CN102147826A - Method for calculating optimal driving speed of tunneling machine under different geologies - Google Patents

Abstract

The invention provides a method for calculating the optimal tunneling speed of a tunneling machine under different geologies. The tunneling efficiency is an optimized target, so scientific data is provided for selecting parameters of the tunneling speed during construction. The method for calculating the optimal tunneling speed of the tunneling machine under different geologies comprises the following steps of: (1) determining an undetermined coefficient in a thrust calculation model; (2) determining an undetermined coefficient in a torque calculation model; (3) determining a specific energy expression corresponding to a target project based on expressions of a thrust and a torque; and (4) calculating a range of the tunneling speed through a specific energy function and determining the optimal tunneling speed under a selected geologic condition. By the method, the optimal values of the tunneling speeds corresponding to different geologic conditions can be determined quickly, so that the speed parameter can be always kept in the range highly matched with the geologic conditions, the scientificity of speed parameter selection during tunnel construction is enhanced and the construction efficiency of the tunneling machine is improved effectively.

Description

The computing method of rock tunnel(ling) machine optimum driving speed under different geology

Technical field

The invention belongs to the tunnel machine operating technique, be specifically related to the computing method of a kind of rock tunnel(ling) machine optimum driving speed when under different geologic conditions, working.

Background technology

In recent years, along with the fast development of China's City Underground Transportation, Tunnel Engineering projects such as railway, conveying pipe increase severely, and wherein efficient and the energy consumption of rock tunnel(ling) machine in work progress becomes one of Tunnel Engineering field common concern problem.The driving usefulness of rock tunnel(ling) machine in work progress is relevant with numerous factors, as driving load, driving speed and geologic condition etc.When development machine was worked under different geologic conditions, adjusting driving speed will directly influence driving usefulness.Therefore, if can adjust operating parameter it is maintained in the scope with this geologic condition matched, then the work efficiency of development machine will increase substantially.Yet, in present constructing tunnel, still mainly rely on driver's operating experience to set and adjust driving speed, the speed data that lacks science is to keep efficient driving.

Given this, it is optimization aim that the present invention proposes with driving usefulness, obtains the computing method of optimum driving speed under different geologic conditions, provides scientific basis for improving constructing tunnel efficient.

Summary of the invention

The objective of the invention is, proposing a kind of is optimization aim with driving usefulness, and the computing method of optimum driving speed when rock tunnel(ling) machine is worked under different geologic conditions are the selected science data that provide of driving speed parameter in the construction.

The object of the present invention is achieved like this: rock tunnel(ling) machine is kept the computing method of the driving speed of efficient construction, mainly is divided into following step:

(1) determines undetermined coefficient in the thrust computation model;

(2) determine undetermined coefficient in the torque arithmetic model;

(3) determine the specific energy expression formula of target engineering correspondence based on the expression formula of thrust and moment of torsion;

(4), determine the optimum driving speed under the selected geologic condition by specific energy function calculation driving speed scope.

Thrust computation model in the wherein said step (1) is meant F=A _FW δ ²+ (B _FW+C _FP) D ²,

In the formula, F (kN) drives thrust for development machine; W (kPa) is by the ground bearing capacity of the excavation soil body; δ (m/r) characterizes driving speed, refers to the degree of depth that cutterhead whenever rotates a circle and cut; P (kPa) is a native storehouse pressure; D (m) is a cutter diameter; A _F, B _F, C _FDimensionless undetermined coefficient for the thrust computation model, need determine at specific target engineering, concrete grammar is on the basis of the load parameter of known target engineering, operating parameter, structural parameters and geologic parameter, utilize least square method to carry out match at above-mentioned model, just can determine the value of above-mentioned dimensionless group corresponding to this target engineering.

Torque arithmetic model in the wherein said step (2) is meant T=A _TW δ ³+ (B _TW+C _TP) D ³, in the formula, T (kNm) is the development machine driving torque; A _T, B _T, C _TBe the dimensionless undetermined coefficient of torque arithmetic model, need determine that computing method are identical with thrust in the step (1) at specific target engineering.

Wherein said step (3) refers to thrust and the following specific energy expression formula of torque arithmetic model substitution at the target engineering that step (1), (2) are obtained

$E_s=\frac{2\mathrm{\πT}+\mathrm{F\δ}}{0.25\mathrm{\π}{D}^2\mathrm{\δ}}$

In the formula, E _s(kJ/m ³) be the driving specific energy of development machine, be the index that characterizes the development machine task performance, refer to that specifically development machine whenever finishes the energy that driving consumed of the unit volume soil body.Specific energy is low more, shows that then drivage efficiency is high more.

Wherein said step (4) will be determined geologic parameter and structural parameters according to actual engineering, comprising: the ground bearing capacity W that is excavated the soil body, soil storehouse pressure P, and development machine cutter diameter D, with described parameter substitution step (3), obtain the specific energy function, according to selected driving speed scope, calculate each specific energy values of driving speed δ correspondence from 0.015m/r to 0.1m/r change procedure, the pairing driving speed value of wherein minimum specific energy values is an optimal value.

The beneficial effect of characteristics of the present invention and generation is, can determine the pairing driving speed optimal value of different geologic conditions fast, speed parameter is maintained in the scope with the geologic condition matched all the time, increase the science of constructing tunnel medium velocity selection of parameter, thereby effectively improved the development machine operating efficiency.

Embodiment

Below by specific embodiment computation process of the present invention is further described, need to prove that present embodiment is narrative, does not limit protection scope of the present invention with this.Present embodiment is in conjunction with somewhere ironworker's journey work progress, development machine cutter diameter D=6.34m.

The first step is determined the undetermined coefficient in the thrust computation model

At thrust data, ground bearing capacity data, driving speed data, native storehouse pressure data and the cutter diameter data (as shown in table 1) that the target engineering is provided, utilize least square method to carry out match and obtain: A _F, B _F, C _FOccurrence, by

F＝A _FWδ ²+(B _FW+C _FP)D ²，

Obtain F=1.8 * 10 ⁴W δ ²+ (1.2W+0.79P) D ²

Second step was determined the undetermined coefficient in the torque arithmetic model

At moment of torsion data, ground bearing capacity data, driving speed data, native storehouse pressure data and the cutter diameter data that the target engineering is provided, utilize least square method to carry out match and obtain: A _T, B _T, C _TOccurrence is by T=A _TW δ ³+ (B _TW+C _TP) D ³,

Obtain T=2.4 * 10 ⁴W δ ³+ (7.8 * 10 ^-4W+1.9 * 10 ^-2P) D ³

The 3rd step was determined the specific energy expression formula of target engineering correspondence based on the expression formula of thrust and moment of torsion

Thrust and torque arithmetic substitution specific energy as a result expression formula with step (1) and step (2) obtain obtain

$E_s=\frac{2\mathrm{\πT}+\mathrm{F\δ}}{0.25\mathrm{\π}{D}^2\mathrm{\δ}}=(2.1\×{10}^5{\mathrm{WD}}^{-2})\×{\mathrm{\δ}}^2+(0.15\mathrm{PD}+6.2\×{10}^{-3}\mathrm{WD})\×{\mathrm{\δ}}^{-1}+(1.5W+P)$

The 4th step was determined the optimum driving speed under the selected geologic condition by specific energy function calculation driving speed scope

The geology that this project is mainly passed through is silt clay, silty clay, and silt and flour sand are example with the silt clay, according to selected silt clay geologic parameter, its ground bearing capacity W=80kPa; Soil storehouse pressure P=236.4kPa; Development machine cutter diameter D=6.34m in parameter substitution step (3), obtains the specific energy function,

E _s＝(4.2×10 ⁵)×δ ²+(2.3×10 ²)×δ ^-1+36×10 ²

Calculate each specific energy values (as table 2) of driving speed δ correspondence from 0.015m/r to 0.1m/r (the rational driving speed scope of development machine) change procedure.For present embodiment, when development machine when driving speed reaches 0.065m/r in silt clay, specific energy reaches minimum 5629.7kJ/m ³, this moment, drivage efficiency was the highest, was the efficiency optimization driving speed under this geologic condition.

So far, the efficiency optimization driving speed of this project under the silt clay geologic condition determines that the pairing optimum driving speed of all the other each geologic conditions also can obtain by identical method.Proposition of the present invention is set with adjustment for the driving speed in the constructing tunnel process important reference frame is provided, for the construction that realizes the low energy consumption of development machine high-level efficiency lays the foundation.

Table 1-target engineering data list

Table 2-is at target engineering driving speed and specific energy table of comparisons under the silt clay geologic condition

Claims (1)

1. the computing method of rock tunnel(ling) machine optimum driving speed under different geology is characterized in that calculating and are divided into following step:

(1) determines undetermined coefficient in the thrust computation model

Development machine drives thrust F=A _FW δ ²+ (B _FW+C _FP) D ²,

In the formula, F (kN) drives thrust for development machine; W (kPa) is by the ground bearing capacity of the excavation soil body; δ (m/r) characterizes driving speed, is meant the degree of depth that cutterhead whenever rotates a circle and cut; P (kPa) is a native storehouse pressure; D (m) is a cutter diameter; A _F, B _F, C _FDimensionless undetermined coefficient for the thrust computation model;

(2) determine undetermined coefficient in the torque arithmetic model

Development machine driving torque T=A _TW δ ³+ (B _TW+C _TP) D ³,

In the formula, T (kNm) is the development machine driving torque; A _T, B _T, C _TBe the dimensionless undetermined coefficient of torque arithmetic model, other parameter-definition is identical with step (1);

(3) determine the specific energy expression formula of target engineering correspondence based on the expression formula of thrust and moment of torsion

Thrust and torque arithmetic model substitution following formula with step (1) and step (2) obtain obtain the specific energy expression formula,

$E_s=\frac{2\mathrm{\πT}+\mathrm{F\δ}}{0.25\mathrm{\π}{D}^2\mathrm{\δ}}$

In the formula, E _s(kJ/m ³) be the driving specific energy of development machine, refer to that specifically development machine whenever finishes the energy that driving consumed of the unit volume soil body;

(4), determine the optimum driving speed under the selected geologic condition by specific energy function calculation driving speed scope

Determine geologic parameter and structural parameters according to actual engineering, comprising: the ground bearing capacity W that is excavated the soil body, soil storehouse pressure P, and development machine cutter diameter D, with described parameter substitution step (3), obtain the specific energy function, according to selected driving speed scope, calculate each specific energy values of driving speed δ correspondence from 0.015m/r to 0.1m/r change procedure, the pairing driving speed value of wherein minimum specific energy values is an optimal value.