CN106777568A - Full face rock tunnel boring machine cutterhead tunnels the determination method of load - Google Patents

Abstract

The invention discloses a method for determining the excavation load of a cutter head of a full-face rock excavation machine, which includes two parts: determining the thrust of the cutter head and determining the torque of the cutter head. The uniaxial compressive strength varies proportionally and as a power function with penetration and cutterhead diameter. The sum of the power exponents of penetration and cutterhead diameter is 2 for cutterhead driving thrust; the sum of power exponents of penetration and cutterhead diameter is 3 for cutterhead driving torque. It essentially reveals the relationship between the cutterhead excavation load and various parameters, and can calculate the cutterhead excavation load of the full-section rock roadheader in the entire excavation project under different geological conditions and operating states; the invention is a drive for hard rock excavation equipment. It provides basic data for the design of the transmission system and transmission system, and also provides a basis for the setting and real-time adjustment of thrust parameters and torque parameters during the construction process.

Description

Determination method of excavation load of cutter head of full-face rock boring machine

technical field

The invention belongs to the design, manufacture and construction technology of hard rock tunnel excavation equipment, in particular to a method for determining the excavation load of a cutter head of a full-section rock excavation machine.

Background technique

Full Face Rock Tunnel Boring Machine (abbreviated as TBM) is a large-scale special engineering equipment that integrates machinery, measurement and control, hydraulic pressure, electrical and electronic, computer and other high-tech, and is used for excavating underground passages. Due to its fast, high-quality, safe, economical and environmentally friendly advantages, the application of TBM in tunnel projects such as municipal administration, transportation, mining, water conservancy and hydropower in my country has grown rapidly. The cutterhead is assembled at the forefront of the equipment and is the direct excavation part of the TBM. The determination of the excavation load of the cutterhead is one of the core technologies in the design and construction of the TBM. On the one hand, in the forward design of the power system of the equipment, it is necessary to give the estimated value of the excavation load of the cutter head according to the construction geology, tunnel diameter, etc.; The tunneling load is adjusted in real time. If the load is not properly controlled, it may cause equipment damage and cause major disasters. The excavation load of the cutter head is closely related to factors such as geological conditions, equipment structure, and operating status, and the load values vary greatly among different projects. At present, there is still a lack of fast and effective means to determine the excavation load of the cutter head of the full-face rock boring machine, so it has become an urgent need in this industry.

Contents of the invention

The object of the present invention is to propose a method for determining the excavation load of the cutter head of a full-face rock excavation machine, so as to provide a basis for the design of the power system of the hard rock excavation equipment and on-site construction control.

In order to solve the above technical problems, the present invention proposes a method for determining the excavation load of a full-face rock boring machine cutter head, including: determining the thrust F of the cutter head and determining the excavation torque T of the cutter head, wherein, F=0.147CP ^a D ^b , T=8.733μCP ^c D ^d , C is the uniaxial compressive strength of the rock, P is the penetration, D is the cutterhead diameter, μ is the friction coefficient between the cutterhead and the rock, a=0.0～1.0 , b=1.0-2.0, c=0.0-1.5, d=1.5-3.0, and a+b=2, c+d=3.

Preferably: a=0.73, b=1.27, c=1.39, d=1.61.

Compared with prior art, the beneficial effect of the present invention is:

Each formula in the present invention adopts a dimensionless form, which is convenient for application, and essentially reveals the relationship between the cutter head excavation load and various parameters; the method can quickly and accurately determine the cutter head excavation load of the full-face rock roadheader. The calculation results are accurate and reliable because the influence of core factors such as geological parameters, operating parameters and structural parameters on the excavation load of the cutter head is considered comprehensively. Moreover, the tunneling load parameters can be flexibly adjusted at any time according to changes in construction geology and operating conditions, which provides a reliable basis for the design of the power system of the full-face rock tunneling machine and the setting and real-time adjustment of operating parameters during the construction process.

detailed description

The technical solution of the present invention will be further described in detail below in conjunction with specific embodiments, and the described specific embodiments are only for explaining the present invention, and are not intended to limit the present invention.

The design idea of the present invention is: the excavation load of the cutter head (including the thrust of the excavation of the cutter head and the excavation torque of the cutter head) changes proportionally with the uniaxial compressive strength of the rock, and changes with the penetration and the diameter of the cutter head according to a power function. In the present invention, for the driving thrust of the cutter head, the sum of the power exponents of the penetration and the diameter of the cutter head is 2; for the driving torque of the cutter head, the sum of the power exponents of the penetration and the diameter of the cutter head is 3.

A method for determining the excavation load of a full-face rock boring machine cutter head proposed by the present invention includes:

(1) Determine the thrust F of the cutterhead excavation:

F＝0.147CP ^a D ^b

In the formula, F is the thrust of the cutter head, C is the uniaxial compressive strength of the rock, P is the penetration, a=0.0-1.0, D is the diameter of the cutter head, b=1.0-2.0, and a+b=2;

(2) Determine the driving torque T of the cutter head:

T＝8.733μCP ^c D ^d

In the formula: T is the excavation torque of the cutter head, μ is the friction coefficient between the cutter head and the rock, the rolling or sliding friction coefficient is selected according to the main friction form between the cutter head and the rock, C is the uniaxial compressive strength of the rock, P is the degree of penetration, c=0.0-1.5, D is the diameter of the cutter head, d=1.5-3.0, and c+d=3.

The above two formulas are both in dimensionless form, so there is no need to specify the units of each physical quantity. During calculation, the user can set the units of each physical quantity according to actual needs, and the calculation results are consistent.

Experimental material 1: The diameter of the cutter head of a full-face rock boring machine used in a tunnel excavation project is D = 8m. Taking the geological conditions and operating status when the project is excavated to the 21198th pile number as an example, the tunnel excavation project involved The geological parameters are obtained from the geological report of the project, and the uniaxial compressive strength of the rock at pile number 21198 of this project is C=120MPa. The friction between the cutter head and rock is mainly rolling friction, and the rolling friction coefficient between the cutter head and rock is μ = 0.03. The operating parameters involved are all automatically recorded by the equipment, and the penetration of the tunnel excavation project to the 21198th pile number is P=0.0085m. The specific steps for calculating the thrust of the cutter head and the driving torque of the cutter head using the method for determining the driving load of the full-face rock boring machine cutter head proposed by the present invention are as follows:

(1) Calculate the driving thrust of the cutterhead, F=0.147CP ^a D ^b , where the exponent a=0.73, b=1.27; namely:

F＝0.147CP ^0.73 D ^1.27 , substituting each variable (including value and unit) to get:

F＝0.147×(120MPa)×(0.0085m) ^0.73 ×(8m) ^1.27

＝0.147×(120MN·m ^-2 )×(0.0085m) ^0.73 ×(8m) ^1.27 ＝7.619MN

(2) Calculate the driving torque of the cutter head, T=8.733μCP ^c D ^d , where the power exponent c=1.39, c=1.61; namely:

T＝8.733μCP ^1.39 D ^1.61 , substituting each variable (including value and unit) to get:

T＝8.733×0.03×(120MPa)×(0.0085m) ^1.39 ×(8m) ^1.61

＝8.733×0.03×(120MN·m ^-2 )×(0.0085m) ^1.39 ×(8m) ^1.61 ＝1.184MN·m

So far, the excavation load of the cutter head has been calculated when the equipment in this project is driven to the 21198th pile number, and the rest of the pile numbers can be determined in the same way. From this, the cutterhead excavation load of the full-face rock boring machine under different geological conditions and operating states can be calculated throughout the project.

Experimental material 2: The diameter of the cutter head of a full-face rock boring machine used in a certain tunnel excavation project is D = 8m. Taking the geological conditions and operating status when the project is excavated to the 967th stake as an example, the tunnel excavation project involved The geological parameters are obtained from the geological report of the project, and the uniaxial compressive strength of the rock at the 967th stake of the project is C = 25MPa. The friction between the cutter head and rock is mainly sliding friction, and the sliding friction coefficient μ=0.03 between the cutter head and rock. The operating parameters involved are all automatically recorded by the equipment, and the penetration of the tunnel excavation project to the 967th stake is P=0.0102m. When utilizing the method for determining the excavation load of the cutter head of the full-face rock roadheader proposed by the present invention to calculate the thrust of the cutter head and the torque of the cutter head, according to F=0.147CP ^a D ^b , a=0.73 in the formula, b=1.27, c=1.39, d=1.61, after substituting each variable (including value and unit), the excavation load of the cutter head when the equipment is excavated to the 967th stake in the tunnel excavation project is: the thrust of the cutter head F=1.813MN, Disk driving torque T = 2.648MN·m. The remaining stake numbers can be determined in the same way.

The invention provides basic data for the design of the driving and transmission system of the hard rock excavation equipment, and can also provide the basis for setting and real-time adjustment of thrust parameters and torque parameters in the construction process.

Although the present invention has been described above, the present invention is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only illustrative, rather than restrictive. , without departing from the gist of the present invention, many modifications can also be made, and these all belong to the protection of the present invention.

Claims (2)

1. a kind of full face rock tunnel boring machine cutterhead tunnels the determination method of load, it is characterised in that：Including：

Determine cutterhead driving thrust F：

F=0.147CP^aD^b

In formula, F is that cutterhead tunnels thrust, and C is rock uniaxiality strength, and P is pile penetration, and a=0.0~1.0, D is that cutterhead is straight Footpath, b=1.0~2.0, and a+b=2；

Determine that cutterhead tunnels torque T：

T=8.733 μ CP^cD^d

In formula：T is that cutterhead tunnels moment of torsion, and μ is the coefficient of friction between cutterhead and rock, and C is rock uniaxiality strength, and P is Pile penetration, c=0.0~1.5, D is cutter diameter, d=1.5~3.0, and c+d=3.

2. full face rock tunnel boring machine cutterhead tunnels the determination method of load according to claim 1, it is characterised in that：A= 0.73, b=1.27, c=1.39, d=1.61.