CN110222444B - Calculation method for sediment accumulation body form during bottom throwing of trailing suction hopper dredger - Google Patents

Abstract

The invention discloses a calculation method of sediment accumulation body form during bottom throwing of a trailing suction hopper dredger, which comprises the following steps: (1) Collecting data of the trailing suction hopper dredger under the condition of a bottom throwing operation mode; (2) Establishing a sand throwing shape function according to the sand throwing amount and the water depth of a sand throwing point; (3) Establishing a particle size coefficient function according to the water depth of the sand throwing point and the particle size of the sediment; (4) And fitting the sand throwing shape function, the particle size coefficient function and the established physical model to obtain a stacking shape function. According to the invention, a physical model is built through collected historical data of the trailing suction hopper dredger under the condition of a bottom throwing operation mode, the relation formula of the underwater sediment accumulation body under the condition of the bottom throwing operation mode of the dredging dredger is summarized and fitted, and the form of the underwater sediment accumulation body is rapidly calculated according to the mud throwing amount, the mud throwing water depth and the sediment particle size of the bottom throwing operation of the dredging dredger, so that the operation mode of the dredging dredger is guided and optimized.

Description

A Calculation Method for the Shape of Sediment Accumulation During Bottom Throwing of Trailing Suction Dredger

technical field

The invention belongs to the technical field of real-time forecasting, and in particular relates to a method for rapidly calculating the shape of a large-scale trailing suction dredger bottom throwing sediment deposits.

Background technique

The development of my country's dredging industry has a history of hundreds of years. Driven by the wave of economic globalization and the rapid development of international trade, in order to meet the needs of the large-scale development of container and tanker transportation, various parts of my country have built ports, widened and deepened coastal waterways. In order to improve the navigation capacity, the dredging industry has developed rapidly. At the same time, with the development of ports, waterways, farmland water conservancy and coastal cities, the field of dredging operations has also been extended to a large extent. Farmland water conservancy and reservoir construction and maintenance, national defense engineering construction, environmental protection dredging, land reclamation and other fields.

Trailing suction dredger is a kind of dredger that digs while walking, and all the work of dredging, loading and unloading is completed by itself. The drag-suction ship excavates the waterway by dredging and filling the cabin. After the cabin is full, it sails to the dumping area, where the dredged soil from the cabin is unloaded into the water, and then returns to digging to repeat the previous round of work. After the dredged sediment is transported to the destination, further disposal will be carried out according to the purpose of dredging, the characteristics and availability of the sediment, including land reclamation, beach maintenance, sea disposal, land disposal, isolation disposal, etc. Dredging sediment disposal is the final stage of the dredging project. Different disposal locations have different impacts on the environment: (1) If underwater disposal is adopted, fine-grained sediment will spread and move around to varying degrees under the action of hydrodynamic forces. ; (2) If land disposal is adopted, such as land reclamation and beach maintenance, the main pollution will mainly come from the residual water discharge and overflow during the mud-water separation process; (3) In addition, if no corresponding protection measures are taken , Land disposal of dredged sediment may also have a negative impact on the quality of groundwater near the disposal site.

At present, with the requirements of environmental protection and engineering design, higher requirements are put forward for fine construction techniques such as underwater smoothness of dredging ship sediment treatment or dredging and reclamation. For example, the Port City of Colombo, Sri Lanka has grading requirements for underwater and above-water reclamation areas, and the three-runway project of Hong Kong Airport has requirements for layered reclamation. However, there are very few research results on the shape of dredging and mud dumping water accumulations, and the selection of ship mud dumping operation positions mostly depends on experience, which has a certain degree of blindness. Low cost, refined development.

Contents of the invention

Purpose of the invention: The purpose of the present invention is to address the deficiencies in the prior art and provide a method for quickly calculating the shape of the sediment accumulation body thrown at the bottom of a large trailing suction dredger, which can be quickly calculated through the fitted underwater sediment accumulation body relation The morphological characteristics of the sediment accumulation body guide and optimize the operation mode of the trailing suction dredger.

Technical solution: The method for calculating the shape of sediment deposits when the trailing suction dredger is thrown at the bottom of the present invention includes the following steps:

(1) Collect the data of the trailing suction dredger under the operation mode of bottom throwing, including the sand throwing volume V, the unit is cm ³ , the sediment particle size d, the unit is mm, and the water depth H of the sand throwing point, the unit is cm , as well as the slope, height and range data of the accumulation body, and establish a physical model;

(2) Establish sand throwing shape function according to sand throwing amount and water depth of sand throwing point:

f(h, V)=p1+p2*h+p3*h ² +p4*C+p5*C ² +p6*C ³ +p7*C ⁴ ;

Wherein h=lg(H), C=lg(V), p1, p2, p3, p4, p5 and p6 are coefficients;

(3) Establish a particle size coefficient function according to the water depth of the sand throwing point and the particle size of the sediment:

q(d, h)=k1+k2*d+k3*d ² +k4*d ³ +k5*h+k6*h ² ;

Where k1, k2, k3, k4, k5 and k6 are coefficients;

(4) The shape function of the accumulation body is obtained by fitting the sand throwing shape function, the particle size coefficient function and the established physical model:

F(h, V, d) = X ^{f(h, V)} *q(d, h);

F is the accumulation body shape function, including the slope, height and range of the accumulation body.

A further preferred technical solution of the present invention is that the value range of the sediment particle size d is: 0.3mm-1.3mm.

Preferably, the value range of the water depth H at the sand throwing point is greater than 5m.

Preferably, when calculating the slope of the accumulation body, in the sand throwing shape function of step (2), p1=-3.3178; p2=-0.3302; p3=0.0452; p4=3.1235; p5=-0.8622; p6=0.0946; p7 =-0.0036;

In the particle size coefficient function of step (3), k1=0.9735; k2=-2.7201; k3=5.2352; k4=-2.2379; k5=-0.0060; k6=2.62E-05.

Preferably, when calculating the height of the pile, in the sand throwing shape function of step (2), p1=-24.1340; p2=-1.0941; p3=0.1625; p4=21.2611; p5=-6.0073; p6=0.673E3; p7 =-0.025;

In the particle size coefficient function of step (3), k1=1.4231; k2=-6.4994; k3=9.9856; k4=-4.0253; k5=0.0061; k6=-6.05E-05.

Preferably, when calculating the range of the pile, in the sand throwing shape function of step (2), p1=-3.5276; p2=0.5018; p3=-0.0126; p4=3.4652; p5=-0.9884; p6=0.1164; p7= -0.004;

In the particle size coefficient function of step (3), k1=1.1590; k2=1.6047; k3=-3.0227; k4=1.2768; k5=-0.0007; k6=5.70E-06.

Beneficial effects: the present invention establishes a physical model through the collected historical data of the trailing suction dredger under the operation mode of bottom dumping, and summarizes and fits the relational expression of the shape of the underwater sediment deposit under the operation mode of dredging ship bottom dumping, Among them, the morphological parameters include the side slope, height and range of the accumulation body. Through the fitted relational expression of the underwater sediment accumulation body, the underwater sediment can be quickly calculated according to the amount of mud thrown, the depth of the mud thrown, and the size of the mud and sand in the dredging ship bottom throwing operation. The shape of the accumulation body guides and optimizes the operation mode of the dredging ship; during the operation of the dredging ship, through the quantification of the boundary conditions of the working conditions, it is possible to grasp the diffusion distribution and accumulation formation of the sediment in the unloading operation, which is convenient for timely adjustment The construction plan can reduce the workload of secondary handling and slope adjustment in the later stage, and reduce the project cost.

Description of drawings

Fig. 1 is the structural representation of trailing suction dredger of the present invention under throwing operation at the bottom;

Fig. 2 is a calculation flow chart of the present invention.

Detailed ways

The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the embodiments.

Embodiment: A calculation method for the form of sediment deposits when a trailing suction dredger is dumped at the bottom. Taking the "Xin Haifeng" dredging ship as a prototype, firstly collect the mud and sand deposits of the trailing suction dredger 1 under the condition of the bottom dumping operation mode. Data, including sand throwing volume V, unit is cm3, sediment particle size d, unit is mm, water depth H of sand throwing point, unit is cm, and the slope, height and range data of the accumulation body, and establish a physical model, mud The value range of the sand particle size d is: 0.3mm ~ 1.3mm, and the value range of the water depth H at the sand throwing point is greater than 5m.

Then, the sand throwing shape function is established according to the sand throwing amount, the water depth of the sand throwing point and the particle size of the sand:

f(h, V)=p1+p2*h+p3*h2+p4*C+p5*C2+p6*C3+p7*C4;

q(d, h)=k1+k2*d+k3*d2+k4*d3+k5*h+k6*h2;

Wherein, h=lg (H), C=lg (V), p1, p2, p3, p4, p5, p6, k1, k2, k3, k4, k5 and k6 are coefficients;

Finally, the packing shape function is obtained:

F(h, V, d)=Xf(h, V)*q(d, h);

F is the accumulation body shape function, including the slope, height and range of the accumulation body.

When calculating the slope of the accumulation body, p1=-3.3178; p2=-0.3302; p3=0.0452; p4=3.1235; p5=-0.8622; p6=0.0946; p7=-0.0036; k1=0.9735; k2=-2.7201; k3=5.2352; k4=-2.2379; k5=-0.0060; k6=2.62E-05.

When calculating the height of the pile, p1=-24.1340; p2=-1.0941; p3=0.1625; p4=21.2611; p5=-6.0073; p6=0.673E3; p7=-0.025; k1=1.4231; k2=-6.4994; k3 =9.9856; k4=-4.0253; k5=0.0061; k6=-6.05E-05.

When calculating the range of piles, p1=-3.5276; p2=0.5018; p3=-0.0126; p4=3.4652; p5=-0.9884; p6=0.1164; p7=-0.004; k1=1.1590; k2=1.6047; k3=- 3.0227; k4=1.2768; k5=-0.0007; k6=5.70E-06.

As stated above, while the invention has been shown and described with reference to certain preferred embodiments, this should not be construed as limiting the invention itself. Various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (6)

1. a calculation method of the shape of the sediment accumulation body when the bottom of a trailing suction dredger is thrown, it is characterized in that comprising the steps: (1) Collect the data of the trailing suction dredger under the operation mode of bottom throwing, including the sand throwing volume V, the unit is cm ³ , the sediment particle size d, the unit is mm, and the water depth H of the sand throwing point, the unit is cm , as well as the slope, height and range data of the accumulation body, and establish a physical model; (2) Establish sand throwing shape function according to sand throwing amount and water depth of sand throwing point: f(h, V)= p1+p2*h+p3*h ² +p4*C+p5*C ² +p6*C ³ +p7*C ⁴ ; Where h=lg(H), C=lg(V), p1, p2, p3, p4, p5, p6 and p7P7 are coefficients; (3) Establish a particle size coefficient function according to the water depth of the sand throwing point and the particle size of the sand: q(d, h)= k1+k2*d+k3*d ² +k4*d ³ +k5*h+k6*h ² ; Where h=lg(H), k1, k2, k3, k4, k5 and k6 are coefficients; (4) The accumulation body shape function is obtained by fitting the shape function of sand throwing, the particle size coefficient function and the established physical model: F(h, V, d) = X ^{f(h, V)} * q(d, h); F is the accumulation body shape function, including the slope, height and range of the accumulation body. 2. The method for calculating the shape of sediment deposits when the trailing suction dredger is dumped at the bottom according to claim 1, characterized in that: the range of the sediment particle size d is: 0.3 mm to 1.3 mm. 3. The method for calculating the shape of sediment deposits when the bottom of the trailing suction dredger is thrown according to claim 2, characterized in that: the value range of the water depth H at the sand throwing point is greater than 5m. 4. The method for calculating the shape of the sediment accumulation body when the trailing suction dredger bottom throws it according to claim 3, characterized in that: when calculating the slope of the accumulation body, in the sand throwing shape function of step (2), p1 =-3.3178; p2=-0.3302; p3=0.0452; p4=3.1235; p5=-0.8622; p6=0.0946; p7=-0.0036; In the particle size coefficient function in step (3), k1=0.9735; k2=-2.7201; k3=5.2352; k4=-2.2379; k5=-0.0060; k6=2.62*10 ^-5 . 5. The method for calculating the shape of the sediment accumulation body when the trailing suction dredger bottom throws it according to claim 3 is characterized in that: when calculating the height of the accumulation body, in the sand throwing shape function of step (2), p1= -24.1340; p2=-1.0941; p3=0.1625; p4=21.2611; p5=-6.0073; p6=0.673*10 ³ ; p7=-0.025; In the particle size coefficient function in step (3), k1=1.4231; k2=-6.4994; k3=9.9856; k4=-4.0253; k5=0.0061; k6=-6.05*10 ^-5 . 6. The method for calculating the shape of the sediment accumulation body when the trailing suction dredger bottom throws it according to claim 3, characterized in that: when calculating the range of the accumulation body, in the sand throwing shape function of step (2), p1= -3.5276 ; p2=0.5018 ; p3=-0.0126 ; p4=3.4652 ; p5=-0.9884 ; p6=0.1164 ; p7=-0.004; In the particle size coefficient function in step (3), k1=1.1590; k2=1.6047; k3=-3.0227; k4=1.2768; k5=-0.0007; k6=5.70*10 ^-6 .

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