CN-122014272-A - Guiding device and method for metro engineering shield measurement

CN122014272ACN 122014272 ACN122014272 ACN 122014272ACN-122014272-A

Abstract

The invention relates to the technical field of shield measurement guiding, in particular to a guiding device and method for subway engineering shield measurement. The method comprises the steps of determining whether a shield tunneling machine enters a composite geological structure of an upper soft soil layer and a lower hard rock layer based on a composite stratum identification index determined by attitude deviation parameters and torque fluctuation characteristics, determining a soft and hard proportion coefficient of the composite geological structure based on the extension length of an interface of the composite geological structure, generating a first guiding adjustment strategy, generating a second guiding adjustment strategy based on fluctuation rate, determining whether a settlement control effect is qualified based on a uniformity characterization value of filling compactness of grouting after tunneling of a tunnel wall of a tunneling region, and optimizing a preset stratum index. The device comprises a total station, a rearview prism, a laser target, a plurality of target prisms, a guiding resolving module, a geological structure judging module, an interface determining module and a guiding adjusting module. The invention improves the guiding precision of the automatic guiding system based on the total station.

Inventors

LI HUA
ZHANG XU
XU JINGTAO
XIE CHUNXU
SHEN XINLEI
Zheng Huihuan
LI LEI
WANG HUI
CAO SHUMIN
WANG XIUSHAN

Assignees

北京城建勘测设计研究院有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260316

Claims (10)

1. A guiding method for subway engineering shield measurement, comprising: Tunneling the shield machine along a design axis according to a guiding result of a guiding device, and acquiring attitude deviation parameters of a front shield and torque fluctuation characteristics of a cutterhead in the tunneling process of the shield machine in real time, wherein the attitude deviation parameters comprise a notch horizontal deviation variable quantity and a notch vertical deviation variable quantity; determining a composite stratum identification index based on the attitude deviation parameter and the torque fluctuation characteristic, so as to judge whether the shield tunneling machine enters a composite geological structure of an upper soft soil layer and a lower hard rock layer based on a comparison result of the composite stratum identification index and a preset stratum index; Responding to the shield tunneling machine entering into a composite geological structure with upper part soft and lower part hard, acquiring a geological radar detection sectional view in a preset range in front of a tunnel face, determining a soft and hard proportionality coefficient of the composite geological structure based on the extension length of an interface of the composite geological structure, and generating a first guiding adjustment strategy for adjusting the thrust difference between an upper oil cylinder and a lower oil cylinder of the shield tunneling machine based on the soft and hard proportionality coefficient; constructing a tunneling specific energy curve of the shield machine based on the first guiding adjustment strategy to generate a second guiding adjustment strategy for correcting the first guiding adjustment strategy based on the fluctuation rate of the tunneling specific energy curve in a preset sliding window; after the tunneling of the preset section is completed, determining whether the sedimentation control effect is qualified or not based on a uniformity characterization value of the filling compactness of grouting after the tunnel wall of the tunneling area, and optimizing the preset stratum index based on the disqualification condition.
2. The guidance method for subway engineering shield measurement according to claim 1, wherein the composite stratum identification index refers to a weighted sum of a slit horizontal deviation variation quantum index, a slit vertical deviation variation quantum index, and a torque fluctuation amplitude matching sub index.
3. The guidance method for subway engineering shield measurement according to claim 2, wherein the process of determining whether the shield machine enters the composite geological structure of the upper soft soil layer and the lower hard rock layer based on the composite stratum identification index comprises: Comparing the composite stratum identification index with a preset stratum index; And judging that the shield machine enters the composite geological structure based on the comparison result that the composite stratum identification index is larger than the preset stratum index.
4. A guidance method for subway engineering shield measurement according to claim 3 wherein the process of determining the interface of the composite geological structure based on the geological radar detection profile under the condition that the shield machine enters the composite geological structure with soft top and hard bottom comprises: equally dividing the geological radar detection sectional view into a plurality of horizontal strips along the depth direction, and determining the average value of reflection amplitudes of the individual horizontal strips; Sequentially calculating the amplitude difference value of the reflection amplitude average value of two adjacent horizontal strips from top to bottom by taking the first horizontal strip with the surface down as a reference; And determining a horizontal band with the amplitude difference exceeding a preset amplitude for the first time as an interface of the composite geological structure.
5. The guidance method for shield measurement of subway engineering according to claim 4, wherein the process of determining the soft and hard scaling factor of the composite geological structure based on the extension length of the interface comprises: establishing a section coordinate system by taking the center of a shield machine incision as an origin, dividing the circular incision section of the shield machine by adopting a horizontal line corresponding to the burial depth of the interface, and taking the area of the lower area of the divided circular incision section as the area of a hard rock stratum; Determining the ratio of the area of the hard rock stratum to the total area of the cross section of the circular notch as a basic soft-hard proportionality coefficient; Acquiring the extension length of the interface along the tunneling direction, and determining the length ratio of the extension length to the preset length as an extension length weight coefficient; And determining the product of the extension length weight coefficient and the basic soft and hard proportionality coefficient as a soft and hard proportionality coefficient.
6. The guidance method for subway engineering shield measurement according to claim 5, wherein the process of generating the first guidance adjustment strategy based on the soft-hard scaling factor comprises: comparing the soft and hard proportional coefficients with preset proportional coefficients respectively; and determining a thrust difference adjusting coefficient of the thrust difference between the upper oil cylinder and the lower oil cylinder of the shield tunneling machine based on the comparison result of the soft and hard proportional coefficient and the preset proportional coefficient.
7. The guidance method for subway engineering shield measurement according to claim 6, wherein the process of generating a second guidance adjustment strategy for correcting the first guidance adjustment strategy based on the fluctuation rate of the tunneling specific energy curve within a preset sliding window comprises: Determining the percentage of the average value and the standard deviation of the tunneling specific energy in a preset sliding window as the fluctuation rate of the tunneling specific energy based on the tunneling specific energy curve; Comparing the fluctuation rates with preset fluctuation rates respectively; and generating a second guiding adjustment strategy for correcting the first guiding adjustment strategy based on a comparison result of the fluctuation rate and a preset fluctuation rate.
8. The guidance method for subway engineering shield measurement according to claim 7, wherein determining whether the sedimentation control effect is acceptable based on the uniformity characterization value comprises: Comparing the uniformity characterization value with a preset characterization value; And determining that the sedimentation control effect is unqualified based on the comparison result that the uniformity characterization value is larger than the preset characterization value.
9. The guidance method for subway engineering shield measurement according to claim 8, wherein the process of optimizing the preset stratum index under the condition that the sedimentation control effect is not qualified comprises: the uniformity characterization value and the preset characterization value are subjected to difference so as to obtain a characterization difference value; And setting a plurality of index optimization coefficients to optimize the preset stratum index based on a comparison result of the characterization difference value and a preset characterization difference value.
10. A guiding device for subway engineering shield measurement, applying the guiding method for subway engineering shield measurement according to any one of claims 1 to 9, comprising: the total station is arranged on the measuring bracket on the side wall of the tunnel segment and used for measuring the three-dimensional coordinates of the target point; The rearview prism is arranged on the tunnel duct piece and is used for providing an azimuth reference for the total station; the laser target is arranged in the front shield of the shield machine and is used for receiving the laser beam emitted by the total station; the target prisms are arranged in the front shield of the shield machine and are used for providing observation targets for the total station; The guiding resolving module is used for resolving the attitude deviation parameters of the front shield and the torque fluctuation characteristics of the cutterhead in the tunneling process of the shield machine in real time; The geological structure judging module is used for judging whether the shield tunneling machine enters a composite geological structure of an upper soft soil layer and a lower hard rock layer or not based on a comparison result of the composite stratum identification index determined by the attitude deviation parameter and the torque fluctuation characteristic and a preset stratum index, determining whether a settlement control effect is qualified based on a uniformity characterization value of filling compactness of grouting after tunneling a tunnel wall of a region, and optimizing the preset stratum index based on a failure condition; The interface determining module is used for determining an interface of the composite geological structure based on a geological radar detection section and determining a soft-hard proportionality coefficient of the composite geological structure based on the extension length of the interface in response to the shield tunneling machine entering the composite geological structure with soft top and hard bottom; The guiding adjustment module is used for generating a first guiding adjustment strategy for adjusting the thrust difference between the upper oil cylinder and the lower oil cylinder of the shield machine based on the soft and hard proportionality coefficient and generating a second guiding adjustment strategy for correcting the first guiding adjustment strategy based on the fluctuation rate of the tunneling specific energy curve of the shield machine in a preset sliding window.

Description

Guiding device and method for metro engineering shield measurement Technical Field The invention relates to the technical field of shield measurement guiding, in particular to a guiding device and method for subway engineering shield measurement. Background In the subway tunnel shield construction, an upper soft lower hard composite geological structure is a typical complex bad stratum, and extremely high requirements are provided for shield tunneling posture and guiding control. At present, the main stream shield automatic guiding system mostly uses a total station as core measuring equipment, and cooperates with an onboard target and a prism to realize space positioning and attitude resolving of a shield machine, so that the basic guiding requirement can be met in a homogeneous stratum. When tunneling is performed on an upper soft stratum and a lower hard stratum, asymmetric counter force generated by a lower hard rock on a cutter head is easy to cause severe mutation of pitching, rolling and axial displacement of a shield machine, stable constraint cannot be provided for an upper weak stratum, gesture fluctuation is further aggravated, the dynamic gesture mutation is easy to cause poor viewing conditions among a total station, an onboard target and a prism, and measurement data are intermittent or deviated, meanwhile, the gesture calculation and deviation correction response speed of a traditional guide system is difficult to match with rapid gesture change caused by geological mutation, so that the guide precision is reduced, deviation correction is lagged, continuous stable automatic guide cannot be realized, engineering risks such as tunnel axial overrun and uneven subsidence of the earth surface are easily caused, and the actual requirement of subway shield high-precision automatic guide under complex geological conditions is difficult to adapt. CN103471569a discloses a target and system for automatic guiding and measuring of shield, the target is a target prism which is arranged in the shield machine and can move along a fixed linear coordinate, the spatial relationship between the linear coordinate and the axis of the shield machine is known, and the target prism can stay at any position on the straight line. The system comprises the target and a total station with an automatic identification function, wherein the total station is arranged behind the shield tunneling machine. The invention enables the target prism to move along the linear orbit and stay at different positions in sequence, the prism at each different position is observed by the total station to obtain the space position information of a plurality of different stay points, and meanwhile, the rolling angle and the pitch angle are measured by means of the biaxial inclinometer INCL and transmitted back to the system. The invention is suitable for tunnel shield construction under various conditions, can greatly reduce or even eliminate the influence of the angle measurement error of the total station on the precision of the measurement result, and has self-checking and correction capability. The existing automatic shield guiding system based on the total station has the problems that in an upper soft and lower hard composite stratum, the condition of the open is easily deteriorated, the measurement precision is reduced, the gesture calculation and the deviation correction response are delayed due to severe abrupt change of the gesture of the shield, and continuous, stable and high-precision automatic guiding cannot be realized. Disclosure of Invention Therefore, the invention provides a guiding device and a guiding method for metro engineering shield measurement, which are used for solving the problems that in the prior art, a shield automatic guiding system based on a total station is easy to cause poor viewing conditions, reduced measuring precision, retarded gesture resolving and deviation correcting response due to severe abrupt changes of the gesture of a shield in an upper soft layer and a lower hard layer, so that the guiding precision is low. In order to achieve the above object, in one aspect, the present invention provides a guiding method for metro engineering shield measurement, which is characterized by comprising: Tunneling the shield machine along a design axis according to a guiding result of a guiding device, and acquiring attitude deviation parameters of a front shield and torque fluctuation characteristics of a cutterhead in the tunneling process of the shield machine in real time, wherein the attitude deviation parameters comprise a notch horizontal deviation variable quantity and a notch vertical deviation variable quantity; determining a composite stratum identification index based on the attitude deviation parameter and the torque fluctuation characteristic, so as to judge whether the shield tunneling machine enters a composite geological structure of an upper soft soil layer and a lower hard rock layer based on a