CN108022027B - Prediction method for soil output when shield passes through surrounding rock contact zone - Google Patents
Prediction method for soil output when shield passes through surrounding rock contact zone Download PDFInfo
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- CN108022027B CN108022027B CN201810116168.7A CN201810116168A CN108022027B CN 108022027 B CN108022027 B CN 108022027B CN 201810116168 A CN201810116168 A CN 201810116168A CN 108022027 B CN108022027 B CN 108022027B
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- 239000011435 rock Substances 0.000 title claims abstract description 66
- 239000002689 soil Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000005641 tunneling Effects 0.000 claims abstract description 42
- 238000010276 construction Methods 0.000 claims description 13
- 238000009412 basement excavation Methods 0.000 claims description 7
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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- G06Q10/04—Forecasting or optimisation specially adapted for administrative or management purposes, e.g. linear programming or "cutting stock problem"
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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
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
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Abstract
A method for predicting the soil output when a shield passes through a surrounding rock contact zone comprises the following steps: firstly, fitting a curve of a surrounding rock contact zone into one or more functions f (X) by taking the shield tunneling direction as an X axis and the vertical direction of a cutter head plane as a Y axis through geological exploration; cutter head diameter d, as shown in FIG. 1; secondly, acquiring the time t required by the cutter head to tunnel for a unit distance in the soft rock before the shield tunneling machine does not enter the surrounding rock contact zoneb(ii) a Thirdly, collecting the time t required by the cutterhead to tunnel the same unit distance in the hard rock in the earlier stage of contacting the hard rock of the shield tunneling machine or acquiring the time t required by the cutterhead to tunnel the same unit distance in the hard rock according to the past experiencea(ii) a Fourth, the total earth output C per unit distance is calculated according to the following formula. The calculated soil output is input into the shield machine in advance, so that the working parameters of the shield machine, such as the rotating speed of the soil cabin cutter pressing disc and the like, can be in the optimal state, and the tunneling speed can be improved.
Description
Technical Field
The invention relates to a construction technology, in particular to a technology for tunnel construction by using a texture machine, and specifically relates to a method for predicting soil discharge when a shield passes through a surrounding rock contact zone.
Background
A shield machine is a tunnel boring machine using a shield method. The shield construction method is a "shield" (referred to as a supporting segment) for constructing (laying) a tunnel while a heading machine is heading, and is different from an open construction method. Internationally, generalized shield machines can also be used in rock formations, as distinguished only from open (non-shield) tunnel boring machines. In China, the tunnel boring machine used for the soft soil stratum is customarily called a (narrow sense) shield machine, and the tunnel boring machine used for the rock stratum is called a (narrow sense) TBM.
In the full-face tunnel boring machine, a shield method is adopted in one part, and an open construction method is adopted in the other part, for example, the full-face double-shield rock Tunnel Boring Machine (TBM) which is independently developed by Chinese iron heavy construction does not need to construct (lay) the shield of the tunnel, namely, does not need to lay a segment, but integrates excavation, support and slag discharge into a whole, thereby realizing one-step forming of the tunnel.
The basic working principle of the shield tunneling machine is that a cylindrical steel component is pushed forwards along the axis of the tunnel to excavate soil. The casing of the cylinder assembly, the shield, acts as a temporary support for the excavated, not yet lined tunnel section, bearing the pressure of the surrounding soil layers and sometimes also the groundwater pressure and the water that is trapped outside. The operations of digging, dumping, lining and the like are carried out under the shield of the shield.
When the shield tunneling machine passes through a single surrounding rock, the soil output amount of the cutterhead in the tunneling process is generally fixed, and the tunneling speed of all positions of the cutterhead is equivalent. And when the blade disc passed the country rock contact zone, the country rock of blade disc quotation department was different because of hard degree this moment, and the equidirectional tunnelling efficiency that will appear same blade disc has the score of height, promptly: the tunneling efficiency of the soft rock part is high, and the tunneling efficiency of the hard rock part is low, so that the soil output of the soft rock part and the soil output of the hard rock part are different under the condition that the rotating speed of the whole cutter head is the same, the cutter head is required to be kept on a designed fixed plane, and large-scale soil body settlement can occur due to uneven soil output.
The shield tunneling process is difficult to avoid the situation of surrounding rock change, and the soil output at the surrounding rock change contact zone is a problem needing important attention, because the problem is not only related to shield and attitude adjustment, but also related to synchronous grouting, later secondary grouting and the like, and any point improper treatment of the problems can cause serious influence on the surrounding environment. The soil output of the shield in the tunneling process is estimated in advance, and the method has an important guiding effect on later-stage construction.
Disclosure of Invention
The invention aims to solve the problems that when a surrounding rock contact zone is excavated in the existing shield construction process, a shield needs to spend a long time to collect relevant parameters after entering, and because the surrounding rock distribution is uncertain, and the acquisition of the parameters is also difficult, in order to obtain accurate parameters beneficial to later construction, the cost is high, the debugging period is long, the accuracy is poor, the construction efficiency is influenced, and even the soil body is settled.
The technical scheme of the invention is as follows:
a method for predicting the soil output when a shield passes through a surrounding rock contact zone is characterized by comprising the following steps:
firstly, fitting a curve of a surrounding rock contact zone into one or more functions f (X) by taking the shield tunneling direction as an X axis and the vertical direction of a cutter head plane as a Y axis through geological exploration;
secondly, acquiring the time t required by the cutter head to tunnel for a unit distance in the soft rock before the shield tunneling machine does not enter the surrounding rock contact zoneb；
Thirdly, the hard rock is collected in the early stage of contacting the shield tunneling machine or obtained according to the past experienceThe time t required by the cutterhead for tunneling the same unit distance in the hard rocka；
Fourth, the total earth output C per unit distance is calculated according to the following formula:
C＝∫Sa·dxa+∫Sb·dxa·k
in the formula:
k is approximately a constant when the properties of the two kinds of surrounding rocks are unchanged, and k is more than or equal to 1 according to the shield working principle and the properties of the surrounding rocks;
Sb＝πr2-Sa
and r is d/2, and d is the diameter of the cutter head.
The constant k and the surrounding rock contact zone function f (x) are adjusted according to the excavation speed in the construction process; the shield tunneling machine needs to improve the tunneling efficiency.
After the obtained soil output is calculated in advance, various parameters such as soil bin pressure, cutter head rotating speed and the like during the tunneling of the shield tunneling machine are set in advance, so that the phenomenon that the feasibility debugging of relevant parameters is carried out after the cutter head tunnels to the surrounding rock is avoided, and the cost and the risk in the shield tunneling process are greatly reduced; and the tunnel excavation parameter can be adjusted at any time according to actual conditions in the tunneling process, and the tunnel excavation parameter is collected to form the effect of mutual and reciprocal assistance.
The invention has the beneficial effects that:
according to the damage method, most of needed parameters can be collected before the shield machine enters the contact zone, and when the later possible soil output is calculated in advance, various parameters such as soil bin pressure, cutter head rotating speed and the like during tunneling of the shield machine can be set in advance, so that the phenomenon that the feasibility debugging of relevant parameters is carried out after the cutter head tunnels to surrounding rocks can be avoided to a great extent, and the cost and risk in the shield tunneling process are greatly reduced. And the tunnel excavation parameter can be adjusted at any time according to actual conditions in the tunneling process, and the tunnel excavation parameter is collected to form the effect of mutual and reciprocal assistance.
The invention can lead the working parameters of the shield machine, such as the rotating speed of the soil cabin cutter pressing disc, and the like to be in the optimal state by inputting the calculated soil output into the shield machine in advance, thereby being beneficial to improving the tunneling speed.
The method guides the later shield construction by arranging the data information in the earlier stage, and can reduce the cost required in the shield tunneling and the possible risks in the shield tunneling to a certain extent.
Drawings
FIG. 1 is a schematic longitudinal section coordinate diagram of a contact zone of surrounding rock of the present invention.
FIG. 2 is a schematic cross-sectional coordinate diagram of a contact zone of the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1-2.
A method for predicting the soil output when a shield passes through a surrounding rock contact zone comprises the following steps:
firstly, fitting a curve of a surrounding rock contact zone into one or more functions f (X) by taking the shield tunneling direction as an X axis and the vertical direction of a cutter head plane as a Y axis through geological exploration; cutter head diameter d, as shown in FIG. 1;
secondly, acquiring the time t required by the cutter head to tunnel for a unit distance in the soft rock before the shield tunneling machine does not enter the surrounding rock contact zoneb；
Thirdly, collecting the time t required by the cutterhead to tunnel the same unit distance in the hard rock in the earlier stage of contacting the hard rock of the shield tunneling machine or acquiring the time t required by the cutterhead to tunnel the same unit distance in the hard rock according to the past experiencea；
Fourth, the total earth output C per unit distance is calculated according to the following formula.
The details are as follows:
order:
wherein: t is taThe time required for the cutterhead to tunnel for one unit distance in the hard rock;
tbthe time required for the cutterhead to tunnel for one unit distance in the soft rock;
k can be approximately regarded as a constant when the properties of the two kinds of surrounding rocks are basically unchanged, and k is more than or equal to 1 according to the shield working principle and the properties of the surrounding rocks. If the two kinds of surrounding rock properties are found to be greatly changed, the k value is adjusted in real time;
order SaIs the hard rock area of the cross section in front of the cutter head, SbThe soft rock area of the cross section in front of the cutter head can be obtained by combining the figures 1 and 2:
Sb＝πr2-Sa (1-3)
wherein: r ═ d/2
The total unearthed amount of the cutterhead tunneling one unit is C, wherein the unearthed part of the hard rock is CaPartial unearthing of soft rock CbAnd then:
C＝Ca+Cb (1-4)
the following equations can be obtained by combining the calculus equations according to FIGS. 1 and 2 and the above equations:
Ca＝∫Sa·dxa (1-5)
Ca＝∫Sb·dxb(1-6) wherein: dx (x)a＝Va·ta
dxb＝Vb·tb
VaFor hard rock driving speed, VbThe soft soil tunneling speed;
because soft, hard country rock is all in the blade disc department, so the tunnelling speed is the same, namely Va equals Vb, then:
therefore, the method comprises the following steps:
dxb＝dxa·k (1-8)
therefore, the method comprises the following steps:
C＝Ca+Cb
＝∫Sa·dxa+∫Sb·dxb
＝∫Sa·dxa+∫Sb·dxa·k (1-9)
by combining the above formulas, the shield tunneling machine only needs to collect t when tunneling to the surrounding rock contact zonea、tbAnd an approximate trend relationship function f (x) for the contact zone of surrounding rock, wherein: t is tbCan be collected before entering the contact zone, taCan be collected at the early stage of the tunneling contact zone or obtained according to past experience, and f (x) can be roughly described according to a survey result chart, wherein all the parameters can be correspondingly adjusted at the later stage so as to adapt to the tunneling requirement.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (3)
1. A method for predicting the soil output when a shield passes through a surrounding rock contact zone is characterized by comprising the following steps:
firstly, fitting a curve of a surrounding rock contact zone into one or more functions f (X) by taking the shield tunneling direction as an X axis and the vertical direction of a cutter head plane as a Y axis through geological exploration;
secondly, acquiring the time t required by the cutter head to tunnel for a unit distance in the soft rock before the shield tunneling machine does not enter the surrounding rock contact zoneb；
Thirdly, collecting the time t required by the cutterhead to tunnel the same unit distance in the hard rock in the earlier stage of contacting the hard rock of the shield tunneling machine or acquiring the time t required by the cutterhead to tunnel the same unit distance in the hard rock according to the past experiencea；
Fourth, the total earth output C per unit distance is calculated according to the following formula:
C＝∫Sa·dxa+∫Sb·dxa·k
in the formula:
k is approximately a constant when the properties of the two kinds of surrounding rocks are unchanged, and k is more than or equal to 1 according to the shield working principle and the properties of the surrounding rocks;
Sb＝πr2-Sa
and r is d/2, d is the diameter of the cutterhead, and f (x) is a function of the contact zone of the surrounding rock.
2. The method of claim 1 wherein the constant k, the band-contact function f (x), is adjusted during construction based on the excavation speed.
3. The method as claimed in claim 1, wherein the earth pressure and the cutter head rotation speed during the shield tunneling machine tunneling are set in advance after the obtained earth output is calculated in advance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810116168.7A CN108022027B (en) | 2018-02-06 | 2018-02-06 | Prediction method for soil output when shield passes through surrounding rock contact zone |
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| CN201810116168.7A CN108022027B (en) | 2018-02-06 | 2018-02-06 | Prediction method for soil output when shield passes through surrounding rock contact zone |
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| CN108022027A CN108022027A (en) | 2018-05-11 |
| CN108022027B true CN108022027B (en) | 2021-06-25 |
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| CN114810100B (en) * | 2022-06-28 | 2022-12-02 | 中铁工程服务有限公司 | Shield tunneling attitude prediction method based on deep neural network |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101131090A (en) * | 2007-10-09 | 2008-02-27 | 中铁二局股份有限公司 | Construction method for shallow soil-covered river bed under shield tunnel |
| CN102707081A (en) * | 2012-06-19 | 2012-10-03 | 上海地铁盾构设备工程有限公司 | On-line measurement device for residue soil discharge volume in shield construction based on laser velocity measurement |
| CN106121662A (en) * | 2016-05-06 | 2016-11-16 | 同济大学 | Backbreak region synchronous grouting dynamic compensation of shield digging local fills control method |
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2018
- 2018-02-06 CN CN201810116168.7A patent/CN108022027B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101131090A (en) * | 2007-10-09 | 2008-02-27 | 中铁二局股份有限公司 | Construction method for shallow soil-covered river bed under shield tunnel |
| CN102707081A (en) * | 2012-06-19 | 2012-10-03 | 上海地铁盾构设备工程有限公司 | On-line measurement device for residue soil discharge volume in shield construction based on laser velocity measurement |
| CN106121662A (en) * | 2016-05-06 | 2016-11-16 | 同济大学 | Backbreak region synchronous grouting dynamic compensation of shield digging local fills control method |
Non-Patent Citations (2)
| Title |
|---|
| 复合地层盾构近距离下穿既有成型隧道风险控制研究;吴庆红;《隧道/地下工程》;20171230;第76-80、84页 * |
| 盾构掘进中软土地层地表沉降与出土量关系研究;刘新科;《上海建设科技》;20171230(第3期);第9-13页 * |
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