An axisymmetric tunnel roadway non-uniform deformation characterization method based on a virtual mass center transfer vector

Abstract

The invention discloses an axisymmetric tunnel roadway non-uniform deformation characterization method based on a virtual mass center transfer vector, relates to the technical field of geotechnical engineering, and aims to solve the problem of non-uniform deformation characterization of an axisymmetric tunnel roadway. The method comprises the following three steps: installing an anchor cable as a reference object of a positioning coordinate system, erecting a laser profiler at a certain distance and a certain time along the tunnel roadway, recording space coordinates of the laser profiler, and measuring an envelope diagram of the excavation contour line of the tunnel roadway; calculating the centroid positions of the tunnel excavation contour line envelope diagrams of different measuring points at different times, and further obtaining virtual centroid transfer vectors of the same measuring point at different times; representing the main trend of the tunnel roadway non-uniform deformation by using the direction of the virtual centroid transfer vector, and representing the relative intensity of the tunnel roadway non-uniform deformation by using the scalar of the virtual centroid transfer vector; the invention has the advantages that the spatial distribution information of tunnel surface convergence can be fully described, the measurement accuracy is high, and the manual error is small.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to an asymmetric deformation characterization method of an axisymmetric tunnel roadway based on a virtual centroid transfer vector. Background technique [0002] Rectangular, arched, circular and elliptical axisymmetric sections are common in the field of tunnels and underground engineering, but due to factors such as uneven distribution of ground stress, rock structures such as fold faults and karst caves, unequal strong support structures, engineering disturbances, etc. Affected by the impact of the axisymmetric tunnel roadway, non-uniform deformation often occurs, which in turn leads to systematic instability and failure of the surrounding rock of the tunnel roadway. [0003] At present, the characterization of the non-symmetric deformation of tunnels mainly adopts statistical methods, such as box plots composed of maximum value, upper quartile, median, lower qua...

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Problems solved by technology

[0002] Rectangular, arched, circular and elliptical axisymmetric sections are common in the field of tunnels and underground engineering, but due to factors such as uneven distribution of ground stress, rock structures such as fold faults and karst caves, unequal strong support structures, engineering disturbances, etc. Influenced by the impact of the axisymmetric tunnel roadway, non-uniform deformation often occurs, which in turn leads to systematic instability and failure of the surrounding rock of the tunnel roadway.

[0003] At present, the characterization of the non-symmetric deformation of tunnels mainly adopts statistical methods, such as box plots composed of maximum value, upper quartile, median, lower quartile, minimum value and average value. It can describe the distribution of surface deformation of a section, but it is separated from the engineering site, and only statistical methods cannot fully characterize the spatial distribution information of tunnel surface convergence

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