tunnel, analyzing the stress state of the section and the stress states of other sections during each step of step excavation, performing stability evaluation, and implementing advanced support according to the stress states and the stability evaluation;
(3) installation in situ
Firstly, arranging monitoring measurement points, transmitting data to a finite element analysis system in real time, dynamically correcting relevant support parameters according to actual monitoring data during each excavation, excavating an arc guide pit at the upper part of a tunnel, performing primary support, excavating upper steps to reserve core soil, excavating steps of the second step, the third step and the like in a staggered mode in sequence from left to right, performing primary support, and finally excavating the bottom of the tunnel in sections and performing primary support; applying an inverted arch and filling.
Preferably, step (1) further comprises: the finite element step establishing method is characterized in that a tunnel unit is subjected to grid division, a grid close to a structure is dense, a grid far from the structure is sparse, a finite element grid is generated after discrete optimization, and the number of units and the number of nodes are determined.
Preferably, step (2) further comprises: and vertical pressure is applied to the top of the boundary condition, horizontal and vertical constraint are applied to the bottom of the boundary condition, and horizontal constraint is applied to the left side and the right side of the boundary condition.
Preferably, step (1) further comprises: in the process of establishing the visual model, the beam units and the anchor rod units are set to be dead units, and when excavation and supporting are carried out, the beam units and the anchor rod units are activated according to actual construction steps.
Preferably, during primary support, temporary support is needed, the temporary support is to be supported at the upper and lower bench excavation parts of the main tunnel, and the temporary support is made of 18-gauge I-steel.
Preferably, the advance support is implemented by using a small advance guide pipe.
The invention has the beneficial effects that: and establishing visual models of all sections of the step excavation by finite element, analyzing the stress state of the section and the stress states of other sections when each step of step excavation, evaluating the stability, and adjusting the support parameters of the next step in real time by combining actual monitoring data, so as to avoid the support parameters which are caused by multiple soil disturbance in the excavation process from being inconsistent with the actual conditions. The method can greatly improve the safety of the tunnel bench method excavation process, reduce the engineering cost, shorten the construction period and obtain better social benefit and economic benefit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The embodiment provided by the invention comprises the following steps: a tunnel step method construction method based on finite elements comprises the following steps:
(1) establishing a numerical simulation model
Firstly, establishing visual models of each section of step method segmental excavation based on finite elements, simulating excavation stages of a grotto by setting different excavation steps, performing the steps at different load release rates, and additionally setting an anchor-shotcrete support or a lining structure to simulate the influence of the construction time of the support, thereby achieving the purpose of simulating the grotto excavation and support construction process;
(2) numerical simulation calculation
Determining a transverse calculation range, a vertical calculation range and boundary conditions according to the section size of the tunnel, analyzing the stress state of the section and the stress states of other sections during each step of step excavation, performing stability evaluation, and implementing advanced support according to the stress states and the stability evaluation;
(3) installation in situ
Firstly, arranging monitoring measurement points, transmitting data to a finite element analysis system in real time, dynamically correcting relevant support parameters according to actual monitoring data during each excavation, excavating an arc guide pit at the upper part of a tunnel, performing primary support, excavating upper steps to reserve core soil, excavating steps of the second step, the third step and the like in a staggered mode in sequence from left to right, performing primary support, and finally excavating the bottom of the tunnel in sections and performing primary support; applying an inverted arch and filling.
Wherein: the step (1) further comprises: the finite element step establishing method is that a tunnel unit is subjected to grid division, a grid close to a structure is dense, a grid far from the structure is sparse, a finite element grid is generated after discrete optimization, and the number of units and the number of nodes are determined; the step (2) further comprises: applying vertical pressure to the top of the boundary condition, adding horizontal and vertical constraints to the bottom of the boundary condition, and applying horizontal constraints to the left side and the right side of the boundary condition; the step (1) further comprises: in the process of establishing the visual model, the beam units and the anchor rod units are firstly set as dead units, and when excavation and supporting are carried out, the beam units and the anchor rod units are activated according to actual construction steps; during primary supporting, temporary supports are required, the temporary supports are supported at the upper step excavation part and the lower step excavation part of the main tunnel, and the temporary supports are made of 18-size I-steel; the advance support is implemented by adopting an advanced small conduit.
According to the method, visual models of all sections of the step excavation are created through finite elements, the stress state of the section and the stress states of other sections during each step of step excavation are analyzed, stability evaluation is carried out, support parameters in the next step are adjusted in real time by combining actual monitoring data, and support parameters which are caused by multiple soil body disturbances in the excavation process are prevented from being inconsistent with the actual conditions. The method can greatly improve the safety of the tunnel bench method excavation process, reduce the engineering cost, shorten the construction period and obtain better social benefit and economic benefit.
It is to be understood that the invention is not limited to the specific embodiments described above, but is intended to cover various insubstantial modifications of the inventive process concepts and solutions, or its application to other applications without modification.
Claims (6)
1. A tunnel step method construction method based on finite elements is characterized by comprising the following steps:
(1) establishing a numerical simulation model
Firstly, establishing visual models of each section of step method segmental excavation based on finite elements, simulating excavation stages of a grotto by setting different excavation steps, performing the steps at different load release rates, and additionally setting an anchor-shotcrete support or a lining structure to simulate the influence of the construction time of the support, thereby achieving the purpose of simulating the grotto excavation and support construction process;
(2) numerical simulation calculation
Determining a transverse calculation range, a vertical calculation range and boundary conditions according to the section size of the tunnel, analyzing the stress state of the section and the stress states of other sections during each step of step excavation, performing stability evaluation, and implementing advanced support according to the stress states and the stability evaluation;
(3) installation in situ
Firstly, arranging monitoring measurement points, transmitting data to a finite element analysis system in real time, dynamically correcting relevant support parameters according to actual monitoring data during each excavation, excavating an arc guide pit at the upper part of a tunnel, performing primary support, excavating upper steps to reserve core soil, excavating steps of the second step, the third step and the like in a staggered mode in sequence from left to right, performing primary support, and finally excavating the bottom of the tunnel in sections and performing primary support; applying an inverted arch and filling.
2. The finite element-based tunnel step method construction method according to claim 1, wherein the finite element-based tunnel step method construction method comprises the following steps: the step (1) further comprises: the finite element step establishing method is characterized in that a tunnel unit is subjected to grid division, a grid close to a structure is dense, a grid far from the structure is sparse, a finite element grid is generated after discrete optimization, and the number of units and the number of nodes are determined.
3. The finite element-based tunnel step method construction method according to claim 1, wherein the finite element-based tunnel step method construction method comprises the following steps: the step (2) further comprises: and vertical pressure is applied to the top of the boundary condition, horizontal and vertical constraint are applied to the bottom of the boundary condition, and horizontal constraint is applied to the left side and the right side of the boundary condition.
4. A finite element-based tunnel step method construction method based on claim 1, characterized in that: the step (1) further comprises: in the process of establishing the visual model, the beam units and the anchor rod units are set to be dead units, and when excavation and supporting are carried out, the beam units and the anchor rod units are activated according to actual construction steps.
5. A finite element-based tunnel step method construction method based on claim 1, characterized in that: during preliminary bracing, need carry out interim support, interim support will be strutted at the upper and lower bench excavation position in main hole, and interim support adopts 18I-steel preparation to form.
6. The finite element-based tunnel step method construction method according to claim 1, wherein the finite element-based tunnel step method construction method comprises the following steps: the advance support is implemented by adopting an advanced small conduit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010159071.1A CN111456739A (en) | 2020-03-09 | 2020-03-09 | Tunnel step method construction method based on finite elements |
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| CN202010159071.1A CN111456739A (en) | 2020-03-09 | 2020-03-09 | Tunnel step method construction method based on finite elements |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112765864A (en) * | 2021-02-04 | 2021-05-07 | 中交四公局第五工程有限公司 | Method for analyzing stress deformation in process of simulating excavation of weak surrounding rock of tunnel |
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| CN103195443A (en) * | 2013-04-02 | 2013-07-10 | 山东科技大学 | Deep mining method capable of optimizing support parameters and preventing roadway delaying water gushing |
| CN104598296A (en) * | 2015-01-23 | 2015-05-06 | 陈建永 | Numerical simulation analysis method for deformation of soft soil deep foundation pit |
| CN110195598A (en) * | 2019-06-14 | 2019-09-03 | 浙江交工路桥建设有限公司 | A kind of highway tunnel construction integrated control method |
| CN110259458A (en) * | 2019-07-01 | 2019-09-20 | 中铁七局集团有限公司 | The construction method that small-clear-distance tunnel Shallow Section double -side approach excavates |
| CN110688696A (en) * | 2019-09-16 | 2020-01-14 | 中铁第五勘察设计院集团有限公司 | Parameter determination method and device for tunnel supporting structure |
-
2020
- 2020-03-09 CN CN202010159071.1A patent/CN111456739A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103195443A (en) * | 2013-04-02 | 2013-07-10 | 山东科技大学 | Deep mining method capable of optimizing support parameters and preventing roadway delaying water gushing |
| CN104598296A (en) * | 2015-01-23 | 2015-05-06 | 陈建永 | Numerical simulation analysis method for deformation of soft soil deep foundation pit |
| CN110195598A (en) * | 2019-06-14 | 2019-09-03 | 浙江交工路桥建设有限公司 | A kind of highway tunnel construction integrated control method |
| CN110259458A (en) * | 2019-07-01 | 2019-09-20 | 中铁七局集团有限公司 | The construction method that small-clear-distance tunnel Shallow Section double -side approach excavates |
| CN110688696A (en) * | 2019-09-16 | 2020-01-14 | 中铁第五勘察设计院集团有限公司 | Parameter determination method and device for tunnel supporting structure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112765864A (en) * | 2021-02-04 | 2021-05-07 | 中交四公局第五工程有限公司 | Method for analyzing stress deformation in process of simulating excavation of weak surrounding rock of tunnel |
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