CN107742032B - One kind is for soil deformation calculation method caused by ground suction/discharge type shield tunneling under shallow earthing operating condition - Google Patents
One kind is for soil deformation calculation method caused by ground suction/discharge type shield tunneling under shallow earthing operating condition Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 64
- 238000004364 calculation method Methods 0.000 title claims abstract description 22
- 230000005641 tunneling Effects 0.000 title claims abstract description 17
- 238000009412 basement excavation Methods 0.000 claims abstract description 10
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Abstract
The present invention relates to one kind for soil deformation calculation method caused by ground suction/discharge type shield tunneling under shallow earthing operating condition, includes the following steps: that (1) parameter calculates: tan β parameter calculates, g parameter calculates；(2) calculating of soil deformation restrains model based on the tunnel excavation section at the top of newly-established tunnel upward floating to soil boundary, utilizes stochastic medium theory, take a micro unit, it is derived by ground suction/discharge type shield tunnel construction and causes x, the soil deformation calculation formula in tri- directions y, z.The beneficial effects of the present invention are: the present invention has extensively studied the convergence model of shallow earthing ground suction/discharge type shield tunneling section, the angle α of tunnel upward floating and shield axis and horizontal plane after slip casting caused by consideration earthing is shallower, based on stochastic medium theory, the soil deformation calculation formula derived can quickly calculate the vertical deformation of the soil body and horizontal distortion in Practical Project with Matlab.
Description
Technical field
It is damaged to calculate by the soil body the present invention relates to a kind of with stochastic medium theory and novel tunnel excavated section convergence model
The calculation method of shallow earthing ground suction/discharge type shield soil deformation caused by losing.Belong to underground engineering technical field.
Background technique
Ground suction/discharge type shield construction buried depth is shallower, especially larger to the disturbance of the shallow section soil body of earthing, it is possible to draw
The destruction of Adjacent Underground Pipeline and building is sent out, there are serious security risks.Existing ground suction/discharge type shield construction draws
It plays soil deformation calculation method and all only considers to face upward and tunnel operating condition and do not account for test driving, and do not account under shallow earthing operating condition
The influence of tunnel upward floating is only capable of calculating soil body vertical deformation, can not calculate horizontal soil deformation, is gone out with reality
Enter.
Summary of the invention
The purpose of the present invention is overcoming deficiency in the prior art, provide a kind of reasonably for ground under shallow earthing operating condition
Soil deformation calculation method caused by suction/discharge type shield tunneling.
For soil deformation calculation method caused by ground suction/discharge type shield tunneling under shallow earthing operating condition, including walk as follows
It is rapid:
S1. parameter calculates
S1.1tan β parameter calculates
According to formula:
In formula: tan β is the main influence tangent of an angle value of tunnel perimeter soil layer；β is the main influence of tunnel perimeter soil layer
Angle；K is surface settlement trough width parameter；H is shield tunnel axis buried depth；
Shield tunnel axis buried depth formula:
H=h-tan α (2)
In formula: h is original tunnel axis buried depth；
Joint type (1), (2) obtain:
S1.2g parameter calculates
G is equivalent ground loss parameter, and ε is maximum ground loss rate, and R is shield machine outer radius, g and ground loss rate ε
Between relationship, using formula:
The purpose of this step is to determine input parameter for the calculating of soil deformation；
S2. the calculating of soil deformation
Model is restrained based on the tunnel excavation section at the top of newly-established tunnel upward floating to soil boundary；R is outside shield machine
Radius, g are equivalent ground loss parameter；Using stochastic medium theory, a micro unit is taken, is derived by ground suction/discharge type shield tunnel
Road construction causes x, the soil deformation calculation formula in tri- directions y, z；
Along the horizontal deformation of soil body at worked calculation formula of tunneling direction:
With the horizontal deformation of soil body at worked formula of tunnel vertical direction:
The vertical vertical deformation calculation formula of the soil body:
In formula: β is the main influence angle of tunnel perimeter soil layer；H is shield tunnel axis buried depth；Triple integral bound point
Not are as follows: a=H+R, b=H-R, e=H-R, f=H+R-g,
The beneficial effects of the present invention are: this patent has extensively studied the convergence of shallow earthing ground suction/discharge type shield tunneling section
Model considers the angle α of tunnel upward floating and shield axis and horizontal plane after the shallower caused slip casting of earthing, is based on random medium
Theory, the soil deformation calculation formula derived can quickly calculate the vertical deformation of the soil body in Practical Project with Matlab
And horizontal distortion.By this patent theoretical formula, to the soil deformation in the suction/discharge type shield-tunneling construction of practical shallow earthing operating condition ground
Size is predicted there is prevention and directive function to engineering, and for from now in relation to the ground suction/discharge type shield of shallow earthing operating condition
The research that structure construction influences aspect to surrounding enviroment is provided fundamental basis.
Detailed description of the invention
Fig. 1 is mechanical model schematic diagram；
Fig. 2 is ground suction/discharge type shield tunneling section convergent pathway；
Fig. 3 is to excavate cell schematics；
Fig. 4 is the 60th ring measuring point longitudinal pump curve；
Fig. 5 is the 33rd ring measuring point transverse direction earth's surface subsidence curve；
Fig. 6 is the horizontal deformation of soil body at worked curve of the 65th ring measuring point along longitudinal direction；
Fig. 7 is the horizontal deformation of soil body at worked curve of the 65th ring measuring point transversely.
Specific embodiment
The present invention is described further below with reference to embodiment.The explanation of following embodiments is merely used to help understand this
Invention.It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, also
Can be with several improvements and modifications are made to the present invention, these improvement and modification also fall into the protection scope of the claims in the present invention
It is interior.
This patent establishes the convergence model of the tunnel excavation section at the top of tunnel upward floating to soil boundary, is managed based on random medium
By the soil deformation calculation method due to caused by ground loss when establishing shallow earthing ground suction/discharge type shield tunnel construction can have
The soil deformation of shallow earthing section (the outer machine diameter of≤0.5 times of shield) in effect prediction ground suction/discharge type shield construction.Ground goes out
Enter formula shield mechanics model, as shown in Figure 1.
X is the horizontal distance from excavation face in figure, is positive with tunneling direction；Y is the transversely and horizontally distance of off-axis line；Z is
Vertical distance from the ground, to be positive downwards；α is the angle (face upward for positive value, test is negative value) of shield axis and horizontal plane.
One kind that this patent provides is calculated for soil deformation caused by ground suction/discharge type shield tunneling under shallow earthing operating condition
Method, including following 2 steps:
1. parameter calculates
1.1 tan β parameters calculate
According to formula:
In formula: tan β is the main influence tangent of an angle value of tunnel perimeter soil layer；β is the main influence of tunnel perimeter soil layer
Angle；K is surface settlement trough width parameter；H is shield tunnel axis buried depth.
Shield tunnel axis buried depth formula:
H=h-tan α (2)
In formula: h is original tunnel axis buried depth.
Joint type (1), (2) obtain:
1.2g parameter calculates
G is equivalent ground loss parameter, and ε is maximum ground loss rate, and R is shield machine outer radius, g and ground loss rate ε
Between relationship, using formula:
The purpose of this step is to determine input parameter for the calculating of soil deformation.
2. the calculating of soil deformation
It is as shown in Figure 2 based on the tunnel excavation section convergence model at the top of newly-established tunnel upward floating to soil boundary.Figure
Middle R is shield machine outer radius, and g is equivalent ground loss parameter.Using stochastic medium theory, a micro unit is taken, as shown in figure 3,
It is derived by ground suction/discharge type shield tunnel construction and causes x, the soil deformation calculation formula in tri- directions y, z.
Along the horizontal deformation of soil body at worked calculation formula of tunneling direction (longitudinal direction):
With the horizontal deformation of soil body at worked formula of tunnel vertical direction (transverse direction):
The vertical vertical deformation calculation formula of the soil body:
In formula: β is the main influence angle of tunnel perimeter soil layer；H is shield tunnel axis buried depth；Triple integral bound point
Not are as follows: a=H+R, b=H-R, e=H-R, f=H+R-g,
Above formula is compiled into corresponding computer program using MATLAB, inputs relevant calculating parameter, can facilitate
The tunnel surrounding soil due to caused by ground loss that calculates in the suction/discharge type shield-tunneling construction of ground deform.
This patent is with Nanjing in " ground suction/discharge type shield tunnel construction deformation characteristic and control research " text of Wu Huiming
It is background that the airport mound Xian Mo station~general way station section ground, which enters and leaves section engineering, is applied using single line ground suction/discharge type shield method
Work.
Embodiment 1:
Parameter value: the overburden layer of the 60th ring measuring point of tunnel is with a thickness of 0.5D=3.1m.Calculating parameter value: h=6.2m,
D=6.2m, ε=0.096% the, according to " practical approach of generated by tunnel construction displacement and building deformation prediction of Han Xuan
Research " value research in a text about surface settlement trough width parameter k, this example takes k=0.50, and α=- 2.6 °.
Step 1: calculating parameter value, when calculating ground settlement according to parameter value, the 60th ring measuring point of tunnel is along excavation
Tunneling direction tan β is that the main influence tangent of an angle value of tunnel perimeter soil layer calculates to obtain following value relationship according to formula (3)
Formula:
When calculating ground settlement according to parameter value, the 60th ring measuring point of tunnel is damaged along the equivalent soil body for excavating tunneling direction
Parameter g is lost to calculate according to formula (4)
Step 2: by step 1 parameter calculated, and the basic parameter provided substitutes into formula (7) utilized MATLAB volume
Corresponding computer program is made, inputs coordinates computed, ground settlement value, typing Excel table is calculated in record.
Step 3: the calculating data that are calculated using step 2 and DataDig352 software are from " the ground suction/discharge type shield of Teng Li
The monitoring of method tunneling technique (GPST) construction Deformation and analysis and research " contain the data taken out in corresponding data figure, In in a text
Curve graph is drawn in Excel table.
Step 4: analysis graph, it was therefore concluded that.As shown in Figure 4: (1) when shield test is tunneled, ground loss mainly draws
Ground settlement is played, and concentrates on excavation face rear, the sedimentation value maximum (4.2mm) about at the 25m of excavation face rear；(2) herein
Calculated result, " monitoring of ground suction/discharge type shield tunnel technology (GPST) construction Deformation and analysis and research " this article side with Teng Li
Method longitudinal pump finite element modelling value and measured data are relatively coincide, and show that new established model and calculation method have herein
Certain reliability；(3) at excavation face rear, trend is obviously reduced in measured settlement, is rubbed since context of methods does not account for shield shell
Power and additional grouting pressure are wiped, and measured data has certain deviation.
Embodiment 2:
Parameter value: the overburden layer of the 33rd ring measuring point of tunnel is with a thickness of 0.3D=1.86m.Calculating parameter value: h=
4.96m, D=6.2m, ε=0.107%, according to Han Xuan " generated by tunnel construction displacement and building deformation prediction it is practical
Technique study " value research in a text about surface settlement trough width parameter k, this example takes k=0.50, and α=- 1.2 °.
Implementation steps are carried out with embodiment 1, step 1 to 3 according to corresponding operating condition and parameter value.Only step 4 is carried out
It introduces.
Step 4: analysis graph, it was therefore concluded that.It is as shown in Figure 5: (1) context of methods the calculated result, " shield with Zhao Xinwei
Structure quickly passes through that method is ultra-shallow earth-covered and negative earthing constructing tunnel forecast analysis " this article method transverse direction ground settlement finite element modelling value
And measured data very coincide, context of methods calculate maximum value ratio Zhao Xinwei " shield quickly pass through method it is ultra-shallow earth-covered and
Negative earthing constructing tunnel forecast analysis " in finite element sedimentation the analogue value be more nearly measured value, show this paper Theory Solution have can
By property；(2) lateral earth's surface settlement influence range is away from tunnel axis two sides 8m or so, and maximum settlement value is in 5mm or so；(3) by
Ground loss is only considered in context of methods, therefore surface uplift does not occur in calculated result.Actual measurement and finite element modelling are away from tunnel
There is small protuberance in the position of axis 8m or so.
Embodiment 3:
Parameter value: the overburden layer of the 65th ring measuring point of tunnel is with a thickness of 0.5D=3.1m.Calculating parameter value: h=6.2m,
D=6.2m, ε=0.35%, according to Han Xuan, " practical approach of generated by tunnel construction displacement and building deformation prediction is ground
Study carefully " value research about surface settlement trough width parameter k in text, this example takes k=0.50, and α=- 2.6 °.
Implementation steps are the same as embodiment 2.
Step 4: analysis graph, it was therefore concluded that.It is as shown in Figure 6: (1) context of methods calculated result and the " ground Wu Huiming
Suction/discharge type shield tunnel construction deformation characteristic and control research " text in measured data coincide substantially, show this paper Theory Solution
Reliability；(2) horizontal deformation of soil body at worked along longitudinal direction is negative value, i.e., mobile towards shield tail direction, this is because the original of ground loss
Cause；(3) horizontal deformation of soil body at worked along longitudinal direction is affected on tunnel axis top, the ratio that maximum deformation value controls in Practical Project
Preferably, maximum value is less than 3mm.
It is as shown in Figure 7: (1) context of methods calculated result and Wu Huiming " ground suction/discharge type shield tunnel construction deformation characteristic
And control research " measured data in text coincide substantially, show this paper Theory Solution with reliability；(2) attached in vertical depth 4m
Near position, horizontal distortion direction are changed, and generate movement outward in the 0-4m soil body, 4m or less is then moved to tunnel direction
It is dynamic；(3) top of the lateral horizontal deformation of soil body at worked at left and right sides of tunnel axis is affected, maximum deformation value in Practical Project
Control it is relatively good, the soil body transversely and horizontally deformation values range -4mm arrive 3mm.
Claims (1)
1. one kind exists for soil deformation calculation method caused by ground suction/discharge type shield tunneling under shallow earthing operating condition, feature
In including the following steps:
S1. parameter calculates
S1.1tan β parameter calculates
According to formula:
In formula: tan β is the main influence tangent of an angle value of tunnel perimeter soil layer；β is the main influence angle of tunnel perimeter soil layer；k
For surface settlement trough width parameter；H is shield tunnel axis buried depth；
Shield tunnel axis buried depth formula:
H=h-tan α (2)
In formula: h is original tunnel axis buried depth；
Joint type (1), (2) obtain:
S1.2g parameter calculates
G is equivalent ground loss parameter, and ε is maximum ground loss rate, and R is shield machine outer radius, between g and ground loss rate ε
Relationship, using formula:
The purpose of this step is to determine input parameter for the calculating of soil deformation；
S2. the calculating of soil deformation
Model is restrained based on the tunnel excavation section at the top of newly-established tunnel upward floating to soil boundary；R is shield machine outer radius,
G is equivalent ground loss parameter；Using stochastic medium theory, a micro unit is taken, ground suction/discharge type shield tunnel is derived by and applies
Work causes x, the soil deformation calculation formula in tri- directions y, z；
Along the horizontal deformation of soil body at worked calculation formula of tunneling direction:
With the horizontal deformation of soil body at worked formula of tunnel vertical direction:
The vertical vertical deformation calculation formula of the soil body:
In formula: β is the main influence angle of tunnel perimeter soil layer；H is shield tunnel axis buried depth；Triple integral bound difference
Are as follows: a=H+R, b=H-R, e=H-R, f=H+R-g,
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| CN113158427B (en) * | 2021-03-17 | 2021-11-02 | 北京交通大学 | Shield tunneling machine soil body relative displacement calculation method based on guide data |
| CN114722578B (en) * | 2022-03-17 | 2024-06-07 | 中铁第一勘察设计院集团有限公司 | Tunnel earth surface subsidence calculation method |
| CN114961751B (en) * | 2022-05-17 | 2023-03-31 | 浙江大学 | Method for predicting soil body displacement caused by shield tunneling in soil-rock composite stratum |
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| EP2039881A1 (en) * | 2007-09-18 | 2009-03-25 | Bouygues Travaux Publics | Process for determining additives used in tunnel boring machines and device |
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| CN106250618A (en) * | 2016-07-28 | 2016-12-21 | 浙江大学城市学院 | Ground suction/discharge type shield-tunneling construction causes the computational methods of underground utilities moment of flexure and strain |
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